[ARC5] Vibrator Power Supplies

[Sandy]

As I properly remember the vibrators usually worked at a frequency of around 
115 cps.  60 cycles is too low!  The same thing happens when you attempt to 
use the old aircraft type transformers which operated at 400 cps on a lower 
frequency.  There isn't enough iron to make the transformer operate properly 
on 60 cps.  Way back in the post war  (WW2) Panama Canal Zone (where I lived 
for a few years as a child) the power was 115 volts at 25 cycles.  The 
transformers for all the gear like Johnson Viking 1 (which was then very 
popular!) worked from 50-60 cycles but not on 25 cycles!   Hams were 
"loaned" a transformer which was used outboard of the equipment that 
supplied the same required voltages for the Viking 1 but with a 25 cycle 
(Hz) operating frequency.

I suspect the trouble you are having with the old RCA Carfone stuff doesn't 
want to supply the rated voltages at 60 Hz instead of 115 Hz  (which I 
recall is the frequency the vibrators operated at.)

73,

Sandy W5TVW

-----Original Message----- 
From: Robert Eleazer
Sent: Friday, December 07, 2012 7:35 AM
To: arc5 at mailman.qth.net
Subject: [ARC5] Vibrator Power Supplies

Two questions:

1.  Why did they not use vibrator power supplies instead of dynamotors in 
WWII?  They ought to be cheaper and easier to build.

2.  I have the transformers out of an old RCA Carfone vibrator power supply. 
Tried to make a DC power supply out of them.  They do not work all that well 
with 115V 60Hz on the secondary.  Anyone know why?

Wayne



______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.2793 / Virus Database: 2634/5943 - Release Date: 12/07/12