My mother lives near Cornwall, Ontario. The only digital channels she can receive at present are CBOT 4.1 (RF 25), WNPI 18.1 etc (RF 23) and WCFE 57.1 etc (RF 38). CBOFT 9.1 (RF 22) occasionally comes in. Her antenna system needs upgrading and we are considering a CM 4228HD antenna with a CM 7777 preamp. We would like to be able to get WPTZ 5.1 etc (RF 14) and WCAX 3.1 etc (RF 22) but are concerned with co-channel interference on RF 22 from digital CBOFT and RF14 from Analog CJMT. From TV Fool, digital CBOFT on RF 22 has an NM of 4.8 versus an NM of 5.7 for WCAX-DT on the same frequency and CJMT on RF 14 has an NM of 9.6 versus a NM of 5.7 for WPTZ on the same frequency. Aiming the antenna toward the WPTZ and WCAX transmitters on Mt Mansfield would put CBOFT almost exactly 180 degrees to the back side and CJMT would be a little off to the side on the back. Based on these NM values and considering the potential for co-channel interference at our location, is it likely that the directional nature of the CM 4228HD and its associated high front to back ratio, would allow us to receive WPTZ and WCAX?

Based on these NM values and considering the potential for co-channel interference at our location, is it likely that the directional nature of the CM 4228HD and its associated high front to back ratio, would allow us to receive WPTZ and WCAX?

You'll probably be OK for WCAX, but you may have some issues with WPTZ.
AFAIK, TVFool's NM values are about -80 dBm for analog and -90 dBm for digital. For WCAX/CBOFT, they're both digital, and the NM are almost the same, so you just need to make sure you have at least 15dB (preferably 20-25) front-to-back ratio on the antenna.

For WPTZ/CJMT, CJMT (the undesired analog signal) is already about 15 dB stronger than WPTZ, so you'll need at least 30 (preferably 35-40) dB difference in gain values for the two stations. The old 4228 had 25-30 dB F/B ratio; I don't know how the new one does.

You may be able to improve things slightly by tilting the antenna up a few degrees towards Mt Mansfield. This will reduce the gain towards line-of-site Herberts Corners, and increase the reception of refracted signals from Mt Mansfield, perhaps. Also, playing around with the exact horizontal angle may place Herberts Corners in a deeper null, as there are probably numerous lobes on the backside of the antenna, but one only one large forward facing lobe.

One thing to watch out for is that TVFool does not (yet) take Canadian antenna patterns into account, so if you are not at the maximum part of the Ottawa signals, TVFool may be overstating their Noise Margins. I know that CBOT and CBOFT are both directional, although most of that directionality is from being on a side-mounted antenna facing south. I don't recall if CJMT is directional or not. The good news is that I think channel 14 disappears from Herberts Corners in 2011.

BALM: I am not splitting my signal, it's antenna, into PCT amp into TV.

Is anyone in the West Island, Hudson/Rigaud, or Cornwall areas getting OMNI2 on channel 66 from Ottawa?
Both OMNIs started digital broadcasting today from Herberts Corners, but OMNI1 is on 27, so closer to Montreal it would likely be blocked by interference from CIVM TeleQuebec.

Herberts Corners? (Manotick) seems far to catch :)

Maybe if you lived in Hawkesbury, ON. Riguad QC is 112KM so that would possible depending how many KW they are pumping out. From Kirkland it's 145KM!!! Not likely :)

Its a fair question he's asking since we don't know for sure what might be occurring, and this thread covers the area he's interested in. I agree that Kirkland would be almost a miracle! :)

I am in Roxboro and have CBC and SRC locked with a 91XG, 7777 and a rotor on the roof.

Does anyone know how high an antenna someone would need to capture CBC from Baie D'urfe (on Lakeshore near Morgan). Has anyone succeeded from around there?

My friend has a setup there that easily captures Mount Mansfield including ABC with an old outdoor setup. When I google Earth it, it looks like Mount Royal blocks the LOS to the Radcan building. However, I was under the impression that the UHF signals should bend down over the hill. I was just wondering if they had any chance of picking it up (now at least, when it moves, it will be fine). Thanks

Are they right down by the water in Baie D'urfe or further north?

Try the steps in Post #10 of the OTA FAQ to get their local info.

cheap guy,

as many have said, you CANNOT get CBMT, SRC, and probably CFJP from Dorval to the west of the island (that includes, Pointe-Claire, St-Annes (south), Kirkland, Baie-Durfe, Beaconsfield).


We are too much inside the shadow of mt-royal....


BUT if you do get it, PLEASE, let us know!

I managed to get WVNY last night by installing a winegard 10Y7-13, my samsung reciever reporting 5 out of 10 bars and my EZ48K reporting 83%. I will tweek it today.

upchuck247 Don't you mean a Wade 10Y7-13?

I stand corrected, the box says Winegard YA-1713, the receipt from Raybel has 10y7-13 in the description.

CBC reception report from DDO near Blvd des Sources and Roger Pilon

Recently built jed GH6 is locking on CBC French 19.1 (CBFT) but not CBC English 20.1 (CBMT). Strange, because I thought the transmit power would be equal and the antenna locations would be the same (Radio Canada building).

An SBGH with a ¼” x ¼” reflector made from steel fencing material (recently upgraded from aluminum foil) can’t pick up either CBC French or English but is doing a super job pulling in all the US border stations with an estimated 30% improvement over the aluminum foil. The GH6 for some unknown reason isn’t doing as well on the US stations.

Both antennas are currently indoors on the second floor

sparky mtl

From what I remember, the SRC transmitter is located directly above the CBC one.

because I thought the transmit power would be equal and the antenna locations would be the same (Radio Canada building).


No, CBC is at a third of the power of SRC.
TO means temporary operating authority.

QC MontrÓal TO 19 CBFT-DT(1) CBCE 453105 733302 111.4 16600 500.00

QC MontrÓal TO 20 CBMT-DT(1) CBCE 453105 733302 103.7 5500 506.00

cheap_guy,tvlurker,
Thanks for the info. That explains it. SRC was just making it so it's not a surprise that CBC is harder to catch with 1/3 the power.

is anyone in the west island using a reflectorless UHF antenna to catch US and Montreal stations without rotating...

Balm,

I bought the RCA CANT711 for about $80 a few months ago, and it has been great (I saw it at the Source for 60 recently). Considering my location (near Fairview), I am able to get most of the channels everyone else gets (CBS, NBC, PBS (33), ABC, TeleQuebec, Fox(not any more, though)). The antenna sits on a 4-foot podium in my garage, pointing towards Mount Mansfield. I have had no luck with CBC or SRC, but most people in my area seem to be in the same boat.

I didn't have the time to devote to building my own antenna or getting one installed on the roof, so this was the perfect solution for a rookie like me.

maveman,

that's a very neat, slick machine....thanks for the heads-up!

you say it's in your garage, that is INDOORS! what would happen if you put it outside or can it be put outside....

why have you lost Fox...

you get ABC, so its a vhf/uhf antenna...

also, can you give an indication of the signal strengths your getting...

and what about TQS (#42), and PBS (#38)...