I believe this mod does in fact exist. I know for sure because I had
one on my old Omni V. The mod would definitely be a resistor change in
the ALC circuit.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com
On 11/11/2014 5:05 PM, Neil Martinsen-Burrell wrote:
With the upcoming QRP Fox Hunt season (one of my favorite weekly operating
opportunities) I am interested in the possibility of using my main station
rig at QRP power levels. My QRP radio is an HB-1A with RIT that does NOT
remember the offset settings when RIT is switched off and then on. This
means that it take a lot of fiddling to listen to a split pile-up to find
the station currently being worked. I would prefer to use the Omni with
its separate offset knob and a RIT on/off switch so that I could easily
switch between the offset and non-offset frequencies.
There are google mutterings from the late 1990s in this list's archives
about a mod that might change the range of the ALC knob from 0-20 instead
of 25-100 watts. Does anyone know if such a mod exists as more than a
rumor? On my previous Kenwood TS-520SE, there was an external ALC pin that
could be driven with a negative voltage to reduce output power. Is there
something similarly simple for the Omni 546B?
I can see from the schematic that R21 on the 80743 low level driver
controls the effect of the ALC control pot, but it seems like that isn't an
easy solution to getting down to QRP power levels, at least without some
fiddling to figure out what value would give the appropriate minimum and
maximum power levels.
Thanks in advance for any help you can offer.
-Neil KD0UKC
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