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Re: Carrier to Noise Setup

1- C/N is or should be measure for 4 MHz bandwidth spacing.
2- Depending on the instrument that you measure it with, there is an adjustmen to be made for that 4 MHz bandwidth C/N.
3- Most FSM read NTSC signal bandwidth between 300 to 400 KHz, so this why you need to make a correction for that 4 MHz C/N bandwidth.
4- 43 dB C/N is easy to meet, our standard is 48 dB C/N at all customer.
5- Again depending the instrument you use, you'll usually have to make an adjustment.
6- Also you,ll usually will need an dBmV input higher than the noise figure of your mesasuring instrument.
7- Some measuring instrument do all the calculation for C/N and give you a real C/N reading, but again they will warn you to hit the unit with the proper level (dBmV).
Joe 50
This is CABL.com posting #329938. Tiny Link: cabl.co/mbxZK
Posted in reply to: Re: Carrier to Noise Setup by jmiller
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