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Cato wrote:
Greetings: I certainly appreciate everyones opinion on my question about the similarity or difference in reception of two radios of the same manufacturer and model number. It appears from the reply so far, that if one was to sit down with any two such radios, and did a side by side comparison, it should come as no surprise if there are small differences in reception sensitivity, selectivity etc., and we should just accept that fact and live with it. But in most cases, as price and quality of components go up, variations in reception between two radios of the same manufacturer and model number should become less. If any one else has any comments on this topic, I will certainly be interested in reading them. Regards, Cato Even if the radio are the same, or nearly so, another challenge is how to make the measurements accurately. If you are scanning the band to see what one picks up vs. another, unless the radios are on the same antenna, and scanning frequencies at exactly the same time there will be observed differences. This is just because any fading of any signal being revived can affect the results. In comparing radios for real world results, you will have trouble because the real world is constantly changing. If you use lab equipment to make the measurements then you have a much better chance at seeing differences in radios. At least your measurements will be more consistent. However, then you would need to relate the lab measurements to real world application. I wouldn't be overly concerned about componenet tolerances. A good designer would understand the component variations and either specify proper components or design the circuit so that it is not that sensitive to component variations. On many circuits the variations of components are not that critical. (A few are, but many are not.) So generic comments about component variation are not important. What is important is looking at those component values that really do matter. Alignment can matter significantly, especially in front end circuits. I've seen lots of performance variation in AM radios because the tracking between antenna, RF, and oscillator tuning was bad. If you look at the circuits in many modern radios, you'll find designs that also minimize the need for critical alignment. craigm |
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