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TOPIC: Understanding MB-1 Audio Input/Output

Understanding MB-1 Audio Input/Output 31 Dec 2020 13:07 #1

  • John-KC2QMA
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I am trying to understand the audio signal flow in the MB-1 and the advantages or disadvantages of using front panel connections verses using an external USB audio interface.

I understand that there is always going to be some small amount of latency with audio I/O in an SDR radio but with today’s latest ASIO driver based audio interfaces latency can be incredibly low.

So my question is:

Do the PHONES, MIC 1 and MIC 2 connectors on the front panel connect directly to the SDR board or to the PC?
Transceiver: MB1 Prime 2021
HF Amplifier: Ameritron AL-1200
HF Antennas:10-80 Vertical, 10-80 Fan Dipole
VHF Antenna: Commet GP-9
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Understanding MB-1 Audio Input/Output 06 Mar 2021 19:30 #2

  • Relampago
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Hello John,

Did you ever get an answer to your question? I would like to know this same thing.

I'm trying to find help in the threads for my MB1 audio latency. Basically when I have "Monitor" turned on there is a horrible delay from the Mic input. I found that unticking the Mic AGC helps, but the delay is still significant. I'm about to post another topic. I appreciate any advise you might offer. 73, Jack
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Understanding MB-1 Audio Input/Output 06 Mar 2021 21:15 #3

  • g0cgl
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Do not extend the attack and release times of the compressor in order to achieve less latency. Many more tips are found in the UMA.

All said and done though, with MON on there will be an element of delay. In my MB1 I would not, after making the settings in the UMA, describe it as 'significant' but it can be disconcerting at times.

Until recently this was a common characteristic of SDR radios. At least one competitor has overcome it and I daresay EE have done some remedial work too, so I hope for improvement in ESDR3.
Last Edit: 06 Mar 2021 21:19 by g0cgl.
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