At 11:55 21.05.1998 EDT, km1h@juno.com wrote:
>
>On Wed, 20 May 1998 17:13:55 Scott Townley <nx7u@primenet.com> writes:
>>Clarification: Low out on 10m is ALSO low DC in on 10...plate voltage
>>nominal but Ib quite a bit low. Maybe this is typical of low output
>>on
>>10m, but in case that's the key indicator...
>
>Low DC in??? Or do you mean RF??
>If the input network has a high VSWR to the exciter or is just a poor
>design the output will suffer.
>An old clunky WW2 mica .01 type coupling cap to the filaments could also
>be quite lossy at 10M, etc.
>
>73 Carl KM1H
>
No, just low DC in. The particulars:
Eb=2600W typ. Eb=2500V
Ib=440mA typ. Eb=630mA
Pdc=1140 typ. Pdc=1550W
Po=590 typ. Po=1000W+ (I only have a 1000H slug)
Pin=90W for rated grid current Ic=240mA.
Coupling caps to filaments are ceramic disc .01uF
I wish I had an HV o'scope probe so I could see if I was swinging the plate
voltage enough.
It behaves as if there's additional RF resistance in the output circuit
somewhere...but the tank is a B&W850 and the RFC B&W800, so the components
shouldn't be suspect (right?)
------------
Scott Townley
nx7u@primenet.com
------------
Collector of:
Stoddard Aircraft EMI/RFI receivers and accessories
Big Parts for that Big Linear Amp
70's era RF test equipment HP/GR/Tek
Radio-related technical reference material 1940+
...anything else that will keep me off the streets at night
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