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Author Topic: Kenwood PS-30 Power Supply Excessive RFI  (Read 695 times)
KOP
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Posts: 245




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« on: November 28, 2017, 06:59:45 PM »

 The PS-30 was powering a TS-120 elsewhere in the house , on a different AC circuit/breaker.
On, it produced and extra 3S of noise in a TS-830S in another room , all across HF . Unplugged the TS-120 and still 3S noise.
Unplugged the PS-30 and the noise went away.
I repeated this with my Tempo 2020 , FT-857D , and a HW-101. All heard the interference.
I'm waving a probe around inside the PS-30 with one hand and scratching my head with the other and operating/tuning around HF with another...

Any suggestions would be appreciated 
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October 02, 2017, 07:53:41 PM
WA3SKN
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Posts: 6523




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« Reply #1 on: November 29, 2017, 06:02:05 AM »

Sounds like the PS30 has an issue.
What, if any, test eqpt do you have?  scope, meter, etc?

-Mike.
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N7EKU
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Posts: 722




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« Reply #2 on: November 29, 2017, 08:33:17 AM »

Hi,

Does the noise go away if the PS-30 is turned off with the front power switch?  Knowing this would help isolate the problem, as with the switch off, only a few internal components are connected.

If it's something in the regulator circuit, I can only think that maybe the zener is noisy?  I don't know if they can generate that much noise though.

Check that all the circuit board mounting screws are tight, and that the AC line filter caps all look OK.

73,


Mark.
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Mark -- N7EKU/VE3
K8AXW
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Posts: 6378




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« Reply #3 on: November 29, 2017, 11:08:52 PM »

Power supply RFI can be caused by an arcing solder joint.  Go over them with a suitable iron.
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WB0CJB
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Posts: 133




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« Reply #4 on: November 30, 2017, 08:24:35 AM »

I'd suspect an arcing joint too. I worked on a PS-30 and found the leads to the AC switch were barely soldered. After I finished working on the unit and did air tests with my TS-120S I had no interference at all.

The original problem was the blown 20A fuse.

WB0CJB
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K8AXW
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Posts: 6378




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« Reply #5 on: November 30, 2017, 10:10:30 AM »

CJB:  You have touched on a very valid possibility! 

I have found defective fuse holders that are not making good contact with the ends of the fuse. This results in hot contacts which further destroys the fuse holder and even the fuse. 

While I have never connected this problem with RFI, it certainly is possible.
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