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01-21-2017, 09:54 AM
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#1
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Registered User
Join Date: Aug 2014
Location: western NC mountains!
Posts: 4,106
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Jensen 12v TV screen 'ghosting' with DISH receiver...(?)
here's a good problem you Satellite techies can try to assist me with...
my bedroom Jensen 12v TV periodically has a 'ghosting' or severe 'contrast' type problem sometimes when using the DISH VIP211k receiver on satellite channels.
The screen problem is very strange, almost like is has a 'ghost' or 'shadow' as movement of people or things on the screen move... it's weird, and a new phenomenon as we have used this setup for several years with no on-screen issues before...
facts:
- the TV itself does not 'seem' to be the root of the problem since the on-screen remote Volume and Mute icons are bright, as normal, even when the tv channel I am watching is 'ghosting', and the TV used in Antenna mode looks normal when watching local channels.
- I can sometimes turn on the TV and receiver and everything is normal, but 30 minutes later the TV may suddenly start this 'ghosting' on the screen for the rest of the time I am watching, which could be hours. Audio is normal. Sometimes I will view tv at night with this problem, but wake up in the morning and everything is back to normal(!)
- I thought it might be low 12v voltage, but when the generator is running and providing full power to the inverter, it also may work fine, and then start 'ghosting' later - bummer...
- the Receiver is a VIP211k, and WAS replaced recently from the original unit because it stopped working - DISH sent this replacement. I'm not sure if others have seen this issue with their receiver(?)
*My initial idea was that the TV is having a problem with it's 12v connection, but unplugging and replugging changes nothing while it is 'ghosting'. Everything else, 12v wise, in the coach is operating as normal. The receiver is on the inverter, and all other inverter devices are working properly.
*I then thought that it was the new receiver, but I took it into my home and it operates properly with any other tv, with no screen issues.
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01-21-2017, 06:16 PM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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Often ghosting is caused by a splitter with an open end. Adding a 75 ohm terminator to the open connection can usually eliminate or reduce ghosting on coax connections. Have any other changes, deletions or additions been made to the system?
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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01-22-2017, 10:06 AM
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#3
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Registered User
Join Date: Aug 2014
Location: western NC mountains!
Posts: 4,106
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thanks, I'll give that a shot and let you know...
the only 'splitter' between the antenna and the receiver is an a/b switch, which does have an open output since I only use it to 'disconnect' the receiver from the antenna overnight to cut the power and the 'movement' of the antenna(KingTailgater2)
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01-22-2017, 10:24 AM
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#4
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Registered User
Join Date: Nov 2016
Location: indio california
Posts: 963
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Quote:
Originally Posted by MisterT
thanks, I'll give that a shot and let you know...
the only 'splitter' between the antenna and the receiver is an a/b switch, which does have an open output since I only use it to 'disconnect' the receiver from the antenna overnight to cut the power and the 'movement' of the antenna(KingTailgater2)
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WHY? the amount of power being sent to the antenna and the updates that occur are miniscule at best.
I was told that cutting receiver power to the dish causes a complete reboot of system every time one goes to use it?
(what wineguard claims)
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01-22-2017, 10:28 AM
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#5
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Registered User
Join Date: Aug 2014
Location: western NC mountains!
Posts: 4,106
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Quote:
Originally Posted by select55
WHY? the amount of power being sent to the antenna and the updates that occur are miniscule at best.
I was told that cutting receiver power to the dish causes a complete reboot of system every time one goes to use it?
(what wineguard claims)
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I don't have a Winegard, I have a King Tailgater2, which receives it's power thru the coax cable from the receiver... I am not cutting the power to the antenna to reduce power usage, but to stop the antenna from 'correcting' itself all night long, which is an aggravating sound when it is mounted over your bed on the roof. Also, it does NOT make your receiver REBOOT, since you are only cutting the signal to the antenna, not the power to the receiver. It's like turning off your tv, it does not require your receiver to reboot, either.
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01-22-2017, 10:34 AM
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#6
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Registered User
Join Date: Nov 2016
Location: indio california
Posts: 963
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Quote:
Originally Posted by MisterT
I don't have a Winegard, I have a King Tailgater2, which receives it's power thru the coax cable from the receiver... I am not cutting the power to the antenna to reduce power usage, but to stop the antenna from 'correcting' itself all night long, which is an aggravating sound when it is mounted over your bed on the roof. Also, it does NOT make your receiver REBOOT, since you are only cutting the signal to the antenna, not the power to the receiver. It's like turning off your tv, it does not require your receiver to reboot, either.
