Marshall, I had the same problem here. All the low VHF band s used 28
MHz as the IF, while the bands above 432 (all seven of them) used 144 as
the IF. Having a M/M setup with an 8877 pumping out 1500 watts on
144.185 caused big problems with the IFs. We migrated all the MW IFs to
145 MHz to avoid the problem. We also changed the low IF to 29 MHz for
the same reason. You could hear the 28 MHz IF signal from another band
when all of them were running at once. We even moved the 144 tower from
10 feet away from the building to 250 ft away, just to reduce the rock
crushing level of the fundamental signal. It is so much easier when you
are a single operator!
I have stowed the 222 array for the winter. Hopefully, it will still be
in place come Springtime!
Dave K1WHS
On 12/22/2021 10:02 PM, Marshall-K5QE wrote:
Hello to all VHF ops....I have 5 stations all using the 28MHz IF
frequency. In the Sept contest, when everyone was on FT8, the IF
radios were all on 28.174MHz.....AAAAAAaaaaaaaRGH! We try very hard
to keep everything on second sequence, but sometimes you just can't do
that.
When I sent my 222 MHz transverter in to Q5, I asked if it would be
possible to change the IF to 21MHz. They did not see any great
problems, so they did just that. Now, the 222 station does not
interact with the other stations....most especially the 2M station.
We have a very low duty cycle on 432, so the interference between 2M
and 432 is minimal. My solution may not be for others, but it seems
to have stopped a lot of problems here.
Everyone is REQUIRED to have a great holiday season....
See you all in Jan.....
73 Marshall K5QE
On 12/22/2021 9:44 AM, Terry Price wrote:
Hi Mike,
We ALL WISH someone would make a 222 multimode rig but no one does
anymore.
Yaesu had the FT736R which had a 222 module for it and it worked
decently.
Icom had their IC-375 which matched their 575, 275 and 475 but *IF*
you van
find one they are stupid expensive. Your best bet still is a DEMI
(Q5Signal) transverter which requires a 10M IF. I believe they still
have a
high power version which is 50ish watts. There are Larcan 222 kw amps
still
floating around.
Terry Price - W8ZN
Directive Systems and Engineering
703-754-3876
On Wed, Dec 22, 2021 at 10:18 AM Mike Smith VE9AA<ve9aa@nbnet.nb.ca>
wrote:
I asked this question probably close to a year ago but didn't get
much of a
reply..or at least to my recollection not a whole lot I could use.
What are you guys using for radios + amps on 222?
Antenna is no problem. I can build (or even buy) a small 222 yagi.
Rig is a little tougher. I'd rather not go to a qrp transverter for a
couple reasons:
Messy. Ties up a lot of desk space. Still would need an amp. Where
do I
put
it?
Ties up an HF radio and my shack is REALLY small...I already have 2
radios
+
2 amps for HF (SO2R) and a separate
backup radio for same, which performs double duty on 2m (IC-746).
Also an
amp for 6m. See my qrz.com profile
and know that I really don't have much real estate.
Does anyone make a 50w-100w 222 radio? (Ideally this is what I
need)..better
still a 144/222/432/1.2 gig 100w Rig.
Probably what I need does not exist !
I do like reading all these 222 msg's though.
Keep up the good work fellas.
270miles NE of FN43.."at the edge of the VHF/UHF universe, even
compared to
Dave/Paul/Bill in Maine"
Cheers
Mike VE9AA FN66na ~660'ASL
Mike, Coreen & Corey
Keswick Ridge, NB
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