In the original post I made the statement, "paraphrased," that the latest generation of SS devices run with plenty of overhead didn't need an auto tuner. They would not be hurt with the wrong antenna
-- ORIGINAL MESSAGE --(may be snipped) REPLY: A little OT but not much: Several years ago I was fortunate enough to get a tour of KFI, the AM broadcast station in Southern California. They were runni
Bill, Would you please explain this a little more? I am having trouble getting my head wrapped around "... a bunch of 250 watt modules which were combined and switched in and out at an audio rate to
That is becoming common practice. Modular transmitters. Just plug in the modules you want to get the power you want and I believe they have been hot swappable for some time. . I had never thought of
Is this an example of what is being discussed? http://www.fmamtv.com/products/Radio/BE%20AM10A.html That is becoming common practice. Modular transmitters. Just plug in the modules you want to get th
-- ORIGINAL MESSAGE --(may be snipped) REPLY: What the DX50 has is several racks of plug-in modules, each capable of 250 watts output. To produce the amplitude modulated output, they are individually
watts output." I installed a Harris DX-50 as my last project before exiting the broadcast engineering profession in 1995. The DX-50 was designed by Hilmer Swanson, a pioneer in solid-state broadcast
Is this an example of what is being discussed? http://www.fmamtv.com/products/Radio/BE%20AM10A.html I think not, the Harris (and their predecessors) switch modules on at it's prescribed (full) power
/* snip */ That's about all I know, except for one other puzzling thing: There was a power output meter on the transmitter which was rock steady at 50 kW. Normally, with AM the power kicks up during
I believe, in transmitters of this type, that the modules aren't combined in the same way we're used to in the likes of Quadra, PW-1 or SPE type amps - in the AM txs I think it's more like the module
-- ORIGINAL MESSAGE --(may be snipped) REPLY: Fascinating information, thanks Paul! Perhaps you can answer two questions? 1. Why does the output meter not kick up during modulation? and 2. How much d
The Nautel, GatesAir, and BE all use lumped constant combiners. Don W4DNR I believe, in transmitters of this type, that the modules aren't combined in the same way we're used to in the likes of Quadr
The modulation is applied by "reducing or controlling" the power, rather than plate modulation which adds and subtracts, so the maximum power is with full carrier and no modulation. Any modulation re
Bill, Correct as to what Don describes. Also, the meter is damped but will still show some movement. An RF ammeter still shows a 22.5% increase in line current with 100% symmetrical modulation. As I