Sony ICF-SW7600GR Mega-Sensitivity Boost
Last summer, prompted by the need to pack an extremely compact but sensitive SSB spotting receiver for Ultralight DU chasing, I replaced the stock 4.75" x .35" loopstick on a Sony ICF-SW7600GR with an Amidon 7.5" ferrite bar, wound with 40/44 Litz wire to match the two stock coil inductances. The result was a huge sensitivity boost with no apparent ill effects, making this compact model superior in weak-signal capability to even a stock ICF-2010.
Unfortunately, due to multiple hobby and other commitments, there hasn't yet been time to write a formal article detailing this procedure, although it is quite within the capability of the average hobbyist. Prompted by repeated requests from some DXers in Europe, I have been able to write a summarized version, which would be suitable for a technically experienced person to perform the transplant. There are also several photos available on request, showing the new loopstick coil arrangement and mounting system. Interested DXers can receive any or all of these files upon request.
73, Gary DeBock
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