[Johnson] Amp advice

[C Eus]

Being that you sent the amp info request to a Johnson
and the AM radio listservers, I take it that implies
you want to operate this amplifier on amplitude
modulation, correct? If this is the case, I think the
suggest way to use an amp on AM is to determine its
operating output (in PEP), divide by 4  (or 3, I
forgot which) and drive the amp out to that figure and
operated on AM. 

This is because the amp now not only has to amplify
the single signal as before (be it CW or SSB) but it
has to amplify the carrier and the two sidebands. 

Other than that, clean up the equipment of its
"construction defectoria" and do normal inspection
prior to putting on the air. They sound like
relatively new equipment. FWIW. Cal, N6KYR/8.

--- John Lawson <jpl15 at panix.com> wrote:

> 
>   I have recently acquired (from the estate of a
> Silent Key) an Ameritron 
> AL-80 (not A, B, or C) and the Ameritorn ATR-15
> tuner.
> 
>   These were used together for years, then sat for
> an unknown length of 
> time before being disconnected and moved.   I am the
> second owner.
> 
>    The tuner exhibits constructional saliency with
> masonry defecatoria, and 
> appears to be in nearly factory-new shape internally
> - the case is dusty a 
> bit, but also very nice.
> 
>    The amp, [while modified slightly with some extra
> ventilation holes and 
> a large power-transistor type heatsink bolted to the
> case adjacent to 
> where the 3-500Z lives], seems to be visually in
> good shape - it seems to 
> have had one of it's power-equalizing resistors (on
> the rectifier/filter 
> board) replaced. It's wired for a 220 mains supply,
> which I will also 
> operate it on.
> 
>   Initially I'll be driving the AL-80 with a Ranger,
> thence into the 
> ATR-15, 450-ohm ladderline to the 450' fence-top
> loop guarding my back 
> yard.  I've completed the re-route of that
> ladder-line following previous 
> suggestions and admonishments, BTW - and thanks to
> y'all for that!!
> 
> 
>    I've not owned a higher-power amp before, so
> aside from the usual 
> caveats concerning powering up 'older' gear for the
> first time - I was 
> wondering if there are any Ameritron-specific
> "gotchas" to be aware of - 
> and certainly if there is any wisdom, anecdotes, or
> cautions concerning 
> this amp - especially as I'm going to use it on AM
> fone - I'd be 
> appreciative of the experiences you've
> (collectively) had.
> 
> 
>    Cheers
> 
> John KB6SCO
> Johnson mailing list
> Home:
> http://mailman.qth.net/mailman/listinfo/johnson
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Johnson at mailman.qth.net
> 



	
		
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