J

Pig. j L Typical power gain performance of a cascade configuration at various supply voltages. minimum to maximum with the bias voltage applied to Q2 This circuit yields excellent modulation characteristics with about 9X3 modulation, Both up and down, easily achieved with very low distortion. A 50 MHz modulator is shown in Fig, 9, This typical circuit should spark ideas for other modulation applications, for example, the previously described oscillator or oscillators at other frequencies could...

WDTY

o sensitive broadband RF detector gives audible tone signal in the presence of any RF field from lOmw to 1 kw and 100k< to 1000 me a CW monitor with positive RF switch uses only 6pickup antenna and NO connection to rrg or key o code practice oscillator with adjustable tone & built in speaker high gain 4 transistor circuit powered by long fife AA pcncetl 16 gouge aluminum cabinet in white & black epoxy f inish, 3 W2 by 7 3 8 by ' 4 weight B ounces 100 US mode and guaranteed I C. ppd usq...

RMS

Most of the components are not critical. They're discussed in the text. The dots by the transformer windings indicate the polarity of the rewound secondaries. if will absorb the soup. On the way to the charger it wouldn't hurt to accidently drop the battery in a carefully planned trajectory on its bottom edge. This will serve to break loose the chemical build-up which frequently tends to short out cells. An old style battery with the lead straps exposed on the...

Transistors

A TO-5 package (2N206Q) containing two high gain 100 MHz silicon NPN transistors. PNP dual transistors. A TO 5 package (2N2807) containing two high gain 100 MHz silicon PNP transistors. NPN high voltage transistors, 150 VBCO at 2,5 A with a gain of 100 in a TO-3 package. 1.50 PNP silicon epitaxial low leakage transistor in TO-18 package Similar to 2N2185 30 volts at 150 mw. Similar to 2N329A general purpose PNP epitaxial transistor in TO-5 pack. Low leakage 30 volt unit...

Magazine

Said there was some trouble with the wheel or rudder. Alter he hud pushed and pulled un the wheel a few minutes it suddenly started free wheeling and thats when he said, we have some bad trouble somewhere. Down he went to wake up the captain and the ship turned broadside to the wind, the engines were turned off and all sails let down. Seems like everyone on the ship suddenly woke up when the ship turned broadside to the wind and began to really toss and pitch. The captain and all the rest of us...

New York

Farmmgdale, L-L Arrow Electronics 900 Broad Hollow Road Phone MY4-6800 New York Airex Radio Corporation 132 Nassau Street Phone W04-1820 New York Dale Electronics 244 W, 14th Street Phone AL5-3660 New York Grand Central Radio 24 E. 44th Street Phone MU2-3869 New York Harrison Radio Corporation 225 Greenwich Street Phone BA7-7777 New York Harvey Radio Co , Inc. 2 W. 45th Street Phone JU2-1500 New York Packard Electronics Corporation 33 Union Square West Phone OR4-432

Keaw

Several months ago, in reply to a comment about a QSO being long-path, VQ9VC remarked, 'There are two long paths It may be a long way from W6 to VQ9, but it is a problem to determine where those paths are. An inspection of a great-circle chart will disclose that one longitude and one latitude occupy the entire border of the chart. This makes it clear why a station at your antipode may be heard from any direction that provides a good signal path, even though this path is neither short nor long...

For Cash

Most any type or quantity Receiving, transmitting, special purpose, magnetrons, klystrons We will make you an immediate otter in cash. Surplus communication and test equipment AN GRC-3, 4, 5, 6, 7, 8, 10, 19, 26, 21, 46, VRC-12 AN PRC-8, 9, 10, 25 Test equipment with ARM, SG, URM, UPM, USM, and TS prefixes Communications AN TRC-1, 24, 35, 36 Receivers AN APR-9,13,14, R-388A, R-274, R-390A, R-391, etc. Indicators 10-250, 251, 387, 257A, etc. Aircraft AN ARC-21, 34, 38, 44, 52, 55, 57, 13, 84 AN...

I

Bill Hoisington Kl CLL Peterborough, N.H. 03458 Here's a higher power final amplifier for two meters for all of vou devoted K1CLL followers. this rig. Push pull has been used for VHF for well over 30 years, and ever since the pre-war days the general design for medium power tubes has centered around the double beam power tube with plates on the top and one glass bottle. Examples of WW2 tubes of this type of course are the 832 and 829. Since then a nice new series of this same type 5S94, etc...

