Impedance Bridge
Here is a complete set of full scale drawings of the parts for the Impedance Bridge which was featured in the August 1965 issue of 73. This bridge is one of the most useful pieces of test equipment that you could possibly build. It would cost you hundreds of dollars to buy this unit commercially made. This set of plans comes complete with a reprint of the original article, There have been many requests for a giant sized schematic of the wonderful little transceiver that appeared in the November...
I Xgl
VlG I SCHEMATIC WATERS UNIVERSAL HYBRID COUPLER-MODEL 300 p L i r h- h TO i Mi niH P'' VlG I SCHEMATIC WATERS UNIVERSAL HYBRID COUPLER-MODEL 300 it. When W9XYZ comes on I say Hey Joe, 1 got some word on your XYL and I spi3 the tape when I switch the Coupler to PLAYBACK TO XMTR. Easy, eh. Real traffic men will need no priming. They'll accept messages by telephone by recording direct from the line and store them till net time. They will save net time by recording incoming radio traffic for copy...
Propagation Chart
David A. Brown K2IGY 30 L mbert Avenue Farmingdaf , N. Y. For the DX propagation chart, I have listed the HBF which is the best Ham Band Frequency to be used for the time periods given. A higher HBF will not work and a lower HBF sometimes will work, but not nearly as well-The time is in GMT, not local time, i lie Short Path propagation chart has been set up to show what HBF to use for coverage between the 48 states, Alaska and Hawaii are covered in the DX chart The use of this chart is somewhat...
V
Surplus Index gt ooks are in print and we have a whole rait more in preparation. Tilings look pretty good. We are going to do everything we can this fall to make sure that as many amateurs as possible are convinced to subscribe, Those of you that like wliat we are doing and want to help can accomplish a lot by mentioning our articles and the magazine during your QSOs. You can talk up 73 in club bulletins and at club meetings. We try to be restrained in our promotion, leaving the enthusiasm up...
Wafer Mode Sw 1
tube. The signal output is at pin 5 through the KC network, which connects into the mode switch. The circuit, as per schematic, is quite standard and no mention of small components are necessary since they are all listed in the parts list or shown on the drawings. The second mixer is also a HBE6 pentagrid converter tube with separate injection oscillators consisting of a 12AT7 wired as dual xta oscillators, using crystals of 1515 and 1685 kc. The oscillators can be turned on by grounding the...
Amateur Dept S
Amateur amp Commercial transmit ters amp receivers 91-46 LEFFERTS BOULEVARD RICHMOND HILL 18, NEW YORK Phone Hickory 1-7890
The Finney Company 1
Dipt. 20. 34 W. Interstate St, Bedford, Ohio Patent RE 24.J13 Other patents pending 6 A 2 Meter Model No. A-62 Amateur Net A 62 33,00 Slacking Kit AS-62 2.19 Patent RE 24.J13 Other patents pending 6 A 2 Meter Model No. A-62 Amateur Net A 62 33,00 Slacking Kit AS-62 2.19 A6 4 G Meter A Element Amateur Net 17.16 Stacking Kit AS-6 2.19 AMO 2 Meter 10 Element Amateur Net 11.88 Stacking Kit AS-2 1.33 A1W-10 VA Meter 10 Element Amateur Net 11.83 A6 4 G Meter A Element Amateur Net 17.16 Stacking Kit...
Ameco Model Csb Converter Selector Box
Model CSB makes bandswitch ing possible with several VHF converters. 4-position selector switch allows user to switch any one of up to 3 converters or connect the receiver directly to the low band antenna. Both RF and power are auto maticalfy switched. Can be used with Ameco or other makes of converters and power supplies. Available in kit form only, with all plugs and cables. Sue 2 x 2Y2rf x4Yz' 9.95
Irving Electronics Co 1
a POST OFFICE BOX 9222 SAN ANTONIO4 TEXAS mobile power at exceptionally low cost Tftpaz Static Converter operate the majority of mobile transmitters and receivers. Through new concepts in converter etrcuitiy the o units deliver more watte per dollar than any rnm parable unit In addition, ihoy are smaller and lighter in weight, ami higher in efficiency This means increafi savings through lunp-r Lifts of butter tea ant generators. New model nrv iujw available designed specifically for or...
I Ixo
3.1 0 .Van 1.00 fi.00 11,on 7,00 9.00 V.00 ff TERMS Min Ordw 3 25 '' wllh ordor F.O.B. New York Ten tfay ou amp mntee, prle of mdte only, Our I8th yw, Prices mhoutn arm tubfmet Io chang . iriJG Liberty St., N. Y 6 N, Y, RE 2-0245 TWO fiCA's and FlLAMEWTjC X F M R 10 KV iml tl SPECIAL '
Three Important Reasons Why You Need The
.- . . . i _ -. aass .- . . . i _ -. aass Side View only two clamping screws are m place. Actually five are used, the remainder were not replaced by the photographer Side View only two clamping screws are m place. Actually five are used, the remainder were not replaced by the photographer purchasing a fancy disc neutralizing cacparitor and dissembling and remounting the disc to tune the tank circuit. The coupling links are made of 14 gauge wire to coaxial sockets placed 4 from the end of the...
Ok Front Panel 1
oversize holes to permit good alignment converters. In conclusion may I say that in the past few months I have received a number of letters and post cards voicing constructive criticism from those that are duplicating the Tri-Mode Monitor described in Nov. I960 issue of this magazine. Most of the mail stated that pertinent details and photos were not included in the manuscript thereby making construction of that project more difficult. So to comply with these requests, I sincerely hope that...
Ameco Model Biu Bridge Indicator Unit
Model BIU, when used with the Ameco SW8 or other make of bridge, will accurately read SWR, percentage power and percentage voltage 3 scales . Contains a sensitive 100 microampere 2V D'Arsonval meter. Unique switching circuit provides for reading either one of 2 bridges. Charcoal grey cabinet with satin copper panel, Wired and tested. 15,95 A true ham station, ideal for both fixed station and mobile operation Double conversion superhet gives ou extreme se- lation. Transmitter section has an...
Vdc 1
C 25 V ELECTROLTYiC SEE TEXT CR SILICON D 0D ANY POWER TYPE. K'l -K-2 - 8 VDC SENSITIVE RELAY, POTTER a QRUMFIEL0 TYPE RS50 OR EQUAL lt C MOOtFiED KEYING ORCUIT ADAPTED TO 2CVOC RELAYS. 20 watts Simple to convert 242 mc DXT-2 Beacon Transmitter, measures 4 x 4 x II complete with antenna, water-tight case and sidetone modulator. Power required 300V DC amp 6.3V. Uses two I2AT7 and one 6360 final not furnished , Schematic and 2-meter conversion data included. Hundreds sold already at this fabulous...