F6300 unstable LF carrier?

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  • Question
  • Updated 3 years ago
Hi, looking for other peoples check/feedback please.

I know I should not expect too much from the F6 series below 1MHz, but I have found two odd unstable carriers (looks like SMPS warble to me). They are both around 800-815kHz (see example pic). They wobble around a bit and sound like an unstable SMPS.

However, the really odd thing is that the signals is still there, and just as loud with no antenna or coax connected to the flex RF socekts....puzzled, what does yours look like please?

I guess I may have a QRM source, but other than the PC (can't turn off for obvious reasons) nothing else is close enough to generate that high level of signal with no antenna connected.

There is no other carrier/qrm showing from 150kHz to 1MHz with no antenna connected, so these two really stand out. 

Thanks, Steve G1XOW
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Steven G1XOW

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Posted 3 years ago

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Jim, KJ3P

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Same thing with my 6300, precisely as you describe.
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Martin Ewing AA6E

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What kind of power supply are you using?  It could be switching noise conducted in on the power cable.  Check with a different supply, preferably a linear one, or even a battery.
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Steven G1XOW

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same on battery power with no switch mode in the shack (ever). steve from Flex has confirmed it as two small SMPS inside the Flex. Thanks.
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Corey/ KC0YNS

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I'm also receiving the same on my Flex 6300 Although I wouldn't have noticed until reading your post...
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Dave Dave

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6300 here.... same but at .799 and .807.1
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James Whiteway

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Time to calibrate dave dave! Your off too much.
:-)
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Dave Dave

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recalibrate my radio and it is exactly .800 but not seeing the one above

a minute later it has moved to .799.1 ...... its the wobble with no antenna

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Tim - G7GFW / F4VQP

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Not seeing it here
Tim