[ICOM] IC-781 - was IC7800

[Adam Farson]

Hi Tim,

Yes, the IF filters are also in the transmit signal path. The 2.4 kHz pair will provide the same 3dB occupied bandwidth as in the IC-751A, which uses the FL-80/FL-44A pair, but the FL-223 will degrade transmitted audio fidelity. I found that the 2.4 kHz filter pair offered the best compromise between adjacent-channel selectivity and transmitted audio articulation.

I used to get around this (when required) by setting up Split with the FL-223 on receive (WIDE button pressed) but the FL-80 on transmit. TX and RX frequencies were equal.

It is so much easier with the IC-7800, IC-7700 etc.

Cheers for now, 73,
Adam, VA7OJ/AB4OJ

----- Original Message -----
From: Tim Duffy K3LR <k3lr at k3lr.com>
Date: Wednesday, March 19, 2008 8:51 am
Subject: RE: [ICOM] IC-781 -  was IC7800
To: 'ICOM Reflector' <icom at mailman.qth.net>

> When using these narrow filters, are they also part of the 
> transmitter chain
> (i.e. they might reduce the transmitted bandwidth and fidelity)?
> 
> 73,
> Tim K3LR
> 
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-
> bounces at mailman.qth.net] On
> Behalf Of Adam Farson
> Sent: Wednesday, March 19, 2008 1:08 AM
> To: 'ICOM Reflector'
> Subject: RE: [ICOM] IC-781 - was IC7800
> 
> Hi Mike,
> 
> Glad you were able to snag a 109. It, and the FL-223, will make 
> quite a
> difference to your IC-781 on SSB.
> 
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>  
>