RG58A/U Coax for an SDS200

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jonwienke

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The curve changes, depending on which frequency the scanner is tuned to at the moment. If the scanner is tuned to 27MHz, you see a different curve than if it's tuned to 800MHz. And neither one matches what you see when the scanner is off.
 

Ubbe

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All filters in a scanner gets connected in line with switching diodes. When the scanner are without power the diodes doesn't conduct and doesn't connect any of the filters in line between antenna connector and the receiver, it's a total isolation between antenna and receiver. That's why you should have your scanner turned off when not in use or when bad wheater are expected as no high energy spikes from a lightning strike nearby, or someone tranmitting close by, will reach the delicate electronics in the reciever.

/Ubbe
 

jonwienke

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Except that the diodes get fried if the input gets hit with too much RF or lightning, so having the scanner off merely changes what fries.
 
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