Power Supply throwing lots of RFI

[Ishmole]

Anyone else having this problem? So far I have had 2 go bad, the other was on the 996P2. It kills any nearby AM radio and also is killing nearby wireless internet. I have a box full of old wall warts at 12v but am afraid to use them because they read as high as 16 V DC on the voltmeter.
Mike W2MDM

 

[nessnet]

... they read as high as 16 V DC on the voltmeter.

Not under load though.....

 

[RFI-EMI-GUY]

are you talking about the OEM wall wart that originally shipped with you 536?

 

[iMONITOR]

Anyone else having this problem? So far I have had 2 go bad, the other was on the 996P2. It kills any nearby AM radio and also is killing nearby wireless internet. I have a box full of old wall warts at 12v but am afraid to use them because they read as high as 16 V DC on the voltmeter.
Mike W2MDM

Hi Mike:

I have a brand new in the box Jameco Model No. DFU120150
Product No. 249244
120VAC 31W
12VDC 1500mA (enough to power two scanners)
UNIDEN compatible barrel connector
Regulated, Linear
Wall-Wart power supply


I can post it in the classifieds if your interested? $15 shipped US Prioirty Mail

 

[Ubbe]

but am afraid to use them because they read as high as 16 V DC on the voltmeter.

No problem as the devices in the scanner that are connected directly to the DC jack can handle at least 24 volt, but if it goes up to 18v the protection diod in the scanner will shortcircuit the powerline.

/Ubbe

 

[Ishmole]

are you talking about the OEM wall wart that originally shipped with you 536?

Yes.

 

[jaspence]

Your voltage reading is common on cheap power supplies. They rely on circuitry in the radio to lower the voltage to the required amount. If you check a 6 volt supply, it read up to 9 volts. You can buy a good power supply with controls for varying the voltage, but they cost considerably more for an accurate one.

 

[RFI-EMI-GUY]

Yes.

Well upon that bombshell I have added some ferrites to my wall wart and wifi dongle and moved them both far from the radio. Maybe the BER will improve. I have noticed that the receiver will receive with the antenna removed which means the power and/or USB are not well isolated and whatever signals and noise they pull in, the receiver will have to contend with.