Does anyone out there with a cm7777 have a feel for what the crossover
curve is like between the two inputs in the separated mode?

situation:
I have a VHF/UHF similar to the CM-3671.
further up the mast, there is an old reflector yagi (arrow).
I'm going to be replacing the yagi with something newer... 4228 I'm thinking.
both fed into an old preamp vhf/uhf inputs. (to be replaced as well)

now, it didn't matter much using analog, but with the digital... the phasing
is off just slightly between the two antenna making it nearly impossible
for digital reception...
the old preamp seems to spill to much of the uhf signal from the combination
antenna causing a conflict with the yagi. The driven element on the uhf portion
of the combination is approx 5 feet ahead of the mast, and the driven element
of the uhf yagi is approx 2 feet behind the mast creating a slight delay.
there was always a hair of ghosting on the analog picture. Was never much
of a concern until now with most of the channels watched are from over
the border....

I'm hoping the band pass filtering of the 7777's vhf input cuts off steeply at
about 300mHz and the same for the uhf filter's bottom end starting to rise
at about 400mHz. (as a cm4228 is capable of grabbing some vhf hi band signals, this would cause a conflict there to in the future.)

Seems that channel master doesn't seem interested in putting much information
out there anymore.

Sorry OTAHD Addict: I wish I could help you with your situation, but I DID figure out how to get my CM4228 to pull in Toronto, Hamilton AND Buffalo without the use of a rotor:

I removed the reflector, or the back part that looks like a BBQ grille, and put it back up on my tower (35 ft in the air) with the front facing Buffalo. With a little fine tuning I'm getting EVERYTHING on Daniel's guide except CKXT 15 Hamilton and CITY 57 Toronto.

I'm in south St. Catharines, near the canal and GM (I can actually see GM when I'm up that high) so if anyone out there is looking for something inexpensive that works, I would recommend the CM4228. You could probably get an 8 bay without the reflector on it, but this was trial and error, and it worked.

Can you simply remove the UHF components on the VHF/UHF antenna? I bet you can. Generally the UHF sits out front and is connected electrically at two points. I'm thinking hacksaw here.

Donny, you are correct that the UHF is at the front end of the antenna...
unfortunately, the high band of the VHF antenna overlaps slightly into
the UHF. Plus, the balun is mounted to the UHF element.

This would have been a lot easier 15 years ago when we had a 30 year
old vertically stacked VHF only separate from the UHF. But it didn't
survive one winter. lost a few to many reflectors/directors.
Not to many VHF only antenna out there on the retail market these days,
at a reasonable price, I found at the time.

I just want to make sure that one of the pre-amps does what i want it to
do before i purchase it.

(by the way, this set up is on Lake Huron, and will be used for Detroit
and Flint locals, and any Kitchener/London/Woodstock area stations.)

Waiting to see if Channel master answers my email.

I betcha this isn't a problem. You should be able to re-locate the balun to the VHF element(s) of the antenna and discard the UHF components.


I bought a VHF-hi only antenna last year and it wasn't expensive. My thoughts are the VHF-lo band is being vacated anyway so no point worrying about it.

it's vhf hi that's in the way of the uhf. vhf lo is the big end of the antenna, and yes, it's pretty much going down.



over all, it doesn't matter if channel master is correct.
they claim that there are band pass filters in place!

yes yes yes...

Agreed. I have the Winegard myself. The glowing testimonials for each are confidence inspiring enough. :) To get anything better you'll be well into the 150$ range.

NBC Universal Sports will be replacing the weather on 2-2 on June 1.

Finally a Sports station, too bad it only 480i !

Ah! Shit!!

Couldn't put it on 2-3, could they?

Isn't that where RTN is supposed to go?

You would think WIVB would have a weather-sub channel. They're always bragging they have the best meteorologists, equipment and forecasts...

I couldn't agree more.

I know this isn't for the buffalo area, but...
I got my cm7777 and 4228HD.
No help to change the antenna on the tower today, so I put on a 15' pole and propped up facing Detroit.
17 digital channels including the sub channels.
Pointed towards Flint and grabbed another 5.

The conditions were pretty good today though. Can't expect this all the time.

WXYZ channel 7 has a weather sub with Detroit radar just like WGRZ :)

Just how low can the 4228 go in bands? How about VHF low...
On the analog side of things,
I picked up Global from Paris on 6.
Also CKNX 8 from Wingham which is in VHF hi, as well as CFPL 10 London,and CKCO 13 Kitchener.

There is something digital on 29 also, but global has an analog transmitter on that channel to.
Its killing the digital.

Now to put the amp in separate input mode and see it ChannelMaster techs are right...

144 pages of posts about Toronto and Buffalo? How to explain that? I see why it's got a sticky -- people just keep adding to it!

I imagine this is Daniel's home town crowd. I also imagine this must be a crazy TV station area.

Is this thread so popular because there are lots of you in that area, or does Daniel advertise the site on the sides of busses? What gives?

I do know that I've got no problem compared to you guys. I'm in the Los Angeles area where the only rotor I've ever seen is on my father-in-law's house near downtown, where he has about a ten story telephone company building directly in the path of signal from the one mountain where 90% of the area's transmitters are. And I've got one customer in a canyon where UHF 28, due east, comes in when pointing due north up the canyon.

What are the basic problems there?