[ARC5] (no subject)

[MICHAEL ST ANGELO]

When I was powering the Dynamotor for my Wireless 19 set I fed my regulated power supply into a battery via a large power diode and fed the Dynamotor from the battery. The battery handled the starting surge and the power supply handled the running current. I increased the supply voltage to compensate for the diode drop.

This was a 12 volt dynamotor. You use a 24 volt or two 12 volt batteries in series for the 24 volt load. Try to equally change the 12 volt batteries before placing them in series.

Mike N2MS


> On July 28, 2017 at 12:33 PM George Babits <gbabits at custertel.net> wrote:
> 
> 
> 
> 
> Well, my take is that,  NO, you do not need a regulated power supply to run 
> a dynamotor.  Many commercial regulated supplies will see a dynamotor as a 
> short and shut down.  When I power a dynamotor from my Astron 35,  I put a 
> 1/2 ohm resistor in the line to start the dynamotor turning,  and then 
> jumper across the resistor once it spins up.  All you need is something that 
> will give you 28-30 volts no load, and "around" 24 volts under load.
> 
> Life was a whole lot simpler in the days of dynamotors and there is no need 
> to make it more complicated just because a ricebox wants a regulated power 
> supply.  And that really isn't true either because if you are mobile and the 
> engine isn't running, the radio will see pretty close to 12 volts.  Start up 
> the engine and it will see between 13 and 16 volts depending on the state of 
> charge on the battery.
> 
> 73,
> George
> W7HDL