[Milsurplus] Dual Input Voltage Dynamotors

[Scott Johnson]

Motorola used the flat dyno as well, I have a twin V that has one. Uses 
a vibrator for RX.

Scott

gl4d21a at juno.com wrote:
> Back in 1955, GE introduced the Progress Line series of 2-way 
> radios.  For the high power 25-50 MHz transmitter, a dynamotor was 
> required, as the solid state power switching supply did not appear 
> until 1959.  Carter manufactured a 600 volt, 300 ma. low profile 
> dynamotor with two independent 6 volt primary windings (with 4 
> brushes).  These were paralleled  for 6 volt operation (and drew 
> about 50 amps) and connected in series for 12 volts.  There were many 
> of those radios sold, and a lot of the transmitter and receiver 
> strips still floating around, but I have not seen one of the 
> dynamotor power supplies in over 25 years, probably longer.  I saw 
> fewer Motorola radios, but I believe they had a dual voltage round 
> dynamotor in the same time frame, and adopted the 'flat' design 
> later, but that may be fiction.
>
> 73,
> George
> W5VPQ
>
>
> ________________________________________________________________________
> Try Juno Platinum for Free! Then, only $9.95/month!
> Unlimited Internet Access with 1GB of Email Storage.
> Visit http://www.juno.com/value to sign up today!
>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
>