Boston, MA - OTA - Page 386 - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 111Likes
Reply
 
Thread Tools
post #11551 of 11558 Old 07-05-2017, 04:07 PM
Senior Member
 
Channel99's Avatar
 
Join Date: Feb 2012
Posts: 214
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 60 Post(s)
Liked: 19
Quote:
Originally Posted by aleckrohto View Post
Can't I install a pre-amp and it will boost the signals to higher levels, for example if I wanted to get WJAR, I would get a CM-4228HD which has 12dB of UHF gain and a channel master amp with 30dB of gain add those numbers together to get 25.7dB.
In theory, the numbers add up OK. However in practice, if the Noise Margin is negative, you would be amplifying noise more than the signal. Also, Tropo reception is dependent on the current atmospheric conditions, and is quite unstable. If there is a possibility of mounting the antenna higher, see what TV Fool shows for 30 or 40 feet.
Channel99 is offline  
Sponsored Links
Advertisement
 
post #11552 of 11558 Old 07-05-2017, 04:12 PM
Member
 
Join Date: Dec 2016
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Liked: 2
Quote:
Originally Posted by Channel99 View Post
In theory, the numbers add up OK. However in practice, if the Noise Margin is negative, you would be amplifying noise more than the signal. Also, Tropo reception is dependent on the current atmospheric conditions, and is quite unstable. If there is a possibility of mounting the antenna higher, see what TV Fool shows for 30 or 40 feet.
When I put it at 40 feet, the NM is -2.8dB, WNAC is at 1.7 and WPRI is at 1.2. Is noise margin the same thing as signal noise ratio? Also, It seems like on my TV fool report that I can get WCVB better than it suggests since the SNR is 29 when near the window. Not sure what to take from all of this.

Last edited by aleckrohto; 07-05-2017 at 04:24 PM.
aleckrohto is offline  
post #11553 of 11558 Old 07-06-2017, 03:17 PM
AVS Forum Special Member
 
bac522's Avatar
 
Join Date: Jan 2003
Posts: 1,265
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 189 Post(s)
Liked: 106
Quote:
Originally Posted by aleckrohto View Post
When I put it at 40 feet, the NM is -2.8dB, WNAC is at 1.7 and WPRI is at 1.2. Is noise margin the same thing as signal noise ratio? Also, It seems like on my TV fool report that I can get WCVB better than it suggests since the SNR is 29 when near the window. Not sure what to take from all of this.
SNR is signal level to noise level ratio, anything above 20 is considered good enough to receive a HDTV signal, the higher the better. Generally under 20 you'll get pixelation and in my experience below 17 and picture drops out completely. Each TV receiver is different though, some have better receiver sensitivity then others.

TVFool guesstimates the Noise Margin, without putting up an antenna it's tough to know what the noise floor will look like at your location.

But why are you trying to get channels out of Providence and Portland when you would have much better luck with Boston and Manchester stations?
bac522 is offline  
 
post #11554 of 11558 Old 07-06-2017, 03:26 PM
Member
 
Join Date: Dec 2016
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Liked: 2
Quote:
Originally Posted by bac522 View Post
SNR is signal level to noise level ratio, anything above 20 is considered good enough to receive a HDTV signal, the higher the better. Generally under 20 you'll get pixelation and in my experience below 17 and picture drops out completely. Each TV receiver is different though, some have better receiver sensitivity then others.

TVFool guesstimates the Noise Margin, without putting up an antenna it's tough to know what the noise floor will look like at your location.

But why are you trying to get channels out of Providence and Portland when you would have much better luck with Boston and Manchester stations?
Just because I get tired of watching my local stations and want some variety. I really think TV Fool is off because it says my noise margin for WUNI-TV is -5.6 at 15ft and I can get that station fine with an indoor antenna.

Last edited by aleckrohto; 07-06-2017 at 03:35 PM.
aleckrohto is offline  
post #11555 of 11558 Old 07-18-2017, 05:25 PM
Member
 
Join Date: Dec 2016
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Liked: 2
Nobody has posted on this thread in the past few weeks or so.. anyway.. This audio issue on WFXT has been going on for a long time now. The surround sound is fine however when I mute the center channel I hear these wired hissing sounds that are some high or low frequency thing and are very annoying. I actually recorded a sample of what it sounds like: https://drive.google.com/file/d/0Bw4...ew?usp=sharing. Anybody have any idea of what this could be. I know this is not normal because I when I checked it on other Fox stations there were no issues
aleckrohto is offline  
post #11556 of 11558 Old 07-19-2017, 12:02 PM
AVS Forum Special Member
 
Patsfan123's Avatar
 
Join Date: Apr 2006
Location: Quincy, MA
Posts: 2,167
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 246 Post(s)
Liked: 156
I've noticed WFXT is out of lipsync while none of my other OTA channels are. I am lucky enough to get RI's Fox affiliate so I've just been using that. It also sounds "different".

LG 65C6P FW: 04.31.00 | Denon AVR-S930H 5.1.2 | Polk Audio Monitor70 Series II Floorstanding Fronts | CS2 Series Center | Monitor40 Series II Bookshelf Rears | Pioneer SP‑T22A‑LR | eD A2-300 | Oppo UDP-203 | Xbox One S | Panasonic DMP-BDT110 | Chromecast Ultra

LG 55EG9100 | LG 60PK550 | Samsung LN-S4095D | Samsung UBD‑K8500 | Philips BDP7501
Collection: Blu-ray
Patsfan123 is online now  
post #11557 of 11558 Old 07-19-2017, 06:29 PM
Senior Member
 
Channel99's Avatar
 
Join Date: Feb 2012
Posts: 214
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 60 Post(s)
Liked: 19
Quote:
Originally Posted by Patsfan123 View Post
I've noticed WFXT is out of lipsync while none of my other OTA channels are. I am lucky enough to get RI's Fox affiliate so I've just been using that. It also sounds "different".
I can receive both also. Checking just now, flipping back and forth, the audio seems to be leading the video on WFXT, but is OK on WNAC. The audio does sound slightly fuller or maybe just higher at the bass end on WNAC. It's hard to tell on that frenetic cooking show. I also noticed the entire signal - audio and video - is about 7 seconds later on WNAC.
Channel99 is offline  
post #11558 of 11558 Old 07-19-2017, 07:53 PM
Member
 
Join Date: Dec 2016
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Liked: 2
I wish they could fix all these issues with Fox 25. It was fine before Cox Media Group. You can bring your concerns to WFXT's director of engineering Sean Anker by emailing him at sean.anker@coxinc.com. I would think a bunch of people emailing him about this would yield a change back to the old FOX O&O decoder settings.
ejb1980 likes this.

Last edited by aleckrohto; 07-19-2017 at 08:12 PM. Reason: Added email info
aleckrohto is offline  
Sponsored Links
Advertisement
 
Reply Local HDTV Info and Reception

Tags
Displays

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