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 much QRM 
exactly between 8,5 and 9 kHz. So catching Stefans might be difficult. 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-receiver 
I built some years before. He has some active filtering and is usually doing a 
good job. It is connected directly to the line input of the soundcard.
My MV-62 selective level meter will also get a chance instead of the 
VLF-receiver.

Stefan, good luck ;-)) - and also to the RX operators

Horst
-----Ursprüngliche Nachricht-----
Von: "Stefan Schäfer" 
Gesendet: 02.04.2010 13:09:33
An: [email protected]
Betreff: AW: VLF: 4th VLF experiment by DK7FC/p

>Hi Gary, VLF, LF,
> 
>The locator is JN49IS. In older mails i have given you the exact coordinates. 
>In google maps you can find the QTH within a sector of some 10m.
> 
>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 tests. 15mHz 
>seems to be optimal for DFCW-120 but i will start with DFCW-600...
> 
>I will have no internet access until saturday night, so cu after the 
>experiment.
>Hopefully the wind will be strong enough, the forecast shows about 20km/h from 
>south. This would be enough...
> 
>Best 73 es gd RX! :-)
> 
>Stefan/DK7FC
>
>________________________________
>
>Von: [email protected] im Auftrag von Gary - G4WGT
>Gesendet: Fr 02.04.2010 11:52
>An: [email protected]
>Betreff: Re: VLF: 4th VLF experiment by DK7FC/p
>
>
>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 Schäfer 
>
>
>   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 keep 
> this mode.
>   
>   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.
>   
>   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 2000µF/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). 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 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!
>   
>   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 look 
> how the antenna current is changing.
>   
>   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. :-)
>   
>   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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