Re: [Discuss-gnuradio] power amplifiers on TX

[Markus Heller]

Hi Ron,

Michael Kuhne DB6NT started with HAM products a few decades ago. They
were so good in quality that they were used by commercial customers. So
he set up his company. Today he makes his money with commercial
customers bus has not forgotten his roots. DB6NT is really cool. 

And he's also open for discussions and good ideas from the HAM domain. I
once had a chat with him about a WIFI transverter from the 13cm band
into higher GHz bands. 

So if you need something special, I do advise you to simply contact him.
Even in face he does not have an according product for you, he might
help you with ideas and hints nevertheless. 

vy73
markus
dl8rds



Am Mittwoch, den 30.12.2015, 16:53 -0800 schrieb Ron Economos:
> In Canada, you can use up to 2250 watts PEP output on SSB.
> 
> http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf01226.html#p10.2
> 
> In the US, it's 1500 watts PEP output in any mode.
> 
> The Kuhne Electronic equipment is excellent stuff. It's essentially 
> commercial equipment that's been re-purposed for the ham bands. In fact, 
> as a licensed operator, you can purchase their industrial products. For 
> example, I'm using this amplifier for 70cm digital television.
> 
> http://shop.kuhne-electronic.de/kuhne/en/shop/industrial/prof-power-amplifier/KU+PA+04105025+A++UHF+MOSFETPower+Amplifier/?card=413
> 
> However, due to the high PAPR of digital waveforms, it only delivers a 
> few watts of average linear power.
> 
> Ron
> 
> On 12/30/2015 04:26 PM, Kevin McQuiggin wrote:
> > 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
> >>
> >>
> >> _______________________________________________
> >>
> 
> 
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