[GreenKeys] Model 15 remedial question Inbox

[Ralph Mowery]

Tom you need to qualify the 60 ma.  

 

The magnet coils have to be wired for 60 ma if you use the 60p ma loop.  Some machines are set for 20 ma, but for best operation 60 ma is usually the best.  Some even have a switch for  20 or 60 ma loops.  You are right about the voltage.  Not too critical but try to stay above 100 volts if possible.  Up to about 200 volts is often better if you have several sets of coils in series from other machines .  The machines will operate with lower than 100 volts but often the range finder is limited and if receiving over the radio circuits under bad conditions the higher voltages usually work better.

 

Ralph ku4pt

 

 

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Tom Hunter
Sent: Saturday, January 01, 2022 12:14 AM
To: GreenKeys at mailman.qth.net
Subject: [GreenKeys] Model 15 remedial question Inbox

 

Jason,

 

You need to measure the current flowing through your model 15, even with a multimeter in series with your loop.

It should be 60 Milliamps. I have voltages from 80 to 180 in my various loops, but in all cases the current is set to 60 mils by variable resistors. I have so many places to measure loops, I buy 100 milliamp panel meters three at a time. 

 

By the way, 120 is the most common voltage. 

 

But the current MUST be 60 mils for a model 15!

 

If you have your loop connected to the selector magnet, it should be pulled in already.If you can still push the armature in, then there is something very wrong with you loop supply. Harold is correct - everything in the loop is in series. If you want two machines to talk to each other, both keyboards and both selectors are all in series across the loop supply.

 

I have machines in three different locations here and everything is in series.

 

 

Tom N3CRK

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20220101/98c2830c/attachment.html>