I just had a chance to measure my noise level during a widespread power
outage. On 20 meters, it's 5 to 19 dB lower than normal, depending on
direction. So, if you're in a really quiet location to my west, you're
going to need 19 dB more power to get above my noise level that I do to
get above yours. Either that, of 19 db of non-recriprocal propagation.
Unless I can track down that big noise source.
(I'm in the middle of the city, surrounded by overhead power lines.)
73,
Scott
On 1/26/2023 1:40 PM, Gerry Hull wrote:
Interesting discussion.
As many have said, the local conditions, qrm, qrn, etc play a lot into
the equation.
From the arctic, it is usually pretty quiet, so I can hear a lot more than
I can work.
Also, if there is any aurora, it makes conditions one way -- I hear
perfectly but cannot get out.
In NAQP CW, I was on from VY1AAA on all bands, with 100w. The only antenna
that worked at all was the full-size 1/4-wave 40m vertical.
It has the most signal "capture". Of course, that meant the most
productive bands were 40 and 15, but even with a tuner 10 was great due
to conditions.
With a small station, it is really important to know when you can call in a
pile and work someone. I passed by many because I knew I would
sit there and call forever. However, that is not universally true: some
ops are just awesome. One call for 8P5A even though he was 339 to me.
73,
Gerry VY1AAA (W1VE)
On Sun, Jan 22, 2023 at 7:52 AM Barry Jacobson<bdj@alum.mit.edu> wrote:
Hi guys, it seems that in a contest like NAQP where presumably almost
everyone is running the same 100 W power, you should be able to hear the
other guy at the same level he hears you. Even if the other guy has a
$25,000 dollar beam, and you have a simple 10 foot random wire, the
weakness in your transmission ability will also weaken your received signal
just as much in the other direction. So if you can hear him, it guarantees
he can hear you. (Unless one or both of you has separate receive and
transmit antennas, or the receivers you are using are of very different
quality.) Does that make any sense?
Barry WA2VIU
--
Barry Jacobson
WA2VIU
bdj@alum.mit.edu
@bdj_phd
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Scott K9MA
k9ma@sdellington.us
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