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| Photos donated by Dan Collier (VE7DES). To see all the photos Dan has contributed to the Archives, click here. |
| Kenwood (Trio) TS-520 200-watt amateur HF transceiver. Transmitter is hybrid, with solid state exciter circuitry, 12BY7A driver tube, and a pair of S2001 (Asian 6146) final tubes. The transmitter has a classic pi network. Tuning is all mechanical, including the VFO, which tunes 600 kHz segments on 80m through 10m (10m covered in 3 segments). Driver and receiver circuits are peaked with capacitors ganged with a chain drive. All controls must be peaked repeatedly as the operator changes frequency. The back panel features a jack for a VHF transverter, an accessory that was never marketed. The knob beside the meter is the "fixed frequency" channel switch. The operator could install 4 crystals for his favourite frequencies, allowing him to bypass the tunable VFO. I rewired the switch to control an active audio filter that I built from a circuit from the 1979 ARRL Handbook. "DX Pull On" enables the rudimentary speech processor. More of a speech harshener, but still useful. This was a very successful product for Kenwood and is so highly regarded that many are still in use 40 years later. The 520 was evolved into the TS-520S by adding 160 meters, and then the TS-820S with digital readout -- but retaining the mechanical tuning. I was the second or third owner when I purchased it in 1979. The TS-520 may be operated at reduced power from automobile 12 volts. A built-in inverter utilizes windings on the main power transformer. I mounted the 520 in a 1971 Firebird and used it with Hustler antennas until I replaced it with an Icom 735, which is much easier to use while driving. The TS-520 was stored for 20 years but worked OK when I dusted it off and made a few contacts during the 2011 Field Day contest. |
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The
"Archives" are maintained just for fun by Steve Adams at the Radio
Attic. When cabinet material or color differences are apparent or suspected in donated photos, I have included additional photos of certain model numbers. Due to time constraints, I must rely entirely on the accuracy of information supplied by contributors with their photographs. As such, no guarantee is made that the model numbers presented here are correct. Images may be used
for non-commercial purposes with attribution. © 2001, 2024 the Radio Attic |