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Buying options eBook EUR Softcover Book EUR These things mean good shielding and proper choice of circuit constants. Before we tried the thing we anticipated that the change in plate resistance of the r. If detuning exists it can be traced to remediable causes. Most of them are far from being stable-enough oscillators.

The slightest change in plate voltage will cause the beat note on a received signal to wobble around, a thing which has driven a lot of amateurs to using "B II batteries for plate supply. And when an a. Unfortunately no oscillator working right on the ragged edge of oscillation, as a regenerative detector does, can be wholly stable, but a lot can be done about it.

And the most effective thing to do is a stunt we have been using for years in our transmitters - put some capacity in the tuned circuit. A detector circuit with the largest possible coil and the smallest possible condenser may give the greatest sensitivity, but then the frequency of oscillation is also extremely sensitive to small changes in plate voltage - to say nothing of its penchant for hloeking or spreading out on any INSIDE THE SHIEWS Detector.

The audio tube sits behind the drum dial in the rear left-hand corner of the chassis. This photo shows the method of gunging the midget tuning condensers. All the trick circuits we have tried, including the so-called separate regenerator tube, have failed to do a thing about this, but a little dose of our old friend high-c helps amazingly. Maybe there would be fewer plaints in our "Correspondence" columns about rotten signals if more of us had receivers that would do justice to the many really good ones on the air.

So far we have largely been talking generalities, but it should be evident hy this time that in our opinion the autodyne c. It should have a tuned r. Its circuit diagram will look pretty much the same as that January,. The real difference will be in its performance. Although five controls have been brought out to the panel, the set is in reality a single-control-tuning affair.

The two upper knobs provided with pointers are band--setting condensers; they are set when coils are changed and need not be touched after that. In the lower righthand corner is the r. The sides were bent down with an ordinary small-size bench vise, first being scribed on the under side along the bending line and then worked down to position a little at a time.

The panel constitutes the front of both boxes. The pieces making up the sides of the boxes are fastened R. Similar rods are also used for fastening the boxes to the Heav:, lines indicate grounds which should be made at one point. Heaters not shown are wired in parallel. Type 39 and 37 tubes may be substituted for the SB's and 56 shown with no chanke in the circuit diagram.

Resistors R, and R, may be omitted if batteries are to be used as plate supply. See text. R,-5 megohms, R, ohms, 2 watt. Ra,ohm wire-wound potentiometer, tapered Yaxley.. R, - 50, ohms, 2 watt. R,- 14, ohms, wire-wound, 5 watt. R ohms, wire-wound, 5 watt, R, - I00, ohms, 1 watt. Ra-1 megohm. R, ohms, 1 watt. R,o- 50,ohm potentiometer.

AllJrimaries L, and L, are wound with No. The and 14,,kc. Taps are from the ground end of detector coils. To get a fairly high-c circuit for the detector, the parallel-condenser method of band-spreading is used. This, as most of us know, consists of using a fairly large constant capacity in parallel with a small variable capacity.

The degree of band spreading will depend upon the ratio of the two capacities and the size of the inductance used for a particular band. The circuit diagram is given in Fig. Although working in aluminum may look difficult to the ham with an ordinary cellar workshop, it requires more care and patience than it does skill.

All the work on this receiverwasdonewith nothing but a hack saw, a bench vise, an ordinary hand drill, a file, a ten-cent kitchen knife, and a few taps. Hammarlund midgets, mounted on the eft.. This type of condenser is readily adaptable to ganging because the shaft projects about a quarter-inch beyond the rear bearing. The condensers should be lined up carefully so the shafts and the center of the drum dial are on the same line, to avoid twisting when the dial is turned.

To get a flexible coupling on the rear of the first condenser it is necessary to take off the small spring contacts that wipe on the shaft by 14 QST for. When this is done it is necessary to make the contact to the rotor plates through the front bearing on the condenser. The rear bearing does not fit tightly enough to make good contact and the condenser will be noisy if an attempt is made to use it.

Leave the rear bearing unconnected. A metal rod could be used just as well. The dial is also connected to the first condenser through the medium of a. When lined up properly the whole assembly turns with surprising ease. The coil sockets and the tube sockets as well are of Isolantite. These sockets are used not particularly because of any electrical advantages but because they are mechanically rigid and will stand the strain of changing coils without getting bent out of shape.

The coil sockets are mounted on small pillars of 1,4-inch metal tubing, just long enough to allow the contacts under the sockets to clear the base. The grid condenser and leak for the detector stage are held from the base by a small metal pillar and are just behind the coil in the detector compartment.

Another photograph shows how the parts are placed under the chassis. For example, there is only one common ground connection for r. Resistors and audio condensers are mounted wherever it is most convenient to put them, especially if the pigtails provided on them can be used. The audio choke, a small audio transformer made for broadcast replacement purposes, is mounted on the edge of the chassis at the right.

