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Forum: Antennas

7-Jul-2012, 4:45 AM

Replies: 8

Sticky: Noise Threshold

Views: 54,354

Posted By GroundUrMast

Net NM Estimator Spreadsheat

Here is a simple spreadsheet that can be used to estimate Net NM. Feel free to offer feedback... there could be bugs. If so, I'll try to correct them.

If you need a coax loss calculator, try:...

Forum: Antennas

6-Jul-2012, 7:14 AM

Replies: 8

Sticky: Noise Threshold

Views: 54,354

Posted By GroundUrMast

Yet Another Design Example

Scenario 4a (Low-VHF signal, Roof Top Antenna)

Starting Noise Margin = 18 dB
Additional Low VHF Noise = -13 dB
Antenna gain = +4 dB
Cable loss = -5 dB (long section of RG6)
Receiver Noise...

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