John,
240 ma is quite normal for receive current on a K2.
However, I just measured the resistance from RF board U6 to ground on 2
K2s and found the normal resistance is about 240 ohms.
I also tried checking the current draw when the dit key is held down
(power set to zero and the keying input set to HAND) - the current
increase is a bit over 20 ma., so I can't explain why you are seeing
only 160 ma - unless your keying input is set to paddles, and then it is
possible that the changing display numbers are not settling fast enough
to give you a valid reading.
73,
Don W3FPR
John wrote:
> Hello all K2 users.
> I'm trying to track down a problem on the rf board.
> Pin 8 of U6 shows a resistance of approx 50 ohm when it's supposed to
> be greater than 100 ohms.
> I've gone ahead and assembled the rest of the kit and I am not happy
> with the amount of current
> it draws, approx 240 mils.
> I notice that when listening to WWV at 10 megs if I hit the "dit" key,
> the current drops to 160 mils.
> Anyone else see that?
> I wonder what part of the circuit is dropped when the key is closed
> and if it's the 8B line, (where I'm
> seeing the low resistance.)
> I know I can use it the way it is but it's really not what I'd like to
> use if it draws more current than it's
> supposed to.
> Don and Gary have offered advice and I wonder if anyone else could
> shed more light on
> locating the problem of low resistance.
> Nothing is getting overly warm, that I can find.
> Thanks.
> John.
>
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