Radio > EmComm/Emergency Power
Old Telephone Generator
TexasRadio:
Not sure if this has been addressed before or not for EMM COMM Power supply.
Since I don't have one, would an old telephone power generator work coupled with capacitors in a pinch?
I don't know about the voltage / amp output on these things.
Curious....
73
BTPost:
Telco equipment usually runs on 48 Vdc... They usually get that from a Battery Bank, that is charged from that Generator, while supplying Power to the Telco gear. In this way the Telco Gear stays powered even if the Genset goes offLine, until backup Sources of Power can be brought OnLine.
Tevin:
--- Quote from: TexasRadio on January 05, 2015, 10:54:12 AM ---Not sure if this has been addressed before or not for EMM COMM Power supply.
Since I don't have one, would an old telephone power generator work coupled with capacitors in a pinch?
I don't know about the voltage / amp output on these things.
Curious....
73
--- End quote ---
What is a "telephone power generator"? I've been in the business 25 years and have never heard the term. Do you mean a 48 volt power supply? A "generator," in the generic definition, produces AC current. Slapping a few capacitors on the output does not suddenly make it a DC source.
Most telephone equipment is over engineered and will last more than a lifetime; the tradeoff is gear that is heavy, large, and difficult to work with. Also, the protocols used by the telecoms do not lend themselves well to "civilian" applications (proprietary connectors & fuses, strict grounding requirements, lack of spare parts, to name a few).
Example: There is one very popular (and very old) Bell System power supply that must have the filter capacitors discharged before it can be serviced, and to do this safely you need a special tool and follow a detailed procedure. Failure to do so can result in a shock that will throw you right on your ass, if you're lucky. There are thousands of them still in service.
Old phone stuff can be adapted for hobby/radio purposes, but I would not recommend it unless you are experienced with the many quirks of Bell/Western Electric equipment or at least have very high level electronics skills. It's definitely not for newbs.
spacecase0:
I have a generator from a hand crank phone,
never tested it for output,
it kind of lights up light bulbs,
you would sure need a voltage regulator with it,
but it sure rings a bell quite well
ghrit:
--- Quote from: spacecase0 on January 05, 2015, 07:23:26 PM ---I have a generator from a hand crank phone,
never tested it for output,
it kind of lights up light bulbs,
you would sure need a voltage regulator with it,
but it sure rings a bell quite well
--- End quote ---
http://www.oldphoneman.com/FSMagnetos.htm
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