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Date: Fri, 2 Apr 2010 10:52:06 +0100
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From: Gary - G4WGT <g4wgt@tiscali.co.uk>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: VLF: 4th VLF experiment by DK7FC/p
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Hi Stefan, LF,

I will be monitoring your frequency using a M0BMU type 30 turn 0.8M square
loop and 9kHz pre-amp into my PC sound card, software is SpecLab running
Marcus's "9kHz_4mHz" configuration. This loop system has increased my
reception of the Alpha signals by about 10db giving up to 25db SNR. Thanks
to Jim for a great design.

Stefan, can you tell me the QTH locator for your Tx site please.

Good luck with the 4th test.

73

Gary - G4WGT.


2010/4/2 Stefan Sch=E4fer <schaefer@hst.tu-darmstadt.de>

> Dear group,
>
> After a break of one week i plan to transmit again on VLF / 8,97 kHz. If
> the wind will be enough i will come up on saturday, 3. April, at arround=
 10
> UTC.
>
> The DFCW-600 mode was a good choice in the last experiment, so i will ke=
ep
> this mode.
>
> If Markus/DF6NM has time to make QSP on the mobile phone to the reflecto=
r
> (Markus ?) we could arrange various tests. I will also call other local
> stations for reception reports during the transmission.
>
> There will be some new components to test:
>
> Today i started building up the 600W class D PA (at least 600W) that is
> directly fed out of the 230V (rectified) of the generator. PTT and VFO=
 input
> is realised by fiber optic cables. The DC capacitor is 2000=B5F/350V and=
 can
> be put on voltage without a NTC or charging resistor due to the relative=
ly
> high output impedance of the small generator (tested). This works very=
 fine
> now. Tomorrow i will apply the FETs and the big ferrite core and it's
> windings. Then i will do a test on a dummy load at home. If the signal=
 will
> be 3dB stronger, we could theoretically change to DFCW-300 compared to=
 the
> last experiment. But there are many OMs writing private mails to me and
> prepare to be QRV on this next test. Some of them are using E-Field ante=
nnas
> and/or are more than 860km away, that' why i want to stay in QRSS-600 fi=
rst.
> So there might come a new distance record? In any case it will be exciti=
ng
> to me watching the new system running :-) Also it will be interesting to=
 see
> if the E-field antenna will get the signal!
>
> The primary winding of the TX coil is increased from 9 to 13 turns due=
 to
> the higher power that will be applied. Otherwise the current will become=
 to
> high.
>
> I will mount the amperemeter (analog, 1A) into the coil. That makes it
> easier to adjust to resonance and watch the stability and maximum and
> average (estimation) current.
>
> Finally i will try to apply some copper rods into the earth and will loo=
k
> how the antenna current is changing.
>
> The goal is to radiate 4mW ERP. Another goal is to reach as many station=
s
> as possible. So i would be pleased if YOU would be one of them. :-)
>
> Since the QRM/QRN comes up in the late afternoon and transmitting for 4.=
..5
> hours i will close at about 15 UTC. So the planned LF activity is not
> affected :-). Sorry, but i cannot participate on the LF acty later since=
 the
> VLF coil takes all the place in my car ;-)
>
> I looking forward to this experiment and wish you good luck and fun by
> receiving  :-)
>
> 73 es gl, Stefan/DK7FC
>
> PS: Could you give me a short feedback if you plan to be RX?
>
>
>
>

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Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Hi Stefan, LF,<div><br></div><div>I will be monitoring your frequency usin=
g a M0BMU type 30 turn 0.8M square loop and 9kHz pre-amp into my PC sound=
 card, software is SpecLab running Marcus&#39;s &quot;9kHz_4mHz&quot; conf=
iguration. This loop system has increased my reception of the Alpha signal=
s by about 10db giving up to 25db SNR. Thanks to Jim for a great design.</=
div>
<div><br></div><div>Stefan, can you tell me the QTH locator for your Tx si=
te please.</div><div><br></div><div>Good luck with the 4th test.</div><div=
><br></div><div>73</div><div><br></div><div>Gary - G4WGT.</div><div><br><b=
r>
<div class=3D"gmail_quote">2010/4/2 Stefan Sch=E4fer <span dir=3D"ltr">&lt=
;<a href=3D"mailto:schaefer@hst.tu-darmstadt.de">schaefer@hst.tu-darmstadt=
.de</a>&gt;</span><br><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Dear group,<br>
<br>
After a break of one week i plan to transmit again on VLF / 8,97 kHz. If=
 the wind will be enough i will come up on saturday, 3. April, at arround=
 10 UTC.<br>
<br>
The DFCW-600 mode was a good choice in the last experiment, so i will keep=
 this mode.<br>
<br>
If Markus/DF6NM has time to make QSP on the mobile phone to the reflector=
 (Markus ?) we could arrange various tests. I will also call other local=
 stations for reception reports during the transmission.<br>
<br>
There will be some new components to test:<br>
<br>
Today i started building up the 600W class D PA (at least 600W) that is di=
rectly fed out of the 230V (rectified) of the generator. PTT and VFO input=
 is realised by fiber optic cables. The DC capacitor is 2000=B5F/350V and=
 can be put on voltage without a NTC or charging resistor due to the relat=
ively high output impedance of the small generator (tested). This works ve=
ry fine now. Tomorrow i will apply the FETs and the big ferrite core and=
 it&#39;s windings. Then i will do a test on a dummy load at home. If the=
 signal will be 3dB stronger, we could theoretically change to DFCW-300 co=
mpared to the last experiment. But there are many OMs writing private mail=
s to me and prepare to be QRV on this next test. Some of them are using E-=
Field antennas and/or are more than 860km away, that&#39; why i want to st=
ay in QRSS-600 first. So there might come a new distance record? In any ca=
se it will be exciting to me watching the new system running :-) Also it=
 will be interesting to see if the E-field antenna will get the signal!<br=
>

<br>
The primary winding of the TX coil is increased from 9 to 13 turns due to=
 the higher power that will be applied. Otherwise the current will become=
 to high.<br>
<br>
I will mount the amperemeter (analog, 1A) into the coil. That makes it eas=
ier to adjust to resonance and watch the stability and maximum and average=
 (estimation) current.<br>
<br>
Finally i will try to apply some copper rods into the earth and will look=
 how the antenna current is changing.<br>
<br>
The goal is to radiate 4mW ERP. Another goal is to reach as many stations=
 as possible. So i would be pleased if YOU would be one of them. :-)<br>
<br>
Since the QRM/QRN comes up in the late afternoon and transmitting for 4...=
5 hours i will close at about 15 UTC. So the planned LF activity is not af=
fected :-). Sorry, but i cannot participate on the LF acty later since the=
 VLF coil takes all the place in my car ;-)<br>

<br>
I looking forward to this experiment and wish you good luck and fun by rec=
eiving =A0:-)<br>
<br>
73 es gl, Stefan/DK7FC<br>
<br>
PS: Could you give me a short feedback if you plan to be RX?<br>
<br>
<br>
<br>
</blockquote></div><br></div>

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