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#11
September 11th 06, 03:16 PM
posted to rec.radio.cb
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cb recieve pre amp
On 4 Sep 2006 16:51:16 -0700, "Telstar Electronics"
wrote: +++ +++Slow Code wrote: +++ (avj 1) wrote in +++ : +++ +++ what's a good recieve pre amp? the Dosy or the Maco. +++ +++ +++ It's amazing the things people buy just to hear CB'ers better. +++ +++ Sc +++ +++The real problem is that the pre-amps don't accomplish anything. They +++are just a gimmick since they are unable to improve the signal-to-noise +++ratio. All they do is boost everything... noise and all... LOL +++ +++www.telstar-electronics.com ***************** Actually a well designed preamp will improve signal to noise performance. The real issue is that addign a preamp to a poorly designed receiver will dramatically lower the dynamic range of the first RF stage and mixer. Also at CB frequencies the usable sensitivity due to atmospheric noise is about 0.25 microvolt per meter. This is easily acheivable in even the poorest designed receiver. No preamp can compensate for loss of signal in the coax or do to a poor antenna design/setup. Once lost, it is gone. james |
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#12
September 21st 06, 01:41 PM
posted to rec.radio.cb
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cb recieve pre amp
"james" wrote in message ... On 4 Sep 2006 16:51:16 -0700, "Telstar Electronics" wrote: +++ +++Slow Code wrote: +++ (avj 1) wrote in +++ : +++ +++ what's a good recieve pre amp? the Dosy or the Maco. +++ +++ +++ It's amazing the things people buy just to hear CB'ers better. +++ +++ Sc +++ +++The real problem is that the pre-amps don't accomplish anything. They +++are just a gimmick since they are unable to improve the signal-to-noise +++ratio. All they do is boost everything... noise and all... LOL +++ +++www.telstar-electronics.com ***************** Actually a well designed preamp will improve signal to noise performance. The real issue is that addign a preamp to a poorly designed receiver will dramatically lower the dynamic range of the first RF stage and mixer. Also at CB frequencies the usable sensitivity due to atmospheric noise is about 0.25 microvolt per meter. This is easily acheivable in even the poorest designed receiver. No preamp can compensate for loss of signal in the coax or do to a poor antenna design/setup. Once lost, it is gone. james Yep, unless your rx has a truly awful frontend even the best preamp is useless or worse. In this case you would probably be better off getting your radio fixed or getting a new radio. |
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