[AMRadio] Re: Hammarlund questions...

[Gary Schafer]

It is common for the bfo to block the receiver. Most receivers that do not have a product detector the
bfo is injected into the last IF stage. The avc detector detects the bfo signal as a strong carrier
(which it is) and generates a large avc voltage shutting down the receiver sensitivity. To copy SSB you
need to turn the avc off and turn down the RF gain and turn the audio gain almost all the way up. Then
ride the RF gain control to control volume.

73
Gary  K4FMX


Bruce - KB6LWN wrote:

> Hi Jim,
>
> I have same problem (I think) with my 110C (SN 844).
> If I leave the AVC ON, I don't hear ANYthing when
> SSB mode selected.  The only way I can hear SB is
> to switch the AVC OFF, which is what the manual
> says to do for that mode, but even then - the SB
> signals are a lot weaker than I believe they
> SHOULD be.
>
> Btw, have you been able to get your 50 Mc band
> aligned correctly ?  I've been fussing with it
> for the last several months and can't seem to
> get it clos, even when using the procedure out-
> lined in the docs about tuning 50 KC off then
> putting the cabinet on.  I'm thinking about
> enlarging one or two of the perf holes in the
> bottom in order to get a tuning tool in there
> to adjust it while the case is ON.  Unless some-
> one has a better idea.
>
> And Jim...  Yes there IS a Hammarlund list.
> I believe it's at the Tempe AZ site, but I'll
> look it up for you and get it to you directly.
>
> 73 - Bruce
>
> PS: You wouldn't happen to have an FM-60A manual would you ?
>
> On Sat, 19 Jan 2002, Norcross, James wrote:
>
> > HQ 110A has variation in BFO wiring as shown in the schematic I have.
> > The receiver blocks if switched to AVC and is in CW/SSB mode. Very
> > strong BFO signal seems to be the reason
> > AVC maxes out and blocks reception. This is a later built HQ110A VHF
> > model.
>
> > ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÀ1Š‰šŠX§‚X¬´iبþf¢–f§þ«aþw­†Ûiÿÿæj)fjê¶çzßæj)fjåŠËbú?jjÚ
>
> Hey Jim...  What's THIS ^^^^^^^^^^^^^ ???
>
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