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The Official AVS Antenna and Related Hardware Topic! - Page 350

post #10471 of 16052
Quote:
Originally Posted by asg1290 View Post

I too am in a similar situation except my location doesn't have many stations. My TV Fool chart looks pretty dire and I'm not sure I'll ever be able to receive Digital OTA at my home anytime soon. I'm wondering if it would even be worth the time to find out. Any advice would be appreciated

asg1290,

I think you could get all the stations at 8.2 miles, if you use a Channel Master CM3020 antenna and make sure you point it at the horizon (skyline). You may need to add a pre-amp. Install the antenna first and order the pre-amp later. Make sure it has a very low Noise Figure (NF).

I'm at 60+ miles with 2-edge reception and signal levels much lower than yours (-100 to -124). I'm using a CM3020 that is 15 years old.
post #10472 of 16052
Quote:
Do I need to terminate the open coax connection with a 75 ohm terminator to the second tv, or is it isolated enough not to make any diff?

Yes, you should. http://www.hdtvprimer.com/ANTENNAS/g...ml#terminators
post #10473 of 16052
Quote:
Originally Posted by Davird_Jr View Post

Where can one get ONE boom section for the XG-91? Sounds like exactly what I need.

I can't seem to find info on aquiring this anywhere. Any hints?
post #10474 of 16052
Quote:
Originally Posted by Davird_Jr View Post

I can't seem to find info on aquiring this anywhere. Any hints?

Contact AD directly via their contact form on their website.
post #10475 of 16052
Quote:
Originally Posted by garskiff View Post

I only have 6' between the splitter and the pwr supply of the CM7777.

OK. Let me rephrase this.

How much cable is there between the pre-amp and the pre-amp power supply?

So far I'm totalling:

6' between antenna and pre-amp
6' between pre-amp power supply and splitter
~30' distribution run
~50' distribution run

Without a lot more cable, I'd recommend that you try replacing the CM7777 with a CM3412 two-way distribution amplifier. It has a very low NF, less likelyhood of overdriving your system, and completely isolates your two distribution legs.

If you need to get more height, move the antenna off the chimney mount and use a tower. If you ever get hit with lightning, you'll be glad you did. I've seen way too many antenna pole setups (more than 5' above roof lines) destroyed by wind. My tower is 15' above the roof line now and I'm looking to go another 20'.

NOTE: KDMD is operating their pre-transition DTV transmission on channel 32 (same channel as their LP's in Fairbanks) at .647KW. They will go full power (17.2 KW) on channel 33, when they turn off their analog transmission, which is on channel 33. How's your reception of analog ABC?
post #10476 of 16052
Quote:


Guess I could add that 5' mast extension on just to see if there is a big improvement... It would have to be pretty big to get my wife's seal of approval.

You could go to TVFool and add 5' to your height and get a feel for what it will do for you.
post #10477 of 16052
Here ya go Systems2000,

6' from antenna to mast mounted CM7777 combined input
25' from CM7777 Output/Power to the pwr supply input side
2' from the antenna out to TV to the splitter (GE 2 way 5-2300MHZ pwr pass) IN
6' from the splitter out to my Dish network 722 DVR OTA antenna in.

I installed it this way to test the amp and will not install the 50' and 30' RG6 to the
other TV's until I can verify my setup and the CM7777.

I will terminate the open drops on the splitter.
I will run a test on TVfool to see if the additional 5' will make a diff.
I'll test my Analog channels to see if the amp made a difference.

Thanks for all the help and good advice.

Gary
post #10478 of 16052
Going from 24' AGL to 29' AGL will not make any difference. You need to get above 35' AGL.

