[R-390] 17.000 Mhz Crystal

[Roger Ruszkowski]

Gordon,

Yes you can swap the first mixer crystal with the second mixer crystal 
just to check that the second mixer crystal is the problem on
14 and 31.

I have no idea how far off frequency it will be.

You may get lucky and it will work very well.

Back when we just had two many parts on hand and
never had to resort to this level of maintenance.

I always had 400 plus receivers in the building and more than
one of them was not in exact use a any given hour. I could
always find an exact part to swap. 

As this is a rebuild, look for some crud in a socket pin.
a shorted trim cap wire. But first just plug in a different crystal.

Thunk the crystal a time of two as it may have crud inside.

Crystals do go bad and is the most likely problem.

Just resetting the crystal a time of two in the socket may clean
up the contacts.

If you have a scope, you do not need an exact crystal.

Swap any crystal within reason 15 - 20 Mhz into the
socket and look for a signal with the scope on the RF
mixer tube pin. 

Roger AI4NI





Well, I finally have my R-390A re-assembled.
I turned it on today and so far looks and works great EXCEPT for 14 and 
31 Mhz.
After some quick checks, it appears my 17.000 Mhz (Y-412) Crystal is bad.
Does anyone have one to sell ?

Thanks,
Gordon
N6WK


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-----Original Message-----
From: Gordon <gordon at n6wk.com>
To: R-390 <R-390 at mailman.qth.net>
Sent: Sun, May 12, 2013 7:54 pm
Subject: [R-390] 17.000 Mhz Crystal


Well, I finally have my R-390A re-assembled.
I turned it on today and so far looks and works great EXCEPT for 14 and 
31 Mhz.
After some quick checks, it appears my 17.000 Mhz (Y-412) Crystal is bad.
Does anyone have one to sell ?

Thanks,
Gordon
N6WK


______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
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Please help support this email list: http://www.qsl.net/donate.html