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Re: [Discuss-gnuradio] power amplifiers on TX

From: Nate Temple
Subject: Re: [Discuss-gnuradio] power amplifiers on TX
Date: Wed, 30 Dec 2015 17:06:22 -0800

Just to add onto what Ron has said, the limit in the US is 1500 watts, but 
there are some restrictions per band, and license level. Details here [ 
http://www.arrl.org/frequency-allocations ] but below are the important 

- "Unless otherwise noted, the maximum power output is 1500 watts PEP. 
Novice/Technicians are limited to 200 watts PEP on HF bands."

60m - "Effective March 5, 2012, amateurs are permitted to use digital modes 
that comply with emission designator 60H0J2B, which includes PSK31 as well as 
any RTTY signal with a bandwidth of less than 60 Hz. They may also use modes 
that comply with emission designator 2K80J2D, which includes any digital mode 
with a bandwidth of 2.8 kHz or less whose technical characteristics have been 
documented publicly, per Part 97.309(4) of the FCC Rules. Such modes would 
include PACTOR I, II or III, 300-baud packet, MFSK16, MT63, Contestia, Olivia, 
DominoEX and others. with a maximum effective radiated power (ERP) of 100 W. 
Radiated power must not exceed the equivalent of 100 W PEP transmitter output 
power into an antenna with a gain of 0 dBd."

30m - "Maximum power, 200 watts PEP. Amateurs must avoid interference to the 
fixed service outside the US."

10m Novice / Technician - "Maximum power 200 watts PEP"

1.25m - 50w PEP , Novice / Technician 25w PEP

23cm - Novice - 5w max PEP


> On Dec 30, 2015, at 4:53 PM, Ron Economos <address@hidden> wrote:
> 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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