[ARC5] Getting ARC5 and SCR-274N Txs on 40 m

[Robert Eleazer]

Has anyone figured out which Command Set transmitters can be changed in frequency just by swapping out the MO coil?

For example, can you take a 5.3 to 7 MHz set and just put in a 7MHz MO coil?  Or take a 4 to 5.3 MHZ transmitter and put in a MO coil suitable for 80M?   

Obviously there are other tuned circuits in the transmitter but do they have the range required to handle the MO?

And obviously you would need a new dial, but taking a circle of aluminum and making markings on it based on your frequency counter or a receiver with known calibration is an easy and quick swap out task.  The idea is, of course to change the frequency of the less desirable transmitters without doing anything that would not be easily reversible.

The 4 to 5.3 MHZ transmitter I have in which I will be changing the MO coil to one for 7 MHZ already has everything but the MO coil and tuning cap stripped out, by the way.

Wayne
WB5WSV    
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