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Content preview: Hi Stefan, I just checked on WSPRnet and red you got plenty of reports from your QRP activity so my 3 spots are a drop in the sea.. but 3 spots: TimestampCallMHzSNRDriftGridPwrReporterRGridkmaz 2019-01-26 03:34 DK7FC 0.475683 -27 0 JN49ik 0.01 IK1HSS JN35tb 493 190 2019-01-26 03:28 DK7FC 0.475683 -25 0 JN49ik 0.01 IK1HSS JN35tb 493 19 [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.216.176.236 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (marcocadeddu[at]tin.it) 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: d63ea50e288c5ecb9bd7a86eeabe94f2 Subject: R: LF: TXing WSPR/MF on an indoor loop Content-Type: multipart/alternative; boundary="----=_Part_27756_30623582.1548488968150" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false ------=_Part_27756_30623582.1548488968150 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Stefan, I just checked on WSPRnet and red you got plenty of reports from your QRP activity so my 3 spots are a drop in the sea.. but 3 spots: TimestampCallMHzSNRDriftGridPwrReporterRGridkmaz 2019-01-26 03:34 DK7FC 0.475683 -27 0 JN49ik 0.01 IK1HSS JN35tb 493 190 2019-01-26 03:28 DK7FC 0.475683 -25 0 JN49ik 0.01 IK1HSS JN35tb 493 190 2019-01-25 16:10 DK7FC 0.475683 -27 0 JN49ik 0.01 IK1HSS JN35tb 493 190 the rx is a direct conversion rx with a simple bandpass input filter.. it is sensitive but lacks of course of image rejection and other features that make a real receiver another thing :-) The strange point is how the 3 spots are spreaded in the period: 16:10 03:28 03:34.. Some years ago I made some trials on 137 kHz using an (outside) 2 turns loop (5x5m) and it was funny 73, Marco IK1HSS ----Messaggio originale---- Da: selberdenken@posteo.de Data: 25-gen-2019 15.23 A: Ogg: 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 ------=_Part_27756_30623582.1548488968150 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Stefan,

I just checked on WSPRnet and red you got plenty of repor= ts from your QRP activity so my 3 spots are a drop in the sea.. but

3= spots:

Drift
TimestampCallMHzSNRGridPwrReporterRGridkm<= /th>az
 2019-01-26 03:34  DK7FC  0.475683  -27  0  JN49ik  0.01 <= /td> IK1HSS  JN35= tb  493 &n= bsp;190 
 2019-01-26 03:28  DK7FC  0.475683  -25  0  JN49ik  0.01 <= /td> IK1HSS  JN35= tb  493 &n= bsp;190 
 2019-01-25 16:10  DK7FC  0.475683  -27  0  JN49ik  0.01 <= /td> IK1HSS  JN35= tb  493 &n= bsp;190 
the rx is a direct conversion rx wit= h a simple bandpass input filter.. it is sensitive but lacks of course of i= mage rejection and other features that make a real receiver another thing := -)
The strange point is how the 3 spots are spreaded in the period: 16:1= 0 03:28 03:34..

Some years ago I made some trials on 137 kHz using a= n (outside) 2 turns loop (5x5m) and it was funny

73, Marco IK1HSS

----Messaggio originale----
Da: selberdenken@posteo.de
Data: 25-gen-2= 019 15.23
A: <rsgb_lf_group@blacksheep.org>
Ogg: LF: TXing WSPR= /MF on an indoor loop

Hi MF,

A few days ago i took some RF li= tz 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 freque= ncies, the 630m band!

About 10 nF is needed to series resonate the l= oop. It has about 2m x 2m
of size. The antenna current is not stable be= cause the WIMA FKP-1
capacitor becomes warm during the 2 minute WSPR se= quence. But the
maximum current in the loop is 14 A. That explains why = the cap becomes
warm. A small parallel variable capacitor tunes to reso= nance. It is
tuned so that the upheating capacitor runs into the resona= nce point in
the middle of the WSPR sequence, then it runs out of the r= esonance by
upheating further. It can cool down during the following qu= iet 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 <= br>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 QR= P setup.

73, Stefan



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