If you're trying to receive channel 13, make sure the FM Trap is activated on any preamp. Channel 13 can be easily overloaded by the amplified second harmonics of any local FM stations in the 105 to 108 MHz range.

If you're trying to receive channel 13, make sure the FM Trap is activated on any preamp. Channel 13 can be easily overloaded by the amplified second harmonics of any local FM stations in the 105 to 108 MHz range.

I tried the FM trap on the CM7777 at my location ( Beloeil ) and I saw no change at all. I going to try a VHF only amp from Winegard that has a better FM trap ( that what I read ) next week on the 10y13s to see if it's better.

I am now able to get 22.1 ABC WVNY

I swapped sides for both antennas, the 91XG on top and the YA1713 at the bottom, and left a much bigger gap between them to avoid overlapping signal.

I redid all my wirering with some new RG6 quad shield satellite cabling with some compression connectors just like professional installation. I also made sure that all my antennas had the same lenght of cabling before getting merged.

I set the FM trap of my CM7777 preamp to "OUT". I also noticed that inside the preamp the switch for VHF/UHF was set to "COMBINE". That was the biggest error in my original setup, I felt like a real noob :( So I flipped it to "SEPARATE" so that both inputs were now working independently.

After that, I rescanned all channels and ABC was showing 4/5 and all the rest US stations where at 5/5 signal strenght. I noticed that a few Montreal local stations had a very poor signal. I had a spare balaun so I decided to build myself a vertical DB8 bow tie antenna with a reflector and install it in my attic. It's all made with junk wood and some copper electric wires from my garage. I plugged it in a 25dB Off-air/CATV Distribution Amplifier. Once it was properly alligned, I was getting 5/5 on all Montreal digital stations including analog stations. Global is fine but TVA and CTV are very ugly, since they are on the VHF band. I will upgrade the bow tie antenna with some rabbit ears from the dollard store. I'll post some pictures soon.

Thanks for all the good advise. :)

Excellent news, and good work too!

Hi guys,

I know this has been discussed many times, but I'm at wits end in trying to find a solution with ABC 22.1 with guy the high tower based uni-directional attenna solution.

I live in south shore (Chateauguay), which give me 45 degree position of Mt. Mansfield & Mt Royal

I have a 8 bay multidirectional antenna with a CM-7777 pre-amp, approx 25ft above ground, which gives me almost 100% signal across the board with the exception of ABC 22.1

I've tried pointing the 8 bays at Mt. Mansfield and only 1 signal bar, sometimes 2 bars. I even purchased a Clear Astream C5 High Gain VHF antenna plugged into my CM-7777 (setting changed in pre-amp to split UHF & VHF) and it had absolutely no effect.

NM db from tvfool, shows ABC at 24.9db which is much better than 17.1 at 19.6db which I receive at 100%

I understand that CFCF (VHF 12) is the culprite as an over powering adjacent channel. Is there a proven solution in using a signal trap (on VHF 12) to filter out the signal and allow for the weaker VHF 13 (ABC 22.1) to be seen?

If not, should we expect the CFCF DTV transition to allow for the ABC signal to come in?

Hi Marty34, how high from ground level is your YA1713?

Also to anyone out there, would a ch12 trap work in blocking the CFCF signal and allow the ch13 (ABC) signal to come in?

As mentioned previously, there's more to WVNY reception problems than adjacent-channel interference from CFCF 12. You've got to factor in co-channel interference from CJOH Ottawa and CKTM Trois-Rivières (both also on Channel 13).

On top of what downbeat said, there is also general VHF interference to contend with for this channel. I know that replacing my converter box with a DVD Recorder actually allowed me to receive this bloody channel for the first time at my cottage, and I suspect that my converter box interfered itself with the channel. This mostly because it made a buzzing sound when off. I also know that everything else interferes with this channel: my laptop under heavy load, my boat motor (and only a 1976 7.5HP at that), vacuum cleaners, turning lights on and off, electric drills....you name it. Mind you, all of these electrical things were plugged into the same circuit, but depending on the object it can still interfere even if plugged in to a different breaker (especially vacuum cleaners). And since you need strong signals to overcome interference - especially the amount present in a city like Montreal - I can see why people have so much trouble. Especially since WVNY is anything but strong.

I understand that CFCF (VHF 12) is the culprite as an over powering adjacent channel.

CFCF is one factor, but not the entire story. Co-channel interference from both CKTM in Trois-Rivières and CJOH in Ottawa is likely also likely a significant factor.

