On Thu, 30 Nov 2006 20:59:40 GMT, Bart Bailey wrote:

In ups.com
posted on 30 Nov 2006 06:06:29 -0800, Steve wrote: Begin


wrote:
I found this web page while looking for a nifty audio filter I found
last year.
At the very least it gives food for thought.

http://www.radiointel.com/phil/phils_radio_tuning_tricks.pdf

Terry

There are some helpful hints here, though I'm puzzled by the gripe this
fellow has with synchronous detection. I personally wouldn't spend a
lot of dough on any receiver that lacked it. I think a lot of people
are sour on synchronous detection because they've bought and/or used a
receiver that had a very poor implementation of it. When sync detection
is done right, as it is on Drake's R8B, then it will sometimes do more
to aid reception than all of these hints put together. But the good
news is that we don't have to choose between synchronous detection and
this fellow's helpful hints. We can have all of these tools at our
disposal.

Steve

At least the guy gave a thumbs up to the Drake designed SAM in the E1,
although it wasn't referred to in his comments about pass band tuning.
I use both when conditions are rough, as is sometimes the case with KGO
(810) at night, the narrowest 2.3kc IF bandwidth filter combined with a
PBT shift of +1.2kc and a USB sync, which allows complete rejection of
the local XESPN (800) and shifts the audio to a more balanced sound.
The use of wider bandwidth IF filters work fine with SAM on easy
conditions like Radio Australia but in a crowd the extra bandwidth tends
to allow more of an AGC reduction from the then included but undesirable
signals. This is especially true if I'm trying to pick off KKOB (770)
from the side of the local powerhouse KFMB (760).
FWIW: Local is San Diego and the target stations are;
KGO (810) - San Francisco CA
KKOB (770) - Albuquerque NM
The other local interference station XESPN (800) is in Tijuana MX

KFMB 760 S9+15

KKOB 770 S9+10

KKOH 780 S9+15

KABC 790 (out of night pattern)

XESPN 800 S9+12

KGO 810 S9+15

All coming in beautifully (except KABC)

R8B PreAmp Off 50' Random Wire

Lang Station, CA