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[Amps] al80a

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Subject: [Amps] al80a
From: Ian White, G3SEK" < (Ian White, G3SEK)
Date: Sat, 3 Aug 2002 15:31:25 +0100
2 wrote:
>>While rooting around inside the SB-1000, I checked the carbon resistor
>>in the paralytic choke... good as new.
>**  What was the measured resistance? //   I have found that intermittent
>vhf parasites are so brief they can damage the element of a carbon-comp
>resistor without exhibiting damage to the moulded case.  Thus, a
>new-appearing carbon-comp resistor can have several times more ohms than
>its specified value.
I'm aware of that, so I unsoldered the resistor and measured the 
value... good as new.

>>The RF choke and bypass caps were there as standard. Since the screwy
>>meter readings were only on one band (the lowest) I put it down to RF
>>rectification rather than purely threshold voltage.
>**  In your opinion, is 88-ohms of XC an acceptable bypass for c. 1A-rms
>of RF current?

There are thousands of amps, of many different kinds, that seem to work 
fine with 0.001uF. That evidence has a large influence on my opinion.

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                           'In Practice' columnist for RadCom (RSGB)

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