Rf sampler smoked out my radio

[805 california]

Alright soo I had an electrician come check my outlets and he said everything was good. I got another scope and a frequency counter and same thing. When I have my power supply hooked up to my radio I get a reading of 25 volts DC from ground on radio/power supply to bnc connector on scope/frequency counter. Why am I getting 25 volts DC from power supply to ground on scope and fc??? Could it be an issue with the 13.8 v DC power supply. I'm so confused

 

[Captain Kilowatt]

Alright soo I had an electrician come check my outlets and he said everything was good. I got another scope and a frequency counter and same thing. When I have my power supply hooked up to my radio I get a reading of 25 volts DC from ground on radio/power supply to bnc connector on scope/frequency counter. Why am I getting 25 volts DC from power supply to ground on scope and fc??? Could it be an issue with the 13.8 v DC power supply. I'm so confused

Maybe you mentioned it somewhere above but if you did I missed it. WHAT kind of power supply is it?

 

[805 california]

Maybe you mentioned it somewhere above but if you did I missed it. WHAT kind of power supply is it?

It was the power supply this whole time. Got a new power supply and no more problems. Case closed

 

[222DBFL]

Just out of curiosity, what power supply was giving you the issue? Make, model, and so on? Again. Just curious. Glad you got it resolved. And thx for any and all reponses. Have a good day. I would venture to say you're pretty happy! Again, have a good one and keep at it!!

 

[Captain Kilowatt]

Maybe you mentioned it somewhere above but if you did I missed it. WHAT kind of power supply is it?

It was the power supply this whole time. Got a new power supply and no more problems. Case closed

Would you mind still answering the question? I had a thought last night when I asked it and was wondering about the chassis ground not being common with circuit board ground AKA floating ground. Some supplies are like that and some radios actually are like that to allow use on + or - ground systems.What was the type and model that you were using and what is the type and model of the new one? Inquisitive minds want to know.

 

[805 california]

The one giving me 25 volts DC was a Pyramid. Then I went to radio shack to get some parts and was talking to the guy there about the 25 volts. He said there should no way be 25 volts from ground to ground and he insisted that I bring him my power supply so he could look at it ( he was VERY intrigued). Long story short I bought a radio shack power supply 13.8 vdc-19a. And everything is working amazing!

 

[vkrules]

"14 AMP SURGE POWER SUPPLY PS-14K LINEAR <15 AMPS (TRANSFORMER TYPE) Power Supply" that certainly shouldn't do it.Would love to know Why ! ( still some sort of ground issue)

Don't throw away that supply just yet.

So you dont run any sort of station ground or earth! Otherwise you would have seen it when you plugged the antenna in.

 

[Captain Kilowatt]

I'm still at a loss why it is showing the proper voltage output yet shows 25 VDC between it's chassis and the scope chassis.

 

[Yeti Communications Ltd]

 

[vkrules]

Anyone got a circuit for this supply?

So frustrating ,you know if you had it in your hands you could most likely fix it in ten mins.

 

[Yeti Communications Ltd]

Anyone got a circuit for this supply?

So frustrating ,you know if you had it in your hands you could most likely fix it in ten mins.

above your post

 

[805 california]

Yeah very weird. With just the radio it shows 13.8 volts on the meter and -13.8 volts and the radio runs fine. But if I go ground on power supply terminal to other test equitment is shows 25 vdc and 11 vdc from hot on power supply to test equitment. I got a radio shack power supply and it shows 0 volts from power supply to test equitment

 

[mb91w126]

Anyone got a circuit for this supply?

So frustrating ,you know if you had it in your hands you could most likely fix it in ten mins.

It would be great if you could diagnose the problem and post your analysis for my education.

 

[vkrules]

Not trying to be a smart arse I'm just as curious as everybody else .Ok I'll go out on a limb here! Looking at the diagram the center tap on the secondary is hot if it loses ground connection.
So most likely 2pin plug fitted to a 3wire lead or a bad connection inside PSU.( that would explain the ac reading but not the dc)

I'm sure there are better minds than mine reading this thread, how about some opinions

Thanks for the circuit Yeticom, must have posted at the same time.

 

[805 california]

Not trying to be a smart arse I'm just as curious as everybody else .Ok I'll go out on a limb here! Looking at the diagram the center tap on the secondary is hot if it loses ground connection.
So most likely 2pin plug fitted to a 3wire lead or a bad connection inside PSU.( that would explain the ac reading but not the dc)

I'm sure there are better minds than mine reading this thread, how about some opinions

Thanks for the circuit Yeticom, must have posted at the same time.

So I plugged the three prong power cord into a cheater plug with 2 prongs into the outlet and no more problems. Or I could just cut the ground wire inside the power supply. My conclusion is that there is a serious design flaw and the manufacturer is not aware of it yet. I will be standing by for my recall.