This sounds like parasitic oscillation. The frequency may be at a frequency
the wattmeter can't handle. Or perhaps a resonance in the wattmeter itself.
I would first try another wattmeter.
What Amp are you using?
Check all your coax connections. Perhaps a loose connection that opens up
when the power is applied.
73s de Jim
> -----Original Message-----
> From: email@example.com
> [mailto:firstname.lastname@example.org]On Behalf Of Jim in Waco wb5oxq
> Sent: Monday, April 16, 2012 6:37 PM
> To: TowerTalk@contesting.com
> Subject: [TowerTalk] strange wattmeter reading on beam
> I have a Force 12 C-3 beam with a 5kw DX Engineering balun and
> rg 213 cable. everything works well on 20, swr is low and tube
> amp loads properly.
> On 15 swr is a little higher about 1.6-1 but the amp tunes
> funny. The wattmeter pegs past 2kw and 4 572B tubes cannot put
> out that much power and also the plate current only reads about
> 400ma at 2400 vdc so there is no way the output is that high.
> 10 meters works ok also. I will not use the amp on 15 until I
> find out what is going on.
> Jim wb5oxq.
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