>
>
>I recently try using my SB-220 on 15 and 10 meter trying to break a pile
>up and found it was only putting out only 200 watts Max regardless of grid
>drive and up to 500 ma Plate Current( saturated output with 20 watts
>input) . In looking at the Plate HV Voltage, I am only seeing 1500 VDC (
>shouldnt it be @ 3000 VDC ??? )on standby unloaded. It looks like my
>Voltage Doubler has failed somewhere. It is wired for 110 VAC and there is
>no noticable damage components and wiring inside the unit.
>What component would be the likely candidate to replace ???
>My DVM is only rated for 1000 VDC so how do I go about troubleshooting the
>voltage doubler to find the bad part or problem ???
>
Measure the R of the three 4.7M? resistors to see if the voltmeter is the
problem. If you have normal ouput on 40m, my guess is crispy-crittered
bandswitch contacts on 10m and 15m.
.
good luck, Jeff
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
end
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|