39' of cable from antenna to input of the "Dish network 722 DVR OTA antenna in," isn't very much cable. You also have a 3.5-4.0 dB loss through your splitter.
post #10479 of 16052
Quote:
Originally Posted by garskiff View Post

As a Dish Network customer On Whidbey Island, Wa, I lost access to Channel 4 (ABC) due to a contract dispute between Dish and Fisher Broadcasting. I have a 722 HD DVR with ATSC tuner so I bought and mounted a ClearStream4 Antenna and hooked it up to the Antenna In. When I re-scanned locals, it brought in 30 channels including the Dish banned channel 4. At this point I was starting to think about dumping Dish and going OTA only. Signal strengths measured between 60 and 100 on stations that are as far away as 50 miles, but splitting the signal to feed two other TV's required some amplification so I bought a CM7777 and mounted it on my mast 6' below the antenna.

Weak and strong channels across the UHF band show no improvement in strength I checked the RG6 before installation and found no opens or shorts.

I bought the CM7777 based on the many good reviews on this forum and others. I'd love to get rid of Dish Network, but need to solve this problem first. Any suggestions on where to go first with the CM7777 ?

Great Forum. Thanks in Advance for any help.

Gary

I have a CM7777 and a DISH 722.....when you put the CM7777 in line, and I take it you used a diplexer outside, did you use one that passes power on BOTH ports?? (MOST DONT! They only pass power to the DISH side)....the voltage out of the 722 (19V) is perfect for the CM7777....get a splitter (I get mine off Ebay...cheaper) that passes power to BOTH ports....and you'll be better off...DO NOT put the CM7777 in the cable line UNLESS you have separate cable feeds to your DISH and OTA antenna.....I have a splitter inside that passes power from the 722 ONLY to the main line. It goes out and then hits the DUAL splitter which feeds power to BOTH ports (dont get them backwards or you may blow up your OTA input!)...and it works just fine; even worked with my older DISH 5000....13/18V....except to get max gain, I had to put the DISH on 9999 or 000 AUX...the 722 doesnt have 000 but it DOES have 9999 if you are using a legacy switch (SW21) and LNB...if you are using DISH PRO+, you dont have the switch and any channel the 722 is on, the voltage is ~19V......if you live near FM transmitters, you may want to turn ON the FM trap in the 7777...also dont POINT the antenna where it faces a nearby STRONG LOCAL TV signal...that will cause the 7777 to compress and not ampilify correctly....a little OFF can make a BIG difference.
post #10480 of 16052
Quote:
Originally Posted by garskiff View Post

Here ya go Systems2000,

6' from antenna to mast mounted CM7777 combined input
25' from CM7777 Output/Power to the pwr supply input side
2' from the antenna out to TV to the splitter (GE 2 way 5-2300MHZ pwr pass) IN
6' from the splitter out to my Dish network 722 DVR OTA antenna in.

I installed it this way to test the amp and will not install the 50' and 30' RG6 to the
other TV's until I can verify my setup and the CM7777.

I will terminate the open drops on the splitter.
I will run a test on TVfool to see if the additional 5' will make a diff.
I'll test my Analog channels to see if the amp made a difference.

Thanks for all the help and good advice.

Gary

Dont bother terminating the open ports...wont make much difference. Get rid of the CM power supply and let the 722 do it for you..also I bet you have a problem with TWO DC voltages (the 722 and the CM PS) coming out...somehow I see that could be an issue...you dont need the CM 0747...take it out. MAKE SURE YOU HAVE POWER PASS from DISH 722 sat out to cable to splitter (BOTH ports) to DISH AND CM7777--you'll be good to go.
See crudely drawn image for my setup...it works! (Verified on analog and with R2670 spectrum analyzer)
LL
post #10481 of 16052
Quote:
Originally Posted by 300ohm View Post

Yes, you should. http://www.hdtvprimer.com/ANTENNAS/g...ml#terminators

Maybe 0.2db or so..but in practice, not enough to make a real difference....
post #10482 of 16052
Quote:
Originally Posted by ProjectSHO89 View Post

Contact AD directly via their contact form on their website.

