• Get involved.
    We want your input!
    Apply for Membership and join the conversations about everything related to broadcasting.

    After we receive your registration, a moderator will review it. After your registration is approved, you will be permitted to post.
    If you use a disposable or false email address, your registration will be rejected.

    After your membership is approved, please take a minute to tell us a little bit about yourself.
    https://www.radiodiscussions.com/forums/introduce-yourself.1088/

    Thanks in advance and have fun!
    RadioDiscussions Administrators

DTV Capture Ratio

R

raFessenden

A technical question: I understand that AM radio has a capture ratio (i.e., amount of signal Station A needs to override Station B, or vice versa) of 20:1, whereas in FM it's only 2:1.

What sort of capture ratio do DTV signals have? thanks... :)
 
A desired digital TV signal must be about 16 dB stronger than any noise or competing digital TV signals in order to decode.

- Trip
 
And, it doesn't hurt to have a few dB of "Margin" above that, to compensate for daily and seasonal variations of tropospheric attenuation. Also, stations may sometimes turn their power down a bit, due to transmitter problems (most DTV transmitters run two amplifiers, so an outage takes them down about 3 dB), or tower work (maybe down to 15-20% power, while people are working on the tower). 8 to 12 dB of Margin is a good number.
 
Status
This thread has been closed due to inactivity. You can create a new thread to discuss this topic.


Back
Top Bottom