On 02/25/13 20:05, Ronald A VE7YC Stunden wrote:
Looking for information on what looks like a factory mod on the RF Board
for the FT 990.
2 Diodes and a what could be a RF choke or a 100 ohm resistor. Also a
cut trace on the board Thanks
The crack Yaesu production team substituted a cheaper diode and as a
result the performance suffered. The modification was to install over
20 (23 or 28?) of the PIN diodes that the designers specified in the
first place. (on several of the modules)
google says:
http://www.eham.net/ehamforum/smf/index.php?topic=20574.0
http://www.kb2ljj.com/data/yaesu/ft-990.htm
http://forums.qrz.com/showthread.php?143770-Yaesu-FT-990
http://lists.contesting.com/_yaesu/2001-12/msg00042.html
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=12&cad=rja&ved=0CFEQFjABOAo&url=http%3A%2F%2Ff6aoj.ao-journal.com%2Fcrbst_104.html&ei=6RgsUej7FpHS9ATImICQBA&usg=AFQjCNFXT3Rq8BN4nraUDRsv4UrDh-iODw&bvm=bv.42965579,d.eWU
(let google translate)
http://www.hampedia.net/yaesu/ft-990.php
--
Ron KA4INM - Youvan's corollary:
Every action results in unwanted side effects.
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