[TowerTalk] NCDXF Vertical Performance @ 500 Feet

Ignacy Misztal no9e at arrl.net
Wed May 11 14:50:51 EDT 2022


Recently the propagation has improved and high and low beams have a similar
performance whereas before there was a 2 S difference.
Enjoy the sunspots.
Ignacy

On Tue, May 10, 2022 at 7:47 PM Tony <73guddx at gmail.com> wrote:

> All:
>
> I've been monitoring the NCDXF beacon 4U1UN on the 20 meter band using
> various remote receivers in Europe as well as other parts of the world
> and I've noticed that the performance of the beacons R5 vertical was
> being better than expected.
>
> In some cases, the beacons signals came within 1 S-unit of other Yagi
> equipped stations here in New York and New Jersey including my own. It
> most cases it was within 2 S-units. I believe the remote SDR receivers
> have calibrated 6db per S-unit S-meters so the readings should be fairly
> accurate.
>
> I once had the same R5 vertical used by 4U1UN as well as other home-brew
> verticals at my station and they rarely came within 3 S-units of my
> SteppIR Yagi at 70 feet. My guess is that there must be some advantage
> to having the beacons vertical mounted on top of the U.N. building some
> 500 feet above the ground.
>
> It's interesting to compare your antenna performance to NCDXF beacons if
> you live fairly close to one of them. Here's a short list of remote
> receivers with low noise floors:
>
> New Zealand: http://kiwisdr.owdjim.gen.nz:8073/
>
> Austria: http://kiwi.oe9.at:8074/
>
> U.K.: http://norfolk.george-smart.co.uk:8073/
>
> Tony -K2MO
>
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