Hepburn's New Automated DTV Log System in Grimsby, ON - Canadian TV, Computing and Home Theatre Forums

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post #1 of 22 (permalink) Old 2011-08-26, 05:36 PM Thread Starter
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Hepburn's New Automated DTV Log System in Grimsby, ON

This is really cool, William R. Hepburn, the same guy who brings us the Tropo DX forecasts, now has a new automated DTV logging system. He’s got a 70 foot tower in Grimsby, Ontario equipped with what looks like a Channel Master 3671 and a UHF Yagi that’s vertically polarized.

This is what he says about his setup;

Equipment...

Tuner... Hauppauge Aero-m
Control Software... TS Reader + Hepburn perl scripts + Windows Task Scheduler
Antenna... modified* CM-3671 @ 70' AGL 209' HAAT

I’ve been watching this site the past few days and noticed it log stations that just went digital … take a look it’s an amazing setup!

http://dxinfocentre.com/logs/dxtv.htm

http://www.dxinfocentre.com/etc/antenna-VU.jpg
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post #2 of 22 (permalink) Old 2011-08-26, 07:08 PM
 
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Quote:
Originally Posted by HDTV101 View Post
He’s got a 70 foot tower in Grimsby, Ontario equipped with what looks like a Channel Master 3671 and a UHF Yagi that’s vertically polarized.
WOW! I had no idea he was from Grimsby.
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post #3 of 22 (permalink) Old 2011-08-26, 08:28 PM
 
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70 foot tower? I'm so jealous!


The CM3671 is a great antenna- it's what I use.
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post #4 of 22 (permalink) Old 2011-08-27, 04:27 AM Thread Starter
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If you keep that page open it'll update live as soon as it finds a new digital station...

Less then an hour ago... it logged this one...

2011-08-27 0234 7 7.1 CIII-HD ON MIDLAND
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post #5 of 22 (permalink) Old 2011-08-27, 10:52 AM
 
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I have antenna envy.
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post #6 of 22 (permalink) Old 2011-08-27, 11:10 AM
 
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I actually bought the CM-3679 25 years ago from Radio Shack in my pre-satellite days along with the rotator. Unfortunately the rotator won't rotate any more (probably a seized motor).
Fortunately it seized pointing north to Camp Fortune north of Ottawa where most of the transmitters are located.
Unfortunately, because I can't rotate it south, I can't pick up any of the US stations.
Maybe someday I'll replace the rotator.
It's a great antenna that gives a great picture.
Sure glad I left it up there (30-foot tower) when I went Bell ExpressVu in '99.
(I actually left it up there for the FM signals).
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post #7 of 22 (permalink) Old 2011-08-28, 01:45 AM
 
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WOW.....What a rig!!!!

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post #8 of 22 (permalink) Old 2011-08-28, 02:21 AM
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This automated DTV DX Log provides an excellent record regular locals stations and interesting record of recent tropo events.

3D SSH III with ZZ4 refl. http://imageshack.us/user/jmsdigital
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post #9 of 22 (permalink) Old 2011-08-28, 05:43 PM
 
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Where is his tower located? It might be worth checking out on my next walk
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post #10 of 22 (permalink) Old 2011-08-28, 09:16 PM
 
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Are you sure that it's a UHF Yagi that is vertical? Looks like a VHF. Can anyone enlighten me? I'm assuming that the VHF, or UHF yagi is for signals that are over 150 miles away. Don't signals change polarity once they are about 150 miles away? Need more info on this, because I'm thinking of trying to play "this game".

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post #11 of 22 (permalink) Old 2011-08-28, 10:20 PM Thread Starter
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Yes Prince you're absolutely correct... it's not just UHF... it's a wide bandwidth Log-Periodic UHF/VHF 50~1300 MHz antenna. And yes it's vertical to catch signals that have gone past 150 miles.

This is it here,
http://www.grove-ent.com/ANT16.html
http://www.grove-ent.com/media/crant.jpg

Last edited by stampeder; 2011-08-28 at 10:44 PM. Reason: image too large - can be seen via the URL link
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post #12 of 22 (permalink) Old 2011-08-29, 02:25 AM
 
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Wink

Just wondering about that vertical antenna. Could any yagi be modified to do the same job? I was wondering if one of those hybrids that do VHF High/UHF would do a similar job, if mounted vertically. Going to have to sell my house and move out to Prince Edward County, so I can play this interesting DXing game.

Winegard PR8800, YA1713, Zenith7777 Preamp, 42" Aquos 120hz, Samsung UP5000 Blu Ray/HDDVD, C/Ku Band, Directv H21, 22.
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post #13 of 22 (permalink) Old 2011-08-29, 08:50 AM
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Theoretically, a polarization "mismatch" can affect a received signal by upwards of 20 dB. In practice it's not that much but you will notice a difference if you're trying to receive a horizontally polarized signal with a vertically polarized antenna.
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post #14 of 22 (permalink) Old 2011-08-30, 12:21 AM
 
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Quote:
Originally Posted by mr weather View Post
Theoretically, a polarization "mismatch" can affect a received signal by upwards of 20 dB. In practice it's not that much but you will notice a difference if you're trying to receive a horizontally polarized signal with a vertically polarized antenna.
Trying to nail down some of the long range Tropo. I often get some decent stuff, that is over 200 miles away and wondered if changing polarity might enhance it. Seems like the UHF works fine, for signals over 200 miles but nothing much on VHF high. Going vertical might make it feasable. I would run it with a dedicated line and it's own CM7777 and use an A - B switch to change it back and forth.

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post #15 of 22 (permalink) Old 2011-08-30, 02:45 AM
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The Hepburn Automated DTV Log System address has been changed:
http://dxinfocentre.com/hepburn/logs/dxtv.htm

3D SSH III with ZZ4 refl. http://imageshack.us/user/jmsdigital
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