I recently bought a Westinghouse GP-7 transmitter in the swap meet at this year’s annual West Coast Military Radio Collectors Group meeting, held in San Luis Obispo, CA at the beginning of May. This transmitter was made for use in Navy aircraft, and it requires 120 VAC 800 Hz power like other Navy radios of its era. Aircraft commonly use AC power at higher frequencies than our common 60 Hz “wall power” so that their transformers and motors can be lighter. The higher power frequencies allow transformers and motors to use less massive iron cores without magnetic saturation. 400 Hz power is now commonly used in large aircraft that require AC power supplies, but this transmitter was made before 400 Hz power became the standard. Unfortunately, it can’t simply be plugged into 60 Hz power. That would saturate the transformer cores, and then they would release their magic smoke and stop working.
Radio equipment and accessories.
Last weekend, the 18th annual meeting of the Military Radio Collectors Group was held in San Luis Obispo, California, at Camp San Luis Obispo’s NCO club. The event included equipment displays, presentations, field operations and a swap meet. I had a great time, and nearly every other comment I heard about this year’s meet was positive. I’m already looking forward to next year’s annual meeting, as well as the occasional field events we’ll probably have throughout the year.
The annual Military Radio Collectors Group meeting at Camp San Luis Obispo is almost here! This year, I’m pleased to announce that we’ll be conducting a joint crypto-related operation with the Maritime Radio Historical Society’s Coast Station KSM. Here’s their announcement of the operation.
I bought this TBY-4 transceiver in November, 2007 for the princely sum of $26. I plan to retore it to operation, and I’ll add more information about it here… someday. In the mean time, here are some pictures.
Instructions for Installation of Radio Sets AN/GRC-9 or SCR-694-C in Combination with Radio Sets AN/GRC-3 to 8, AN/VRQ-1 to 3, AN/VRC-8 to 10, AN/VRC-16 to 18, AN/PRC-8 to 10, or SCR-619 in Truck, 1/4 Ton, 4×4, Utility, M38 & M38A1 (Warning: 35 meg PDF file!)
Thanks go to Ken Perkins for the scans, and Wes Knettle for passing them along to me.
Here are some pictures that I took at the 2007 West Coast Military Radio Collector’s Group meeting on May 4 and May 5 in San Luis Obispo, California.
I bought this radio at the 2006 West Coast Military Radio Collector’s Group meeting, and then later traded it away for something else.