This morning, I decided to attempt a TCXO alignment on the ArgoV....it's a very
simple and straightforward process. Please review
these instructions in their entirety prior to proceeding with the first step
below.
1) Remove the 5 Phillips-head screws from the case (one on top, four on the
sides). DO NOT remove the cover at this time.
2) Power-up the Argo V and let it warm-up for one or two hours. While you're
waiting for the unit to warm-up, locate a small
jeweler's screwdriver and have it handy.
3) While you're waiting for the warm-up, tune to WWV at 15 or 20 MHz. Try to
use 20 MHz for best accuracy at all lower frequencies.
If you can't get a decent 20 MHz signal, use WWV at 15 MHz.
4) Also while waiting, go to the CW mode, and menu though the front panel keyer
button until the side-tone becomes audible. You
should now hear WWV beating against the Argo's internal CW side-tone. You may
leave it this way during warm-up.
5) After the warm-up period, remove the top case cover. You should have
removed the top cover screws in Step 1.
6) The TCXO module is immediately recognizable as a rectangular silver metal
can on the top circuit board. It is located near the
center of the circuit board...just a bit to the right. The TCXO is designated
as U9.
7) You'll see a small straight-blade screw-adjustable capacitor visible through
the TCXO's metal case.
8) Adjust the TCXO's capacitor in small increments with a jeweler's
screwdriver until you have attained "zero-beat" against the
sidetone oscillator. * Note: the capacitor's stator appears to be at ground
potential and there's no need for an insulated
screwdriver. As the screwdriver is removed, zero-beat should not change. *
9). Replace the top cover using its 5 screws that were removed in Step 1.
Alignment Complete.
DISCLAIMER: PROCEED AT YOUR OWN RISK AND COMFORT LEVEL. No representation of
warranty or fitness is offered concerning the
results, accuracy, nor safety of this information and accordingly, anyone using
this information agrees to indemnify, defend, and
hold me harmless from any and all actual, consequential or incidental damages
that may result from your reliance on this
information.
-Paul, W9AC
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