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Radio Equipment Installation Forum - Forum for discussing how to install radio communications equipment in Mobile, Base, Command Post, EOC, etc configurations.

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Old 09-06-2018, 4:03 PM
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Default Power supply for base station

Good Afternoon....

Looking for a recommendation to power a total of 4 CDM1250 mobiles for base station operation. Astron command post modules are not really an option as the radios will be rack mounted at a desk. I have one inverter now powering 1 radio but Iím concerned about running 4 individual inverters to the same power source. Thanks for the help.
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Old 09-06-2018, 4:30 PM
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Quote:
Originally Posted by ht396jm View Post
Good Afternoon....



Looking for a recommendation to power a total of 4 CDM1250 mobiles for base station operation. Astron command post modules are not really an option as the radios will be rack mounted at a desk. I have one inverter now powering 1 radio but Iím concerned about running 4 individual inverters to the same power source. Thanks for the help.


Inverters???? Inverters convert DC to AC. What is the power available? 110 VAC or 12 VDC?

It it's AC, why screw around? I bought three NIB Motorola power supplies for $150.
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Old 09-06-2018, 8:38 PM
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Is there a possibility that all 4 radios could be transmitting at the same time?

What wattage are the radios?

Do you need battery backup?

Does the power supply need to be rack mount?
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Old 09-07-2018, 1:32 AM
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Per Motorola spec sheet, the CDM series can use up to 1.5 amp in receive. A 45 watt Radio could draw 13.5 in transmit. A low band 60 watt radio could pull 17 amps in transmit. With this info, you could have 6 amps draw if all 4 radios were receiving with the volume wide open. But average would be no more than 4 amps in receive for all four. If you only transmit on one at a time, you would need no more than 17 amps for 45 watt radios and no more than 20 amps if you had a low band in the mix. So I would suggest a good quality 20 amp supply would fill the needs.

Mike
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Old 09-07-2018, 3:09 AM
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If anything i would suggest 50 amp--even if he is txmitting with 1 radio that leaves 3 receiving so 13.5+4.5=thats 18 amps 20 amp is cutting it close to heat up fast

even if he has 2 txmitt at the same time 13.5x2=27amps +3 more amps (2 idel radios)=30 amps Total/ if he got a 50 amp thats more than enough for 4 radios plus a few other 12 volt items to use
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