Thanks.
post #10483 of 16052
I mounted my M8 today and gave it a test run. Very disappointed. Even with my pre-amp, it didn't receive any UHF channels other than 39 (WJAL-DT) and WWPB-DT. I could only mount it at around 30'. I'm not able to get it any higher without some major standoff blocks, lowering my DBGH, or swapping it with the CM3020.
post #10484 of 16052
Hi all,
I currently have a CM3021 (now called a 4221) with a Winegard 19db UHF only pre-amp. I have it on a rotor but I have parked the antenna in a spot where I can get Baltimore and DC locals. The Baltimore locals are at 106 degrees while the DC are 191. So this antenna has a wide range.

Well, some of my local HD's are moving to VHF HI. Can someone recommend an antenna that can give me similar results to what I have today? I want to avoid have to rotor the antenna back and forth between DC and Baltimore. After the install I want to play with the rotor to find a good compromise spot where I can get both cities and not have to touch the rotor again.

One of the reasons I want to avoid "rotoring" is because my antenna is high up to where I don't want to climb. Every so often the rotor trips it's breaker (what the antenna guy told me). The last antenna guy just climbed up and reset the internal breaker and I got charged for 1 hour labor.

Thanks
post #10485 of 16052
Quote:
Originally Posted by DinoT View Post

Hi all,
I currently have a CM3021 (now called a 4221) with a Winegard 19db UHF only pre-amp. I have it on a rotor but I have parked the antenna in a spot where I can get Baltimore and DC locals. The Baltimore locals are at 106 degrees while the DC are 191. So this antenna has a wide range.

Well, some of my local HD's are moving to VHF HI. Can someone recommend an antenna that can give me similar results to what I have today? I want to avoid have to rotor the antenna back and forth between DC and Baltimore. After the install I want to play with the rotor to find a good compromise spot where I can get both cities and not have to touch the rotor again.

One of the reasons I want to avoid "rotoring" is because my antenna is high up to where I don't want to climb. Every so often the rotor trips it's breaker (what the antenna guy told me). The last antenna guy just climbed up and reset the internal breaker and I got charged for 1 hour labor.

Thanks

If you can list the call sign & channels of the stations you are receiving now I will give you some ideas
post #10486 of 16052
Since 7 (WJLA-TV), 9 (WUSA-TV), 11 (WBAL-TV), & 13 (WJZ-TV) are currently being used by the analog transmissions, it's kind of hard to determine what will happen on June 12th.

If you supply us a post-transition digital result from http://www.TVFool.com/, we could give you a better answer.
post #10487 of 16052
Quote:
Originally Posted by systems2000 View Post

I mounted my M8 today and gave it a test run. Very disappointed.

Sounds like the same disappointment that I experienced when I compared my new 4228 with my 4221.
How did you phase together the two M4s that make up the M8?
post #10488 of 16052
14 AWG solid copper. I soldered them at the connection point and at the 300 ohm lead take-off to the pre-amp.

I think I'll be transporting it to my wife's parents house, located in Mercersburg. They're in a better receiving area and it may work better for them.
post #10489 of 16052
Quote:
Can someone recommend an antenna that can give me similar results to what I have today?

Probably your cheapest option would be to add a vhf-hi antenna with a combiner. If youre fairly close to Baltimore and Washington, you may be able to get by with a local type vhf-hi antenna, which would have a wide beamwidth.
post #10490 of 16052
Quote:
Originally Posted by DinoT View Post

Hi all,
Well, some of my local HD's are moving to VHF HI. Can someone recommend an antenna that can give me similar results to what I have today? I want to avoid have to rotor the antenna back and forth between DC and Baltimore. After the install I want to play with the rotor to find a good compromise spot where I can get both cities and not have to touch the rotor again.

As close as you are to Baltimore, you should do just fine with a Antennacraft Y-5-7-13 favoring the direction of DC. The larger version of this antenna may be too directional for your needs. The DC VHF-HI stations will be broadcasting strong signals in your direction post transition.