A third (and probably the most important) factor is that an 8-bay antenna isn't as good with VHF as others.

Your best starting point is to add a VHF antenna and connect it to the VHF input of your CM-7777. If you can find one, a cut channel Yagi for channel 13 would be best, otherwise a good VHF-HI antenna will be beneficial. If you are still having problems, you can then try filtering.

Hi Macoulombe know Chateauguay well, grew up there (St. Marys Road). It use to be easy to get ABC with a uhf loop sometimes!

I agree with roger a single cut channel 13 may be hard to get. Try a winegard YA-1713 and point that sucker at Mt Mansfield. Should do the job

Concerning WVNY-DT 22.1 (Rf 13), why not just wait.
Wait until next year when CFCF, and CJOH go on air in DT. This might clear up some of the problems. Tune into analog channel 13. See if you get some sort of snowy signal, either from CJOH-TV or overlap from CFCF-TV. If you do, then you can see part of your problem. In a year from now we'll have a better picture of what is going on.

roger1818,


what kind of filtering do you allude to re. #13...thanks

what kind of filtering do you allude to re. #13...thanks

Either a notch filter, to filter out channel 12 or a single channel pass filter to only pass 13. For the latter, you could use a jointena backwards and terminate the broadband "input." Either way this will not help with co-channel interference at all and only marginally help with adjacent channel interference.

As Blackburst said, things might fix themselves in a years time, so it might not be worth the investment.

The Clear stream C5 VHF antenna should have worked for 13. Other then the filter suggestions did you try switching the FM trap on the 7777?

I've tried pointing the 8 bays at Mt. Mansfield and only 1 signal bar, sometimes 2 bars.

NM db from tvfool, shows ABC at 24.9db which is much better than 17.1 at 19.6db which I receive at 100%

I understand that CFCF (VHF 12) is the culprite as an over powering adjacent channel. Is there a proven solution in using a signal trap (on VHF 12) to filter out the signal and allow for the weaker VHF 13 (ABC 22.1) to be seen?


This is beside your question, but I have CFCF at 49.7 dB at 82 degrees and ABC at 10.2 dB at 132 degrees. (see : http://www.tvfool.com/?option=com_wrapper&Itemid=29&q=id%3d9c6b4c74416ac9). With the SBGH10 with the NAROD (old version) I can now get ABC about 50% of the time. Against me there is: A) I don't have the latest-and-greatest-NAROD-with-3-reflector-version, B) I'm in the attic, C) I don't use a pre-amp (however I tried with one for an experiment and I got better result). I might be wrong, but from what I remember reading, you can get a better VHF-hi gain from a GH than a bowtie. (Then again, I might be mixing up the following thread: http://www.digitalhome.ca/forum/showpost.php?p=835038&postcount=1) I can keep you updated on the result I get...

jf

@macoulombe


The YA1713 is about 20 feet and the 91XG is about 30 feet from ground level.

Here is my setup with the new configuration. Ill take some pictures of my bow tie DIY DB8 antenna in the attic once I get a chance to get back there.

http://img825.imageshack.us/img825/4696/img1240e.jpg (http://img825.imageshack.us/i/img1240e.jpg/)

The Clear stream C5 VHF antenna should have worked for 13. Other then the filter suggestions did you try switching the FM trap on the 7777?
Hi Backpackster, I've played with the pre-amp switches but just to make sure I have it right, should the FM Trap be On or Off & the VHF input combined or split, when using the C5? I've also just ordered the YAGI VHF Y10-7-13 from thesource.ca which should do it according to everyone in this thread. But I'll give it a go one more time with the C5 one more time...

Your C5 should be connected to the "VHF Separate Input" and your Bowtie UHF to the "UHF combined Input" and your switch set to SPLIT.

In my case a FM trap solved my issues. I would think that that setting the trap to in (on) may help you. However this antenna game can do crazy things and it is also possible that setting it out could solve the issue also. In other words trying both is the way to go.

I think the gain of the antenna craft Y10-7-13 is very comparable but slightly less than the winegard ya1713, but a couple of dbs more than the C5. The Y10-7-13 is much more directional than the C5 this also may help solve your issue. I am also going to try a single or stacked pair of ya1713s before winter arrives.

Stampeder's mirror of the Industry Canada broadcast database (http://www.user.dccnet.com/jonleblanc/Canada_TV_Stations/DT.html) now contains a new DTV entry for Global Sherbrooke, which is listed as having been approved by the CRTC.

Sherbrooke; Channel 11; CKMI-DT-2; 611.7 metres; 1,000 watts