Why does ssb not utilize the anl function like am does?
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Why does ssb not utilize an anl circuit?
- Thread starter nfsus
- Start date
I am not an engineer, but I think the ANL circuit, or Antenna Noise Limiter, works on the carrier wave to maintain a constant level of receive based on carrier wave. SSB does no maintain a constant carrier wave. Someone please correct me if I just shoveled a pile of BS.
ANL just clips noise peaks. Need steady (more or less) signal for that.
Not even the world's best engineers can change the laws of physics silly human......
The only radio I remember seeing with a ANL (Automatic Noise Limiter) active for SSB receive was the Siltronix 1011 series of radios.
ANL simply "clips" noise peaks to bring them down to the same amplitude as the voice modulation. Also tends to distort voice peaks, especially from an overmodulated station.
SSB radios really need the noise blanker. It's more effective, overall. The AM side will benefit from it as well. It's a more complicated circuit that costs more to include in the design.
And one more quirk. A cheap 3-knob radio without a switch marked ANL usually has that extra diode and resistors. Just won't let you shut it off.
The ANL switch is generally "backwards". To turn off the ANL the switch simply shorts across the ANL clipping diode. Opening the ANL switch turns that feature on.
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ANL simply "clips" noise peaks to bring them down to the same amplitude as the voice modulation. Also tends to distort voice peaks, especially from an overmodulated station.
SSB radios really need the noise blanker. It's more effective, overall. The AM side will benefit from it as well. It's a more complicated circuit that costs more to include in the design.
And one more quirk. A cheap 3-knob radio without a switch marked ANL usually has that extra diode and resistors. Just won't let you shut it off.
The ANL switch is generally "backwards". To turn off the ANL the switch simply shorts across the ANL clipping diode. Opening the ANL switch turns that feature on.
73