Schematic

Pictorial schematic and schematic of the 1250 mc mixer. will do. I just wanted to show off that I had 1 72 bolts.) You can get them and the razor saw in a hobby shop. The jacks are located on either side of LI, as shown in Fig, 4. The oscillator jack has a one pi small disc capacitor with about inch leads connected to it. The other lead goes to LI about each from the cold end. Some pulling of the oscillator can be found as CI is tuned, but not too much. Of course, you can use a 200 mc...

Dynalab Company

215-28 Spencer Ave., Queens Village, N.Y, 11427 With the 2-K LINEAR AMPLIFIER beauty is obviously more than skin deep. The true functional beauty of the RF module is evident when removed from it's cabinet. Designed to be the Rolls-Royce of linear amplifiers, the enthusiastic response to the 2-K proves again that the amateur wants the finest. And make no mistake, it is the finest. You cannot buy a better linear. The 2-K is loaded with engineering plus values which guarantee the highest quality...

Info

Typical quarter wave tuned circuit. The quarter wave line can be rolled up as in the balanced tanks in this transverter, divided into efficiency and power (brute force) mixers. Balanced mixers provide suppression of the carrier and excellent distortion figures. However, they are a little more complicated than unbalanced ones. Brute force mixers are rarely used in practical heterodyning equipment because of the high ppwei requirements, Efl ciencv mixers are much more common. Various...

Mls

For screen grid and grid prongs we cannibalized an old 304TL socket. With the ring part removed, the fitting fits very snugly. Screw-on clamps (like hose clamps) were used for the filament connections. The tube itself is held upright by a ring clamp that has four feet bent out on it and bolted to the chassis. A glass chimney was not available but it was discovered that a 10 tin can is about the right size so one end was removed and a hole the same as the one in chassis was punched in the other....

Available Only Through Authorized Distributors

Box 19406 Dallas, Texas 75219 Please send me the descriptive brochure of Design Industries full line of com* mumcations desks and custom consoles and the name of the nearest distributor ou can operate your amateur radio equipment right in your living room with this inexpen munications desk from Design Industries. Youlf like its custom features . , . functionally tilted top surface holds your equipment at just the right operating angle . . . deep cable trough...

Out

Fjg, 1, Alternate output circuit to provide 50 ohm output for the 2N2950. However, at that time, the prices ol the transistors were quite high, I then settled for two tubes and a vara ci or,1 Since then prices have come down, as much as 50 on one transistor in particular. It was decided that the plunge had to be made even if for no better reason than my own personal satisfaction. Although the ultimate goal of the circuits shown is 432 mc energy, these can be broken down to give output power at...

Bottom View Nb

Note the screwy basing guide on the 2N3478. Fig, 2. Final circuit of the dip meter. to the PC copper. Note that the case in the higher one is just for looks. The oscillator is built on a piece of copper clad board and held in place with the variable capacitor mounting nut. After you've finished construction, turn the base pot down and turn the power on. If the meter pins, you turned the pot the wrong way. Correct it quickly. Then adj ust for about 1 ma collector...

Mobile Antenna For Every Installation

I he most versatile, complete line of mobile antennas for the amateur market. Complementing the well known line of standard Heliwhips 160 through 6 meters are the tri-band HW-3, which with accessory elements permits instant choice of three of the bands from 80 thru 10 meters and the KW line of high power Heliwhips for 40 through 10 meters. Also, the HWD line of portable or fixed station short dipoles for 40 through 10 meters, 8 to 16 feet long, rated 1 KW. CV-3147, CVS-2144 fixed and mobile 2...

International Licensing in the Belgian Rallies

The Belgians were probably the first to organise truly International Mobile Radio Rallies giving temporary mobile licences to all Amateurs, irrespective of whether their country gave reciprocal facilities to the Belgian Nationals, or not. It began in April 1963, when an International Rally was organised by the newest and sma est section of the Belgian National Radio Association UtB.A. by ON4PL in Verviers near the Dutch and German frontiers. Licences were obtained from the Belgian authorities...

Vhfuhf Dipmeter

50 to 600 mc with almost no work or cost Not ioo long ago, 1 decided to make a 432 mc converter, There were very few requirements in this design. First, it had to be unlike anyone else's a matter of pride. Anyway their junk boxes don't have the same things in them that mine does, Secondly, it had to be transistorized, since tubes are obsolete for this type of use, and transistors are much cheaper, easier to build with, use less power, and should have unlimited life. Thirdly, it had to be...

Magazine

This Quement SWR bridge and field strength meter will help you get the mo t out of your antenna and transmitter id minimum price. It will take a full kilowatt and can remain iti the litiv all the time. It's 52 ohm impedance, of course. The instrument comes complete with instructions and schematic. Quement Eli -tronies, 1000 South Bascom, San Jose, California. Any ham who builds will find this little kit very useful, its the easiest, most convenient way to breadboard circuits I've seen. In fact,...

For mc

At I1LOV, we use one ahead of a modified Centimeg converter with two stages of rf amplification to get up over the noise for the weak signals. Since the plate circuit tunes continuously from 410 to 440 mc, it can also be used to tune iu some commercial radio links from 418 to 425 mc The circuit is the usual simple grounded grid amplifier usually used at these frequencies, It has an untuned cathode and a half wave plate line with link output. The grid connection of the...

Vanguard Labs

Heterodyne Vfo

H-l 2 196-23 Jamaica Ave, Hollis, N.Y. 11423 Bill Hoisington KICLL Peterborough, N.H, The six meter solid state heterodyne VFO exciter. A really low cost practical heterodyne VFO rig for six meters is described. The Sprague 2N1726 transistors used are listed amateur net, quantities 1 to 99, for only 1,15. And as you will see they are actually easier to handle and tune up than tubes, once you get used to them. No line cord, no transformer power supply, just a small 9 or 12 volt battery and...

Transistor Superhet

I iF experimenting is fun, Talking to someone on 432 or 1250 takes some work, but gives you the thrill of knowing that you have accomplished something hat few other hams have done. In the May 1965 73, I described a tube-type station for 1215 mc, Since it was developed, I have done some nore work and come up with a this simple-to-build transistorized receiver for the band. It is for broadband reception, but can be modified for narrowband use if desired. You can have a lot of fun with this...

I

Prices amp Specifications Subject to change without notice. AM-161 J About this time each year, hams start trying to figure out how to get hammy gifts instead of the traditional ties, pajamas and socks they usually end up with. Unfortunately, unless a ham is unusually ruthless and buys his own presents, he ends up being happy with the socks, i 'his section of gills priced under 10 may help von a bit. Circle the most interesting ones in red and leave this copy of 73 open conspicuously for a...