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You can modulate DATV on 10 GHz using just an Adalm Pluto
Posted: Wed Jan 23, 2019 4:39 pm
by F6DZP
Hello,
If you have an Adalm Pluto, you can use DATVexpress transmitter to send DVB-S or DVB-S2 at frequency 3457 MHz.
As the signal is not filtered, you have a beautiful Harmonic 3 on 10371 MHz that is usable.
I just hold by hand my Avenger LNB at about 1 meter and receive the video with Minitioune on 621 MHz.
yes it is just a test, if we want to use this solution for DATV on 10 GHz, we need a High pass filter and good amplifier. But it is funny to try.
Jean-Pierre F6DZP
Re: You can modulate DATV on 10 GHz using just an Adalm Pluto
Posted: Thu Jan 24, 2019 10:08 am
by GW3KAX
Hi this is my first post so please excuse!
I noticed 3ELI and others were interested in Adalm Pluto and short supply.
Mouser seem to be saying they have 610 IN STOCK
Apologies if off beam
GW3KAX
Re: You can modulate DATV on 10 GHz using just an Adalm Pluto
Posted: Thu Jan 24, 2019 3:12 pm
by JA1SYK
Hello Pierre
I have tried a Harmonic 3 on 10225MHz using just an PlutoSDR as you say.
I made a summary report at the 2018 All Japan Microwave Meeting that was held in November 18 in Tokyo.
http://www.microwavemeeting.org/
My PowerPoint and presentation are as follows.
http://www5.wind.ne.jp/ja1syk/MWM-2018/ ... 0GHz-P.pdf
http://www5.wind.ne.jp/ja1syk/MWM-2018/kouen.jpg
This is my poster session.
http://www5.wind.ne.jp/ja1syk/MWM-2018/PS1.jpg
http://www5.wind.ne.jp/ja1syk/MWM-2018/PS2.jpg
The first picture; The PlutoSDR is working on 3.4GHz with GNU Radio on Ubuntu. At same time the PlutoSDR is sending three times frequency, 10.2GHz form a Feed Horn, sending a RB-DATV, SR 1400S/s, DVB-S2, 8PSK.
The second picture; A Horn is receiving 10.2GHz signal, next a LNB and a MiniTioune USB receiver on Windows 10. We can see the RB-DATV fine, MER 23dB.
The Harmonic three 10.2GHz signal was about -30dBm compared with on 3.4GHz signal.
Your MiniTioune works very well, many thanks, de JA1SYK Hiro in Japan.
Re: You can modulate DATV on 10 GHz using just an Adalm Pluto
Posted: Fri Jan 25, 2019 4:01 pm
by g4hiz
Hello Jean-Pierre and Hiro,
thanks very much for highlighting this very useful technique - but you don't even need a Pluto. In my shack I have connected either a DTX1 or Portsdown with a 1133MHz, 1MS/s output to a non-linear amp (dBm output range) and created 5665MHz (5th harmonic) which was perfectly receivable via my 6cm transverter into the Minitiouner Rx. The 'test range' consisted of a horn for transmit and PCB yagi for receive, about 6m apart, to give a MER of 12dB or better. If you look at the spectrum across several harmonics, the odd harmonics appear to be a faithful copy of the fundamental frequency, albeit with possible phase ambiguity, whereas the even harmonics appear to be unusable. More experimentation needed, but this technique could well be used up into the higher microwave frequencies, who knows !?
73
Jen G4HIZ
Re: You can modulate DATV on 10 GHz using just an Adalm Pluto
Posted: Sat Jan 26, 2019 8:21 am
by G8AGN
Hiro
Please can you post a larger picture of the GNU flow chart for the Pluto DATV? The slide in your presentation is too small to read.
73
Barry G8AGN
Re: You can modulate DATV on 10 GHz using just an Adalm Pluto
Posted: Sat Jan 26, 2019 8:58 am
by g0mjw
G8AGN wrote: ↑Sat Jan 26, 2019 8:21 am
Hiro
Please can you post a larger picture of the GNU flow chart for the Pluto DATV? The slide in your presentation is too small to read.
73
Barry G8AGN
Hi Barry,
Did you look at the examples? e.g.
- Capture2.JPG (173.91 KiB) Viewed 6911 times
There are lots of them in the examples directory under dvb
- Capture3.JPG (27.23 KiB) Viewed 6911 times
Mike
Re: You can modulate DATV on 10 GHz using just an Adalm Pluto
Posted: Sat Jan 26, 2019 4:32 pm
by JA1SYK
Re: You can modulate DATV on 10 GHz using just an Adalm Pluto
Posted: Sun Jan 27, 2019 8:45 am
by G8AGN
Hiro and Mike
Many thanks for the info
73
Barry, G8AGN