Its primary and secondary are connected in series. This particular transformer has a rather definite peak in the vicinity of cycles and, as a result, contributes a little audio selectivity to the set. There is little more to be said about the mechanical arrangement of the set.

The tuning dial is placed on the left because it is convenient to be able to tune the receiver without getting in the way of copy paper and log books and leave the right hand of the operator free. If you're lefthanded, modify the layout to put the dial on the right-hand side.

The regeneration control knob is near the tuning knob so both can be worked with one hand conveniently, although not simultaneously. Don't try lo build a shield for the r. A common partition, instead of acting as a shield, actually will couple the two circuits together. As a result the r. This is not t,heory; we tried it that way first. Separate boxes, as shown in the photograph, not only stopped the oscillation but also took out practically all tendency toward interlocking of tuning in the two stages on all but the highest frequencies.

As has been mentioned before, all the r. Not only that, all parts of the r. No dependence should be placed on contacts to aluminum for r. The circuit used for the detector differs a little in this receiver from the ordinary tickler circuit. It was used because we felt it desirable to use 5- prong coil forms, and in order to use magnetic coupling between the r. The circuit is a January,. It somewhat resembles the electron-coupled oscillator - several suggestions for this type of circuit have been received from different amateurs and are described in the Experimenters' Section in this issue - but so far as can be told from ordinary observation its performance is not greatly different from the ordinary regenerative circuit.

It, is used here largely as a matter of convenience. If 6-prong coil forms are available, the use of the regular tickler circuit is recommended, because then condenser regeneration control, which has much less tuning effect, than screen-grid voltage control, can be used. Condenser control does not work with this circuit because the plate and screen are in parallel for r. More spread can be obtained by using a smaller tuning condenser.

Personally we do not care for the larger spread for a receiver with ordinary selectivity because cranking a highratio vernier dial over its whole scale to cover a band is a rather lengthy and laborious operation. This is a matter of individual preference, however. Changing to the smaller tuning condensers will not affect the sizes of the coils nor make any changes in the other circuit values.

The Hartley circuit in the detector is a facile oscillator; so much so that the "tickler" -we might call that part of the coil between ground and the cathode tap the tickler is matter of fractions of turns on the high-frequency bands. The right place for the tap has to be hunted out if the detector is to be controllable with a reasonable value of screen voltage. In this particular set the tap is three turns from ground on 1. The taps are made by boring a small hole in the form alongside the point where the tap is to be placed, running a wire through t.

All the coils should be "doped" with collodion or a similar mateiial. The and 3. A fairly even job can be made when the coil has a dozen or less turns. With coils of the sizes specified, the amateur 16 bands will be located with the padding or bandspreading condensers set near maximum on the 7- and mc. There will be no need for cut and try if the coil specifications are followed; this band-spread system is an easy one to get into operation because slight variations in coils can be compensated for by the condenser settings.

Once the right settings of the padding condensers have been determined for all bands appropriate marks can be put on the panel or small paper or metal scales can be made up and calibrated. Setting the padding condensers is not by any means a hair-line adjustment lllless it is necessary to have exactly the same dial readings every time one returns to a band. This is a receiver, however, not a frequency meter.

Antenna windings on the r. The primaries for the detector coils are not critical as to number of turns;. Primaries are closewound at the bottoms of the coil forms, grid coils at the top. Strictly speaking, the r. Actually, however, it controls volume nicely even though complete cut-off is not obtainable.

The purpose of the resistor R4 in Fig. With R. The total bias with all of Rs included in the circuit is in the neighborhood of 50 volts. A voltage divider consisting of a pair of small re. The filaments of the tubes are wired in parallel and are brought out to the power supply through another pair of leads, making only a 4-wire cable necessary.

The centertapped resistor across the filament supply should be included in the power pack. This arrangement, which is used by National in their a. If batteries are to be used for plate supply, resistors R, and R6 can be omitted and a separate lead brought out for the regeneration control.

There should be a switch in the negative battery lead to cut off the current drained through R 4 and R,o when the set is not in operation. The field, wherever a. The t'eceiver, lying on its side, can be. A separate receiver and 'phones are used at home, so to prepare for a trip it is only necessary to pull the volt plug on the portable, unclip the feeders, put it in the box and he away.

There seems to be a necessity for having a circuit to start wit. The shielding has the added advantage of keeping dust out of at least part of the set. The photograph shows how the transmitter looks when ready for a trip. The whole outfit, including the a. But the idea of tying up a lot of good parts for occasional use seemed too much for Scotch instincts; on the other hand, cheap, junky parts were out of the question because the set had to be capable of standing up on auto trips of great length.