Microwave Oscillator

Philip Mold of sty K30JK Michael Paolini Jerrold Electronics Corp. Philadelphia, Pa. Even if you don't expect to build this stable oscillator, you find the description of it interesting. It provides stability within I Hz at even 6-25 GHz. The solid-state oscillator described below provides up to two watts output with rock-stable frequency control trom approximately 400 to 900 MHz and can be tuned for second harmonics up to approximately 1800 MHz with as much as 500 mW out. The power and the...

Ameco Equipment Corp

Div, of Aerotron, Inc. 178 HERRICKS RD., MINEOLA, L. 1 N. Y. 11501 MONITORS TRANSMITTER'S RF OUTPUT WITHOUT ANY CONNECTING WIRES TRANSISTORIZED KfT OR WIRED BUILT-IN SPEAKER LOW COST Model OM is a combination code practice oscillator and C.W. monitor. It monitors the transmitter's RF output WITHOUT any connection to the transmitter, it may be used with any ham transmitter or transceiver. There is a tone control and headphone jack on the front panel. Model OM contains 2 transistors and 4 diodes....

Low High

Them both to be exactly 6 mA, Xote that inasmuch as I put in another 10 kilohm grid resistor, I now have 5 kilohms for the two grids. Actually the grid resistor turns out to be very non-critical so enough on that I tried coupling the exciter to the grids capacitively and by a link, but both methods provided practically identical results, The final total grid current both tubes through the grid resistor was 7.3 mA with no high voltage on, and 6 mA with the high voltage applied. The screen...

Ili J

Darrell Thorpe 3110 N. 83rd SUeei Scottsdale, Arizona practical general grated circuits Here's a short introduction cults for inexpensive IC's If you are going to keep abreast of the most modern solid state circuitry, it's time to start thinking about using linear integrated circuits. Motorola and RCA have recently made available, off distributor shelves, monolithic integrated circuits suitable for operation up to bout 100 MHz. And, the best news is that these latest solid state innovations are...

Turns

Schematic of W6AJFs low cost, low noise, low cross-modulation, two meter converter. Note that only the mixer uses an FET the mixer Is responsible for most cross-modulation. Top view of the converter described in this article. It's built on a I' a11 x 6M piece of copper-clad board. The copper is on the underside. Top view of the converter described in this article. It's built on a I' a11 x 6M piece of copper-clad board. The copper is on the underside. obtained a feu. The rf gain md NTF...

Station Accessories

3001 Universal Hybrid Phone Patch 3002 As above, with Compreamp 358 Compreamp Kit for 3001 334 Dummy Load Wattmeter lOOOw 374 Dummy Load Wattmeter fSOOw 384 Dummy Load no Wattmeter 331 Little Dipper 372 361 Codax Automatic Keyer 369 371-1 Wide-Range Attenuator 371-2 As above, with BNC Connectors 372-3 As above, with Type N Connectors

Motorola Equipment

PA-8270 remote unit as it S 55 DO TU-312H cavities 150 Mcs Can be used tor alexin Hi en single antenna _ , S120 00 D33-7 Front mount Dispatcher 6 vdc solid state pc sup 3 tnb Trat,s 8 atts ottlpuc . , s 65.00 FSTR'140 B 110 ae desk top station 60W-30-50 mcs poor condition S125 00 FSTR-80-BY 110 vac desk top station loan version Wwes- .iHEL A Btr iand Very dean P bfl 5175,00 TU-204 450 me tran strip 18 t 5 00 PA-8634 30 30o0mc xmtr J 15 00 T51AG0 Poor Condition 6 12 vdc S 30 90

Kerv

When you bring a transmission line into the shack, many times the most obvious route goes right through a window screen. Much to the consternation of the XYL, many hams are apt to stick a screw driver into the screen and spread the strands a little bit, A neater method Is to use a conventional chassis punch about a half inch in diameter. To prevent the strands from unraveling, several techniques may be used. If the screen is brass or copper, the strands around the opening may be soldered...

