[MRCA] ACR-5 Mobile

[wf2u at starband.net]

Al,

There is no MD-7 dynamotor for 12/14 Volts...

Your options are:
1.  Install a 24 VDC genearator in your vehicle, with a charging system
for 24 V batteries (independent of your original 12 V system), and use
that to power up your 24 V radio equipment.

2. Get a military surplus (they appear on ebay quite frequently) 12 V to
24 V solid state inverter - they have 15 A current output if I recall -
feed that through a diode to 24 V batteries (as to prevent the batteries
to pump voltage into the inverter and to trickle charge the batteries) and
feed that to the ARC-5. The starting current of the dynamotor is way
higher than the 10 A max steady state current - it can be easily 5 times
or more momentarily - so you want those batteries connected, because
they'd supply the starting current.

3. Find the 12/24 VDC input dynamotor supply for the TCS and feed the
ARC-5 modulator/TX and RX with the high voltages from that supply
(kluge...) but you'd also have to rewire/retube the ARC-5 equipment for 12
V...

You should get at least double the 15 W rated power output (the rating
means guaranteed for 15 W minimum at the minimum  voltage of the battery,
before recharging).

Good luck and have fun!

73, Meir WF2U
Landrum, SC
> Troops,
>
> I'm starting to contemplate taking a stock AN/ARC-5 mobile so people can
>  see and hear it.  This would be a single transmitter and receiver,
> probably on 75 meters, plus an MD-7 modulator, RE-2 antenna relay, and
> control boxes as needed.  I have all of above, but need a single
> transmitter rack and mount, MT-68/69.
>
> Does anyone know the actual output of the TX?  Manual sez 15 watts
> carrier, but I suspect a pair of 1625's with 550 on the plates should do
>  at least twice that.
>
> Also, there the issue of primary power.  I'm looking for a good way to
> get 28 volts at about 10 amps from 14 volts with enough reserve to spin
> up the TX dyno.  I don't suppose anyone has 12/14 volt dynomoters for
> MD-7 and RX lying around?
>
> Any help or suggestions appreciated.
>
> Regards,
> Al
>
> --
> Al Klase - N3FRQ
> Flemington, NJ
> http://www.skywaves.ar88.net/