Cic Inverter

Alan Wilson WA9HES 308 East Wood Street Hillsboro IL Alan Wilson WA9HES 308 East Wood Street Hillsboro IL Been looking around frantically for one of I he good converter circuits Here's one that uses a Nuvislor for gain and low noise on 6 meters. The first addition to my 6 meter station was the converter described below. The unit is designed with the idea of obtaining high performance with a minimum of circuitry, I will attempt to describe the unit in such a way that it can be easily duplicated....

Ii

A PRACTICAL 10-kHz-STEP SYNTHESIZER FOR TWO METERS Figure 7 shows the full transceiver block diagram. Output from the synthesizer is I mW in the frequency range of 144 148 MHz (transmitter), and 1 mW, 135-139 MHz. to the receiver first mixer Modulation is applied directly to the synthesizer for the transmit function. The block labeled TfR lowc is the circuit board that changes the synthesizer output range when the transmitter is keyed it also serves to switch the receiver and transmitter and...

John Meshna Jr

19 ALLERTON ST., LYNN, MASS- 01904 P. O, BOX 62, E. LYNN, MASS. 01904 WORLD RADIO has used gear with trial-terms-guarantee 99'er- 79,95 910A-S179.95 SR150 299,95 HW10-S 129.95 HW32- 89.95 Swan 400 420 299,95 Swan 250-5229.95 D uoBander 8 4- 109.95 75 3-S 129,95 N C 200 S 2 49.95 S B 33-S 1 99.9 5 Galaxy Vmk2 279,95 Ranger 2-S 149.95 200V 399.95, Free blue-book list for more. Write WORLD RADIO, 3415 West Broadway, Council Bluffs IA 51501. TECH MANUALS R-390, R 390A, OS-8C U, 6.50 each. Many...

Info

The year was 1745, and scientific circles were all agog over that strange force called electricity, in England, several decades earlier, Francis Hawksbee had built an electric machine which produced unprecedented quantities of this mysterious power, and Stephen Gray had demonstrated that the power could actually flow from one substance to another. Two Frenchmen, Francois de Cisternay Dufay and Abbe Nollet had discovered two different kinds of electrical power, each capable of neutralizing the...

We For Tubes

Lewiipaul Electronics, Inc. 303 West Crescent Avenue Ailandaie, New Jersey 07401 Development of a new single-pole, double-throw magnetic latching coaxial relay has been announced by Dow-Key, The relay, which measures approximately 2 x 2 x 3 4 in., will handle SOW CW or FM, I00W PEP at frequencies up to L2 GHz. The no-bounce latching feature of the new relay makes it especially suitable for satellite and other applications where power consump-lion is ot critical importance. The maximum vswr is...

Amateur Radio In India

Marie Welsh W6JEP Reprinted from LERC Bulletin G. V. Sulu (VU2GV) was kind enough to send a copy of the Radio & Electronics Society of India RESi> Book Series 1 Amateur Radio Regulations in India, compiled by M. V. Kini (VU2SZK This 1968 First Edition is very interesting and our readers may appreciate the following highlights which I've extracted from the book 1. No 160 or 6 meter privileges. 2. 10 kHz only on 80 meters 3890-3900 kHz. 3. 100 kHz only on 40 meters 7,0-7.1 MHz. 4. 20, 15,...

Miniature Test Laboratory

AC Voltmeter Ohmmeter RF Signal Generator Resistance Substitution 9V DC Supply Self Powered DC Voltmeter Milliammeter AF Signal Generator Capacitance Substitution RF Field Strength x 33 * x 3& 1 Thanks to transistors and printed circuits you can hold this complete lab in one hand. Not long ago this would have been a whole sheff full of test equipment. 455 khz generator for aiigfning if's, 400 hi generator for audio circuits, Plus a normal VOM and R& C substitution. Field Strength meter...

Fm Anthology

This book is largely a collection from FM Bulletin, edited by K6MVH and WA8UTB. The material is taken from the editions of February 1967 through February 1968. Vol. II. This book contains selected technical and construction articles taken from FM Magazine after March 1968, 3 A humorous account of The antics of a group of lids during the early days of FM in Los Angeles. Included are details, schematics, and plans for a remotely controlled amateur station. S3 filled with formulas, charts,...

