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RE: LF: DL4YHF - F6CNI : JT9 QSO on MF.

To: "[email protected]" <[email protected]>
Subject: RE: LF: DL4YHF - F6CNI : JT9 QSO on MF.
From: Rik Strobbe <[email protected]>
Date: Fri, 31 Jan 2014 13:36:46 +0000
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Thread-topic: LF: DL4YHF - F6CNI : JT9 QSO on MF.

Hello Wolf, all,

 

my antenna is a 22m long and 11m high "lazy-L" (= marconi antenna with topload).

It is surrounded by many trees, in fact some trees act as support.

The loss resistance varies from 70 Ohm in summer to 30 Ohm in winter (if it is freezing for some days).

To that I have to add +/- 5 Ohm variometer loss.

Fortunately we have a 5 W EIRP limit on 472kHz, so any losses can be compensated by increasing power ;-)

 

73, Rik  ON7YD - OR7T


Van: [email protected] [[email protected]] namens wolf_dl4yhf [[email protected]]
Verzonden: vrijdag 31 januari 2014 14:14
Aan: [email protected]
Onderwerp: Re: LF: DL4YHF - F6CNI : JT9 QSO on MF.

Hello Andy,

Thanks for the info. That's a very nice antenna (larger than what I use here at the moment), and a base impedance of 18 - j * 560 Ohm is really impressive. When I put the antenna at DF0WD into service some years ago (total wire length ~60 meters, 11 to 15 meters above ground, and with the radial system fully intact) I thought that a resistive component of approx 26 Ohm was "good". Now its more around 30 Ohm, and before laying out two new radials (partially under the grass) it was 35 Ohm i.e. quite lossy.

Wonder what others with comparable antennas (the 'Marconi' type, or vertical wire with a lot of topload) are measuring.


Have a nice weekend,
  Wolf DL4YHF .




Am 31.01.2014 10:58, schrieb André Guyé:
Merci Wolf.
 
A nice QSO with you. I am still on QRP configuration, using a 3 Watts output TX. HI. I like very much QRP.
 
The antenna is an Inv L base loading. Total wire length is 80 meters, and the horizontal wire is 12 meters up. The feeding base impedance is ( 18 - 560 j ). It needs a 190 µH serial coil to resonate.
 
Best 73 de Andy, F6CNI.
 
 
Sent: Thursday, January 30, 2014 8:27 PM
Subject: Re: LF: France QRV - JT9 on 630m
 
Merci Andy,
SNR during your CQ call was -16 dB (in 2.7 kHz, I presume), later dropped to -25 during the QSO.
Would have been ok for CW if there had not been the qsb ;-)

Now IZ7SLZ and I5EFO in JT9-1 on qrg, both around -20 dB here.


73,
  Wolf  DL4YHF
  JO42FD


Am 30.01.2014 17:57, schrieb André Guyé:
F6CNI also be QRV this evening JT9.
 
73 de Andy
 
Sent: Thursday, January 30, 2014 5:52 PM
Subject: LF: CQ CQ F4DTL JT9 on 630m
 
Rendez vous at 2100 GMT this evening
 
F4DTL Nicolas JN18FP



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