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Connecting RF Coaxial Cable to a DC Output

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ericz

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Hi All,

Can I connect Coaxial cable to a DC output pin (for example, RSSI output pin of a Receiver which indicates the received power accepted in the receiver and measured in voltages) in a noisy enviroment to the central pin of the cable and without connecting the grounds?

for example:

1. Receiver RSSI output pin is 1.2V
2. Connect the Center pin of the coax to the RSSI testpoint
3. Dont connect the ground of the cable to the ground of the RSSI pin

Is there a problam in this configuration? Is the sheilded cable (coax) masks the interferences? Do I need to connect the receiver ground to the coax ground?

Attached is a schema explains the mini system.

Thanks,
 

The coax shield has to be used as dc 0V reference, so it has to be connected at both ends, but, and here is a trick, use 1mH (or similar) inductor to connect the "noisy" ground to the coax shield.
Regards,
IanP
 

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