Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Bill -
The "original" crystal color is indicated by the letter at the end of
the serial number. Red, Blue, Green and sometimes Yellow. The "actual"
crystal color is determined by a stripe of paint on the side of the
crystal itself. These two are nominally the same, but some have been
changed over the years, so it's best to check the paint stripe!
The "color" only indicates the "long term" stability of the Transceive
Align. If your units are not transceiving on the same frequency, you
need to do the Transceive Align procedure described in the T-4X(any)
manual. When this procedure is done correctly, the units will be
exactly on the same frequency. When room temperature varies, receivers
and transmitters heat and cool, and crystals age, crystals with the same
color code tend to "drift together", therefore staying in alignment.
Crystals with different color codes may drift in the same direction at
different rates, or even drift in opposite directions, causing the two
units to go out of alignment.
Keep in mind that we are talking about frequency changes of 30 - 60 Hz,
which is a LOT for an SSB signal, but negligible for any other mode.
Again, this is _ONLY_ of concern for transceive operation, and has no
effect on any other mode.
73, Garey - K4OAH
Atlanta
Drake 2-B, 4-B & C-Line Service Data
<http://www.k4oah.com>
William Ellis wrote:
Garey,
On this discussion of color-coded crystals for the R-4B/T-4XB combo,
I purchased my pair at different times. I know I have the offset when
I transceive. How do I check what I have. My question is to satisfy my
curiosity only, I run split 100% of the time.
Thanks,
Bill Ellis, WB9CAC
Valparaiso, IN
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