[Icom] InRad 9MHz filter in IC-746
Dave
[email protected]
Sat, 2 Mar 2002 01:27:49 -0000
You may experience a few problems when using such long lengths of coax in
the filter path. Apart from the capacitive effects of the RG178. May be
worth your connecting it directly to the board...just a thought :-).
Regards,
Dave G3VFP
----- Original Message -----
From: "Martin Davies G0HDB" <[email protected]>
To: <[email protected]>
Sent: Friday, March 01, 2002 9:19 PM
Subject: [Icom] InRad 9MHz filter in IC-746
> I've just installed an InRad 400Hz b/width 9MHz filter (#111) into my
IC-746,
> in the position suggested by InRad so the connecting leads (I've used
> RG178 sub-min PTFE coax) are about 22-23ins long. I'm finding that there
> seems to be some leakage around the filter - I can hear a low-level
residual
> signal as I tune up to a few kHz HF of the frequency of a strong carrier
(eg
> S9+).
>
> Has anyone else experienced this effect with a narrow InRad filter and
found
> a way to improve the isolation between the filter's input and output, and
> hence achieve the ultimate rejection specified for the filter (>90dB)?
>
> 73 and thanks in advance,
> ---
> Martin, G0HDB
>
> ----
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