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8-Mar-2017, 2:19 PM
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#1
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Junior Member
Join Date: Mar 2014
Posts: 9
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Lost channel 9.1 cfto Toronto
Cannot received 9.1 CFTO Toronto CN tower, I had a good signal for 3 years, I have all other CN channels. I am in Newcastle Ontario my setup is Winegard HD7694 antenna with a Channelmaster 7778 preamp and a Channelmaster 3412 power distribution amp with two tvs.Antenna is on roof 18 feet high, most days I can receive 34 channels with good signal, but no 9.1 CFTO
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8-Mar-2017, 3:22 PM
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#2
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Antennas Direct Tech Supp
Join Date: Jan 2010
Posts: 2,942
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Post your exact location TVFool plot (link, please, not an image) so that we can estimate your signal environment. Also, run your FMFool plot and post an image (has to be an image) of it.
Why do you have two amplifiers installed? One is usually plenty for most situations, two are almost always one to many. Have you tried eliminating the second amp and checking to see if the problem is resolved?
Do you have the FM trap in your preamp in or out (on or off)? You have a close by FM station (94.9) that has a very strong potential to interfere into VHF channel 9 (2nd harmonic).
Loss of a single VHF station that was previously well-received is almost always due to localized electrical interference. See the attached tip sheet that I often send to customers, it can provide some insight.
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8-Mar-2017, 3:35 PM
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#3
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Junior Member
Join Date: Mar 2014
Posts: 9
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Without a distribution amp I lose about half of channels, I have tried using a Channel Master 7777 pre amp and only received 2 channels, with 7778 12 channels, 7778 along with 3412 distribution amp about 36 channels
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10-Mar-2017, 7:22 PM
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#4
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Senior Member
Join Date: Dec 2009
Location: Delmar, NY
Posts: 1,236
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I see two problems.
First, the problem with CFTO is caused by FM overload. The strongest FM station is on 94.9 MHz, which causes s spurious signal in channel 9 when preamp(s) are used. The solution is an FM trap between the antenna and 7778 preamp. The Antennas Direct FM filter is a good choice if they are still available.
The second problem is that unless your leadin is longer than 100' you should not need both a distribution amplifier and a preamp. Receiving more channels with the distribution amp in place is an indication of a bad splitter or excess loss in your coax.
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10-Mar-2017, 11:51 PM
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#5
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Antennas Direct Tech Supp
Join Date: Jan 2010
Posts: 2,942
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The use of the second amp is compensating for an undiagnosed and uncorrected fault somewhere else.
Last edited by ADTech; 11-Mar-2017 at 12:09 AM.
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11-Mar-2017, 1:42 AM
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#6
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Moderator
Join Date: Oct 2010
Location: Greater Seattle Area
Posts: 4,773
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Ditto Tower Guy and ADTech...
__________________
If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
(Please direct account activation inquiries to 'admin')
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11-Mar-2017, 2:32 AM
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#7
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Retired A/V Tech
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,753
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We still haven't seen your tvfool report, so it is difficult to give you accurate advice. The report you gave in a previous thread in 2014 is no longer available on the server.
CFTO channel 9.1
http://forum.tvfool.com/showthread.php?t=14411
Quote:
Originally Posted by nickster
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Last edited by rabbit73; 11-Mar-2017 at 2:37 AM.
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11-Mar-2017, 1:24 PM
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#8
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Junior Member
Join Date: Mar 2014
Posts: 9
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Thank you for the info, I will post a report then will look for a FM filter
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