esds:
Given the above results, what do you think are my chances of catching VHF 13 with a 5Y13S antenna.

I think you should go for the 10Y13S (If it can fit in your attic, mine is in the attic), from your location you have less signal than from my location. For about 15$ more I think you should go for the 10Y13S. The 5Y13S will probably allow you to lock on ABC-DT but you will have more frequent drop.

Piko, Kro,

Thanks for the input.

From your experience, what is the best location in the attic?

I'll take you recommendation and purchase the 10Y13S antenna.

Can the 10Y13S antenna sit on the same mast as the CM4228, where should I place the 10Y13S?

Thanks.

I have samsung 4061 lcd with built in amplifier and I found out when
I put LNA(amplifier on tv ) off for channel 3.1 and it busted my signal on 3.1 for 10-15%.

When you say busted, did you mean boosted? I don't quite understand what you're saying happened when you turned off the LNA from your samsung.

edsd:
From your experience, what is the best location in the attic?

I'll take you recommendation and purchase the 10Y13S antenna.


Has high and close to the roof (Without touching it) and at leas 5 feets away from your cm42228. Try to find a spot where you won't have any 2x4 (Or has little has possible) in the view of your antenna.

sorry . boosted is right word.

I spent all day yesterday trying to relocate the antenna within my attic to see if I could get better results.
All of my attempts were fruitless, I'm still getting very very spotty signal for 3.1 and 44.1.
I then attempted to make an antenna after looking at the youtube 4-bay bowtie antenna, with no rear deflector. Although my antenna looks like a frankenstein creation, I appears to work much better than my CM-4228.

I purchased the 4228 because I had read that it was the best commercial UHF antenna on the market. Notwithstanding, it is getting inferior signal than my diy antenna.

I can only think that this has to do with overloading from channels 17 and 35, am I correct in assuming the foregoing?

Although my DIY antenna is satisfactory, I would realy like to get the CM-4228 working.

Would a filter such as UT-2700 help my situation? I checked EBAY and I didn't see anybody selling this, anybody know where I can buy one?

BTW, I am using a CM-7777 pre-amp.

Also, I verified with Google Earth and it appears that IMt. Royal is directly blocking Mt. Mansfield, could this be the reason why ch. 17 and 35 are overloading?.

I purchased the 4228 because I had read that it was the best commercial UHF antenna on the market. Notwithstanding, it is getting inferior signal than my diy antenna.I have a CM-4228 and also get spotty reception in the west island.

Would you mind posting the YouTube link to the DIY antenna video please?

It's in this thread: http://www.digitalhome.ca/forum/showthread.php?t=25677

but rather than go with a bowtie reflector have you heard about the SBGH or DBGH antennas that perform better:

http://www.digitalhome.ca/forum/showthread.php?t=81982

edsd:
I then attempted to make an antenna after looking at the youtube 4-bay bowtie antenna, with no rear deflector. Although my antenna looks like a frankenstein creation, I appears to work much better than my CM-4228.


I can only think that this has to do with overloading from channels 17 and 35, am I correct in assuming the foregoing?

Yes you are correct.

Would a filter such as UT-2700 help my situation? I checked EBAY and I didn't see anybody selling this, anybody know where I can buy one?

BTW, I am using a CM-7777 pre-amp.

It might work for you but since i bought it for $28.99 winegard more than double it's price. I would recommend you to ask Tin Lee what they can do for you. Just ask them for a notch filter for 17 and 35 of at leas 12 db (each). The other option would be to try the ge pre-amp intead of the 7777 it might be enough. And by the way the 17 is probably causing 80% of your problem so just a notch for the 17 might also be enough.

Kro,

I sent an email to Tin Lee but the price is a bit steep (20$+ more expensive than the UT-2700 from summit source and summit source includes shipping).
In any event, it might be better to get a tunable filter rather than a fixed one.
However, I read on another forum that specialized equipment is needed to properly tune the UT-2700.
How difficult was it for you to fine tune the ut-2700?

I sent an email to Tin Lee but the price is a bit steep (20$+ more expensive than the UT-2700 from summit source and summit source includes shipping).

