Pete:
?
I have modified two TRA-921's to work on 60M.?
This is not a clarifier, but it is very simple to do.? The MHz knob on the
radio selects a crystal oscillator for each 1 MHz band from 2 to 7 MHz.?
The PLL synthesizer does the 100 KHz, 10 KHz and 1 KHz selection.? I simply
found the crystal for the 5 MHz band and put a 12 pf capacitor in parallel with
it.? You may have to "tweak" this value a bit to get it just right.? I
did this by selecting the capacitor from several on hand.? This offsets the
entire 5 MHz band down 500 Hz, but it will take you less than 15 minutes to put
the mod in the radio.? This mod?will require you to tune to the next
higher 1 KHz position on the dial, while on 60M.
?
I thought about replacing the desiccator with a pot
and put a?varicap diode?on the reference oscillator,?but I have
not got around to it yet.? This would reduce the frequency stability a
bit.? It is very good now.
?
This radio also have very good true AM modulation
and?a true AM detector along with a good AM IF filter.??For those
who?check into any of the military?radio AM nets, it is?better
than most packsets.
?
Good luck,
?
Jim Butch
wb8cdx
?
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