Evening Np Signal For Truevissions And Gmmz

[revar]

During the day my truevissions and gmmz boxes work fine. But in the evening/night both give no signal messages. Similar to what happens during big storms. Looks like something blocks the signals in tje evening. What can do this for satalites. ot started seberal weeks ago and is the same every day.

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[wayned]

I have both GMM Z and True Vision units and have not seen this problem. Twice a year the satellite is directly between the sun and Thailand for short a short period of time during the afternoon for a few days (March and September). The receiver cannot decode the satellite signal from the noise that the sun generates and there are short periods, 15 - 20 minutes, where there is no signal. It is called "Sun Outage" and true visions had posted messages to that effect. However, this period has now past and , of course, would only happen during the day.

[Pib]

Unless the OP has a line of sight obstruction to the satellite which he can see, like a tree or another building, sounds like it's just a poorly aligned satellite dish...maybe it loose and got moved by the wind. Or maybe a weak LNB (but not likely) or bad cable connection between dish and boxes.

[TwentyBaht]

Just a thought.

Maybe, LNB frequency drift due to changing temps.

Try another LNB. And, rescan the transponders.

Cheers

[lopburi3]

Take a good look at direct line your dish is pointing and see if there is anything new that might be blocking signal a bit at night - like another building closing a metal awning/window cover or something. As said your dish and LNA likely need alignment if nothing obvious in path. Temp could be a factor as mentioned above if normally in direct sunlight during the day.

[ThaidDown]

Suggest also check signal and quality levels when box is working. If not optimum might indicate alignment problem.

If signal quality on the edge then any small variation due possibly to temp could make it not lock.

[Crossy]

Odd that it only happens at night.

Not got a pigeon or something similar making its roost in front of the LNB have we?

[delboy]

I have the same problem. It started about 3 weeks ago and only happens between about 8pm and 2 am. There is no obstruction, and the night sky is clear. I can see the stars very clearly. I phoned TrueVisions and they said that it's due to heavy rain, but we haven't had any rain for weeks. After a lot of discussion, 2 experts arrived, inspected the dish and cable and proclaimed that it was a fauty receiver, which they replaced. That was 5 days ago, and it made no difference whatsoever.

The strange thing is that it seems to be the foreign stations that are most affected. The Thai TV stations are fine and some international stations such as ESPN and BBC World are also uneffected, but the sports channels suffer the most. However, it's also not the same channels each night that are affected.

[Pib]

Sounds like it may be combination of TrueVisions ground station downlink/uplink power and power received at the person's dish. TrueVisions must first downlink some foreign TV channels from another satellite(s) and then uplink it to the Thaicom5 satellite which in turns broadcasts it back down to residential dishes. If the uplink to Thaicom5 is being affected (i.e., lower powerlevel uplink) then the rebroadcast down from the satellite can be affected/reduced power level. Combine that with a misaligned residential dish, maybe being in a part of the country where the signal is not quite as strong, etc., and person could experience this reception problem on certain channels.

I remember when I was still on TrueVision Satellite (I'm now on TrueVision Cable) but there were times where the sky my optimally aligned dish was pointed at was clear/no rain clouds yet, but it was very cloudy/raining in the direction of the TrueVisions groundstation (which I think is in the Nonthaburi Province kinda on the northwest side of Bangkok) and my TrueVisions reception was affected on some channels.

[revar]

pib,

this might be it since I have now found out that on true the 'normal' thai channels like channel 7 are still there. its only the foreign channels which give a no signal. still find it strange that the rime they dissapear and appear is so consistant. at 06.00 am the are back again but at around 18.00 am they disappear. this might happen earlier since I noemally come home at 18.00 but the times I was at home at1500 the channels were there.

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[Pib]

Channel 7 is probably the strongest signal received...even stronger than the other main Thai channels of 3, 5, & 9 which are also strong. For the Thai channels the ThaiVisions ground/uplink station initially gets these stations via ground links...but for most foreign stations they must get the from other satellites and beam them up to Thaicom5 which usually means they are transmitting back down at a little lower power....or at least that is what I noticed signal strength-wise when I was on TrueVisions satellite. I think you really need to have your dish alignment checked....and have it aligned/optimized while on one of the foreign/weaker strength channels as this will give you a more precise alignment. I could be that once the sun goes down the atmospheric changes is causing a small signal strength reduction---just enough to lose reception especially if the dish is not aligned properly or some other problem like a funky cable run connection is causing a signal reduction problem. Good luck

[revar]

Realigning did not help. But since last week the channels are back the whole day again. Very strange.

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[Pib]

Good it's working for you again. If you have a funky/corroded/loose cable connection changes in temp/humidity can cause that connection point to get better or worst affecting signal and voltage flow. And I don't mean just the received signal traveling down the cable between the LNB and your settop boxes, I also mean the LNB power voltage of 13VDC (Vertical Polarity) and/or 18VDC (Horizontal Polarity) traveling up the cable from your settop boxes to th LNB...this 13/18V is what powers your LNB.

For TrueVisions and Grammy, the 18V is used since the satellite signal is transmitted using the Horizontal polarity so the LNB has to be placed in the Horizonatal mode of operation which that 18VDC accomplishes....13VDC sets it to Vertical polarity. Maybe you didn't have close to 18V reaching the LNB come evening due to a funky connection changing in resistance due to temp/humidity...the LNB then felt like it was getting a 13V signal and switched to Vertical polarity mode which would cause loss of horizontal signals from the satellite.

Also, this summer my mother-in-law had a C-band reception problem where from about 12 noon to about 4pm--or the heat of the day--she would lose reception on a lot channels (the horizontal polarity channels) on one of her two settop boxes...but before high noon and after 4pm when it was cooler the signal reception worked fine...but on cloudy/cooler days the reception remained all day...but if it was a hot, sunny day the reception would disappear around noon to 4pm. Switching the boxes around didn't help. Now, this problem was not caused by a cable funky connection but a failing LNB which would fail when getting hot during mid day and start working again when it was cooler in the morning/evening/night. After replacing the faultly C-band LNB I took the cover off covering the LNB's electronics circuit board and spotted a cold solder joint between the LNB's cable connector center conductor and circuit board....I mean you could wiggle the connector and see movement at where the center conductor was soldered to the circuit board. This was a 2-output LNB and the other output connection point at the circuit board was soldered rock solid. I expect during the heat of the day that cold solder joint connection would increase in resistance causing a funky any horizontal channel selection needing 18V to instead probably see something closer to 13V and fall to pickup that horizontal channel. Now, you problem seems to be the reverse---that is, falls when cooler--but when it comes to electronics, funky connections, temp/humidity strange things can happen...things that seem to defy logic--kinda like Thailand. Anyway, I resolded that funky connection and in doing some testing the LNB appears to work fine now. Now, I didn't climb back-up on the mother-in-law's house roof to put the old LNB back on....I'll just keep it as spare.

Good to hear it's working again for you.