[INRAD] Icom band decoders

[K4RO Kirk Pickering]

Thanks to KE9UW and K4IK for the suggestions.
I had forgotten about the extra resistor for
the IC-775, and I should have found that in the 
manual first.  I believe I clipped it on one of
the decoders, but perhaps not the other.  It's 
an intermittent problem, and I've swapped band
decoders back and forth a few times.

Regarding the second problem of the 80m antenna
being partially selected along with other antennas,
I'd like to know more about where the pullup resistor 
should be placed.  This is a show stopper as it 
makes all antenna positions unusable.

I've been informed that this is an INRAD list and
not a TopTen list.  My apologies for not getting
the distinction before; this will be my last post
here on the subject. I would appreciate any help
on the second problem via direct email.

73

-Kirk  K4RO


On Fri, May 27, 2005 at 08:20:55PM -0500, c-hawley at uiuc.edu wrote:
> Is there a circuit diagram somewhere? I have built these for 
> my own use over the years and just offhand I'd say that a 
> tweaking of the voltage divider for the input to the 
> decoding chip may fix the first problem to better center the 
> voltage input from the Icom (without knowing how it is 
> designed). And, a 1 K or so pullup resistor may fix the 
> second problem (again without any knowlege of how it is 
> designed).
> Chuck KE9UW