Thanks to Greg for the info on his success with the
756.
To make a long story short, I just rechecked the Omni
this morning and the feedback with the 756 at full rf
throttle is gone. My apologies for throwing the curve
ball to the reflector about the 756. One of the old
quirky probs with my Omni that I hadn't seen in quite
a while just happened to rear its head at the precise
instant that I installed the 756. It is the problem I
spoke of once before as "PBT shifts with heat."
Well, I guess it isn't necessarily heat related. I
did notice last evening that my normal 11 oclock cw
PBT position had shifted to 12 oclock and I didn't pay
it much heed, thinking it was just related to the new
filter (not). PBT position is also back to normal
this morning.
73,
Barry N1EU
--- Greg Hodsdon <k7kj@teleport.com> wrote:
> Hi Barry:
> I've had the Inrad 756 (2.4khz/10pole) filter
> installed in the first IF
> of my Omni 6+ since March and have noted no RF gain
> feedback problems at
> all during operation. I just rechecked per your
> suggestion both into a
> dummy load and with the coax disconnected at the
> radio, and again, no
> problems with audio whistles or anything. Most of my
> operation is cw and
> I normally operate with the RF gain fully clockwise.
> I have been very
> satisfied with the operation of the 756 and the
> other Inrad filters
> (2.1khz/1st IF, 400hz/1st IF, and 250hz/PBT IF) that
> are in the Omni.
>
> The 756 was originally intended to replace the fixed
> 9Mhz IF tx and rx
> filter and not as an accessory filter, although
> there is no reason it
> could not be used that way.
>
> You might ask George to send out another filter to
> compare against.
>
> Good Luck and 73,
> Greg, K7KJ
> Portland, OR
>
>
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