[Elecraft] Re: L1 and L2 Alignment Problem

[Carl J. Denbow]

I just checked, Roy, and my problem appears to be on all bands.  The receiver, however, seems to be working just fine and I can listen to SSB and CW signals with good selectivity and sensitivity.  I'm checking over the circuit board for the kinds of problems you suggest, but so far have not found any.

73,

Carl
N8VZ


-- 
Carl J. Denbow, n8vz at qth.com on 6/2/2004


On Wed, 2 Jun 2004 09:25:57 EDT, Unifiedtx at aol.com wrote:
> Hello Carl,
> I have just gone through the same problem you seem to be going
> through.  If you have output on all other bands except 40, and if
> you have ears on all bands except 40: you have a problem in the 40
> meter Band-Pass Filter section.  More specifically, you probably
> have a problem with C4, C5, C6, C7 or C8.  Check very carefully for
> hairline solder bridges or cold solder joints.  Also check to see
> that a wrong component has been installed, ie. a 100J cap has been
> installed instead of a 101J for the 100 pFd cap as an example. 
> Take the center conductor of your antenna and see if you get full
> received output at the D7 diode (cathode) junction.  Also put a
> jumper wire from K1 pin 4 to W6 bypass with the antenna connected
> to J4.  This lets you know it is not a problem with K1 and it also
> confirms the problem is definitely in the 40 meter Band-Pass
> Filter.  Also, make sure your solder joints are good at L25 and L26
> in the Low-Pass Filter.  Pay close attention to the three solder
> pads at J15.  Make sure C6 is not grounding out to pin 2. 
> In my case I just had a bad C7 and had to replace it.  All who
> contacted me about my problem said to concentrate on C6 as the
> first order of the day and go from there.  Gary Surrency at
> Elecraft reminded me that the problem is almost never with the
> latching relays.  He warns that the relays should never be removed. 
>  Good luck.  Let me know if I can assist you further since I have
> just been there.  Roy Morris  W4WFB  K2 #4270, K2/100 #2225