Noise

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  • Problem
  • Updated 1 week ago
I have started to have a 5-7 s noise figure on 80/40 meters and a 3 s on 20 meters "with" or "without" the antenna disconnected.  It appears to be noise and not interference.  Does anyone have any clues, hints, ideas, suggestions, etc.?  I have tried to call Flex on different days, but have only gotten the machine.  Thank you for any assistance.
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Joseph Rodick

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Posted 1 week ago

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Joe Conover

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Get a 30 foot coax with connectors on each end—-
Turn radio on and move Coax all around till you locate strongest Noise level -Might be a Wall Wart like cell phone charger
Or drill charger cycling on and off
Coax acts like magnet to locate noise —
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Homer1952

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What was the noise S level before the problem arose?  My 6400 is always a ~S5 with no antenna connected.  It is how Flex decided to design the S meter which I have always hated.  There is a lot of discussion on this site about that.

Also, you should power the Flex with a 12VDC battery, completely shut down the house & remove the antenna to see if the noise is inside the home.  Good luck - Bob

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Joseph Rodick

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This has just started in the last month or so.  I am now unable to hear weak stations because of it.    I used to have a 1-2 s on 40 meters most of the time when the band was good. 
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Joe Conover

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It sound me it’s something you caused your self maybe new wall wart ///
Start first buy turning all house breakers off but radio breaker
It could be your power supply going bad also
Joe
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Joe Conover

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Why the always 5 S noise. Homer that crazy on Flex part
(Edited)
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Doug

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Have you tried another radio in place. It seems you are thinking it is a Flex problem
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Joe Conover

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Good idea
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Bill -VA3WTB

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What model of Flex?
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Lasse Moell

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If you have high noise with no antenna attached, it likely to be related to your radio. Now, the S-meter value is direct related to the filter BW, larger BW "more" noise. But you will also see higher noise if you have the preamp off or have attenuator activated. If your settings are just as they always been, but the readings are much higher, I suspect you do have an hardware issue. Also do not forget to check your PSU, especially if it is a switching type. And just to make it certain there is nothing picked up for around, use a 50 ohm dummy load right at the radio, or at least use known good coax to the load.
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K3SF

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FYI...always best to let people know what flexradio model and version of software of the radio.

SO....not sure what radio you have,
but
there has been  a PEN issued for 6400/6600

The PEN addresses two issues

1.  The ADC heatsink which result in high noise level

2. The  Preamp enhancement for dynamic range



https://community.flexradio.com/flexradio/topics/product-enhancements-pen

one symptom of ADC heat-sink issue...noise...

Paul K3SF


(Edited)
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Joseph Rodick

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It appears from reading the link that my A/D converter has got an issue and may need the heatsink or replacement of the PCB.  I have been trying on and off for days to talk to someone at Flex, but every time I call i get only the voice mail.  I will try again tomorrow.  Thank you for the link and the information.
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Steve K9ZW, Elmer

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Leave them a message - they have always called me back.

But if you actually think your radio (I think I missed what model you have BTW?) has a fault then jump start the process by opening a Help Ticket.  That is the process that will get you where you want to be.  That includes a PEN upgrade if your radio needs it.  

GL and 73

Steve
K9ZW

Blog:  http://k9zw.wordpress.com
(Edited)
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Doug

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The best and quickest and maybe only way anymore to reach Flex with a radio issue is just email them or open a help ticket. I recently needed help with a DAX issue and within 2 hours or less after doing just that Tim was in contact with me. In less than 4 hours the same day Tim fixed my problem and all is well. Just incredible support from the Flex team.