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I am currently looking for a power supply to power a 110w Spectra, what would YOU suggest??
And what do you think of the one above?

Thanks

Check the Amps on the supply I think you would need at least a 20 amp supply. Maybe more. I am currently running a Vertex Mobile at my place, with a 20 amp Max Pyramid power supply. The radio when transmitting at about 40 watts, requires 13-17 amps, so this works for me, check the specs on radio is my best advice then choose a power supply to accomidate.

To power that 110w radio you'll need a 35A supply. The radio probably draws 26-28A while transmitting (my Syntor X draws 28A) and you need some headroom, so a 30A will not be adequate.

The supply shown in the photo is not big enough. I can tell that just by looking at the connector that uses only two conductors. But it should be marked as to its exact capability.

wa2zdy wrote:To power that 110w radio you'll need a 35A supply. The radio probably draws 26-28A while transmitting (my Syntor X draws 28A) and you need some headroom, so a 30A will not be adequate.

If you can find one, I would recommend Motorola's old R1011B power supply.
That thing is old (1960's technology) & heavy (70 lbs), but the specs are for 600 W continuous 800 W intermittent power. That gives you the capability to draw 35 Amps @ 13.8 Volts forever.

DJP126 wrote:

wa2zdy wrote:To power that 110w radio you'll need a 35A supply. The radio probably draws 26-28A while transmitting (my Syntor X draws 28A) and you need some headroom, so a 30A will not be adequate.

If you can find one, I would recommend Motorola's old R1011B power supply.
That thing is old (1960's technology) & heavy (70 lbs), but the specs are for 600 W continuous 800 W intermittent power. That gives you the capability to draw 35 Amps @ 13.8 Volts forever.

Dave, are you sure about the era on the R1011? I ask because I own one, and most of the internal date codes are early-to-mid 80's.

I seem to recall first seeing the 1011 in the catalogs along about 1978. Prior to that, Motorola had a much older unit. It sticks in my memory because it didn't use electronic regulation at all, had a huge rheostat on its front panel, and could double as a lead/acid battery charger.

Anyway, you're correct: The 1011 is one heck of an impressive beast, utilizing an odd hybrid of linear and switching technology in its design. I bought one mainly because it can also power 24 and 32V radios if need be.

Keep the peace(es).

Hi Bruce, The design of the original R1011AA came from the late 60's and early 70's before it was put into production. It had (as you know) only a couple of simple ICs. The rest were descreet components with supporting circuitry. It stayed in production until the 90's and Motorola has yet to come up with an equivalent suply (and since they are out of the test equipment business, they probably never will).

R1011B power supply can't be beat.

The A version was miserably unstable at lower voltages and I converted it from an AA to a B version to get around the regulator problems. Mostly plug and play by changing the final switching transistors and the regulator board.

I went through many transistors and balancing resistors before getting it right. DJP knows this story. We spoke about it several times.

George

While we are talking about power supplies, anyone know the ratings for the BPN1003 and BPN1004 power supplies? (Old centracom stuff)