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#6
December 1st 06, 11:25 AM
posted to rec.radio.shortwave
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AM recption notes.
In article .com,
"Steve" wrote: wrote: I found this web page while looking for a nifty audio filter I found last year. At the very least it gives food for thought. http://www.radiointel.com/phil/phils_radio_tuning_tricks.pdf Terry There are some helpful hints here, though I'm puzzled by the gripe this fellow has with synchronous detection. I personally wouldn't spend a lot of dough on any receiver that lacked it. I think a lot of people are sour on synchronous detection because they've bought and/or used a receiver that had a very poor implementation of it. When sync detection is done right, as it is on Drake's R8B, then it will sometimes do more to aid reception than all of these hints put together. But the good news is that we don't have to choose between synchronous detection and this fellow's helpful hints. We can have all of these tools at our disposal. Some of it is regional reception patterns, ax grinding, ignorance, and some of it is just plain nut case thinking focusing on the negative aspects because the sync circuit in radios are not perfect and ignoring the good performance that results most of the time. Listening to AMBCB in the car where I don't have a sync detector and home where I do sure makes me wish I had it in the car. I'm not talking about some small improvement I'm talking huge. Without sync you can have a strong but completely unintelligible signal for a few seconds to a few minutes a lot of the time in the evenings on any station not right in town or more than 50 miles away or in other words most stations. Usually the distortion is more like a few seconds length on SW but whether you miss a few words or miss whole paragraphs of the conversation it is very annoying. It depends on conditions of course but when you have selective fading turning on the sync detector makes an absolutely huge difference in reception even with the Sony 7600 portable. And of course if you have side band selectable sync detection with another station or local noise source generating interference to one side of a station you want to receive usually results in near 100% rejection of the offender by selecting the opposite side band. It's as close to a magic improvement in reception you are going to get on a radio. Again this results in a huge non-arguable difference in reception quality. The improvement in reception most radios have with sync detection is huge not small and so the improvement is not open to argument. People that argue about it are being stupid. People can write anything on Usenet or on a web page and a lot of it is crapola. -- Telamon Ventura, California |
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