RadioBanter - View Single Post - Variations on the channel TRF AM tube tuner; and a question

June 14th 04, 01:49 AM

In article , wrote:

*****

I do have a couple questions of both John and Patrick (and anyone else
caring to chime in) related to this.

1) In the single frequency TRF tube receiver (a TRF designed strictly
to listen to a single frequency), is there a need for double tuned
circuits? Or will singly tuned circuits be sufficient for
excellent performance (audio quality, sensitivity and
selectivity)? If not, how do double tuned circuits benefit the
overall performance of the single frequency TRF receiver?

The advantage of the double tuned circuit over two single tuned circuits
is that it has a better shape factor, the pass band response is flatter.
This advantage applies to single frequency as well as tunable receivers.
Even better response curves can be achieved with three, four, or even six
section filters.

Regards,

John Byrns

Surf my web pages at, http://users.rcn.com/jbyrns/