If you want to test it at lower power, figure what plate voltage and plate
current will give the same load impedance as the high power load you are
designing for.
Example: 3000 volts at 1 amp (using 1.8 factor) gives 1666 ohms. If you
decrease the plate voltage to 1/2 and the plate current to 1/2 you will have
the same load impedance.
1500 volts at .5 amp (still using 1.8 factor) gives 1666 ohms.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Partain, Chuck
> Sent: Tuesday, April 18, 2006 6:49 PM
> To: Phil Clements; PA3DUV; amps@contesting.com
> Subject: Re: [Amps] working backwards to setup tank
>
> :) yea, its all out of the circuit, at this point i'm not even going thru
> it.
> right from the plate thru the resistor to gnd as you do when you setup
> initially.
> No power ever applied, the analyzer is AOK
>
> If I use a 2k ohm load I can set it up for a good match, but when the amp
> is running
> the setups are off by a bit, this was my sanity check, now i'm nutso ;)
>
>
>
> ________________________________
>
> From: amps-bounces@contesting.com on behalf of Phil Clements
> Sent: Tue 4/18/2006 6:29 PM
> To: 'PA3DUV'; amps@contesting.com
> Subject: Re: [Amps] working backwards to setup tank
>
>
>
> > > I set this tank circuit up and tuned at 7.250mhz, came up with a
> > beautiful
> > > output
> > > then tried to do the reverse check. I put a 2k resistor from the plate
> > to
> > > ground, hooked
> > > the MFJ analizer up using the settings previously obtained and for th
> e
> > > life of me cannot find
> > > a good resistive value to make the swr analizer 1:1 swr or close. I
> used
>
> Is your antenna relay keyed up or jumpered?
>
> (((73)))
> Phil, K5PC
>
>
>
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