It was therefore decided to design and build t,he set so it could be used both for portable work and as the regular set at W6CUG for the rest of the time. This was accomplished by making the portable an m. There was no necessity for building the set in a box of hand-baggage size because the car would he available for any trips taken, so effort was bent toward making the portoscillator tank condenser.

The small knob just below the middle dial is the neutralizing condenser, which has a 3-inch fibre extension shaft to eliminate body capacity when neutralizing. The switch at the bottom controls the primary of the power transformer. The meters, from right to left, are the oscillator plate milliammeter, fila ment voltmeter and amplifier plate milliammeter.

Two small knobs in the lower corners assist in getting the set in and out of the case. The base, on which the power supply is mounted, is 14 by 9 inches and is covered with sheet zinc 1. This is shown in the rear view.

The power transformer, a Thordarson T, is on the left. Beside it is a Silver Marshall Unichoke, on which is mounted a 50, ohm bleeder. On the right is a bank of six WEAA condensers, and between them and the panel is the 10, ohm resistor which drops the plate voltage for the oscillator. The filter condensers are held to the base by a strip of steel 3 inches wide and bent so that when the six screws through it are tightened, the tension on the condensers pulls them to the baseboard.

The 5-pole double-throw switch, the socket for the volt line, the two sockets for the 'Sl's and the binding posts for the "C" bias and key are all mounted on the base. For the benefit of anyone duplicating the set, I would suggest adding a few inches more to allow making the two small volt "C" batteries a part of the unit and adding a separate filament transformer so the amplifier alone could be keyed in the center tap.

The present arrangement has proved very satisfactory, however. The rear central portion is cut away to clear the tops of the '81's. Care must he used in forming the zinc because it cracks easily. Soldering also must he carefully done, since a slight excess of heat may melt a patch out of the can, but its clean-out appear- January,. The objection to aluminum, of course, is that it cannot be soldered. Cardwell condensers are used throughout for tuning.

Small angle brackets support fixed condensers and other smali parts, which are fitted in wherever space is available. The small r. The filament by-pass condensers are mounted directly at the sockets. The neutralizing condenser is mounted on a small piece of bakelite which in turn is fastened to the base by a brass angle. The amplifier socket is mounted on a small bakelite shelf which is fastened to the back of the tuning condenser by an angle bracket. The centertap of the filament by-pass condensers is a strip of brass which also acts as a support for the rear end of the shelf which holds the socket.

A small tumble switch in the amplifier highvoltage lead allows the amplifier voltage to be cut off for neutralizing. This switch is mounted on the shelf at the rear of the amplifier tank condenser, insulated, of course, from the zinc. The coils, described in Fig. The coupling type is used, filed flat to fit the IJ,ngle brackets on the condenser and screwed in place.

The antenna condenser is mounted on two General Radio stand-off insulators by two pieces of brass bent in the shape of an "L. A binding post is fastened to one of these 18 brass pieces for the antenna lead in. The antenna condenser extension shaft is also fibre, the hole in the panel through which it passes acting as a guide to keep it from wobbling. Since it is close to the amplifier coil, it should not be of metal.

One end of the antenna inductance is mounted on a stand-off insulator; the other end is flattened and screwed directly to the condenser. All leads through the shelf run through rubber grommets eyelets. A knot in each lead jubt above the shelf prevents its being pulled loose by an accidental yank. All d. The fixture cord is skinned, scraped, and an eyelet crimped in place. The end is then dipped in solder. This keeps loose strands from getting too familiar with the zinc shields.

In the event that the set is to be shipped by rail there are two hex-head cap-screws that hold it in place. It is visible on the door of the case in the front-view photograph, and consists of a bakelite tube two inches in diameter on which QST for. The coil has three turns of No. By experiment the thing was adjusted to kc. A final check is taken with the monitor.

More of that later. For insulation there is a pair of 3-inch Pyrex strain insulators each fitted with a small loop of flexible antenna wire put through the eye of the insulator and through the hole in the end of a male compression fitting and soldered. The feeder is a quarter wavelength long.

Another wire the same length as the feeder makes possible the use of either the Hertz or the antennacounterpoise system. The advantage of this is that if a goes west, just disconnect the amplifier feeder clip and hook the Hertz to the oscillator tank and R, you are all set for lowpower high-c operation. Those below the line are in the d: 'namotor housing. Ct, C,- l! R, - 10, ohma. RFC - Three sections of 50 turns No.

Values of Power supply components are shown on the diagram,.. The method of carrying it will be seen in the photo. It is merely a metal clip that slides into a compartment in front of the monitor. There is also room on top of the monitor for the pair of W. The field strength meter has stood many trips without a sign of an injury, and is used more than any other piece of apparatus in the tuning of the set.

It fits back of the field strength meter and is not visible in the photograph. On the shelf above is the 1'. Marshall midget is shunted across it to enable the thing to go l,o kc. A dummy phone plug with a ohm resistance across it is plugged into the monitor when spatting the frequency in the receiver. The resistor is used to approximate the resistance of the phones.

