From: "Clemens Paul" <cpaul@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
References: <D98C1CCC49324084BCF225E22F521809@DELL4> <1UTCTNxG9H.5T3bfQF3xD0@optiplex980-pc> <9C9C8088-AD45-4DDF-BD7E-66D13F0D835C@md.metrocast.net> <CANA3B6VBpQ0G92wmOniO3GvedBbaOoBuMuFPW1Fs743B8VCvpw@mail.gmail.com> <5C4B1BD5.6010404@posteo.de>
In-Reply-To: <5C4B1BD5.6010404@posteo.de>
Date: Fri, 25 Jan 2019 18:07:01 +0100
Message-ID: <8558A6E06BEB4E7D8AE25FBB1D0399DF@Clemens0811>
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Subject: LF: RE: TXing WSPR/MF on an indoor loop
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Hi Stefan,

so far I seem to be the only spotter.
73
Clemens
DL4RAJ 

2019-01-25 16:58   DK7FC   0.475683   -23   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:52   DK7FC   0.475683   -21   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:46   DK7FC   0.475683   -24   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:40   DK7FC   0.475683   -25   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:34   DK7FC   0.475683   -18   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:28   DK7FC   0.475683   -25   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:22   DK7FC   0.475683   -21   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:16   DK7FC   0.475683   -21   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:10   DK7FC   0.475683   -18   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 16:04   DK7FC   0.475683   -21   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 15:52   DK7FC   0.475683   -20   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 15:46   DK7FC   0.475683   -20   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 15:40   DK7FC   0.475683   -20   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 15:34   DK7FC   0.475683   -19   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 15:28   DK7FC   0.475683   -23   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 15:04   DK7FC   0.475683   -23   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 14:58   DK7FC   0.475683   -23   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 14:52   DK7FC   0.475683   -24   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 14:46   DK7FC   0.475683   -22   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 2019-01-25 14:40   DK7FC   0.475683   -21   0   JN49ik   0.01   DL4RAJ   JN68kj   326   109  
 

>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org 
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC
>Sent: Friday, January 25, 2019 3:23 PM
>To: rsgb_lf_group@blacksheep.org
>Subject: LF: TXing WSPR/MF on an indoor loop
>
>Hi MF,
>
>A few days ago i took some RF litz wire and built a loop that is now 
>hanging on the wall inside my home, just 1m besides the bed 
>:-) (no XYL 
>here spoiling the fun). The loop is beaming to about 150/330 deg.
>
>After playing some days on 160m (an unusual high frequency, 
>witch feels 
>very strange. And the band is full of unknown callsigns!!) i did now 
>move down to more or less low frequencies, the 630m band!
>
>About 10 nF is needed to series resonate the loop. It has 
>about 2m x 2m 
>of size. The antenna current is not stable because the WIMA FKP-1 
>capacitor becomes warm during the 2 minute WSPR sequence. But the 
>maximum current in the loop is 14 A. That explains why the cap becomes 
>warm. A small parallel variable capacitor tunes to resonance. It is 
>tuned so that the upheating capacitor runs into the resonance point in 
>the middle of the WSPR sequence, then it runs out of the resonance by 
>upheating further. It can cool down during the following quiet 
>periods..
>
>14A into a 4 square meter loop at 475.7 kHz, how much ERP is that? The 
>PA consumes about 3.5 A at 13.8V, i.e. about 50 W.
>
>The system will run over the weekend, even during daylight. The signal 
>generator is a Raspi which will have no internet connectivity from now 
>on, so let's hope the time offset stays inside the accepted range for 
>this experiment.
>
>What will the best distance be? So far the band is closed but i'm 
>optimistic to crack the 1000 km distance with this QRP setup.
>
>73, Stefan
>
>
>---
>Diese E-Mail wurde von AVG auf Viren geprüft.
>http://www.avg.com
>