389
Mudduck
Posts: 39 
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Post by 389 on Mar 25, 2024 8:54:50 GMT -5
Just wondered how others tune SSB RX. Do you peak T501 and T502 ? I find when peaked the white noise seems excessive to the signal, and I detune for the best signal to noise ration,
so I can hear a lower levcel signal with minimum noise competing with it. I do the same with AM, finding the white noise there also excessive when T300, 301, 302 peaked etc.
389
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Sandbagger
Administrator/The Boss 
Posts: 6,250
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Post by Sandbagger on Mar 25, 2024 19:59:01 GMT -5
Just wondered how others tune SSB RX. Do you peak T501 and T502 ? I find when peaked the white noise seems excessive to the signal, and I detune for the best signal to noise ration, so I can hear a lower levcel signal with minimum noise competing with it. I do the same with AM, finding the white noise there also excessive when T300, 301, 302 peaked etc. 389 I run across that issue frequently on newer RCI style radios. The front end coil, I typically detune from peak, as the signal/Noise ratio is better. However, I can't recall having similar concerns with the D201. Most of the better tube rigs have a fairly low noise floor, and I've never had to "detune" any of the slugs. |
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Post by 2600 on Mar 25, 2024 23:32:43 GMT -5
As a rule, only the front-end adjustments in a receiver will affect signal-to-noise ratio. Once the signal passes into the first mixer stage, the noise content is pretty well established, and later stages of the receiver get peaked for max signal. Never have seen the downstream adjustments have a separate effect on noise and signal.
This is where a SINAD meter shines. It can distinguish signal from noise as well or better than your ears. Peaking front-end adjustments using only the S-meter will tend to exaggerate the receiver's internal noise level, but mostly only in solid-state radios. Tube radios don't seem to exhibit that trait.
Sure don't know why.
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