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OK I see Wineguard says not to cut power(12V) to antenna so thats why I ask
Mine seems to update around noon each day and is quiet enough one can barely hear it if you listen real close Actually I never meant receiver reboot I meant dish reboot s they say it will loose its memory.
Obviously your not experiencing this problem. Iam just going by what wineguard suggested
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01-22-2017, 10:44 AM
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#7
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Registered User
Join Date: Aug 2014
Location: western NC mountains!
Posts: 4,106
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two different systems - the tailgater and others are powered thru the receiver COAX connection, but others like yours may require a 12v power input, which brings about differences when it comes to disconnecting the power.
since my a/b switch only disconnects the 'connection' between the receiver(which always has 120v power) and the Tailgater antenna, there is nothing loss since the antenna has no 'memory' of it's own. in the morning, when I switch the a/b back to the antenna, it is still on the same Satellite and Channel as I had left it the night before.
as for the daily 'download' for Dish, I have mine set to sometime during the day, such as 1pm, so that it will 'ask' me before it automatically downloads, in case I don't want it to, or I am watching tv at that moment. the daily update is not normally critical unless Dish has changed something on their end, which doesn't happen very often.
as for the 'sound' the antenna makes when it moves, I'm sure some units are quieter than others, or if you antenna is roof mounted closer to the middle or front of your coach it will not bother you during the night... the Tailgater has a periodic 'self correction' several times each minute to make sure that it's 'on target' with the satellite, EVEN when the receiver itself has been turned off for the night - there is still power to the antenna from the receiver, unless you actually unplug the receiver, but that would then require a 're scan' or reboot in the morning.
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01-22-2017, 12:37 PM
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#8
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Registered User
Join Date: Nov 2016
Location: indio california
Posts: 963
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QUOTE:two different systems - the tailgater and others are powered thru the receiver COAX connection, but others like yours may require a 12v power input, which brings about differences when it comes to disconnecting the power.
no both systems use 12 volt signal from receiver to power antenna
Quote:
there is still power to the antenna from the receiver, unless you actually unplug the receiver, but that would then require a 're scan' or reboot in the morning.
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but now there will be no power to antenna with AB switch ? correct
regarding when it updates I will look and see if have the same option as u for allowing updates as far as dish moving all the time constantly like yours? mine does not it maybe does it once or 3 times a day at most
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01-22-2017, 03:23 PM
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#9
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Registered User
Join Date: Aug 2014
Location: western NC mountains!
Posts: 4,106
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Quote:
Originally Posted by select55
QUOTE....
no both systems use 12 volt signal from receiver to power antenna[/I]
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no, several systems require the connection of a separate 12v input for power to the Antenna itself
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01-22-2017, 03:29 PM
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#10
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Registered User
Join Date: Nov 2016
Location: indio california
Posts: 963
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Quote:
Originally Posted by MisterT
no, several systems require the connection of a separate 12v input for power to the Antenna itself
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your misreading things here I clearly said your system and my system both use the receiver to power the automatic antenna
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01-22-2017, 04:28 PM
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#11
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Ok, in normal satellite operation the VIP-211K would be in the "MAIN" Tv area, the bedroom is likely fed off the OUT TO TV coax connector.
If that is not the case, Skip to the next reply.
Now there are several ways to "Split" a TV signal to multiple TV's Locations
OFTEN a motor home may have a Front (Main) TV, a Rear (Bedroom) and an OUTSIDE, but the OUTSIDE may or may not be there.. (mine is not, I also have a few other places I can stick one)
SOMETIMES, (Depending on the quality of the splitter) the unterminated coax from the other (Missing) tv's will "Reflect" back
The solution: Radio shack sells a "Terminator" thingies, Looks like a 7/16" nut (Standard coax nut) with a Nipple.
Suspect 2..
Sometimes there is an issue with the coax. a sharp bend or a staple or a connector not fully attached or loose can cause what we call a STANDING WAVE
This is a wave that goes back and forth, back and forth, Back and forth, and of course every time it goes forth you see a ghost image. On Analog
(On digital this can basically kick it to kingdom come and cause your receiver to loose "lock" and refuse to show anything)
__________________
Home is where I park it!
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01-31-2017, 10:15 AM
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#12
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Senior Member
Join Date: Aug 2015
Posts: 271
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This veered of into an antenna discussion but "Ghosts" in a TV image are almost always something in the video going into the TV - check all the connections from the back of the TV to the signal source. Unterminated connections are a bad idea so you really should b]out a standard termination on that open port.
Re saving power by 'turning the antenna off' overnight - the question in my mind would be the comparison between what you save compared to the power used to reacquire the satellite the next day. Personally, I don't like turning electronics off and on more than I have to.
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