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LF: Re: DF6NM DK7FC in CT

To: <[email protected]>
Subject: LF: Re: DF6NM DK7FC in CT
From: "Markus Vester" <[email protected]>
Date: Sat, 30 Mar 2013 13:56:39 +0100
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Jay, thanks very much for this!
 
The night before one wire had fallen off the topload again, and so I decided to refurbish the antenna yesterday. The PE insulation of the wire ("NVA-Litze", originally for battlefield telephones) had become worn and brittle over the years, and the parts where it had come off near the ends were prone to partial discharges. I replaced the whole topload (42 m total) with fresh wire, using the original double wire instead of single ones. At the top half of each leg, the two wires were split and spaced by 25 cm to increase capacitance a bit. Driving it with about 400W, I was then able to reach 1.0 W ERP for the first time, with no visible corona at 4.6A / 20kV. During the night, WSPR-15 was then sent with 4.3A (0.9W ERP) and 25% duty. At the end of a 15 minute transmission, the temperature at the inside of the litzwire loading coil had gone up to 80°C, so I seem to be limited by current rather than voltage now. Anyway it looks like the 2 dB ERP increase has indeed helped ;-)
 
Unfortunately the mast, which cannot be guyed from the east from our plot, now heavily bends under the increased weight and wind load. Today I have attempted to install a temporary auxiliary pole which apparently helps to stabilize the mast:
This adventurous construction seems to do the job but will not last - it surely won't pass neighbours' visual acceptance criteria, and I will anyway have to close the roof window as soon as it starts to rain ;-)
 
BTW Jay, on WSPRnet there were spots from both WD2XNS and W1VD - are you using two different receivers in parallel?
 
Best 73,
Markus (DF6NM)
 
 
----- Original Message -----
Sent: Saturday, March 30, 2013 12:23 PM
Subject: LF: DF6NM DK7FC in CT

Markus

Glad to see Markus make it across the pond last night ... despite less than favorable DST.

2013-03-30 05:30  DK7FC  0.137610  -30  0  JN49ik  1  W1VD  FN31ls  6099
2013-03-30 05:00  DK7FC  0.137610  -33  0  JN49ik  1  W1VD  FN31ls  6099
2013-03-30 04:30  DK7FC  0.137610  -32  0  JN49ik  1  W1VD  FN31ls  6099
2013-03-30 04:00  DK7FC  0.137610  -30  0  JN49ik  1  W1VD  FN31ls  6099
2013-03-30 03:30  DK7FC  0.137610  -31  0  JN49ik  1  W1VD  FN31ls  6099
2013-03-30 03:00  DK7FC  0.137610  -26  0  JN49ik  1  W1VD  FN31ls  6099
2013-03-30 02:30  DK7FC  0.137610  -34  0  JN49ik  1  W1VD  FN31ls  6099
2013-03-30 02:00  DK7FC  0.137610  -26  0  JN49ik  1  W1VD  FN31ls  6099
2013-03-30 02:00  DF6NM  0.137616  -38  0  JN59nj  0.5  W1VD  FN31ls  6258
2013-03-30 01:30  DK7FC  0.137610  -28  0  JN49ik  1  W1VD  FN31ls  6099

Jay W1VD  WD2XNS  WE2XGR/2

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