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Receiver protection: a game-changer

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KRagh
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re: Receiver protection: a game-changer
KRagh   4/27/2012 5:51:32 PM
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While this is a wonderful history, the practical application today stems from TDD systems such as WiFi in various bands. Since Tx and Rx are on the very same band, often protection is offered in terms of protocols such as CTS but the receiver itself operates only using higher signal levels (about +26dBm Tx and -85dBm Rx on the worst case). Higher the signal level of Rx, higher modulations can be used. Although this article mentions it in passing, the FDD method (Tx and Rx on separate frequency bands - and 45 MHz is typical) offers a better solution and opted by most wireless service providers today.

Les_Slater
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CEO
re: Receiver protection: a game-changer
Les_Slater   4/25/2012 1:03:07 PM
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The magnetron was indeed a game changer. Where would we be without the microwave oven? Receiver protection is very important though. I designed ultasound front ends and got a good appreciation for that.

an_m
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re: Receiver protection: a game-changer
an_m   4/25/2012 7:20:07 AM
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Umm. At the start of World war II ( 1939 to us ) the British, and the Germans had working single dish radar systems. With 'quite good' receiver protection, might not have been as the MIT team did, who undoubtedly patented the invention, but I do think that compared to say the magnetron, which made small powerful CM radars possible, the TR switch was not that big a step change. gripe over

Doug21201
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re: Receiver protection: a game-changer
Doug21201   4/24/2012 4:24:53 PM
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UPDATE: I was talking about this entry with a friend the other day and he informed me I got the quote wrong - and the actual story is even more colorful. The success in using a single antenna was communicated to England over a commercial shortwave broadcast as "Today we saw Mary Baker Eddy with one eye". This meant they had produced a radar image of the dome of the Christian Science church (founded by Ms. Eddy) across the river in Boston.

JanineLove
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Blogger
re: Receiver protection: a game-changer
JanineLove   4/24/2012 2:53:39 PM
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Thanks for this great post Doug. As a history buff, I really appreciate this kind of perspective.

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