I was surprised to read that bulletin. Here in the Northeast, their
signals have been very weak for the most part, especially on 30-15m
(no copy on 10 or 12), but they hear well.
Barry W2UP
On 3 Oct 2005 at 6:25, w0mu wrote:
>
> Bill,
>
> I wrote to one of the relay stations with similar questions. Usually
> in Colorado KH6 boom in on 15 and 20m even when condx are poor. Maybe
> the arrays are fixed over the pole which would put the us of the side.
> If I get a response I will pass it along.
>
> Mike W0MU
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Bill Jackson
> Sent: Monday, October 03, 2005 6:09 AM To: towertalk@contesting.com
> Subject: [TowerTalk] K7C - One-Way Propagation?
>
> Towertalk Gang,
>
> Here is an excerpt from one of the recent K7C dx'pedition bulletins,
> regarding poor signal quality they appear to be experiencing on their
> end:
>
> "Let's start with a technical consideration of which you should be
> aware. As you already know, we are using vertically-polarized antennas
> very, very close to salt water and with large radial fields. This
> makes our signal launch angle very, very low - quite a bit lower than
> most horizontally-polarized antennas on dry land. As a result, the
> K7C signal has been reported to be very loud on the receiving end.
> This doesn't mean, however, that you are just as loud here. All it
> takes is a couple of extra "hops" from a higher launch angle and your
> signal will change from an easy-to-work S5 to being undetectable. The
> K7C team has observed a number of occasions when it is obvious that
> you can hear K7C easily, but on our end the pileup is only an
> unworkable S-1 grumble. This is most pronounced at the beginning and
> end of an opening so you may be hearing us long before or after we can
> hear you. Marginal openings on the paths to Europe, the Middle East
> and Northern Africa may be enti rely "one-way" - incredibly
> frustrating for you to have K7C be as clear as bell, but not hearing
> the most important DXer of all - you."
>
> Does this explanation make sense? I would think that an antenna with
> a high angle of radiation on transmit would also favor signals with
> high arriving angles on receive. The amount of signal attenuation on
> a signal arriving at a low angle at the station with the antenna
> transmitting with a high angle of radiation should be equally
> diminished. Therefore the station with the horizontal antenna over
> dry land should have trouble hearing hearing K7C as well.
>
> What am I missing here?
>
> Even though I have managed to work them on both 80 and 40m, they have
> never had what I would call a LOUD signal, compared to what I often
> hear from KH6 land.
>
> 73 de Bill
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
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>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
--
Barry Kutner, W2UP Internet: w2up@mindspring.com
Newtown, PA Frankford Radio Club
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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