[GreenKeys] 43A-1 Test Meter?

[W2HX]

True, neutral loop is only 0-60mA but then I would think a switch to change the polarity would be useful since you might not know if the loop you’re plugging into is +tip -sleeve or -tip +sleeve? Maybe that is what the big telco switch on the side is meant for? Reversing the polarity? Dunno.


73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos

From: Paul Heller <paul0926 at comcast.net>
Sent: Friday, December 2, 2022 2:38 PM
To: W2HX <w2hx at w2hx.com>
Cc: Greenkeys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] 43A-1 Test Meter?

I would say it depends on the signaling. If polar you would want negative and positive. But if normal (non-polar, I forget the name) the current is either zero or 60ma (or 20 or 30 depending)

Right?

Paul
W2TTY


On Dec 2, 2022, at 8:18 PM, W2HX <w2hx at w2hx.com<mailto:w2hx at w2hx.com>> wrote:

Anyone ever run across this? I couldn’t find anything on it

https://w2hx.com/x/TTY/43A-1%20Test%20Meter/20221202_141257.jpg

I picked it up thinking it could make a nice meter for tty loops. But I wonder what its original purpose was. I would have thought something TTY related would be +/- 100mA not just 0-100mA


73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos


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