[Elecraft] Yet another question...

Sun Jun 8 22:45:01 2003

Hi Jason,

These readings are consistent when the diode is already in the circuit.
When you reverse the probes, there are some sneak paths for current from the ohmmeter, so the apparent resistance is about the same
in both directions but current is flowing through some other components rather than the varactor diode.

If your meter has a diode voltage measuring scale, try that. I read 0.63V with the -probe (black) on D22 and 1.85V with the +probe
(red) on D22.  However, the resistance didn't change much, -13K and +14K.

If you change the ohm scale on your meter, you'll probably notice a change in the readings too.

Your diode is probably ok.

73/ Bob - AG5Q

----- Original Message -----
From: "Jason Hissong" <[email protected]>
To: <[email protected]>
Sent: Sunday, June 08, 2003 7:48 PM
Subject: [Elecraft] Yet another question...

> Hi guys,
> My question deals with D22 on the RF board.  It is an MV149 varactor.  I
> checked all the other ones and they say about 16.00 kOhms one way, and
> infinity the other way.  However, D22 says 22.7kOhms both ways. Is it
> bad?  How does one tell if it is bad?
>