[Milsurplus] Command Set Transmitter Keying

[jcoward5452 at aol.com]

Mike and Mike,
 Yes, I agree on the soluton being apt for the technology.I have all the components to build an AN/ARC-5 set-up and hopefully it will actually work when complete.However,if there are enhancements that I can build in as I go, that would help with the final outcome.And just to clear the air, only reversable mods will be acceptable.
 Now,what will I encounter on the RU/GF set? Not nearly as many relays!
 As for building up working examples of radio gear, the hardest part is connectors and cableing. I have yet to achieve competence in cable lacing.You guys have any tutorials on the subject?
 Jay
 


-----Original Message-----

From: Mike Morrow <kk5f at earthlink.net>
To: milsurplus at mailman.qth.net
Sent: Mon, Dec 28, 2009 3:58 pm
Subject: Re: [Milsurplus] Command Set Transmitter Keying



> Wouldn't a reverse biased diode across the coil "kill" the back emf?
Yes, it would...it's a very common application of diodes to kill inductive
witching spikes across *switches* to coils and solenoids.
I, however, would want to attempt to resolve the problem using components
ontemporary with the equipment...in this case, a resistor.
But, anything that creates a current path through the relay coils, be
t a reversed-biased diode or the resistor I'm so enthusiastic about
rying, can actually cause more delay in relay drop out that is a function
f the the RL circuit that is created (R is equal to the coil resistance
nd swamping resistance, L is inductance of the relay coil).
So, my resistor or your diode could likely make things worse.  I'd just
ike to see it tried...six relays in parallel creates a complex situation,
nd all we'd need is a drop in K52 drop out time relative to the K55
elay.
Mike / KK5F
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