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

392 posts

Ultimate Geek

# 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
4905 posts

Uber Geek


  # 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.

5655 posts

Uber Geek

  # 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).


6995 posts

Uber Geek


  # 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 and LinkedIn »

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 »

Vodafone New Zealand starts two year partnership with LetsPlay.Live
Posted 28-Jan-2020 11:24

Ring launches indoor-only security camera
Posted 23-Jan-2020 17:26

New report findings will help schools implement the digital technologies curriculum content
Posted 23-Jan-2020 17:25

N4L to upgrade & support wireless internet inside schools
Posted 23-Jan-2020 17:22

Netflix releases 21 Studio Ghibli works
Posted 22-Jan-2020 11:42

Vodafone integrates eSIM into device and wearable roadmap
Posted 17-Jan-2020 09:45

Do you need this camera app? Group investigates privacy implications
Posted 16-Jan-2020 03:30

JBL launches headphones range designed for gaming
Posted 13-Jan-2020 09:59

Withings introduces ScanWatch wearable combining ECG and sleep apnea detection
Posted 9-Jan-2020 18:34

NZ Police releases public app
Posted 8-Jan-2020 11:43

Suunto 7 combine sports and smart features on new smartwatch generation
Posted 7-Jan-2020 16:06

Intel brings innovation with technology spanning the cloud, network, edge and PC
Posted 7-Jan-2020 15:54

AMD announces high performance desktop and ultrathin laptop processors
Posted 7-Jan-2020 15:42

AMD unveils four new desktop and mobile GPUs including AMD Radeon RX 5600
Posted 7-Jan-2020 15:32

Consolidation in video streaming market with Spark selling Lightbox to Sky
Posted 19-Dec-2019 09:09

Geekzone Live »

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

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

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.