>Dear Sam, et. al.,
> The high voltage is read from a voltage divider R3 and R4 which go from
>the high voltage wiring to ground. The connection between R3 and R4 is
>wired to terminal 11 on the meter switch.
> My first guess is one of the three resistors making up R3 has opened up.
>R3 is made up of Three 4.7 MegaOhm resistors in series. It may just be time
>to replace those three resistors. The other possibility is that R4 has
>shorted to ground so both sides of the meter switch are to ground in the HV
>position. R4 is supposed to be 15KiloOhms. Since there is over 2000 volts
>HV, I would use three 2-watt resistors to replace the existing R3.
Good advice, George. However, 2w film-type resistors should be used. I
would also add 3A glitch protection diodes across the 200uA meter
movement.
>
>
>----- Original Message -----
>From: "Samuel Ramac" <samuel_ramac@hotmail.com>
>To: <amps@contesting.com>
>Sent: Saturday, April 05, 2003 7:05 AM
>Subject: [Amps] SB-200 HV meter problem
>
>
>> I have another SB-200 question.. (Sorry for all the questions, just got
>this
>> amp and is my 1st.)
>>
>> When I measure HV my meter does not do anything. Except for this
>problem,
>> the amp seems to work well (600W on most bands). The meter seems to work
>> well indicating the plate current, SWR, grid current, and relative power.
>>
>> Any ideas? Thanks
>>
>> Sam N2MXY
>>
>>
>>
>> - - - - - - - - - - - - - - - - - - - - - - - -
>> Samuel C. Ramac
>> samuel_ramac@hotmail.com
>>
>>
>>
>>
>>
>>
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>>
>
>
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>
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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