Yes but the Tin Lee product is High Quality and it's pre-tuned, let's say that i'm 97% confident that with it you will have a perfect reception. If I would have to buy today I would go for the tin lee solution. (for 20 to 30$ it's worth it.)

How difficult was it for you to fine tune the ut-2700?

How I did it: I used my old TV in the basement hook a simple bowtie (About anything will do) the idea is to get a snowy with color picture on UHF 17. Ideally you need a very stiff non conduting screw driver since I was not able to find one I completly cover one of my screwdriver with electric tape (Even with that the screwdriver still had an effect on the Ut-2700). Then you play around with the screw until the signal is kill. There's two notch (two screw) so you do the same with the other for UHF 35. Took me about an hour to tuned it.

Thanks Kro,

I have ordered from Tin Lee, I should receive the filter sometime next week. I will post my results as soon as I receive it.

A further question, does uhf-17 and uhf-35 have any effect on a channel 13 antenna such as the 10Y13S? In other words, given that I have seperate inputs for my preamp CM7777 (UHF - VHF), how should this filter be wired to the antennas?

further question, does uhf-17 and uhf-35 have any effect on a channel 13 antenna such as the 10Y13S? In other words, given that I have seperate inputs for my preamp CM7777 (UHF - VHF), how should this filter be wired to the antennas?
Here's how to connect:
Cm-4228->Balun->RG6->Filter->Pre-Amp UHF Input

And it has no effect on your VHF input.

Since I purchased the Bandstop filter from Tin Lee (CR7 2-ch. 35/17 (20)), these are my results: http://www.digitalhome.ca/forum/showpost.php?p=743213&postcount=263

edsd:

Since you install the filter have you try to reposition the antenna?

You cm-7777 has a switch to use one input or two Input for VHF/UHF. make sure it's set for two input. (Even if you don't have a vhf antenna yet.)

No, in fact, it's still at the same location which gave me so-so results. I'll try to reposition it where I was receiving the best results.
That being said, even with 20db of attenuation, uhf channels 17 and 35 are still coming in strong (clear image).

I tried the splitter trick (placing 1 or more splitters before the pre-amp in order to reduce the db gain);
With only one splitter I get comparable results, with two splitters, I get a reduction in signal strength across the board.

I'm thinking of just going with a lower gain antenna such as the cm4221 instead of the cm4228.

or

It might try to build a SBGH antenna but... can I assume that it won't make much of a difference given that I already have an antenna which is presumably overloading?

In any event, getting the best signal possible has become something of a hobby.

very useful info edsd!
I am now pretty sure that 15 dB attenuation of uhf17 and 35 wont be enough from my location! I guess I should be looking for 30dB attenuation!

Does your box have an on/off switch for the notches?
I am also worried about the potential effect of analog Global (46). Nobody commented on that possibility so far...
Maybe I am better getting the adjustable dual notch model.

I am also worried about the potential effect of analog Global (46). Nobody commented on that possibility so far...
Maybe I am better getting the adjustable dual notch model.

global 46 is very low power; shouldn't be a problem but I chose to protect my investment by going with the adjustable notch as when they shut down analog from the 35 and 17, we may wish to attenuate another channel; something fixed notches can't do

That being said, even with 20db of attenuation, uhf channels 17 and 35 are still coming in strong (clear image).
It's normal and OK to really affect them you would need >30 db at 35 db you will have a snowy picture. That being said the 20 db is plenty enough to prevent overload of the pre-amp and i'm sure it's not overloading on UHF.

I am also worried about the potential effect of analog Global (46). Nobody commented on that possibility so far...
Maybe I am better getting the adjustable dual notch model.
46 is not a problem (I guess it could be if are a 3 feets from their attenna!) the next most powerfull is WCFE and in one year it will shut down.

The other problem you can have is with VHF.
For those having the CM-7777: The CM-7777 is also very power full on VHF (If it overload it will affect UHF) you might have to by pass the pre-amp for VHF. (anyway the pre-amp does not help that much on VHF)

Kro:

Can VHF analog overload be a problem if I don't have a pre-amp?
If so, which channels are more problematic in Montréal?