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[Yaesu] FT-920, Inrad Filters & RTTY -- HELP!

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Subject: [Yaesu] FT-920, Inrad Filters & RTTY -- HELP!
From: martyt@pobox.com (Marty Tippin)
Date: Sat, 02 Dec 2000 14:45:17 -0600
Hoping someone can help me with a problem I'm having:

I have a FT-920 with the InRad add-on filter board, which allows selection 
between either a single SSB filter or two in cascade. In my case, I have a 
2.1KHz and 1.8KHz filter on the board. I also have an InRad 400Hz narrow CW 
filter installed.

Prior to installing the InRad add-on board, I had only the 400Hz Narrow 
filter and a 2.1KHz Inrad SSB filter installed. When operating in RTTY 
(DATA / USB) I was able to select the 400 Hz filter as expected - however, 
after installing the add-on board, nothing happens when I select the narrow 
filter - that is, there is no change in received bandwidth. On CW mode, the 
narrow filter works just like it always did.

The add-on board is a minor installation task - it has two coaxial leads 
that solder in place of the on-board SSB filter, and two more leads that 
provide power for switching between the boards.

To test my theory that the problem is caused by the add-on board, and at 
the suggestion of George at InRad, I disconnected the coax leads from the 
add-on board and soldered them temporarily to the stock Yaesu SSB filter. 
At that point, the narrow filter worked again in RTTY mode. This would 
point to a problem with the add-on board, but the board functions normally 
when in SSB mode so I'm not sure how that could be the case.

Looking for anyone else on the list who has this same combination of 
filters (including the add-on board) to compare notes. Any other 
suggestions would be appreciated as well.

Thanks & 73,

-Marty NW0L

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