[ARC5] BC-454B tuneup

Dennis Monticelli dennis.monticelli at gmail.com
Thu Nov 30 06:09:08 EST 2017


You may be injecting too much signal into the IF for the BFO to handle.

Dennis AE6C

On Wed, Nov 29, 2017 at 7:21 PM, J Mcvey via ARC5 <arc5 at mailman.qth.net>
wrote:

> There isn't much to go wrong in the BFO LC other than perhaps some
> corrosion of the tuning caps rotor contacts. The internal 1000pf is just a
> coupling cap and the other 200pf (?) external  is also used as coupling.
> The BFO is not all that stable, but I was always able to get one to zero
> beat if it worked.
>
> Dumb question, but did you turn off the generator audio modulation while
> doing the zero beat adjustment?
>
>
> On Wednesday, November 29, 2017 9:40 PM, "kg4kgl at gmail.com" <
> kg4kgl at gmail.com> wrote:
>
>
> Hello all,
>
> In tuning up this receiver, I am injecting a signal at the mixer grid cap,
> and adjusting the BFO oscillator, attempting to zero beat the BFO. I can
> never achieve a full zero beat. I still hear the tone  only less so after
> adjustment. What would cause this? Where should I be looking?
>
> Tnx,
>
> Robert
> KG4KGL
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