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Re: [Discuss-gnuradio] power amplifiers on TX

From: Markus Heller
Subject: Re: [Discuss-gnuradio] power amplifiers on TX
Date: Thu, 31 Dec 2015 01:35:39 +0100

Has anybody tried to implement the WSJT line of signal processing
algorithms in GNURadio? In fact it could be quite interesting not just
to use Joe K1JT's programs but to play around with his great signal
processing ideas. 

And I guess it could make sense to re-use his algorithms for other
purposes, too. 

These programs are all open source software... So it should be a
straightforward idea to dissect them into their parts and wrap them into

The first moonbounce QSO with GNURadio code only would be a really cool

And, you don't need a likowatt and a 24 Yagi array any more to do


Am Mittwoch, den 30.12.2015, 16:26 -0800 schrieb Kevin McQuiggin:
> The amateur limit is 1000 Watts.  Personally I ran 800+ Watts on the 2
> metre band in the late 1980s for my EME (moonbounce) station.  All
> analog, single long-boom Yagi.  I used a 2M downconverter and listened
> on my 10M receiver as it was way more sensitive than my 2M rig.
> Over about a year's operation I heard about 10 stations via EME and
> worked only 2.  Still, that was a very good operational record for a
> single Yagi station of the era.
> Possibly relevant to Marcus' and others' warnings, my power amplifier
> did EXPLODE on one occasion due to dried-out filter capacitors.  Big
> fireball, and little bits of paper blown right through the amplifier
> case and all over the room.  It was spectacular :=/
> My wife tells the story very well: she was in the kitchen and heard this
> big "BOOM".  She called upstairs "Is everything alright?" and I calmly
> replied "No problem.  Could you bring the fire extinguisher up here please?"
> Fortunately no fire, and I replaced the filter capacitors.  The
> amplifier was fine - a good bonus, as I had borrowed it from a research
> lab at a local university for a couple of weeks.
> With the new weak signal DSP techniques, I hear that 100 Watts and a
> single Yagi will get you many contacts, although the data rate will be
> very low.  Still, it works and that is amazing!
> I think Daniel was just asking if these German amplifiers are good
> quality.  I hear that they are, and that they work very well, although I
> have never used or seen one in person.  I hear they stand behind their
> gear, and will also do custom designs.
> Kevin (VE7ZD)
> On 15-12-30 04:03 PM, Johnathan Corgan wrote:
> > On Wed, Dec 30, 2015 at 3:14 PM, James Humphries
> > <address@hidden <mailto:address@hidden>> wrote:
> >  
> > 
> >     I'm on Marcus' side with that output power, that's a scary high
> >     output. I start to sweat at 10W... :)
> > 
> > 
> > ​Heh, I connected a USRP to a 20KW PA once.  Sweating was only one of
> > several things done in anticipation :)​
> >  
> > 
> > -- 
> > Johnathan Corgan
> > Corgan Labs - SDR Training and Development Services
> > http://corganlabs.com
> > 
> > 
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > 
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