These machines are Signal Corps units, 10 volts input and volts output, and are wired to operate either both in series or one singly. They are mounted in such a way as to be solid in transportation, and since they are carried on the running board of the car must also be protected from dust and rain.

The photograph shows the method of mounting. The individual pieces are welded together and squared up with a file. A piece of one-inch angle iron 7 inches long is bolted to the sides at the bottom to act as a means of fastening the unit to the running board of the car and also as a spacer to hold the sides to width.

The ends are bakelite paneling fastened to the sides by machine screws. A Type '99 tube is used in an ordinary regenerative circuit. A 5-plate Hammarlund midget is used for tuning and a plate Silverbinding posts for battery connections to the dyna. The plate switch, filter chokes, filter condensers, and output binding posts are mounted on the opposite end.

The problem of holding the dynamotors rigidly was solved by mounting them in the two aluminum castings shown in the photograph. They were then bored out to the diameter of the dynamotors after removing the band that covers the brushes. The blocks are then sawed through the holes to allow the generators to enter, the stud nuts tightened and the whole fastened to the angle iron frame with steel machine screws. Care must be exercised to keep the units square so they will set level and present a workmanlike appearance.

The important thing is to square the sides before welding and see to it, that the welder doesn't warp them out of shape. The whole unit is covered with a piece of galvanized iron that is in turn given a good priming and three coats of lacquer. It is fastened to the sides and top by machine screws and is readily removable for oiling, etc. It will interest some fellows that live near either coast to know that many of t,he essentials of the portable can be obtained from obsolete army and navy equipment available at various ship and marine junk yards.

The filter system, switches, dynamotors and paneling in this job came from there. The present receiver was evolved in the attempt to get the smallest, most rigid and foolproof receiver. Front and rear view of this unit are shown in accompanying photographs.

The wiring diagram is given in Fig. The base is made of gauge aluminum, six inches long and just high enough to take a pair of t,he old Thordarson b. The Cardwell taper-plate condensers are mounted vertically, using the panel spacers for legs.

A piece of brass 2? The front-view photograph shows clearly the location of the detector Bradley- L, stat, grid leak and condenser. This coil, in conjunction with C1, covers the kc. No ground is used. The filament control jack and a Yaxley cable connector permit the use of the same batteries that are slung under the car for a b. For a stay of a few weeks in camp, a few of the small blocks of "B" batteries are taken along.

The dials are the small Marco, and are mounted on! This protects them from rough handling and furnishes a support for the position screw. They are screwed to the original mounting holes on the condenser. Every possible wire has been eliminated and the supports or frame used instead, to minimize loose connections and consequent grief. The receiver is set in a wooden frame in the case, cut out to the contour of the base.

The photograph shows the layout, and Fig. The tuning condensers are made from. They t4! C, - 6-plate Cardwell taper-plate condenser. R, - 2,megohm grid leak. R,, R, - Bradleystats. Jl, ohms. RFC - S. J - Filament control jack. Li, L.

Audio transformers are small Thordarsans. For the benefit of the inexperienced the method of doing this is as follows: Tin both the fitting and the frame with a good coat of solder; file the high spots off the solder and retap the holes, then screw the fittings in place. Heat them with a Bunsen burner or a large hot iron until the solder melts, then tighten the screws so as to ooze the e.

When it cools you have a shakeproof job. The nuts for the compression fittings and the glands are obtainable separately, so a set can be had for a few cents for each set of coils if a QSY is desired. Coils can be changed with the help of a small open-end wrench. The two neutralizing condensers are Pilot midgets cut to 6 plates and double-spaced.

They are symmetrically mounted on the frame. The r. All are wound with No. They are tapped and fastened to the rear January,. This amplifier was used as a push-pull t. The filter to take out com mutator ripple is mounted in the space at the left. This unit is mounted on the running board of the car, and is covered with a hect metal hounng on trips. No details of J,he power supply will be given as they are familiar to anyone building a set of this size.

Only those special adjustments made necessary by portable work will be discussed. Select the type of antenna best suited to the space available. It has been found at times that a Zepp was best fitted to plifier dial for maximum response. Then turn the neutralizing condenser to get minimum reading of the field strength meter. Retune the amplifier tank to maximum field reading and re-neutralize to zero reading.

Then throw the amplifier plate switch on and tune the amplifier to resonance, indicated by a dip in the amplifier plate current. Next, get the monitor out and plug in the 'phones. Tune in the signal on the monitor and zero beat it to the receiver so as to be dead certain that the transmitter is in the band at about the natural period of the Hertz.

Then give the neutralizing condenser a slight turn to get the cleanest possible signal. It should approach crystal in clearness and purity. Hook the antenna and tune for normal plate current on the amplifier and the set is all ready to go. With a little practice the thing can be tuned in three or four minutes.

