BCD996P2 Power Supply

SCPD · Aug 17, 2015

Afternoon all. I just picked up the 996p2 and it is creating hash all over the lower HF bands. I would like to replace the stock power supply with the one posted below. Does anyone see any issues with specs for the replacement?

The stock power supply DC switching power supply 13.8V DC 750mA

The replacement DC Regulated Linear Wall Adapter 12 Volt 0.5 Amp

DDU120050F0981: JAMECO VALUEPRO: Power Supplies & Wall Adapters

Thank you for any and all help
Mike

WA0CBW · Aug 17, 2015

Looks like your short about 250 mA. The lower voltage probably won't make a difference but I would get one with a little more current capacity (at least 750 mA).
BB

jackj · Aug 17, 2015

Are you sure that hash is coming from the power supply and not from the 996's computer? A quick test would be to run the scanner on a battery.

SCPD · Aug 17, 2015

Wa0cbw: I will go with the 1 amp version. I think the tolerances should be ok with the +/- voltages as you stated.

Jackj: I don't have a battery to test it with. I see the hash/rfi as soon as i plug in the stock power supply. It happens while the unit is on and off.

I will try and post a before and after picture.

SCPD · Aug 17, 2015

Scanner is on and plugged in

Scanner is off. Power supply connected

Scanner is not plugged in but power supply is still in the wall

eaf1956 · Aug 17, 2015

I just run one of my scanners off the 35 Amp PS that runs the radios. I use the DC power cord that you use for mobile installations.

SCPD · Aug 17, 2015

I would prefer a wallwart but if i have to go with an external brick style PS then i have no choice.

Voyager · Aug 18, 2015

The advantage of getting a higher capacity PS is that you have room to add scanners if needed with no additional purchase. Stay away from the switching power supplies (wall wart style or otherwise).

My configuration is exactly what EAF posted.

SCPD · Aug 18, 2015

Thank you guys for all the input and advice. I'm going to try the wall-wart first. If that does not work i guess getting a 10-20amp box power supply will be my only option.

jackj · Aug 19, 2015

Mike,
Most scanners only pull about 1/2 amp at 13.5 volts. You could look on e-Bay for a 2.5 to 3.0 amp liner power supply. That would be big enough to run 3 or 4 scanners and it won't have the switching transients of a switching supply. But almost all of the cheaper supplies won't safely deliver their rated output continously so don't load them up to their full rating.

SCPD · Aug 19, 2015

Hey Jackj I 100% agree with you. I did buy this one for the meantime. If it does not work i will send it back and go with a 2-3 power supply. At the moment i will only be running 1 scanner but we all know that is usually not the case in this hobby.

DDU120100H4480: JAMECO RELIAPRO: Power Supplies & Wall Adapters

Voyager · Aug 19, 2015

Looks like that should work nicely.

jackj · Aug 19, 2015

Good luck Mike. You might end up with the same problem, it doesn't say that the supply includes noise filters on the output.

UPMan · Aug 19, 2015

The new Class VI power supplies required by DOE are switching power supplies. They are very efficient, but also very RF noisy. Older linear power supplies are pretty quiet (just 60 Hz noise to worry about, really).

SCPD · Aug 19, 2015

Hey Paul thanks for chiming in. Always a pleasure...

I have a Jameco (same specs just lower voltage) power supplies for my afedri-sdr and it is on the same line as all my other equipment (no issues at all). If it is the same as the stock Uniden then it's going back and will go with what you guys recommended originally.

Voyager · Aug 19, 2015

The link said it weighed over a pound, so it may be a non-switcher. Switchers are usually pretty light.

SCPD · Aug 24, 2015

Just received the power supply and have zero issues now. Thanks everyone for all the suggestions.

The stock power supply has an output close to 14.0v and the replacement is outputting at 12.5v
I don't think running it at 1.5v below the stock power supply is going to harm the radio.

jackj · Aug 24, 2015

Glad you solved your problem, Mike.

No, the reduced voltage will have no effect. It will be like running your scanner in your car without the engine running.

SCPD · Aug 26, 2015

Jackj: Thanks buddy. Glad i checked in here first before i did anything.

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