[AMRadio] Filament Voltage

[Steve Cloutier, 978-597-3311]

Hi!

Have you checked the 220 coming into the transmitter?  Does it drop alot
when you transmit?  If so, you might have to deal with that problem first.
You could break off the low power sections of the transmitter and run all
of that on another circuit.  Run the high voltage power supply by itself,
and everything else on its own circuit.  I don't think that would be too
hard to do, thinking about it.

Regards,

Steve WA1QIX

At 04:32 PM 3/24/02 -0800, you wrote:
>Greetings:
>
>I have very poor filament voltage regulation on the Gates BC1-J. The
>transmitter is designed with a rheostat on the front panel to set the
>voltage to 10 volts. Of course it is designed to run around the clock. If I
>set the voltage at standby to 10 (filaments glowing, all plate voltages off)
>when I move to transmit the filament voltage drops to just over 9V. The best
>efficiency is around 63% (2075 VDC, .380 A and 500 watts out). Leaving
>everything else alone I then crank the filament voltage up to 10 volts and
>get 73% (2050 VDC .400 A and 600 watts out).
>
>The problem is that when I key up, the filament voltage soars to about 10.75
>volts.
>
>Now, should I run the tubes at 9 volts in transmit and 10 at standby or 10
>volts in transmit and 10.75 at standby?
>
>Thanks
>Dan
>KJ7FX
>
>
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