[IRCA] Sony ICF-SW7600GR Mega-Sensitivity Boost

[D1028Gary@xxxxxxx]

Hello All,
 
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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