[BC] "Portable" freq. agile AM TX

[Alan Alsobrook]

It would probably work for the bottom 4 without any major changes, but 
the 760 would require the major retune.

To my Knowledge none of the AM boxes are frequency agile. This is 
primarily due to the output network tuning and the 3rd harmonic trap.

I talked to the Armstrong people about this briefly in Philly, I'm not 
sure how their output network is set up but they indicated it's not a 
major retuning job as long as you stay on one end of the band.

I have no idea what the output network on the BE or the DAX are like. If 
the DAX uses the same design network as the Gates series it would be a 
very complicated retune, and not for the faint of heart (or those 
without good test equipment) in the field.

If you had (like you do) a set of known stations for the unit to cover 
then to the obvious choice to me, would be to have one tuned to each 
frequency with any caps marked as to which frequencies to use them for 
and all coil taps/positions marled ahead of time. This way you could 
retune in minutes when the time came.

WFIFeng at aol.com wrote:
> Does a frequency-agile, rack-mountable transmitter exist? I know that 
> Armstrong has one that may almost fit this description, but I'm looking to find out 
> if there is anything else that is relatively easy to set up "in a pinch".
> 
> We want to buy such a box that could be hauled in the back of a car on a 
> moment's notice and set-up on-site. Anything in the 500w to 1Kw range would be 
> ideal.
> 
> We have 5 AM's in our group. The freq's are as follows:
> 
> 760   kHz
> 1230    "
> 1320    "
> 1500    "
> 1590    "
> 
> Suggestions?

-- 
Alan Alsobrook CSRE AMD CBNT
St. Augustine Fl. 32086 904-829-8885
aalso at Bellsouth.net