[AMRadio] VFO vs XTAL


Ellen Rugowski ellenjoanne2003 at sbcglobal.net
Wed Oct 17 21:24:28 EDT 2007


Ahhh,

That's no big deal Geoff. I still get about 25-30W of carrier even with 2 ma
of grid current.

73,
Ellen - AF9J


----- Original Message ----- 
From: "Geoff/W5OMR" <ars.w5omr at gmail.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Wednesday, October 17, 2007 8:10 PM
Subject: Re: [AMRadio] VFO vs XTAL


> Rick Brashear wrote:
> > It doesn't matter as far as the operation is concerned IF there is
enough
> > drive.  I'm not getting sufficient drive from either.  However, I am
getting
> > much more drive from the internal crystal oscillator than from the
Viking
> > VFO and I found that strange.  I would have thought the VFO would put
out
> > more RF than the xtal oscillator.
> >
>
> What rig is this in, Rick?  MAn, the Viking 122 VFO, at least on the
> Viking II, has -plenty- of drive!
>
> I keep my grid drive control down, on 80m, around 2.5 or 3 on the knob.
> That gives me around 7.5mA of grid drive for the pair of 6146's (yeah,
> Ellen - I've been meaning to send you that correction - Johnson says a
> single 6146 needs no more than 2.5mA of grid drive, the pair in the
> Viking II needs 7.5mA of grid drive, and I'm guessing (someone tell me
> for sure) that the Valiant, with it's (3) 6146's needs around 10mA of
> grid drive?) and if I crank the knob up to around 5 or 6, then I've in
> excess of 10mA of grid drive on the pair of 6146's.
>
> -- 
> Driving your AM Rig without a scope,
> is like driving your car at night, without headlights. (K4KYV)
>
> --
> 73 = Best Regards,
> -Geoff/W5OMR
>
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