Don Fox raises a question I’ve wondered about for years: how are these very
high power amplifiers initially placed in service? Today, we have VNAs we can
put in the palm of our hand, how is it done now and how was it done when there
was nothing but vacuum tubes? How adjustable are the PA output circuits? It
can’t possibly be done the way we tune our puny 1.5 kW amps.
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Sep 10, 2022, at 6:53 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
> On 9/10/2022 4:01 PM, Donald Fox via Amps wrote:
>> We all know that the internet is a mixed blessing. Lots of good stuff, but
>> also very bad if one seeks it out. I find it quite amazing, to watch a VOA
>> or similar class transmitters being brought up, and put online. I've lived
>> no more than an hour away from Bethany, Ohio which many know was a VOA site
>> until 1994.
>> Near by WLW in Mason, Ohio is on the air today covering 37 states at night,
>> and 9 in the daytime if I recall correctly, with 50kw on 700kc.
>> There is quite a history there, back when WLW ran 500kw! That figure is hard
>> to wrap my brain around, as we are talking brute power, before any sort of
>> antenna gain came into play. The sheer magnitude of such an operation, and
>> the fact that this amount of RF could be generated in one place back when
>> they did it, is quite a feat in my opinion.
>
> Back in 1964, our senior EE class got to tour that site. We'd just finished
> our course in transmission lines, so it was a wonderful lab! I'd been a ham
> since '55, so I knew about Rhombics (of which there were around two dozen)
> but the two Sterba Curtains were new to me.
>
> 73, Jim K9YC
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