[TenTec] Ten-Tec Rig Comparisons

[Charles P. Steinmetz]

Mike wrote:

>Everyone seems to have their own opinion about this, but I agree with
>you, Barry. I vary the receive bandwidth to compensate for changes in
>QRM and QRN , as well as to accommodate and enhance the frequency
>response characteristics of the station I am trying to copy. It's
>amazing how sometimes a small tweak can have a huge impact on
>intelligibility.  Having this flexibility reduces listening fatigue for
>me, whether it's a rag chew, contest or weak signal DX situation.

IME this is very sensitive to implementation -- I find I'm often 
wanting to tweak DSP and mechanical filters, but with a well-chosen 
set of LC filters (Drake R8 series, for example) I'm content not to 
have further adjustments.  I think it is a function of group delay 
and ringing, because DSP filters seem (to me) to need less tweaking 
if they are set for rounder corners/less ringing/better phase 
response than if they are screwed down tight.

Also IME, the LC implementations are far superior to any mechanical 
or DSP filter in terms of fidelity and lack of listening 
fatigue.  Listen to an R390 and R390A side by side (where there are 
few material differences besides the filters) for a very graphic demonstration.

Best regards,

Charles