[R-390] Crystal substitution puzzle

[David Wise]

It's a hack to save money.  These are not CR-36/U.
They're not even HC-6/U.  They have wire leads,
and I made up a little slip of vectorboard the
size of an HC-6, soldered the crystal to it,
soldered wires to it that worked like pins,
and plugged the result in.

Some of the tech info talks about adding
a coil across the crystal to compensate
the holder capacitance; this info always
says this increases the frequency.  If I
get a chance to try it, I'll report back.

Dave

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Flowertime01 at wmconnect.com
Sent: Friday, May 15, 2009 4:01 PM
To: r-390 at mailman.qth.net
Subject: [R-390] Crystal substitution puzzle

Fellows,

OK so these stock crystals want a series circuit and the R390's offer a 
parallel circuit. What do we need to add to the crystal to get it closer to the 
needed frequency?

Or is it still cheaper to just buy the right ones to start with.

Who is a good new crystal supplier that we should all glum on to and order 
from hoping to keep them in business?

Roger AI4NI
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