[BC] Freq agile AM transmitters

[Kent Winrich]

Yes Frequency agile on AM.

I have a bunch of 1kW units, 5kW units, 10kW units and of course the 317 we
have that is frequency agile.

That being said, the manual (317) states that you **should** be able to do a
frequency change in about an hour, THEN you have to adjust the ATU.  I have
not fired up the 317 to do such a change yet.  The whole system blew out a
set of 400 A fuses.  I have troubles with an AC unit.  Since there are FIVE
AC units, I have a job in front of me.

Other than the 317, the other transmitters are changed via thumbwheels.  530
- 1701


On 4/27/07, Neal Newman <groucho at skyweb.net> wrote:
>
> Frequency agile transmitter on AM?
> That's not easy to cover the Entire AM spectrum (540-1700) without
> some modifications to the transmitter
> the exciter cards are just some switch settings ,but the Amp
> stages  need either Capacitor, coil, or Toroid  changes.
> Usually they are in frequency ranges.
>
> Here is an example:
> I had a station just last week have a transmitter failure no backup.
> Lucky for them I had a spare BE AM-1A at my site( my AUX transmitter
> not yet installed) Its range 1580 to 1700 with its present
> configuration. Lets just say the station in need was at the lower end
> of that range. and the transmitter was set at the higher end.
>
> I called BE.. they said If I was lucky I could get 500 Watts out
> without changing the Toroids in the final stage.
> Heck 500 watts is better than being off the air. I loaded up the
> transmitter into my pickup and drove several hours to deliver and
> install the transmitter.
>
> Well  I wont complain. I got 800 watts out of the transmitter without
> the Toriod change.   Hey at least they were back on the air. Ill take
> 800 Watts over being totally off the air any day. After they repeair
> the NAUTEL that failed.  The BE will go back to the factory to have
> that Toriod changed. and will return as their backup TX..
>
>
>
> <mailto:WFIFeng at aol.com>WFIFeng at aol.com wrote:
>
> >By "Frequency Agile", I mean something where you flick a thumbwheel to
> the
> >required frequency, and press the "ON" button. You're there. *Not*
> something
> >that requires changing coils (or taps on coils) and tweaking various
> variable
> >caps... just like the modern Ham rigs: Just spin the VFO dial, and
> >you're on a
> >new frequency. (seconds, not hours.)
> >
> >The idea being that you can just toss the unit into the back of the car
> and
> >trundle it to a sister station as an instant backup. Dial up their freq,
> hook
> >it up, and press the button. It would be even better in a
> >multi-station setup,
> >where moving the input , output, and changing the freq would be all
> that's
> >required to get a failed station back on the air in mere minutes.
> >
> >Willie...
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