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Author Topic: FT991 Noise Blanker working much better than FTdx3000  (Read 1442 times)
KB1SNJ
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Posts: 116




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« on: October 08, 2017, 12:19:47 AM »

Just noticed that the Yaesu FT991 NB works 100% on the same QRM noise which breaks through the FTdx3000 NB with a sputtering noise. I adjusted both NB levels, same result.

Could this be a defect in the 3000 somehow?

Here's a short example video I made of it:
https://youtu.be/mQi4ek16laA
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K6BRN
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Posts: 450




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« Reply #1 on: October 08, 2017, 05:35:18 PM »

Chris:

No.

Brian - K6BRN
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KB1SNJ
Member

Posts: 116




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« Reply #2 on: October 08, 2017, 09:28:10 PM »

So why the breakthrough buzz on 3000 and not 991 I wonder?
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K6BRN
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Posts: 450




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« Reply #3 on: October 10, 2017, 12:50:00 PM »

Chris:

Hard to tell without sitting in front of the radio and actually working through the noise problem.  The FT-991A and FTDX-3000 have a rather extensive set of interference mitigation options, and they all interact to a degree, including preamps, attenuators, filters, time constants, etc.  And the antenna setup and noise source would have to be identical for a decent comparison.  Ground and power connection differences can be critical, too, since a lot of "impulse" noise can travel through those channels.  If you are using the the radios in a mobile environment, perhaps the FT-991A is more optimized to that environment - I do not.

I have both radios at QTH#1, cross connected to a small "farm" of six antennas  through a switch matrix and have found both noise blankers to be similarly effective in MY noise environment.  But your environment is different.  However, I've used the FTDX-3000 blanker enough to know if it was "defective".  It's not.  And neither the FT-991A nor FTDX-3000 blankers are as effective as my external West Mountain Radio CLRdsp processor, in my noise environment.  None are "defective".  Just different.

Best Regards,

Brian - K6BRN
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KB1SNJ
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Posts: 116




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« Reply #4 on: October 10, 2017, 01:17:58 PM »

Thanks Brian, I can add that both are next to my couch, on same antenna (switch). I even moved the 3000 away from the astron PS in in case it was that. I can't think of any other apples to apples. I will keep testing and report any new discoveries.  This was surprising though as i assumed that the NB and DSP circuits are *probably* about the same in both radios.
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