[Mark]

Wanted to show a picture of my receiver here, hope there is a preview possible inside the post :

BR,
Mark

[Mark]

Homebrew VLF tube receiver video

[Mark]

Dear SAQ Team,

will try to receive your signal with my homebrew VLF tube receiver with battery tubes – concept from 1919 book “Vacuum Tubes in Wireless Communication”

Hope to hear you tomorrow !

BR,
Markus

[Mark]

Dear guys in Grimeton,

thank you very much for posting my receiving equipment (telegraph) on your webpage !
That motivates me to try new, crazy things for SAQ receiving experiments.

Received your XMAS transmission with good signal and the telegraph was used again
for writing the CW signs on a strip of paper.

You made my XMAS

BR,
Markus
DL1DSN

[Mark]

Dear guys,

first of all : thank you for posting my QSL report with the telegraph picture at your front page !

XMAS morning I tried to receive your signal again and used a different receiver but again the telegraph
from W.Gurlt to write your message on a paper strip !
It worked again !
Signal was about -105 dBm, very clear and stable

My station :
antenna – 2 element beam for 7/10 MHz which works surprisingly well on VLF
attenuator 10 dB
up-converter to 10017.2 kHz
RX – FT1000MP with 500 Hz filter in the 1st and 2nd IF
homebrew AF detector for generating the pulses for the telegraph
telegraph : W.Gurlt, Berlin, 1880

Thank you very much for that successful operation – I’ve enjoyed it !

Regards,
Markus
DL1DSN

[Mark]

Dear Grimeton SAQ Team,

you made our day at the amateur radio club station DF0SAX near Dresden ! 3 successful transmissions – amazing.
Several people brought their equipment and we received your signal with 5 different antenna types and several
receivers. More details may follow. Just for now:
signal was always well above noise (after we switched off all noise sources around us) and we could receive
your signal with all used antennas:
– resonant loop
– non-resonant loop
– 26m vertical antenna
– ferrite rod antenne
– Mini-whip (electrical field antenna)
with different receivers.
One of the highlights was writing down the Morse code with 2 telegraphs which are much older than the transmitter in Grimeton !

1) German telegraph Gebr. Naglo
2) German telegraph W. Gurlt telegraph
both from around 1880 !

We were able to get the Morse code with ink on the paper clear and readable – no problems ! I will send you the paper strip with the 1st message by mail.
The only issue came up at the end of the 1st message when your TX was drifting and the signal was going down.
I think you noticed this also on your side.

Some impression in the following video (I hope the link works):
SAQ at DF0SAX – some impressions

[Mark]

Hello,
my first attempt to receive the SAQ today. Signal was good but I expected it stronger.

Antenna : shortwave beam 30/40m which works surprisingly good at VLF
RX: homebrew converter + FT1000MP

additional :
CW-Decoder
German telegraph from 1880 (Gerb. Naglo, Berlin) to write the Morse code to paper strip

Had a lot of noise here around 17 kHz, therefore the decoder was only able to deliver
some fragments of the text but I could hear and write it down manually without big problems.
Your signal was lower than MSF60 from UK, which is > 1000 km from here, much more than
the distance to Grimeton.
Thanks for your effort and the successful transmission today !

BR,
Mark

[Author]

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