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Date: Fri, 2 Apr 2010 18:23:53 +0200 (CEST)
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From: =?ISO-8859-15?Q?Horst_St=F6cker?= <horst.stoecker@web.de>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: AW: VLF: 4th VLF experiment by DK7FC/p
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Hello all,
I will listen/look for Stefans signal from my Shack. Unfortunately I will=
 have not enough time for a trip to the countryside tomorrow.
After Stefans surprising announcement I did some receiving tests today. I=
 hear and see all Alpha stations with good S/N. Unfortunately there is muc=
h QRM exactly between 8,5 and 9 kHz. So catching Stefans might be difficul=
t. We will see.
The Distance form Stefan to my QTH is about 160 km.
The main configuration will be my 10h/20t T-antenna with the AATIS VLF-rec=
eiver I built some years before. He has some active filtering and is usual=
ly doing a good job. It is connected directly to the line input of the sou=
ndcard.
My MV-62 selective level meter will also get a chance instead of the VLF-r=
eceiver.

Stefan, good luck ;-)) - and also to the RX operators

Horst
-----Urspr=C3=BCngliche Nachricht-----
Von: "Stefan Sch=C3=A4fer"=20
Gesendet: 02.04.2010 13:09:33
An: rsgb_lf_group@blacksheep.org
Betreff: AW: VLF: 4th VLF experiment by DK7FC/p

>Hi Gary, VLF, LF,
>=20
>The locator is JN49IS. In older mails i have given you the exact coordina=
tes. In google maps you can find the QTH within a sector of some 10m.
>=20
>QRG is 8,97000 kHz. The 4mHz settings is optimal! If the SNR will be good=
, you can try 8mHz as well or 15, like Markus did it at the end of the tes=
ts. 15mHz seems to be optimal for DFCW-120 but i will start with DFCW-600.=
..
>=20
>I will have no internet access until saturday night, so cu after the expe=
riment.
>Hopefully the wind will be strong enough, the forecast shows about 20km/h=
 from south. This would be enough...
>=20
>Best 73 es gd RX! :-)
>=20
>Stefan/DK7FC
>
>________________________________
>
>Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Gary - G4WGT
>Gesendet: Fr 02.04.2010 11:52
>An: rsgb_lf_group@blacksheep.org
>Betreff: Re: VLF: 4th VLF experiment by DK7FC/p
>
>
>Hi Stefan, LF,=20
>
>I will be monitoring your frequency using a M0BMU type 30 turn 0.8M squar=
e 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 rec=
eption 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=C3=A4fer=20
>
>
>   Dear group,
>  =20
>   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 arrou=
nd 10 UTC.
>  =20
>   The DFCW-600 mode was a good choice in the last experiment, so i will=
 keep this mode.
>  =20
>   If Markus/DF6NM has time to make QSP on the mobile phone to the reflec=
tor (Markus ?) we could arrange various tests. I will also call other loca=
l stations for reception reports during the transmission.
>  =20
>   There will be some new components to test:
>  =20
>   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=C2=B5F/=
350V and can be put on voltage without a NTC or charging resistor due to=
 the relatively high output impedance of the small generator (tested). Thi=
s 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-30=
0 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 usi=
ng E-Field antennas and/or are more than 860km away, that' why i want to=
 stay in QRSS-600 first. So there might come a new distance record? In any=
 case 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!
>  =20
>   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 beco=
me to high.
>  =20
>   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 ave=
rage (estimation) current.
>  =20
>   Finally i will try to apply some copper rods into the earth and will=
 look how the antenna current is changing.
>  =20
>   The goal is to radiate 4mW ERP. Another goal is to reach as many stati=
ons as possible. So i would be pleased if YOU would be one of them. :-)
>  =20
>   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 si=
nce the VLF coil takes all the place in my car ;-)
>  =20
>   I looking forward to this experiment and wish you good luck and fun by=
 receiving  :-)
>  =20
>   73 es gl, Stefan/DK7FC
>  =20
>   PS: Could you give me a short feedback if you plan to be RX?
>  =20
>  =20
>  =20
>  =20
>
>
>
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