Along this same line, I still have a couple of Motorola 12v to 6v power
converters. They were of the synchronous vibrator design, with no rectifiers.
The primary vibrator contacts closed in synchronous fashion with the secondary
contacts on the lower voltage winding giving you 6 volts output with some hash
which is filtered out. Talk about dinosaurs -
I don't know what they would do with 24 volts on the primary instead of the 12
volts they were designed for, but bet the vibrator would not last long - HI
73 - Jim W5ZIT
Captainlance <[EMAIL PROTECTED]> wrote:
Speaking of odd ball power problems,
I have a new in box Astron model 4812-20 converter. 32 to 56 volts input,
13.8 volts out @20 amps. Great for shipboard or railroad use... $40.00
shipped anywhere in USA
lance N2HBA
----- Original Message -----
From: Dave VanHorn
To: [email protected]
Sent: Monday, March 24, 2008 11:55 PM
Subject: [Repeater-Builder] Re: 24 vdc to 12vdc
Someone else mentioned the Astron converter.
You can also buy inverters (usually online) designed for 24V input,
and use that to run a small gel cell charger, with an appropriately
sized gel cell. Neither the charger or the battery need to be big,
unless you need to transmit a lot. The charge "refills" the battery
when you're listening, or when the radio is off.
Resistors are a bad idea, and tapping power from one battery is
another bad idea, not just because of the damage to the high side
battery, but the transients in a 24V system are double that in a 12V
system, and your 12V radio has likely not been designed to live in
that environment.
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