Post A Reply
my profile
|
directory
login
|
search
|
faq
|
forum home
»
Flare Sci-Fi Forums
»
Star Trek
»
Starships & Technology
»
DS9 Rising
» Post A Reply
Post A Reply
Login Name:
Password:
Message:
HTML is enabled.
UBB Code™ is enabled.
[QUOTE]Originally posted by machf: [QB] [QUOTE]Originally posted by Peregrinus: [qb] Actually, Aban, you can just plug it in and get up to twelve (depending on how many you have in your broadcast area) -- up quite a bit more if you hook up a UHF antenna, too. [/qb][/QUOTE]You [b]can't[/b] get "up to twelve", since per technical specifications, there has to be a one-channel (6MHz) separation between stations in VHF to avoid them interfering each other. Here in Lima we have the maximum possible: 2, 4, 5, 7, 9, 11 and 13 in VHF. That's 7 channels in total. 4 and 5 can both operate simultaneously because there's actually a 4MHz gap between them assigned to police/military communications IIRC. In UHF, the required gap was 5 channels (30MHz), so we used to have channels 15, 27, 33, 45 and 51 some years ago, though lately it seems they've relaxed a bit as there have appeared, for example, channels 19 and 21, with just a 6MHz gap between them like in VHF. Well, back then when it was up to channel 83 (and not 69 like nowadays that the upper end of the UHF spectrum has been reassigned to cellulars, argh) the 30MHz gap would have meant a maximum of 12 channels: 15, 21, 27, 33, 39, 45, 51, 57, 63, 69, 75 and 81 in our case. The reduction to 69 as the uppermost channel reduced the maximum to just 10. The reduction of the gap to 6MHz would give a theoretical maximum of 28 channels (squeezing another 2 between each 2 of the former 10 maximum). Of course, all this is just for M systems, as the frequency assignments and channel bandwidth are different depending on the TV system used... (NTSC, PAL, SECAM = [b]norm[/b], specifies how color information is encoded into the TV signal; A, B, G, I, N, M, etc. = [b]system[/b], everything else, as defined before color TV existed) [/QB][/QUOTE]
Instant Graemlins
Instant UBB Code™
What is UBB Code™?
Options
Disable Graemlins in this post.
*** Click here to review this topic. ***
© 1999-2024 Charles Capps
Powered by UBB.classic™ 6.7.3