[VHFcontesting] 6m, 2m, 70cm EME
David Olean
k1whs at metrocast.net
Sun Sep 29 19:26:30 EDT 2024
Hello Ev
I have been playing on 432 and 222 MHz of late. It seems that a power
level of 100 watts will allow you some limited success on 432, but only
with the most well equipped stations. I would strongly suggest rapid
polarity adjustments. That is easy with a single long yagi. The other
suggestion would be to have a very good and selective front end. A big
copper cavity in front of your preamp is probably needed if you are
going to travel to different spots. I can almost guarantee that strong
digtal TV stations on the low end of the UHF TV band will kill most
preamps. I have had serious trouble both on 222 and 432 that really
compromised my hearing ability. After the re packing of the UHF TV
channels, there is probably a multi megawatt TV station nearby that will
kill your 432 front end. The end result is that digital noise gets into
the preamp and s/n ratios go South!
I tried today with KB7Q who was portable in Hawaii. I have a mid level
station and had a bunch of trouble due to poor EME conditions. I used 4
X 12 el with polarity rotation. Gene had a single long yagi (9wl) and
450 watts. Polarization was quite diffused much of the time, with V and
H not being much different. It made Gene's signal very difficult to hear
even with his 450 watts. I am sure a better day would have been easier,
but you have to realize that many days will be less than optimum.
I think 432 is your best bet with low power. I have tried 100 watt QSOs
on 222, but success is fleeting. I have done it with my four big yagis,
but it is barely possible. I am sure that 144 is even worse unless you
are talking about 2 or 3 "super stations". Good luck.
Dave K1WHS
On 9/27/2024 7:47 AM, Ev Tupis via VHFcontesting wrote:
> Of the 6, 2, and 70cm bands (those that are most likely to be in a modern HF+ radio), which band has been shown to support EME with the least overall ERP? I'm thinking "portable EME" where it isn't possible to transport big antennas or a generator to have a kw amp. :-)
>
> Assume that this portable station would target QSOing with only the "top tier" of well equipped DX stations.
>
> I'd be interested in only recent experience rather than "back in the day". Also interested in both CW (human decode) and FTx (machine decode) modes.
> How little power and antenna (ERP) has been successful in making EME contact(s) and on what band/mode?
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