yes the coaxial feed for cable service does transmit on certain frequencies.
It must do that in order for your tv to receive the channels.  Your tv is
essentially a multi-band receiver with individual channels pre-programmed
into it.  So when you hook up a regular coaxial cable feed to it, the cable
must deliver signals on the frequencies your tv is programmed to receive.
With modern digital cable and IP-bassed tv, this is all moot because the
digital information is delivered to the cable box, and then the vidio and
audio signals are decoded from that, and reencoded to be sent into your tv's
vidio input as opposed to its RF input.
I'm not sure about the frequency ranges for commercial TV satellite feeds,
but i'm sure you can locate that by doing a google search for it.
It's up quite high, in the low gigs somewhere, at least for the downlinks
and regular consumer television feeds anyway.
I'm thinking in the 1.6GHZ to 3GHZ range...beyond that, i can't get more
specific.

73
Colin, V A6BKX
----- Original Message ----- 
From: "Bill Deatherage" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, June 20, 2008 6:32 AM
Subject: Re: some thing interesting


>
> Hi, one thing I was thinking is even though Cable is carriede by wire does
> it still transmit on a certain frequency.  also, I would like to know what
> frequency the satellites like direct TV and the dish net work are
> transmitted on?
> I think that would be interesting.
> Bill
>
>
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