[Milsurplus] Working on my ART-13's

[Ray Fantini]

The tricky thing about the external power supply if you're building one is to remember that the shunt for the PA current meter is located in the power supply and not the radio. The plate current shunt should be located on the negative side of the HV supply to ground and provide a negative voltage back to the meter circuit in the transmitter, don't recall off the top of my head but think you use a 2.5 or 0.25 ohm resistor rated at 10 watts. Also life is way better if you use a external regulated 28 or 24 volt high current power supply for the filaments, relays and motors with one switch to activate that (filament) and then a second switch (HV) to bring in the B+ and HV, you don't need HV all the time, only when you transmit and that way you can work on the control and auto tune functions without fear, and if you have never seen a ART transmitter run in channel mode be warned the first time you put 28 volts DC to it may scare the hell out of you once all the motors start running!
RF


From: John Watkins [mailto:jpwatkins9 at yahoo.com]
Sent: Tuesday, February 14, 2012 1:25 PM
To: Ray Fantini; Meir WF2U; milsurplus at mailman.qth.net; 'MRCA'
Subject: Re: [Milsurplus] Working on my ART-13's

Just finally got my shipment and will be digging out the R-807 and getting it up and running.  I also have the dyno supply , but I think I will use an AC supply to check everything out.  Mine is newer than the ART-13s being built in the 70s.  Will pair it with my US-9 and see how it goes.  Hope to get it all done by the end of the summer.  hate it when work gets in the way.

John  WD5ENU