Q

Operation using the Waters 75 meter coil with the Band-Adder (see Dec., 67, 73 Magazine) makes it possible to operate 10-15-20 and 75 without getting out to change coils. Waters and New-Tronics claim a 52 ohm match and require no further matching device, Webster suggests the use of some type of impedance matching on 80 and 40 meters. Tests have shown that a 1,000 pf silver-dipped mica capacitor from the center conductor to ground provides a good impedance match on 80, and a 400 pf capacitor...

Brand Names

You can save enormous amounts of money while choosing from a complete line of transceivers, receivers, transmitters etc, WE HAVE EVERYTHING IN HAM GEAR SAVE MONEY ORDER BY MAIL CB Radio Co., Inc. sg Aspen Rd. These rules can be written as a series of algebraic equations, and to apply them to the analysis of any arbitrary network we must do just that. The laws state that all the current must be accounted for, and (he equations do the accounting. Since a filter is a network, the filter can be...

United Radio Company

56-A Ferry Street, Newark, IMew Jersey 07105 Increase talk power drastically - Installs internally - always with yon -Fixed - Mobile - DXptditioning So Holes 15 min. installation in Full year warranty - free literature Fig. 8. MHz amplifier with 25 dB gain and good age characteristics. The HEP 590 can also be used in this circuit with similar results, grated Circuit RF IF Amplifier,1' provides more information on using the MC1550G. The HEPS90 is similar to the MCI550G. Both are packaged in the...

Prestel Field Strength Meter

If A Gold-Mine for Antenna Installers And 470 to 860 Megahertz. Calibrated outword from 10 to 50,000 Microvolts. Nothing makes it easier to properly and speedily find the correct place to install TV, FM and Communication Antennas. You can measure and hear the signals with this 4' volt battery economically powered unit. There is nothing else like it 548 Broadway, New York, New York 10012, Phone 212-925-6000

Used Test Equipment

Measurements 1 1 1 crystal calibrator , , Measurements 71 sq. wave generator. . lektronix 180A time-mark generator . Fluke 101 VAW meter w 3 shunts , , . S Trioiab 131-1 phase-sensitive ac vtvm, full scale, 1 mV to 300V near new . . .3 Precision E-200 C sig, gen. 90 kc 30 mcS Dumont 294-A scope. Response to 12 mc, high voltage acceleration for photography of transients, scope amp cabinet amp dial bez el .j . . .4 . Sorensen Nobatron DCR-150-5 0-150 vdc, 5A max., adj. current Jimtting , , 60,00...

Mike

Fig4 High-gain audio amplifier using MFC4010 wideband amplifier, The MFC4010 is especially useful as a microphone amplifier or as a general-purpose 455 kHz i-f amplifier. A typical circuit using this device is shown in Fig. 4. It operates from 6V it's an audio amplifier for a microphone, and as you can see, very few external components are required to provide high gain. The MFC4010 itself contains three transistors and five resistors. Another ow- evel audio amplifier is the MCI303P in the...

Or WhistleOn

The FCC sanctions the use of semicontrol techniques such as continuous-tone carrier squelch systems very low frequency tones accompanying all carriers and single-tone tone-burst entry or whistle-on access in applications where limited access to a remole station or a repeater is desirable. The W6FNO repeater in Southern California went one step further, and the result is a repeater that is fully compatible with two-way nonrepeater operation taking place on the input channel. In many ways, the...

Khz

Laboratory , . because they're big, expensive, precision instruments right So what's one doing in the CX7 Welf, it gives you CALIBRATION ACCURACY OF 100 HZ at every point in every band READOUT DIRECT TO 100 HZ . , . without interpolation LIFETIME PRECISION . . , free of error due to aging or environment BIG, BRIGHT DISPLAY , , virtually impossible to mis-read SIGNAL ONE engineers did it by putting stale-of-the-art technology to work in a precision counter no larger than a small book. This...

