(meteorobs) ATSC Pilot carriers for forward scatter???

[Raydel Abreu (CM2ESP)]

Hi Paul,

Thanks for the info. According to ATSC Digital Television Standard – Part 2:
RF/Transmission System Characteristics

(Found here: http://www.atsc.org/cms/standards/a53/a_53-Part-2-2011.pdf)

The pilot carrier is 11.3 dB below the signal power. Let's say 12dB. A very
brute conversion and calculus I made: A 30kW transmitter would produce an
equivalent 1.5kW carrier.

As right now I am monitoring less than 1kW local and regional analogue TV
transmitters we use in Cuba at 187.250 MHz. There may be a chance of
picking some of the very very powerfully transmitters at Florida in lower
frequencies more efficient for meteor scatter.

>From the FCC database, power data is ERP (Effective Radiated Power):

- 32kW   (http://transition.fcc.gov/fcc-bin/tvq?list=0&facid=64592)
- 67kW   (http://transition.fcc.gov/fcc-bin/tvq?list=0&facid=73136)
- 158kW (http://transition.fcc.gov/fcc-bin/tvq?list=0&facid=63840)

Those previous are all in channel 7, 174.31 MHz which is clean in Havana
(used analogue Ch. 8), but frequency could be quite higher, however, that
158kW transmitter is very promising!!!

There is also a low frequency one in Ch.3 60.31MHz:
- http://transition.fcc.gov/fcc-bin/tvq?list=0&facid=72053
Unfortunately the current licensed is only 1kW, but there is also a
construction permit for same location and frequency for a 45kW. So in the
future there may be a chance!!!

I will try those Ch. 7 transmitters during weekend!!!

All the best,

Raydel, CM2ESP
Havana, Cuba.


2013/9/3 Paul Goelz <pgoelz at comcast.net>

> At 03:37 PM 9/3/2013, you wrote:
> >This topic has been discussed early, but I'm looking for users
> >experiences. Has someone already tested for meteor forward scatter
> >using ATSC Pilot Carriers at decimal (XX.310). How are the results
> >does it worth to build an antenna?
>
> Yes, I have occasionally heard meteors on a couple of the low band
> (2-6) ATSC frequencies.  However, at least around here, there aren't
> many low band ATSC stations at the right distance so results depend
> on propagation much more than they do on NTSC channel 2.  Also, I
> think the pilot carriers are relatively lower power than the NTSC
> video carriers were, so the meteor returns are fewer and weaker.
>
> Note that this is all using a non-directional 50MHz horizontal loop,
> which is of course not ideal for TV channels.  I use what I got.....
>
> Paul
>
>
> Paul Goelz
> Rochester Hills, MI USA
> pgoelz at comcast.net
> www.pgoelz.com
>
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