Author Topic: 3kw pep solid state amp 1.8-54 mhz  (Read 529 times)

digitalmod

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3kw pep solid state amp 1.8-54 mhz
« on: February 12, 2018, 0154 UTC »
 :D  When I was a boy I WAS IGNORANT in many ways, but could make an AM transmitter and in fact almost killed myself a number of times, HV KILLS.
But, here is a solid state 3 kw pep amp, which would need cooling fan, but with some amount of carrier in 41 meter band, and we would also need harmonic filter would make a 700 watt am transmitter. You figure which class D amp you want to series modulate or use the Heising method? Did I spell that right.
Its work for a technical person in a lab to complete the unit. Now, question was asked about class C vs E vs bipolar vs FETS.
I can't quite price everything here, but 3 kw pep would make a lethal rig driven with a ssb exciter.
Oh, naughty.. but there are many ways to make a transmitter work.. its a matter of choice, your needs, your skill level and pocket book. My gut feeling here is home brewing a kw am transmitter with class E, would be by far least expensive, but its also needs higher skill levels and lab equipment to adjust.

https://www.ebay.com/itm/3000-Watt-PEP-LDMOS-RF-Power-Amplifier-1-8-54-MHz-HF/222707564979?hash=item33da67c1b3:g:wjQAAOSwNNdZ1ToL
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Stretchyman

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #1 on: February 12, 2018, 0737 UTC »
Some BS there, they'll push close to a KW each so will barely do 2KW for a pair.

They are however the device of choice.

As previously discussed low level A.M. and further amplification wont sound as good as High level mod.

Str.

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digitalmod

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #2 on: February 12, 2018, 1728 UTC »
 8)  Yes, still amazing solid state gear if you have the skill to complete it and the power supply, plus a driver. Not sure how much drive. Generally a fan helps the sink get that time down for broadcasting service :'(
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JimIO

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #3 on: February 12, 2018, 1749 UTC »
I don't think too many pirates would be interested in something that needs more than a (four words "Made in the USA") NEMA 5-15P to IEC C13 power cord. ;D

digitalmod

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #4 on: February 12, 2018, 1841 UTC »
 :o Its funny I saw a discussion of a pirate radio that was FCC part 15 approved. When I was a kid, the FCC allowed 100 milliwaatt walkie talkies, my brothers had a set and I could hear them maybe half mile out. Later FCC with demands from corporate broadcasters changed it to millivolts at very close distance to antenna. That says a part 15 transmitter will be lucky to be receivable across the street !
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redhat

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #5 on: February 12, 2018, 1857 UTC »
I don't think too many pirates would be interested in something that needs more than a (four words "Made in the USA") NEMA 5-15P to IEC C13 power cord. ;D

Speak for yourself.  Someday I'll need a range outlet to power my solid state TX :)

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JimIO

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #6 on: February 12, 2018, 1924 UTC »
I heard a guy on the 75M AM window saying he did that. 2 Cree SIC FETS, no power transformer. Just full wave rectify 220 with 2 diodes. Said he had a web page and gave his call but I never found it.

Azimuth Coordinator

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #7 on: February 12, 2018, 2224 UTC »
Quote
As previously discussed low level A.M. and further amplification wont sound as good as High level mod.

Depends on how your low level modulation is generated..

AC
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JimIO

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #8 on: February 12, 2018, 2355 UTC »
Speaking of... Does anyone know how "compatible side band" (CHU time) is generated?
I have looked and can't find it explained anywhere. I'm guessing it starts out as low level AM and then one side band and some of the carrier if filtered out then it is linear amplified.
 

redhat

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #9 on: February 13, 2018, 0028 UTC »
Most likely the Kahn method with carrier leak.

+-RH
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Pigmeat

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Re: 3kw pep solid state amp 1.8-54 mhz
« Reply #10 on: February 13, 2018, 1948 UTC »
I don't think too many pirates would be interested in something that needs more than a (four words "Made in the USA") NEMA 5-15P to IEC C13 power cord. ;D

Speak for yourself.  Someday I'll need a range outlet to power my solid state TX :)

+-RH

C'mon over. I've got one in the kitchen I don't use and another in the basement that I can't figure out what it's for? The one for the dryer is on the the other side of the basement. Maybe they cooked down there in the pre-air conditioning era? This is an old house, built well before the lightbulb and possibly fire.