Archive for the ‘Telephone’ Category:

2018-01-02 Telephone Bell

We were discussing gong type telephone bells on FB group Bell Telephone… Back maybe ten years ago I snagged an AT&T bell out of a bldg before the bldg was remodeled.  It was a bell without an enclosure, the two bells were exposed, with the clapper between them.  It connected directly to the incoming line

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2017-12-21 Message Waiting Light Headaches

From FB group Bell Telephone Ohhhhh, Ed Vaughn, you gave me a big headache.  Those message waiting lights… We had a 1200 baud MW line directly from the CO to our PBXes, and one PBX then distributed it to dozens of others in the district over the network, not by ethernet, but by XNS over

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2017-11-21 Phones And Line LevelsĀ 

From FB group Bell Telephone… In the days of analog phones like 500s and 2500s, Ma Bell had the phone matched to the line, so whatever the line length was, it compensated and the signal levels were very uniform, it worked great. Then came along the full duplex digital system, and everything went to hell.

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2017-11-04 Change a Princess Phone Light To LED

From FB group Bell Telephone… a reply to Lucky225 I fixed the same problem.  A single 1N4003 rectifier diode in series with the LED.  If you think there’s too much flicker, add a 220 uF capacitor across the LED.  The LED must have a resistor in series, start with 1000 ohms (brown, black, red, gold

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2017-10-19 Santa Ana College Early History of Datacomm

From my post to FB group Bell Telephone… We were having problems with one of our 4 wire point to multipoint datacomm circuits.  Every morning at a little after 9 AM the circuit would go down.  I called in the problem and a Pac Bell tech came out, but couldn’t find a problem.  Next day,

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2017-10-16 AT&T Breakup

From comments on FB group Bell Telephone.. Ed Vaughn said: That story makes me ill.  Why break what was perhaps the best-run machine in the world? I replied: Why?  Well, it wasn’t the first time AT&T was forced to comply with government’s decisions.  Like you said, it was a machine, and whether or not it

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2017-09-21 Kid Was Totally Into Telephone Central Offices

Posted to FB Antique Telephones group as a reply to Kevin J. Fitzgerald  I helped some students in our computer lab, and one high school kid, I think his name was Robert, was totally into phones.  He had written a Basic program that printed a list out, with the various exchanges in the 714 area

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2017-09-02 Switchboard At OCSD Regional Training Center (Sept 15)

From my comment on the FB group Bell Telephone  Pat Chicas I worked for RSCCD, which owns the Sheriffs Training Center.  Man, I would have loved to slap their hands!  The OCSD installed their phone system on prem, and we supplied the data circuits, so our patch cords and theirs shared the same patch panels

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2017-05-20 Telephone Line Kicker Meter

From a 2017-06-10 comment regarding a Weston capacitance meter on FB group vintage test equipment  Reminds me of the ” kicker” meters the phone techs used on the phone lines.  There was a polarity switch that reversed the pair, and the tech could tell about the line from the kick the meter needle gave when

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2016-06-16 Computer Microphone

I came across a schematic of a computer microphone from Circuit Exchange. This interested me because I have never had any success with using the microphone jack found on the back of desktop PCs. First off, the typical microphone jack seems to be a three conductor, 3.5 mm ‘headphone’ jack, with the tip being the

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