When beating the monitor to the receiver, the dummy plug is plugged into the monitor and the phones are used for the receiver. The antenna coil is then connected to the grid coil of the final amplifier with a couple of heavy strips of brush braid. With the plate voltage off the final amplifier and the filaments lit, couple the field meter to the final plate coil and neutralize.

The method used with other push-pull amplifiers will apply to this one, and the Handbook and QST should be studied before attempting to put the set on the air. East Coast stations from California were regular diet as the later hours of the evening approached. It is hard to get to the East Coast in the early hours because so many stations are on the air.

With the m. Attach the insulators to suitable supports with a piece of string and screw the antenna to the insulators with the fittings provided. Plug the in the socket, remove the cover of the oscillator shield, put in the tubes, throw off the amplifier switch and tune the oscillator to resonance with the wavemeter. Then cover the oscillator, couple the field-strength meter to the amplifier tank and tune the am- lby. C,, C. Wound full of No. L,-9 turm same. The set has been available for the usual run of dairy shows and flower shows in which either the Oakland Radio Club or the section put in booths, and hundreds of messages have been gotten off with it.

As for its mechanical construction, the writer carried the set over miles on a trip East and did not have a single wire come loose - this in spite of roads so rough at times that upon return it was found that the filament coating of one of the '81's was all shaken loose!

Rationalizing the Autodyne Continued from page 16 chassis. The ground post is connected to the common r. To use the ordinary antennaground connection one of the antenna posts is connected to the ground post and the other used for the antenna. More doublet antennas should be used, however. They improve the signal-noise ratio considerably, its has been pointed out in QST several times, besides doing a better job of picking up DX signals than the foot indoor antennas that many of us use.

A good antenna is worth more than an r. On all but 14 me. The mc. The gain control does not affect the detector tuning so long as it causes no change in the voltage applied to the detector plate; in other words, with battery supply the gain control would be entirely independent of frequency. With a conventional a. The gain control changes the plate and screen-grid current of the r. Some neon-bulb voltage regulation evidently would be in order.

The set as it stands is not perfect, of course; nothing ever is. It is a real pleasure, however, to operate a receiver in which the detector does not block, and on which the signals stay put despite normal variations in the power line voltage. It is satisfying to be able to work distant stations almost within beat note of a local ham station.

And it is even more satisfying to be able to use a decent-sized receiving antenna and know that when it is necessary to go after the weak fellows the r. About the S. Receiver Judging by the questions asked in a goodly proportion of the hundreds of letters that have come in regarding the Single-Signal Superhet described in August and September issues, many readers seem to have missed a few points in reading the articles.

Number one question seems to be, "What's the frequency of the filter crystal? Another question commonly asked is, "Can a kc. Others still ask, "What's the capacity of Cu? And the next guy who insists that he reads every word of QST, "from cover to cover"..!!! Possibly of interest to some constructors are the specifications of the Sickles i.

The primary inductance is 5. So little has been said about foreign hamfests and so much about our own affairs that I hope this will even things up a little. Just by way of explaining how I happen to know anything about Japanese hamfests, let it be known that KDNV, sometimes known by the uninitiated as the President Pierce, would have a hard time behaving herself if it weren't for the juice pumped into her 5-kw.

I'm de guy wot does de pumpin'. Well, we hit Yokohama and Kobe twice each trip and get enough time there to make us want a little more. In good plain English, we like it a lot. This time we arrived at Yokohama with twelve long hours ahead with nothing to do. We decided to call up Mr. We got a rickshaw boy to haul us to "California Frank's" where we hoisted a few. And then from there we sent the. Dunno what Ishii-San told him, but in nothing flat he was back running as if all the demons in China were riding his 'shaw.

He herded us into his and another and took us to the telephone office. Ishii-San was waiting for us, all smiles and bows and with three women old ones , waiting for us with trays of tea and cakes. That's one good thing about Japan. If you're hungry, call on a friend. You're sure to get a cup of tea, and it sure hits the spot sometimes. For about a year, JlEO, Mr. Shima of Tokio and myself have been trying to click.

Either he has been QRL or I have. This time we got thrpugh to him on the 'phone from Ishii-San's office and, wonderful, he was home. He said he'd wait for us to get there and, although we were not dressed for any fancy calling, or high-class receptions, we had no time to change, so off we went.

On the way to the Yokohama station, we picked up Mr. Seiichi Nozaki, also of Yoko, who has as yet no transmitting license but only a permit to receive. He expects to be on the air soon, however. We got on the train finally and, about forty minutes later, dropped off at Tokio. Hot Dawg, you should have seen the bowing and scraping that went on.