Alltronicshoward Model L Rtty Converter

Telewriter Medel frequency shift converter designed rar two-tone AM or Fii with iimiter operation available by switch. Solid stale ratio corrector compensates for fad iff siiri l - permits copying on Mark or Space only. Selector magnet dc loop supply built-in with bias supply and o tal socket for optional pMar relay to key transmitter. Gtt'ft keyer tube, Ptug-in discriminator for 850 cycle or other shifts. Cathode rap or dual eye Indicator. Auto-start control system optional. Friers for 19 rack...

Coaxial Switches

335 SP6T Antenna Switch 336 DPDT Linears in amp out 341 SPDT Antenna Switch 351 Dual DPDT in amp out switching 375 PROTAX SP6T Antenna Switch 376 PROTAX SP5T Antenna Switch 378 SP5T Antenna Switch 380 PROTAX SPDT Antenna Switch NOTE PROTAX Coaxial Switches provide automatic grounding of unused terminals. Models 376 and 378 have Radial Terminals all others have axial terminals.

Info

Mhz Converter

Fig, L 50 MHz converter using field effect transistor rf amplifier and mixer. The FET's cost about 1 each. This converter has a noise figure of around 2 dB and groat resistance to cross-modulation. Top view of W6AJFs six meter FET converter. The extra hole by the BNC input jack was used for neutralizing irimmer that proved unnecessary. Top view of W6AJFs six meter FET converter. The extra hole by the BNC input jack was used for neutralizing irimmer that proved unnecessary. V'i x 6 inches for...

Name

I r r-rv n a- r. - - State Zip Bob Baird W7CSD 3740 Summers Lane Klamath Fallt, Oregon Here are some very cheap portable antennas that work well. There are occasions when you want an antenna to use for a short time and you would like not to make a major investment You'll even settle for something less than optimum. Sue1 situations are representative of the sometimes mobileer, the vacationer in the woods or at the beach, the short time renter and the guy with limited real estate. Many of us...

Cowect To

Tuned Amplifier With

Schematic diagram of the RCA OA 3005 integrated circuit rf amplifier. and Q3 are functioning as a common-emitter common-base pair which is better known as a cascode configuration. This configuration has a very distinct advantage because it considerably reduces the internal feedback as compared to a single transistor. The fact that the internal feedback is extremely low means that these circuits the MC 1550 and CA 3005 are very stable, and you wont have to concern yourself with...

How To Convert Surplus Radio Gear Into Amateur And Cb Equipment

Order No. 311, Vol. Covers BC-454, AN APS 13, BC-457, ARC-5r G0-9 TB W, BC-357, BC-946B, BC-375, LM, TA-12B, AN ART-I3, AVT-112A, AM-2G AIC, ARB, etc.Order No, 322, VoL 3. Covers APN-1, APN-4, ARC-4, ARC-5, ART-13, BC-191, 3 1 2, 342, 348. 375, 442, 453, 455, 456-459, 603, 624, 696, 1066, 1253, CBY-5200, COL 43065, CRC-7, DM-34f DY-2, DY-8, FT 241At MD-7 ARC-5, R-9 APN-4. R-28 ARC-5, RM 52-53, RT-l 9 ARC-4, RT-1 59, SCR-274N, 508. 522. 528. 538, T-15 to T-23...

February

Many UHF converters suffer from lack of local injection. W60SA seems to have solved this problem in his converter. Maybe you could use his arrangement, It seems to the writer that every UHF converter he builds up with the same basic deficiency marginal crystal ci irren t through the mixer diode. This deficiency in turn has always been traced to the same cause low output from the last tube in the multiplier string. Maybe this is because I operate my multiplier tubes at their rated input while...

Arrow Specials

Furnished in excellent condition with tubes and conversion data 17.50 Jackson model 652. 20 to 20,000 cps sine wave output. Excellent 34,50 Sub unit for frequency shift converter CV-89A URA8A. New 49,50 2534 S. MICHIGAN AVENUE CHICAGO, ILLINOIS 60616 Electronic Measurement Power Supply Model 212AM 30.00 Metered 20.00 Unmetered 95130 Primary - 118 Volts Secondary 500 Watts Model 20 13-150 - 30.00 High Voltage D,C Power Supply by G,E. Output 6000 VoSts at 1 Ma. 4000...