[Milsurplus] instrument inverter

[Mike Morrow]

Ray wrote:

>Expect the inverter to only run when changing channels on the transceiver,
>the servos and amplifiers are way to noisy to keep on all the time so now 
>want to have a noisier inverter just to do it. The real question is how long
>will it take to spin up to speed and reach 400 cycles? Do you have to have
>a regulated supply for the inverter input?

Ray,

How do you get the receiver to function if you supply 400 cps AC power only during channel change?  I seem to recall that the receiver HV supply for sets like 618S and AN/ARC-38 comes from an external 400 Hz AC-input transformer supply that operates continuously.  For example, the DY-118/ARC-38 contains a continuously operating AC-input supply supply for the receiver, plus a 28 vdc-input dynamotor supply that operates only when tranmitting (or when CW mode is selected).  If you drop the 400 Hz AC, the receiver HV power supply quits.

>do the ART-13 or ARC -1 dynos run all the time they are on or only when
>they are keyed?

In VOICE mode, the dynamotor for the AN/ART-13 operates only when the mic is keyed.  In CW or MCW mode, the dynamotor operates continuously.  We don't want the dynamotor trying to start and stop with the beginning and end of every every dot and dash. 

The AN/ARC-1 dynamotor must operate continuously, since it supplies HV for both the receiver and the transmitter.

Mike / KK5F