[Elecraft] Intermod or mixing?

[Jim Brown]

On Sun, 13 Jun 2010 11:21:49 -0400, Joe Subich, W4TV wrote:

The info below is only partially correct. WBBM-TV has a CP 
(construction permit) to move to Channel 12. WKYC-TV has a CP to 
move to Channel 17. Both chose to move to avoid impulse noise that 
is present on the low-band VHF channels, and causes break-up of the 
digital signal. Another factor in WBBM-TV's move was problems with 
close-in high rise buildings. WTVF has a CP for channel 50. WEDY is 
the only one of those cited who appears to be happy with their low-
band VHF assignment. Tom is right -- low band VHF is now used by 
only a handful of broadcasters in the US. 

For REAL FCC data, see  

http://www.fcc.gov/fcc-bin/audio/tvq.html

and 

http://www.fcc.gov/dtv/markets/

73, Jim K9YC

> > The low-band TV signals are all QRT now,

>There are more than four dozen full power DTV licenses (including
>WMAZ-DT on channel 4 in your back yard) and quite a few low power
>DTV stations.  The biggest cities with licensed "full power" low
>VHF DTV are Cleveland OH (WKYC, channel 2),  Chicago IL (WBBM,
>channel 3), Nashville TN (WTVF, channel 5), and New Haven CT (WEDY,
>channel 6). There are construction permits or special temporary
>authorizations for a couple other large/middle market stations as
>well.