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Using the C_Band from the Atlantic Bird-3 Satellite for the Reception of Weather Satellite Photos

Kobus Botha (South Africa)

During February 2004 I decided to go for MSG of Eumetsat and

gave myself five months to receive my first pictures--but

what an experience it was.

Firstly I registered with EUMETSAT--very nice people

there. I then bought the hardware and had a special

computer built for me. My dish is a 1.8-metre solid dish.

The LNB is a Zintech C-band (uplink 3.4 - 4.2 GHz,

downlink 950 - 1750 MHz, polarization is dualpol and

noise temperature is 17K).

It was not so difficult to locate the satellite. I used a

computer program to calculate it for me.The program I used was Satco DX. You can use this program to calculate the exact position of the satellite for your particular position. You have to put in your coordinates in the program- it will then indicate graphically your position on a nice map as well as the dish size needed and the azimuth and elevation of the dish(please see the screen shot).

In my case the azimuth is 304 and the elevation 43. I manual turned the dish more or less in the correct position. The cable was at this stage already connected to the Vbox card (more details later)in my computer.Please note that at this stage you must configure your Vbox card - I will explain how to do this later in this article.I used a signal strength meter( there are many types on the market- I used the Satfinder which is available at most dealers in dishes)to get the best signal(it is indicated on a scale of 1-10 on the meter) although this meter was not good enough for the final adjustments which had to be completed from the computer(I will explain this later).I cut the cable about two metres from the dish and inserted the signal strength meter there. So I finally turned the dish manually till I received the strongest signal. The meter was removed and replaced by a barrel connector. Back at my computer the signal strength was 82% as indicated on the software of Vbox.My cable length is about 40 metres, so I fitted an inline amplifier(at the position where the cable was cut) to find that the signal was better without it!

I really suffered with the receiving card. Firstly I used an

ordinary TV card but after many hours realised that the

sotfware supplied with it was not compatable with the Tellique software of

EUMETSAT. So I bought the card which Eumetsat tested, the Broadlogic Vbox 2030 PCI card.Very important here is that the software of the card must make provision for TCP-IP settings.

Please remove any firewalls on your computer- if not you will have major software problems.

My computer is a Pentium-4 with 2.8 GHz processor, 1GB

RAM and 80GB hard drive. The graphics card has 128MB

built in RAM. I use only one computer and now have

absolutely no problems. I do everything at the same time:

receiving, decoding, saving, animating and all the other

options. You really do not need two computers. I use the

excellent software of David Taylor- and really enjoy the animator program.

Now back to the final adjustments of the dish.I spent many hours on this part, specially to get the best position of the polarization of the LNB.The polarization of the LNB is very important- polarization means that the plane of the receiving part of the LNB must be the same as that of the transponder of the satellite- in the case of Atlantic bird it is circular-left(when a normal yagi antenna is for example in a vertical position, the polarization will be vertical, etc.).To get the LNB in the best position it must thus be turned-circularly. The signal strength meter is not good enough for this job. In the case of the Vbox the software indicate the signal to noise ratio(see the screen-shot on "tuner status". You need two persons for this job- one to turn the LNB and one to check the signal to noise ratio on the software of Vbox- both with a two-way radio to communicate. Try to get the highest figure- if possible 3 or higher. This figure is changing continuously- it may even go negative, but don't worry. On average it should be more or less between 2 and 3.

Always remember that you will have a voltage between 13 and 18 in your cable to the LNB- be very carefull for a short- especially when you change the signal meter, etc. To play safe disconnect the cable from the computer(this current is supplied by the computer via the receiver card to the connector for the cable).

All the problems I experienced are now history. The

compensation of the stunning pictures which I receive is

fantastic. I really enjoy MSG every day, and my system

runs 24 hours per day. I hope that this article will help

other people interested in MSG who have to make use of

Atlantic Bird. To see some of the photos,you can visit the website below.

Kobus Botha(Dr)

www.weatherphotos.co.za

Internal Vs. External Antennas on Cell Phones

Here are some thoughts about internal and external antennas on cell phones. Is it true that external antennas picks up and holds a signal better than internal antennas? I was just wondering about the signal strength and quality in the phone, that's about it.

Well, the thing is that technology has come thus far that we no longer require the age-old antennas that the old Nokia's used before. An internal antenna would work just as fine as an external antenna, which however means that you are purchasing a good model phone and not some really cheap model.

A Motorola V3x has an internal antenna, which works wonderfully great. I don't even have any problems with reception, which is amazing!

I feel that an internal antenna is superior to the external antenna in wireless devices. An external antenna can easily get broken or cracked and then your phone is basically useless or should I say ruined. Many of the manufactures' have now gone to internal antennas and the devices are much better than the old external antenna devices. In looking at today's devices, the Samsung and LG phones still seem to have external antennas and the Motorola devices are now all internal.

The Nokia and Sony devices also have internal antennas. All of the PDAs now have internal antennas, including the newer Treos. Sound quality is based on the phone model, itself, but as far as getting and retaining signal strength, I think you will find that the phones with internal antennas, such as the Razr, several of the Sony models and the PDAs are better than those devices with external antennas.

I have looked a several external antennas for my cell phone. (I have a Motorola V120) I noticed that the antenna had a smaller coaxial cable with it. My question is would it be possible to attach my cell phone to the TV antenna or would this make a problem? I can not pick up anything where I live. There are main power lines not to far from my house. I think that prevents me from receiving a signal. If this would not work will the other external cell phone antennas do anything?

Televisions operate in a different frequency range than cellular phones so hooking up to a television antenna will not improve your signal. If you have absolutely no signal at your house and have to travel a distance before you pick up a signal the prospects are grim. If you have some kind of signal outside of your house then an external antenna should help you. In addition to an external antenna an inline amplifier would strengthen your signal ever more.

I have an LG phone using Verizon service. In or outside of my house my signal varies from 1 to 4 in strength even when I'm perfectly still. I don't think the little flat antenna boosters that go behind the battery are working. I mean, my calls are dropping like flies. It's ridiculous!

My advice is for you to try doing a *228 (send) option 2 to your phone. You should consider doing that once a month to update the most recent tower list. However, if that doesn't work, then you should think about purchasing an antenna that does work with your phone. The only thing is that the antenna would need to be plugged in.

About the Author

Victor Epand is an expert agent for BuyCellularPhones.info, a huge cellphone superstore featuring great prices and rebates on cellphones including Motorola, Samsung, Nokia, Audiovox, LG, RIM Blackberry, Sanyo, Sony Ericsson, and others.

recommendation for antenna(indoor) amplifier for dig converter?

have rabbitt ears 5 buck radio shack piece of junka moola,get a lot of channels,not bad color with old zenith made in mejeeco ss1917(80 bucks used),,,,better color tones than lotta 2ft hd screens in sports bars,,signal strength on apex dt250a is 47 to 65%

The Converter Boxes are DTV (Digital Television) You need to purchase a digital antenna that picks up the digital signal. Here is a few antennas of choice.

TERK HD-TVi Indoor HDTV Antenna
Terk Passive HDTV UHF VHF Indoor Antenna
Channel Master 4040 Indoor HDTV antenna

Target, Walmart, K-Mart, Bestbuy, Radio Shack all sell the indoor antennas needed for you DTV Convertor Box which they also sell.

Hope this helps

Mouse

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