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Author Topic: AM broadcast pirate PWM  (Read 1668 times)

Offline OgreVorbis

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AM broadcast pirate PWM
« on: May 01, 2018, 0410 UTC »
Hey,
I am making this post to show some good options if you're looking to pirate on AM broadcast band and are not skilled enough for home-brewing a transmitter.

http://amhercules.blogspot.com/
https://www.ebay.com/usr/zercvic2010?_trksid=p2053788.m1543.l2754
https://www.ebay.com/usr/kleop313?_trksid=p2060353.m2749.l2754
https://www.ebay.com/usr/savvi.polyc?_trksid=p2060353.m2749.l2754
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Offline redhat

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Re: AM broadcast pirate PWM
« Reply #1 on: May 27, 2018, 2338 UTC »
I would tread carefully.  I've heard some no-so-glowing reviews of his builds, especially his high power stuff.  I would also like to see some spectral measurements and see if the things can meet NRSC specs for emission.

There is a reason that commercial stuff runs in the $10/watt range... Like a friend of mine used to say about, uh, large women...lots of fun, but don't get caught.

+-RH
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Offline ThaDood

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Re: AM broadcast pirate PWM
« Reply #2 on: May 28, 2018, 0326 UTC »
Back in Summer 2015, I wanted something better for my aging +27 year old AM Carrier-Current gear, a Panaxis AM-100 exciter and a 2W home brew linear amp with a 7 element Chebychev. Looking at what that dude on PLL.gr had certainly fit the bill,   http://www.pll.gr/product?pid=AM-20W   (I was one of the last ones to get the unit with analog VU and SWR / RF OUT meters.) So, for $455.00USD's, I'd gotten an AM exciter with FREQ agile DDS oscillator, +24VDC - 6A power supply, 80W PEP amp, and an auto switching LPF board, with VSWR warning and RF fold-back protection. Beats paying Radio Systems for their $3,500.00 FCC certified TR-6000 10W AM exciter. However, I don't believe the amp is PWM, but a push-pull Class AB amp. Still, should last me for another +27 years, especially since I'm not running full bore 20W, but less than a 5W carrier to the CP-15 Radio Systems Carrier-Current coupler. Those Greeks seem to be kicking some RF butt on AM, and I'm glad to see that someone is.
I can't decide upon what's worst, young and stupid, or old and chemically dumbed down.

Offline Pigmeat

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Re: AM broadcast pirate PWM
« Reply #3 on: May 28, 2018, 1451 UTC »
Maybe Al can have him build a custom gigawatt CB for him?

Offline OgreVorbis

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Re: AM broadcast pirate PWM
« Reply #4 on: June 14, 2018, 0659 UTC »
I would tread carefully.  I've heard some no-so-glowing reviews of his builds, especially his high power stuff.  I would also like to see some spectral measurements and see if the things can meet NRSC specs for emission.

There is a reason that commercial stuff runs in the $10/watt range... Like a friend of mine used to say about, uh, large women...lots of fun, but don't get caught.

+-RH

The rig I have from him is a PWM. The first harmonic was -35-40 dB I think, but it's been a while since I looked. He's got a 250W on ebay with PWM. So the harmonics are not great, but there where no spurs I could detect. You could easily add your own LPF. Mine came with a 3 pole instead of the 4, which is probably why it's not the best. His pics showed a 4 pole though.

All the pll.gr TXs are not PWM and they're not made by the same "amhercules" guy.

After some more searching ebay, these look better:
3-8 MHz PWM: https://www.ebay.com/itm/PWM-with-DDS-Class-D-AM-Transmitter-for-80m-40m-Bands-Assembled-and-Tested/323265554444
500-1710 kHz: https://www.ebay.com/itm/PWM-with-DDS-Class-D-AM-Transmitter-Assembled-and-Tested/323261380658
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Offline OgreVorbis

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Offline Josh

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Re: AM broadcast pirate PWM
« Reply #6 on: June 14, 2018, 1654 UTC »
funky beat yo
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