Poor "Ash" hadn't ever met any Japanese people before and didn't know how to bow or say anything. He is only a kid and blushes like a school girl. Of course I broke out my two words of Japanese greeting and then forgot the third. Oh well, we all have our little difficulties. And every home has its garden, and the odors of the fiowers - aw well, come and see it yourself.

We reached his home after walking half a mile or so and, after being greeted in the Japanese manner by a pretty little Japanese maid and removing our shoes, we entered. His home is beautiful to say the least, but this ain't a discussion on arch - well, homes, then, so we went upstairs to the shack. The gang was there, boy, and how! Mister, that ain't the half of it, and what was even better, a nice ice cold drink of strawberry juice unfermented.

Of course the set was the first thing we wanted to see. Thirty watts output, crystal control and he's R5 to 6 QSA 4, any morning in the States on a haywire receiver, worked all continents and darned near all countries. But when you see the workmanship in that, and all other Japanese ham sets, you begin to realize how they can do it.

The walls of Shima-San's shack are lined on all sides with charts, graphs, and prints. He is a student of the University of Tokio, already holds ". AMS 4RI! K--" one degree, has invented a new "mike" that's a wow, and designed and installed the public address system used in conjunction with the Far East Olympic Games held in Japan a year or so ago.

He's not the only one, either. J3CT of Osaka uses a single and gets across to the States as one of the four loudest ",J" stations, and it is seldom his input exceeds forty watts. Poor "Ash," he was sure up in t,he air. He had expected to see power, and lots of it, and that little aluminum can was a sad disappointment.

He was trying to juggle a cup of tea, eat a tea cake and take in receiver and transmitter at the same time. It nearly proved too much for my sense of dignity and decorum, but I managed to hang on. After we'd seen all the sets and equipment, Shima-San invited us to chow, the universally January, understood word in the ham language and the most appreciated. The chow was strictly Japanese, served by two very pretty little,japanese maids. Too darn much QRM in Nippon to make eating altogether a pleasure.

Rice and fish, cooked in the little lacquered dish, seaweed soup and a sauce. Believe me, if you want good chow, come to Japan but take those twenty easy lessons first. After finishing up everything in sight, Shima-San invited us to take a look at the view from the window of this room. He is way up on a hillside and, looking out, one sees Fuji, Japan's sacred mountain, in the distance, beautiful Tokio and its environs in the foreground and, immediately below, Shima-San's own garden with his little brother and sister playing.

In a few moments we were asked to seat ourselves again and finish our meal with strawberry juice and Japanese watermelon. During the meal a very learned discussion on the relative merits of Japanese and American YL's was held, which only goes to prove that hams are hams the world over and, anyway, you should see some of these Japanese YL's.

Finally it was all over and, with a sigh of pure contentment, we arose; that is, all but "Ash. Well we only get twelve hours in Yokohama and I had a heavy date in Kobe, so we had to leave. Say, you want to take a ride in a Japanese train if you want a real thrill. I've been in China coast typhoons, in Tahantapec gales and Hatteras blows, but never have been seasick except on a. We hung on to straps, stanchions, bags, hats and the ladies' hair and finally reached Yoko right side up and undamaged.

The whole gang was with us. I lost eount after a while, but I think there were ten of them all wanting to see the ship's s. The Quartermaster at the gangway thought it was an invasion and I had to promise him beaucoup trinkets before he'd let us aboard. The gang thought the ship's layout hot stuff and sure had a swell time looking over the ship, my room, including many photos on the bulkheads and the shack.

We left Yoko finally to u, chorus of banzais and sayonaras from this great gang of chaps on the dock. The whole thing took me back to the old days when a feller walking down the street of a strange town and seeing an antenna, especially if it had four wires and a white pole, immediately went up and punched the front doorbell and asked to see Them days is gone forever in the States, but you still are sure of a welcome if you pull it over here.

Talk about friendship; say, I'm going to need a third op one of these days, and you want to come over. XP Jan. Time Freq. BB G 8: : , 8: : , 8: : , 8: : , 8: 14, 8: Mornino Sched. BX 6: : : : The time specified in the schedules is local standard time,,t the transmitting atation. Chinn in charge. Urie in charge. WWV KC. The accuracy of these transmissions is to better than 1 cycle one in five million. Information on how to receive and utilize the signals is given in Letter Circular LC, obtainable on request from the Bureau.

Communications concerning these transmissions and reports on their reception should be addressed to Bureau of Standards, Washington, D. It is with deep regret that we record the passing of these amateurs: William B. Henry L. Krichbaum, ex-w8bwz, East Cleveland, Ohio. Norvell W. Willard J. Frank B. Thomas B. Election Returns Members and Radio Continued on pags 6!

QST for. Now t-he problem is entirely different. With some A. One of the stablest oscillators known at the present time is the electron--coupled type, previously described for frequency meter use in. Because of its frequency stability with large changes in p! When the new frequency meter was planned, it was desired to sional touch.

