KX1: need some help...

[Tom Pallen]

I'm having a number of problems with KX1 options and I'm hoping to
get some guidance from the reflector participants.

The KX1 went together w/o a hitch. Performance matched my Elmer's old
rig and life was good. Then came the 3080 option that required
re-work. I followed the instructions and now there are problems.
    * Can't Rx any signals at all. Not even WWV. But the Elecraft
signal generator can be heard on it's specific frequencies at both 50
and 1 uV.
    * U6 can cook eggs on Rx!!
    * I checked the DC Voltages per pages E-5 and E-6 and found:
        * U1 pin 14 at 5V not 0.0
        * U1 pin 15@5V not 0.0
        * U2 pin 14 at 2.5V not 0.0
        * D3 Anode a 11.7V not 9.0
        * Others not checked because they are hidden by the 3080 board.
I'm open to any and all suggestions.

Thanks,

Tom (taking the test(s) later this month) Pallen  
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[Don Wilhelm-4]

Tom,

If U6 is getting hot, check for a short to ground at pin 1 or pin 2.  
Both these pins must not have a DC path to ground.  The DC voltage on
both pins 1 and 2 should be close to 1.4 volts.  You can reach the pins
of all the components in the KX1 from the bottom of the board.

73,
Don W3FPR

Tom Pallen wrote:

> I'm having a number of problems with KX1 options and I'm hoping to get
> some guidance from the reflector participants.
>
> The KX1 went together w/o a hitch. Performance matched my Elmer's old
> rig and life was good. Then came the 3080 option that required
> re-work. I followed the instructions and now there are problems.
>    * Can't Rx any signals at all. Not even WWV. But the Elecraft
> signal generator can be heard on it's specific frequencies at both 50
> and 1 uV.
>    * U6 can cook eggs on Rx!!
>

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Subscriber Info (Addr. Change, sub, unsub etc.):
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Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com