[Yaesu] Re FT 990

[KA4INM]

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.