Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




360 posts

Ultimate Geek
+1 received by user: 3


Topic # 81477 13-Apr-2011 13:40
Send private message

Hi all,
I have a 90cm dish with 1x C band LNB and 2x Ku band LNBs mounted on it, I got the channels I require, no problem with that.

The problem is that the channels on the LNB with the most offset (as expected) get really bad early in the morning(05:00 - 08:00), when I try to watch / record (standalone DVB-S receiver / DVD HDD recorder). If the Sun goes up, the reception improves a lot (signal goes from 25% up to 70 - 75%). This does not happen in the warm mornings, only in the cold mornings, when there is lots of due everywhere (including on the dish). If it is raining, it is working fine (even if the signal is weaker, is perfectly stable and watchable).

I believe it is something to do with the way the water from the rain wets the dish surface (a continuous film - more or less) as opposed to the way the due forms - here and there, dripping down here and there, which makes the surface reflecting the signal to go quite away from the steel shape (due to all the droplets sitting on the dish, I believe).

I am thinking to try and apply a water repellant coating onto the dish surface (silicone / CRC / oil spray?)- could this interfere in any way with the dish characteristics? I do not see any downside, but other people out there with more indepth knowledge of how the signal propagates / reflects might have an opinion?

I am also thinking: if the coating remains sticky then possibly leaves, feathers or even dust will adhere to the surface then possibly making things even worse (and more permanent)? It sounds ridiculous, but did anyone ever saw a dish with a little roof / awning on top to protect against due formation?

(I also thought of using some of the electric underfloor heating cable applied to the back of the dish and controlled by a timer but this is way over the top... ha... ha...).

Any thoughts will be much appreciated.




mobo Intel DH55PJ, RAM: 4GB RAM, Nova-T 500 HD + Avermedia Trinity tuner card, Geforce 520 video, 120GB SSD Sandisk + 640 WD + 1000SG, Win7 Home Prem 64-bit, Media Portal 1.15.0; BTC 9019URF Cordless Keyboard, Panasonic 55" (HDMI cable), HTPC Case Silverstone Grandia GD05B.


Create new topic
Banana?
3908 posts

Uber Geek
+1 received by user: 792

Subscriber

  Reply # 458270 13-Apr-2011 14:26
Send private message

I don't know if it would work, but you could try Rain-Away - works on car windshields. The surface of the dish may be too rough for it to work. Would try it on a small part? If it doesn't work, then you can use the rest of it on your shower glass - magic.

4322 posts

Uber Geek
+1 received by user: 1203


  Reply # 458271 13-Apr-2011 15:33
Send private message

Had you considered it isn't just the temperature affecting the LNB? It's common when they fail for them to only work when it's warm (or vice versa).

 
 
 
 


6445 posts

Uber Geek
+1 received by user: 493

Trusted

  Reply # 458284 13-Apr-2011 15:54
Send private message

Yes or that the alignment is not optimal?

There is also a known problem of issues when the sun aligns directly behind the satellite, but that does not appear to be the case here.

Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Public Wi-Fi plus cloud file sharing
Posted 18-Aug-2017 11:20


D-Link NZ launches professional Wireless AC Wave 2 Access Point for businesses
Posted 17-Aug-2017 19:25


Garmin introduces the Rino 700 five-watt two-way handheld radio
Posted 17-Aug-2017 19:04


Garmin announces the Foretrex 601 and Foretrex 701 Ballistic Edition for outdoor and tactical use
Posted 17-Aug-2017 19:02


Brightstar announces new distribution partnership with Samsung Knox platform in Australia
Posted 17-Aug-2017 17:07


Free gig-enabled WiFi network extends across Dunedin
Posted 17-Aug-2017 17:04


Samsung expands with connect Gear S3 Frontier
Posted 17-Aug-2017 15:55


Fact-checking Southern Cross Next cable is fastest to USA
Posted 17-Aug-2017 13:57


Thurrott says Microsoft Surface is dead last for reliability
Posted 16-Aug-2017 15:19


LibreOffice 5.4 works better with Microsoft Office files
Posted 16-Aug-2017 13:32


Certus launches Cognition
Posted 14-Aug-2017 09:31


Spark adds Cambridge, Turangi to 4.5G network
Posted 10-Aug-2017 17:55


REANNZ network to receive ongoing Government funding through to 2024
Posted 10-Aug-2017 16:05


Chorus backhaul starts with 2degrees
Posted 10-Aug-2017 15:49


New Zealanders cool on data analytics catching benefit fraud
Posted 10-Aug-2017 09:56



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.