Swan Antenna Company

Push Talk Circuit For Radio

Union Box 1122 464-9897 Stockton, California 95201 adopt this method, just connect a 200 2 resistor in series with the tone oscillator output lead before attaching it to the carbon mike pin on the control head connector. If the local repeater is the whistle-on variety rather than tone-burst entry , you might also find it convenient to run the audio lead through a single-pole switch mounted on the control head. In this way, you can switch the tone on whenever you want it gt and keep it...

Advertiser Index

Gordon, H. 75 O Hafstfom 97 James Research 142,143 G Jan Crystal 32 Jeff-Tronics 123 O LewispauJ 140 Radiation Pt oducts 97 Q RP E ectronics 121 Telre 5 Tower 118 Tristao 107 UFO Net 109 United 121 Vanguard 21,27 Varitronics 7r 59 o Vibroplex 103 73 Magazine Books 94, 95 Maps 132r 133 Radio Handbook 125 Subscription 65 Haven't got time to brov se through the ads Just put an X by the subject that makes you flip Oscillators code C Oscillators iff Towers transceivers if M Transceivers fVHF...

The Best Deal

The National NCX 500 with its AC-500 currently sells at 425.00 and 99.00 respectively. Thus, thts deal is both timely and thrifty. If you have waited because you could not afford a modern rig, here is your buy now even while the rest of the world goes up on price. Since we opened our door we have never had such an attractive ham opportunity We offer to hams, world wide, the famous National NCX-500 transceiver new at the thrifty price of 249.95. With the companion AC-500 power supply the total...

Carrier Operated Relay

Carrier Operated Relay

Fig. 3-3, Burst decoder and carrier-operated relay connections. illustrates how this might be easily achieved. The repeater control relay iK2 should be fairly husky it can be driven directly by the decoder relay k It is not wise to derive the K2 switching functions by wiring the contacts of K1 directly, because KTs contacts are likely to be of a delicate nature. K1 is a sensitive, current-operated relay and its contacts are best used for no greater requirement than to control a heavy-duty dc...

Current Used Gear List

Collins 7531 Rcvr, w wts. rjtn. tuning Hallicrafter S-B5 Gen. Cov. Receiver xcvr. w spkr. Hammarlund HQ 170 ham band rcvr , Heath HG-IO vto Heath HR10 Hamband Receiver Heathkit MX20 SSB xmtr. w hp 20 sply. Johnson Ranger it transmitter Johnson 6N2 VHF transmitter Mitlen 92201 Transmatch ant. tuner Swan 14c DC module Swan 120 20 meter transceiver Swan 260 Cygnet xcvr. like new Swan 350 w AC suppiy console Swan 350 both sidebands xtal calfb, 11 7c supply Swan 41 OC vfo new for 350c 50Gc Swan 500c...

Denson Electronic Corp

Conn. 06066 A very simple receiver providing quite good performance could be made using a few of these integrated circuits. Discrete dual-gate MOSFETs are better in the front end an MFE3007 is an excellent rf amplifier. An MFE3008 mixer with a separate oscillator could feed an MC1350P i-f amplifier, then a detector and MC1306P audio output amplifier. An older, but very good, linear IC is the MC1550G rf i-f amplifier. This is a much simpler circuit than the MCI3SOP, but...

Kmvh

Advised by my lawyara that ou goons don't ever proofr t insist the t you prin t ev should o boiled in oil ov Someone mentioned to me the possibility that your magazine was being recorded on magnetic tape for the use of interested blind persons. If this is true, please let me know where 1 might apply in order to borrow these tapes. Oliver K. Mtxon W4DJF Augusta-Richmond County Municipal Building Augusta, Georgia Recorded tapes of 73 are vaiJabie from Science for the BJind 221 Rock Hill Road Bala...

Mc1590 455 Khz If Amplifier

Primary l20iiH center tapped Cirr mT position of Li and C2 are mtsrchanged Primary winding 24 turns 36 AWG close wound on 1 4 dia form Core Arnold Type TH or etiuiv Secondary winding M 2 turns 36 AWG, 1 4h dia. i Jote 3 Primary winding gt 8 turns P22 AWG cftmertappod Secondary winding 1 turn 022 AWG over-wound at Fig. 7. High-gain i-f amplifier with wide-range age action. Circuit vaJues are shown for 455 kHz, 10.7 MHz, and 45 MHz except modulating large AM transmitters, which hardly...