On Fri, 2006-08-04 at 07:12 -0400, Carter, K8VT wrote:
> So, the Omni VII preliminary specs say "Collins mechanical filters"...
>
> Now, back in the day, I was a Drake man, not too much into Collins.
> However, I vaguely remember reading something about mechanical filters
> not being the best under QRN conditions. (subject to ringing or some
> type of distortion???)
S-line vintage Collins filters were bad about ringing. The IF output
connector showed a continuous envelope from line noise. They turn static
clicks to lengthy crashes.
The rounded shoulders inherent in the ladder filters used for a long
time in analogue Tentecs don't ring much. Lightning still sounds like
clicks.
>
> Any comments on mechanical filters vs crystal filters?? Any problems
> with mechanicals and QRN , or is my memory failing me (again)? :-)
The new Collins mechanical filter for CW in my FT-857D doesn't seem to
ring nearly as much as the SSB filter did in my 75S-3B.
>
> Inquiring minds want to know...
>
> 73,
> Carter K8VT
--
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|