Do you recieve WETA-DT & WDCW-DT from DC well now? How about WMPT-DT from Annapolis?
post #10491 of 16052
Quote:
Originally Posted by systems2000 View Post

14 AWG solid copper. I soldered them at the connection point and at the 300 ohm lead take-off to the pre-amp.

I think I'll be transporting it to my wife's parents house, located in Mercersburg. They're in a better receiving area and it may work better for them.

Did you use tapered lines as per mclapp?:

http://www.digitalhome.ca/forum/show...&postcount=101

http://www.frontiernet.net/~mclapp/A...se%20lines.pdf

Did you also try phasing the two M4s using 2 baluns and splitter/combiner with equal length coax lines. I got 2.5 dB more that way with 2 4221s side-by-side (the phasing of the 2 baluns must be correct).
post #10492 of 16052
I have a country home in Dalton, Mo and I'm trying to decide what's the best antenna for me. Below you'll find my channel listing from antennaweb.org. Please let me know what I'll need to get the best reception. Thanks

* green
uhf KMOS-DT 6.1 PBS SEDALIA, MO 171° 53.7 15
* blue
uhf KMIZ-DT 17.1 ABC COLUMBIA, MO Jun 12, 2009 (post-transition) 150° 49.0 17
blue
uhf KMIZ 17 ABC COLUMBIA, MO 150° 49.0 17
blue
vhf KOMU 8 NBC COLUMBIA, MO 130° 52.6 8
violet
vhf KRCG 13 CBS JEFFERSON CITY, MO 134° 68.5 13
* violet
uhf KMIZ-DT 17.1 ABC COLUMBIA, MO 150° 49.0 22
Note:
post #10493 of 16052
was gonna pickup a terk hdtva but everywhere around here is out of stock except best buy and they want 73 bucks for it, not gonna pay 73 because i've seen it elsewhere cheaper then that. For 73 bucks you can get an outdoor antenna

talk about robbery
post #10494 of 16052
Quote:
Originally Posted by nicoge21 View Post

was gonna pickup a terk hdtva but everywhere around here is out of stock except best buy and they want 73 bucks for it, not gonna pay 73 because i've seen it elsewhere cheaper then that. For 73 bucks you can get an outdoor antenna

talk about robbery

A robbery is when someone holds a gun to your head.

It's your choice to buy it or not - it's called capitalism....so quit whinin'
post #10495 of 16052
Quote:


Below you'll find my channel listing from antennaweb.org. Please let me know what I'll need to get the best reception.

Youre better off looking at the numbers from TVFool than from a color chart. Post your TVFool png image here.
post #10496 of 16052
Quote:
Originally Posted by nicoge21 View Post

was gonna pickup a terk hdtva but everywhere around here is out of stock except best buy and they want 73 bucks for it, not gonna pay 73 because i've seen it elsewhere cheaper then that.

Amazon usually has them for about 40 bucks with free shipping. That's the best deal I've ever seen for the HDTVa.
post #10497 of 16052
d
post #10498 of 16052
t
post #10499 of 16052
Sorry about the previous 2 posts, but I had to at least have 3 posts in order to post a url. Below are my results from tvfool.com. Please let me know what I should do.
http://www.tvfool.com/?option=com_wr...7c728118c14c54
post #10500 of 16052
I picked-up a new CM4221HD at Fry's last weekend and am still running tests on it.

However, the packaging is a definite problem. The lower bays are getting crushed by the box. The bays fold down to fit in the box, but end up extending beyond the reflector.

I discovered this when I turned it around with the lower bay on top and the box wouldn't close w/o bending the whiskers.

Looking at the bottom of the box, I can see where the whiskers were getting bent and the top of the box had a significant dent showing the pressure of the box holding the bent elements.

I will try to remember to upload a picture of this later, but the resultant bends in the bottom bays are easy to spot, when compared to the others.
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