This, at first, presented difficulties. However, after experimenting with several breadboard model electron-coupled oscillators it was found that the phones could be connected in the screen-grid or plate lead and give a fairly satisfactory signal.

This permitted the electroncoupled oscillator to be used alone and promised to accomplish the work equally as well as the two separate units ordinarily required. From left to right below the tuning dial are the phone tip Jacks, indicator light and "B" supplyswitch. Desiring a huskier signal than that given by the incidental detection of the oscillator, a separate detector tube was n,dded, with small r.

This gave a completely satisfactory signal and did not complicate the operating procedure. Connecting the, phones in the detector plate circuit in no way disturbs the oscillator circuit. The detector being of the linear type, its output is nearly independent of the signal from the oscillator and proportional to the strength of the signal being monitored, since the outside signal is of much less amplitude at the grid of the detector than the strong signal from the oscillator to which t,he detector grid is coupled.

It was decided to shield the unit completely and it is therefore mounted in a cast aluminum box that measures 10 by 6 by 5 inches and has sufficient space to house both the oscillator and the detector. This makes a solid and well-shielded job to start with. If a cheap and flimsy shield is to be used plenty of trouble can be expected. It is necessary to make the job as rigid and as mechanically strong as possible. Aluminum angles should he used in assembling the sheet aluminum and be drilled and tapped for screws.

If riveting, welding or any other means can be employed in making the box as strong as possible, it should be used. Enough regarding shielding. Many condenser-coil combinations could be January,. This one employs a Cardwell "Midway" Type and a "Midway" assembled as a single unit.

It is adjusted so thai. Needless to say, the condenser assembly should be rigid and one having end or side thrust should not be used. If possible, a condenser having fitted bearings hoth front, and rear should be used. The circuit is shown in Fig. The coil is on the other side of the condenser. This aluminum shelf, by the way, is mounted on brackets connected to the front panel, which tend to make it rigid and prevent any movement of parts due to vibration or when tuning.

The small one,-half watt ,ohm grid resistor is connected between the terminals of the grid condenser and is supported by its pigtails. A short lead from the top of t,he grid condenser connects to the grid of the A by means of a grid clip. The coil consists of 79 turns of No.

After the coil is finished it should be given a good coating of eollodion, "airplane dope" or clear Duco, which will prevent it from becoming loose on the form or absorbing moisture and thereby changing its characteristics. These t,urns can be removed when the coil is adjusted in order to obtain the desired band spread. The exact number of t,urns will probably differ to a slight degree, due to the capacity existing between the wiring, condenser used, etc. But the coil can be adjusted very easily and requires only a few minutes of time.

By using this coil and condenser combination the spread obtained on the meter band is nearly dial divisions. The 1-inch coil form is mounted at, the bottom stator terminals of the variable condenser by small brass angles. Originally the coil was mounted on the top stator terminals, near the grid condenser, but by mounting in the position shown, the cathode lead was shortened approximately a inches. This lead runs from the tap on the coil directly across the set to the cathode terminal on the A socket.

Since it is "above ground," it should be as short and as rigid as possible. Probably it would be a good ide,a to mount the coif so that it, would be even nearer to the socket terminals. In this particular set-up, however, this was not possible. By-pass condensers of several different sizes were tried, the. As nan be seen, the four. The common or "grounded" ends of the bypass condensers are connected by screws 11pproximately 2.!

By adjusting the nuts it is possible to lock the condensers in the desired position and also make them rigid. The entire assembly is then mounted by using by ,'i-inch brass angles and secured to the bottom of the ishelf with screws. The other terminals of the condensers go to the heater, plate and screen-grid leads where they enter the cabinet on the Yaxley plug. Several values were tried for the coupling condenser between the It is mounted by pigtail leads between the A plate and 56 grid circuit.

Most of the parts and the method of their mounting can 28 QST for. Amateurs usually have shielding of a variety of dimensions around their respective radio shacks and, therefore, the mechanical layout must depend somewhat on the eabinet material available. The size of the cabinet in this case prohibited the large 6-inch type dial, so its smaller companion, the 4-inch dial, was pressed into service.

This makes it possible to read to onetenth of a dial division, an especially helpful feature for re-set purposes. The red indicator lamp on the front panel is a very handy device and reduces the possibility of leaving the meter on over night -- as was done several times before t,he light was added.

If more outside pickup is desired, a lead can be brought out from the grid of the detector. II By attaching a short" aerial" extending outside the box, plenty of pickup for nominal headphone operation can be obtained. In choosing the detector, first a Type ' 27 was used, but this was soon discarded in favor of the Type This seems to work considerably better than the '27 and at the same time draws a lower plate current, making the load easier for the batteries or power pack.

