|[AMRadio] Valiant carrier...|
garyschafer at comcast.net
Wed Jun 15 18:06:14 EDT 2011
Don't forget that the plate meter is actually metering cathode current. This
includes screen current and grid current which totals around 55 ma. You need
to subtract that amount from the plate current meter when figuring
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net [mailto:amradio-
> bounces at mailman.qth.net] On Behalf Of Jim Wilhite
> Sent: Wednesday, June 15, 2011 3:42 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Valiant carrier...
> Rick, Johnson put ~600 volts on the plate of the Valiant and Viking
> series radios which is for Continuous Carrier operation. Then with 330
> Ma. you get input of 198 watts and the best output I have ever seen from
> a Valiant is ~120 watts, which is about 60%.
> The DX 100 radio has just two 6146s and gave the same power output.
> They put about 800 volts on the final which is Intermittent service. I
> believe you will find that 70% figure is under certain circumstance you
> may not have in the Johnson, or for that matter in the Heath.
> ----- Original Message -----
> >I agree, 75% should be possible and I hope I'm able to get there.
> > Rick / K5IAR
> > From: amradio-bounces at mailman.qth.net
> > [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Ron Youvan
> > Sent: Wednesday, June 15, 2011 2:25 PM
> > To: Discussion of AM Radio in the Amateur Service
> > Subject: Re: [AMRadio] Valiant carrier...
> > I don't know the Valiant, but 75% using class "C" should not be a
> > problem, but 400 Watts PEP from three 6146s seems a bit of a stretch.
> > I think you are going to need between 800 and 900 Volts on the plates
> > to
> > maximize the power output to do it.
> > --
> > Ron KA4INM -
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