[Elecraft] swr

Sat Nov 22 10:48:00 2003

Syd:
 With all connections to the K2 disconnected, what ohm readings do you get 
between pins 12-18 of U2 and ground and between 12CTRL and ground?

best wishes,

dave belsley, w1euy

--On Saturday, November 22, 2003 10:31 AM -0500 syd smith 
<[email protected]> wrote:

> I have had K2/100 #3324 on the air for about 6 months when the swr went
> out of sight and of course it would trip out of transmit.  After running
> around in tight circles looking into the antenna, I hooked the K2 up to
> the dummy load and read an swr of greater than 2.  So I went back to the
> SWR Bridge Null adjustment procedure with the following resuts: 1.  C1
> has little if any effect.  Measuring voltage at U5 pin 1 its about 17 mv
> and varies about a mv with C1 tweaks. 2. I can achieve 1:1 if I tweak R27
> to about the end of its range rather than the mid range where it belongs.
> 3.  But at any power  greater than 1 watt the K2 trips out of TUNE after
> about 3 seconds, displays ELECRAFT for a second, and then the normal
> freq. display. 4.  The swr varies with power i.e. if adjusted for 1:1 at
> less than a watt, it rises to 2:0 at 5 watts.
>
>   I tore it apart and reheated all connections associated with the bridge.
>
> Any comments would be greatly appreciated.
>
> Syd WB4W
>
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----------------------------------
David A. Belsley
Professor of Economics