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Re: LF: MF propagation

To: <[email protected]>
Subject: Re: LF: MF propagation
From: "Graham" <[email protected]>
Date: Wed, 26 Jun 2013 22:32:52 +0100
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Or the  Garden path  :-,)

Sent: Wednesday, June 26, 2013 7:19 PM
Subject: Re: LF: MF propagation

.. you should replace the stainless steel wire with an aluminium wire...
lighter and with lower losses... in this way you could improve the signal and I'm sure that Markus will listen to you also via long path!
 
.... .. .... ..
 
73 Marco IK1HSS
----- Original Message -----
Sent: Tuesday, June 25, 2013 9:14 PM
Subject: Re: LF: MF propagation

Hi Eddie,

Yes and it is not new and it has all been done in the past :-)

The feeder is 10mm diameter stainless steel. I guess it takes at least 300A before it melts :-) So the limit would be the withstand voltage of the ceramic isolator, even on MF :-)

73, Stefan

Am 25.06.2013 22:50, schrieb g3zjo:
Hi Stefan

Did you look to see if your feeder had taken one hour to melt? :-)
You know that WSPR's auto reporting is of no use at all and the quick QSO Mode 599 imi 599 is the preferred method.

73 Eddie

On 25/06/2013 20:56, Stefan Schäfer wrote:
MF,

I just saw this:
Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
 2013-06-25 19:48   DK7FC   0.475690   0   -1   JN49ik   1   IW4DXW   JN64bw   563   151 
 2013-06-25 19:42   DK7FC   0.475689   -2   0   JN49ik   1   IW4DXW   JN64bw   563   151 
 2013-06-25 19:36   DK7FC   0.475690   -2   0   JN49ik   1   IW4DXW   JN64bw   563   151 
 2013-06-25 19:24   DK7FC   0.475690   -8   -1   JN49ik   1   IW4DXW   JN64bw   563   151 
 2013-06-25 19:18   DK7FC   0.475690   -8   0   JN49ik   1   IW4DXW   JN64bw   563   151 
 2013-06-25 19:12   DK7FC   0.475690   -9   0   JN49ik   1   IW4DXW   JN64bw   563   151 
 2013-06-25 19:00   DK7FC   0.475690   -17   0   JN49ik   1   IW4DXW   JN64bw   563   151 
 2013-06-25 18:54   DK7FC   0.475689   -23   0   JN49ik   1   IW4DXW   JN64bw   563   151

I find it interesting to see that the propagation on 630m between JN49 and JN64, just 563 km, changed so rapidly and consistant from a non-decode to an SNR of 0 dB, i.e. by about 30 dB in one hour!

At EA2HB we can see now daily when the band opens from DL to EA and when it closes. A really useful software!

73, Stefan/DK7FC

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