----- Original Message -----
From: "Neil M Califano" <[email protected]>
To: <[email protected]>
Sent: Sunday, September 18, 2011 1:47 PM
Subject: [Drakelist] Crystals and audio
Can a frequency crystal affect the audio quality?
Depends on where it is. If the crystal that generates a
local carrier for either generation or detection of SSB
changes it will shift the sidbands with relation to the
filter passband which can definitely change the audio. If
the crystal simply generates the transmitting carrier
frequency it probably does not. Of crystals which are part
of a filter will cause some change, maybe small or maybe
large, depending on how much they change.
A lot of the problems we are faced with when dealing
with equipment like Drake or Collins is that they were
designed using parts with perhaps a ten year liftime and are
now anywhere from thirty to sixty years old. We often expect
this stuff to work just like it did when it came out of the
box new. Pretty often it does but I think that's a bit of a
miracle.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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