Astro Spectra Base station Power Supply

[Will001]

Howdy y'all I'm about to get a Motorola Astro Spectra UHF 25 Watt radio, and I want to use it as a base rig for my local GMRS repeaters. I have a Motorola power supply (Model # is HPN 1007B), and I was told it could handle 25 watts, but I am still suspicious if it can or not. If someone could tell me if it can or can't handle 25 watts, and what model to get if it dosen't work, that would be great!

 

[Project25_MASTR]

It's rated at 5A peak. If you have access to an Astros Spectra service manual (you can find it on Google more than likely) you can look up what the radio is actually rated to draw current wise.

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[cmdrwill]

10–25 Watt UHF radio.:
Standby @ 13.8 V: 0.7 A
Receive at Rated Audio @ 13.8 V: 3.0 A
Transmit @ Rated Power: 7.0 A

So you would need a 10 amp power supply to be safe, power supply rating(s) can be confusing the way are listed.

 

[Will001]

Thanks for the replies! I should have mentioned that the power supply says "10 amp surge" on the bottom. I have another 10 amp power supply I've transmitted 30 watts from my HF rig with. If I use that, I know I'll be safe.

 

[Project25_MASTR]

30W SSB and 30W FM are two completely different things.


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[SteveC0625]

RF wattage (of any kind) does not equal DC wattage. You need to know the current requirements of the specific radio to determine the adequate power supply size.

True story: Over on another unnamed forum form hams, someone asked the required fuse size for a 40 watt Motorola M-1225. I gave him the correct fuse size needed. Instead of just installing the recommended fuse, he took my number and applied the w/v=a formula and installed a much smaller fuse which, of course, resulted in blown fuses as soon as he keyed up the radio. I ended up having to verbally call him out for using the wrong formula and disregarding the correct info that I gave him up front. He kept insisting that he was correct using w/v=a. It took some strong words from me, and validation from other posters to bring him back to reality.

The manufacturer's specs, especially for legacy radios, are easily found on the the net for this purpose.

 

[cmdrwill]

RF wattage (of any kind) does not equal DC wattage. You need to know the current requirements of the specific radio to determine the adequate power supply size.

The manufacturer's specs, especially for legacy radios, are easily found on the the net for this purpose.

Which I looked up and posted .Right from the factory service manuals and our own testing. 7 Amps.

And the second part, well that was not on the "HAM" test, so how would they know that, as you mentioned, they do not listen very well........

Bottom line: a DC power supply capable of providing 13.6 volts DC at up to ten amps intermittent, AKC ICAS, duty rating.