144 MHz across the Atlantic.

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EA8FF
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Joined: 2012/04/09 - 12:22
144 MHz across the Atlantic.

I have allways been interested to get a 144 MHz signal across the Atlantic. I have done it many times on 2m and 70 cm by EME, but so far it hasn't been done on tropo or Es, as far as I know, correct me if I'm wrong. I have been listening to Caribian repeaters just above 146 MHz a couple of years ago. I contacted a few people via echolink on the same repeaters to try to get a skedule with anybody with a decent station, close to the Atlantic, but no luck so far.
I am sure it can be done using WSPR and the right equipment. When I came first to live in this place more than 17 years ago, 2m and 70cm where absolutely quiet. These days I took all my antennas down because both bands are full of spurs, tens of dB above noise, one next to the other, because in a radius of 50m from my QTH there are probably 100 microprocessors blowing spurs around.
So I looked for a quieter site and found it approx 4 km from were I live. It's in line of sight, so I made a remote base, connected to my home QTH by modified WiFi, 1 mW on 2359 MHz.
The station can run 24/7 400 W out into a DK7ZB "hentenna" approx 9 dBi. 150m asl, free sight to the Atlantic, QTF 290.
I am looking forward to find one or more stations to run with on the other side of the Atlantic during the Es season and later when the atlantic high pressure provides tropo.
The main problem on 144 MHz WSPR is frequency stability and accuracy. You would need a tranceiver with at least a very stable master oscillator and a means to exactly calibrate you frequency.
Not easy on 144 MHz. This end I have all oscillators locked to a HP Z3801a GPS standard, my transmit frequency is within 1 Hz or better. I found that the Meinberg program is the very best to sync WSPR in time, even with time servers more than 150 ms away and bad internet it syncs WSPR witin milliseconds here, better than GPS without 1pps sync.
Mark, EA8FF.