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1. [Amps] Modern AM Broadcast Transmitters (score: 1): Author: donroden@hiwaay.net; Date: Sun, 18 Dec 2016 05:31:06 -0600; Modern AM Broadcast transmitters are pulse width modulated with the rated carrier power at 40% width of the pulses. Negative modulation moves the pulse width towards zero pulse width ( carrier cut-of; /archives//html/Amps/2016-12/msg00411.html (9,552 bytes)
2. [Amps] Modern AM Broadcast Transmitters (score: 1): Author: Donald Fox via Amps <amps@contesting.com>; Date: Sun, 18 Dec 2016 14:41:40 +0000 (UTC); Gents: If I understand what is being said correctly, you are describing a different way of modulating an AM carrier which in appearance sounds like it would look more like am FM carrier on an analog; /archives//html/Amps/2016-12/msg00414.html (8,329 bytes)
3. Re: [Amps] Modern AM Broadcast Transmitters (score: 1): Author: donroden@hiwaay.net; Date: Sun, 18 Dec 2016 10:04:42 -0600; Gents: So, if WLW ran the "old school" way of modulation, and had at one time an actual 500 KW carrier, would their meters have stood at 500 kw steady, or hung around 125 KW with 0 modulation and th; /archives//html/Amps/2016-12/msg00415.html (8,276 bytes)
4. Re: [Amps] Modern AM Broadcast Transmitters (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 18 Dec 2016 10:49:06 -0800; As a senior EE student at UC around 1963-4, I had a tour of WLW and the VOA site. That 500kW rig was still there and was fired upfor us, running into a dummy load (cooled by water circulated from a f; /archives//html/Amps/2016-12/msg00418.html (9,394 bytes)
5. Re: [Amps] Modern AM Broadcast Transmitters (score: 1): Author: Bryan Swadener via Amps <amps@contesting.com>; Date: Sun, 18 Dec 2016 19:11:30 +0000 (UTC); Thanks Don, PWM has been around since at least the early 1970s.It's NOT new. Originally, it used hollow state devices. I'll add that the switch rate needs to be at least twice the highest modulation; /archives//html/Amps/2016-12/msg00420.html (8,485 bytes)
6. Re: [Amps] Modern AM Broadcast Transmitters (score: 1): Author: donroden@hiwaay.net; Date: Sun, 18 Dec 2016 14:34:12 -0600; I'd have to pull my manuals, but I believe you are correct on the 75KHZ on the MW-50 . On the SX series, Harris did something "cute" by running the switch rate ( 60KHZ ) through a chip that produced; /archives//html/Amps/2016-12/msg00422.html (9,564 bytes)

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