[Elecraft] Re: # 4472 mixer problem now???

[jerry]

Hello all,
Just took some voltage readings.
Q 22       base 1.894      emitter  1.168  collector  10.88
Z6 mixer     0 volts on all 4 pins..    it that correct???
Q21    base and emitter 0 volts  collector 11.78     ( PRE amp is not on)
D7 and D6 junction 7.24
D6 anode  7.87
Can anyone make sense of this.. Do I have a bad mixer?    Since the freq looks incorrect also.

Jerry

Below is my older post.
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New problem is on the IF amp alignment page 64 in manual.   I get just
very little hiss with headphones with the AF gain to max and can't even
hear the internaly - generated signal   I even hooked up an antenna and
could not hear any signals.      I tried tweaking  L1 and L2 to no avail...
I was afraid to tweak them to much.

I then tried hooking up the headphone output to the computer mic in ( no
display at all on line in) using  Spectorgram  and had  noise displayed but
no trace of a signal , by the way the  mic gain was in the middle.     Then
i tried tweaking L1 and L2 but could see no change.   Should I be able to
see the internally generated signal with spectrogram?

 Every adjusment on pages 60 to 63  went ok.

Just got my XG! test occilator today and put it together tonite and did a little troubleshooting.
  I have the K2 set for  7040 Khz  and the XG1 on 50uv and i am getting at the W2 jumper  a 42 mv p-p 11955khz signal (using a scope  and the internal freq counter).  There is nothing at the W3 jumper, not getting thur the crystal filter.     BUT,  should not that be a 4.9136 IF  signal? I get the same freq signal at the collector of Q22, the post-mixer amp
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jerry
n2uz at comcast.net
2004-10-28