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Re: [Discuss-gnuradio] power amplifiers on TX

From: Ron Economos
Subject: Re: [Discuss-gnuradio] power amplifiers on TX
Date: Wed, 30 Dec 2015 16:53:04 -0800
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

In Canada, you can use up to 2250 watts PEP output on SSB.


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.


However, due to the high PAPR of digital waveforms, it only delivers a few watts of average linear power.


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


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