Hi Stefan,
so far I seem to be the only spotter.
73
Clemens
DL4RAJ
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>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of DK7FC
>Sent: Friday, January 25, 2019 3:23 PM
>To: [email protected]
>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
>
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