With volts on the plate of the 56, 00 on the plate of the A and 45 on the screen grid, the combined current is 2 milliamperes. The onemegohm grid resistor is recommended for use with the Type 56 t,ube and is used. This resistor, together with the ,ohm cathode resistor and the. The phones are connected in the plate circuit of t,he 56 by means of phone tip jacks, mounted on the front panel.

A small toggle switch is connected in the negative B lead so it is possible to stop the oscillator but leave the 2. Otherwise, when working a station near your own frequency it will be necessary to detune the oscillator in order to hear the incoming signal on the receiver. Closing or opening the switch makes it possible to listen to your own transmitter and then cut off the oscillator when receiving. In order to monitor the signals of the transmitter, some means of quickly changing the phones from the output circuit of the receiver to the output of the monitor must be employed.

This is accomplished by a double-pole double- throw switch, conveniently mounted on the operating table. Several means can be used, such as A. Sec text. C4, C5, Cs, C1, -. R,- ,ohm 1-watt si:i;e. R, - 1,megohm 1-watt size. R, - ,,ohm 1-watt size. L, - 79 turns No. Originally, this meter was designed for operation on the broadcast band to kc. The electron-coupled oscillator being an excellent harmonic generator, the harmonics were unusually strong on even the meter band.

This type of calibration could be made to work out very well, however, since the Federal Radio Commission's General Order Number After the broadcast set faffed, the coil was revamped for to kc. To date the meter has been checked four times against the and kc. Before calibrating or rechecking, the meter should be turned on and allowed to warm up.

This allows the tubes to reach a constant operating temperature and eliminates the possibility of frequency drift during calibration. Usually ao to 45 minutes is more than sufficient time for the meter to " settle down" to a constant value. Very few exist. If the parts are not defective especially the A and are wired correctly, then the oscillator usually starts right off.

A few amateurs have written in stating that they could not obtain strong harmonics from this type of oscillator on the 7- and mc. The strength of these harmonics can be increased somewhat by enlarging the portion of the coil between the cathode and negative "B" or ground connections.

This lack of strength on the and mc. If the cathode-ground section of the coil is made too large, the result will be excessive feed-back and instability. This can be detected, by listening to the oscillator in the receiver, when the note sounds like it had several r. It can be corrected by decreasing the resistance of the grid leak or moving the cathode tap down on the coil.

As a rule the cathode-ground portion of the coil should consist of approximately one-third of the entire coil, which proportion minimizes the possibility of getting the r. All in all, the electron-coupled type frequency meter is an excellent unit, especially when combined with a good detector to provide monitoring, and is recommended for use at all amateur stations - whether they use self-excited or costly m. You can find it if you stay close to the shore, but when you get into deep water it is something else.

Sawyer Ave. Frequency meters and monitors have not been all that is expected of them, if judgment may be made on casual remarks heard here and there around the country. Either the gadget doesn't stay put, or the batteries are dead or the signal from the transmitter is too weak when using it as a monitor. Each one of these things is true in one case or another. Many different types have been used at W9UZ and finally this present one cleared the room of everyt,hing else that had been used.

During a ten-hour test for frequency drift after c, c, R. C, - Bandfis ead tuning condenser. Can be two pieces of insulated bus wire overlapped an inch or so. Ci- l. I ,henry filter choke. R, - ,ohm oscillator grid leak, 1-watt. R,- Detector grid coupling resistor, I-megohm I-watt. Rs- Detector cathode resistor, ,ohm 1-watt. R,,ohm 1-watt voltage divider. Equivalent to 12, ohms.

RFC- 1. T- Plate and filarrumt transformer. Receiver power pack type. The frequency range for the 7-mc.

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Namespaces Article Talk. Views Read Edit View history. Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time. No data shared with third parties Learn more about how developers declare sharing. No data collected Learn more about how developers declare collection. Selection is not highlighted seems to only affect the configuration tab , you must go completely down and then back up again before your selection gets highlighted.

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Selection is not highlighted seems to only affect the configuration tab , you must go completely down and then back up again before your selection gets highlighted. As this is still on its infancy, Im willing to give this a chance and give it 4 stars. Excellent job!! I used to use Transmission on my Linux system since even today it's the default torrent client for many distros and is preinstalled. However quality wise the clients hasn't improved much.

And this Android version is not something I would recommend. Nowadays most torrent sites rely on magnet links. The Android version appears to struggle with magnet links immensely and I haven't had a single instance when it worked right away. With your typical torrent files it works without a problem.

In terms of UI I never liked the clear difference there is between the client's standard UI and the web-based on - plain lack of consistency. If I use qbittorent on my desktop to save the magnet link as a torrent file and transfer it to my phone, Transmission works with it as expected. This is usually my default torrent app for my laptop with Linux. It was giving me an error when I tried to add a file but it was an issue with Firefox. Transmission works perfectly fine. And I do not get people who give this app low rate only because they want a fancier ui.

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