Antenna & Amp Selection - Splitting too? - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 6 Old 04-05-2009, 06:16 PM - Thread Starter
Newbie
 
davlucmac's Avatar
 
Join Date: Apr 2009
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I've been on here lurking for a while, and have been really impressed with the expertise you all bring to the subject of HD OTA... so I'm posing a question here instead of wading in too deep and trying to learn this all myself.

I live near downtown Vienna, VA and converted to HD OTA about two years ago when my wife and I bought a Vizio with built-in HD tuner. We hooked it up to our massive aerial antenna, still stuck on the top of our house (circa 1970s)... though missing a few elements.

Since then I've wanted to pull in a few more stations and split the antenna signal between my HD DVR Tivo and the Vizio. (Turns out the Vizio was MUCH better at pulling in signals by the way)

I figure I'll need to replace everything other than the mast up there for the best HD reception. I was planning on the following:

- Winegard 7696P
- CM-7777
- 30 ft. cable run from antenna to amp
- splitter
- 5 ft run to Vizio & 25 ft run to Tivo HD DVR

My numbers from TVFool and antennaweb are as follows:

DTV Antenna
Type Call Sign Channel Network City, State Live
Date Compass
Heading Miles
From Frequency
Assignment
* yellow
uhf WNVC-DT 57.1 IND FAIRFAX, VA 141° 3.3 57
* red
uhf WJLA-DT 7.1 ABC WASHINGTON, DC 83° 10.7 39
* red
uhf WHUT-DT 32.1 PBS WASHINGTON, DC TBD 83° 10.7 33
* red
vhf WUSA-DT 9.1 CBS WASHINGTON, DC Jun 12, 2009 (post-transition) 83° 10.7 9
* red
uhf WDCA-DT 20.1 MNT WASHINGTON, DC Jun 12, 2009 (post-transition) 81° 10.6 35
* red
uhf WPXW-DT 66.1 ION MANASSAS, VA Jun 12, 2009 (post-transition) 83° 10.7 34
* red
uhf WFDC-DT 14.1 TFA ARLINGTON, VA Jun 12, 2009 (post-transition) 87° 10.4 15
* red
uhf WTTG-DT 5.1 FOX WASHINGTON, DC Jun 12, 2009 (post-transition) 81° 10.6 36
* red
vhf WJLA-DT 7.1 ABC WASHINGTON, DC Jun 12, 2009 (post-transition) 83° 10.7 7
* red
uhf WDCW-DT 50.1 CW WASHINGTON, DC Jun 12, 2009 (post-transition) 84° 13.6 50
* red
uhf WHUT-DT 32.1 PBS WASHINGTON, DC Jun 12, 2009 (post-transition) 83° 10.7 33
* red
uhf WTTG-DT 5.1 FOX WASHINGTON, DC 81° 10.6 36
* red
uhf WRC-DT 4.1 NBC WASHINGTON, DC 87° 10.4 48
* red
uhf WUSA-DT 9.1 CBS WASHINGTON, DC 83° 10.7 34
* red
uhf WFDC-DT 14.1 TFA ARLINGTON, VA 87° 10.4 15
* blue
uhf WDCW-DT 50.1 CW WASHINGTON, DC 84° 13.6 51
* blue
vhf WMDO-LD 47.1 UNI WASHINGTON, DC 87° 10.4 8
* blue
uhf WPXW-DT 66.1 ION MANASSAS, VA 212° 8.7 43
* blue
uhf WETA-DT 26.1 PBS WASHINGTON, DC 83° 10.7 27
* violet
uhf WNVT-DT 30.1 IND GOLDVEIN, VA 216° 21.2 30
* violet
uhf WDCA-DT 20.1 MNT WASHINGTON, DC 83° 10.7 35


Thoughts?
LL
davlucmac is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 04-05-2009, 07:24 PM
AVS Special Member
 
IDRick's Avatar
 
Join Date: Feb 2006
Location: Eastern Idaho
Posts: 1,033
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 24
Welcome to the forums! Very well stated first post! Based on your tvfool, you have a very high power station (WNVC) nearby (3.3 miles). This station is likely to overload the CM 7777. Given the relatively short cable run and limited splitters, I believe the Winegard 269 preamp is appropriate. It accepts much higher inputs without overloading and should provide enough amplification for your needs. The 7696 is a good choice, particularly if you are hoping for the Baltimore stations as well as the DC stations. You may need a rotor to acquire the Baltimore stations.

HTH,

Rick
IDRick is offline  
post #3 of 6 Old 04-05-2009, 07:57 PM - Thread Starter
Newbie
 
davlucmac's Avatar
 
Join Date: Apr 2009
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Rick,

Thanks for the quick reply and valuable input. Based on your comments, I'm actually wondering if my current GE amp is actually being overloaded - causing the Tivo to have some reception issues...

I'm going to remove it from the line to test the configuration without it, but what are some of the symptoms one might find in amp overload?

Regardless, thank you for your suggestions for the ant/amp combination!
davlucmac is offline  
post #4 of 6 Old 04-05-2009, 08:12 PM
AVS Special Member
 
IDRick's Avatar
 
Join Date: Feb 2006
Location: Eastern Idaho
Posts: 1,033
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 24
Poor reception is a common issue with overload. Several individuals have reported poor reception with amped indoor antennas. Switching to a non-amplified antenna increased the number of channels and signal strength in their area. You only have one very strong channel so your results will not be as dramatic but should result in improved reception.

HTH

Rick
IDRick is offline  
post #5 of 6 Old 04-06-2009, 11:09 AM - Thread Starter
Newbie
 
davlucmac's Avatar
 
Join Date: Apr 2009
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I'm also looking at lower-profile options for HDTV reception such as the ChannelMaster CM-4220HD. This would score huge WAF points to replace the behemoth on the roof with something smaller... but would it pick up the balance of the stations on my list? Are there any drawbacks?

METROtenna
2-Bay HDTV / UHF TV Antennas
CM-4220HD / CM-4220MHD
FEATURES & BENEFITS
Designed and tested for high quality HDTV digital
and UHF reception

Use with digital converter box or HD ready TV

Easy installation - Unfold, mount, and connect

Long lasting, durable design:
- Heavy duty aluminum elements
- UV stabilized plastics
- 75 Ohm PC balun built into antenna

Easily mounts to a DBS Mount (included with the
CM-4220MHD) or a traditional antenna mast
(sold separately)

Rooftop, eave, or wall mountable

Transparent design

3 year limited warranty

SPECIFICATIONS
Reception Range
Channels 14 thru 69,
and HD

Up to 30 miles

Antenna Size (L x W x H)

5.5 x 24.5 x 15.25 in

Turning Radius

12 in

CEA*

MD

Bandpass

54 to 806 MHz

FM trap (fixed)

Attenuates 88 to 108 MHz

Amplifier Gain

20 dB
davlucmac is offline  
post #6 of 6 Old 04-06-2009, 11:43 AM
AVS Special Member
 
IDRick's Avatar
 
Join Date: Feb 2006
Location: Eastern Idaho
Posts: 1,033
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 24
The 4220HD is a uhf only antenna. You need an antenna that can pick up high vhf and uhf. You will have three high vhf stations post transition (real ch 7, 8, 9) from the DC area. If you don't care about Baltimore, the winegard 7694 is a good alternative. Or you could look at the HBu-22 or EZ HD. I use the EZ HD and it performs very well. My stations are 30 to 40 miles away and about 10 to 15 dB lower in NM than your local affiliates. It is small and should work well in your area.
IDRick is offline  
Reply HDTV Technical

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off