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Old 18th July 2007, 12:50   #121
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Originally Posted by omishra View Post
Yes they sell it separately. After installing Worldspace radio, I noticed that some channels have lower gain. This was due to big tree in LOS. Then I bought Yagi antenna ~400 + ~250 = (~650Rs with LNA) and 20meter cable for 200Rs. But when ever I tried this yagi too off LOS, signal is lost (no success so far).

Frequency for transmission is 1452-1492 MHz
Whoa! Yagi antenna for satellite? The "Dish" antenna will give you better gain than a Yagi Array.
In case of dish, what the dish is doing is concentrating the signal at the focal point, at which the dipole sits.
Yagi will not give that kind of gain, and is best suited for much stronger transmissions from near terrestrial stations.
Interesting article regarding a omnidirectional satellite antenna for mobile platforms
Team develops in-car satellite TV | News, Media, and Events | University of Waterloo
University of Waterloo developed this antenna.
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Old 18th July 2007, 13:00   #122
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I noticed that some channels have lower gain. This was due to big tree in LOS...
Frequency for transmission is 1452-1492 MHz
Did you mean to say, for exaample, "Riff" is louder than "Jhankaar"?

That would not be due to RF signal strength. All WS channels are digital transmission where the channel's audio signal strength is not dependant on the microwave carrier signal strength. The reason would most likely be that the audio feeds on the transmission side are not level-equalized.
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Old 18th July 2007, 13:14   #123
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Whoa! Yagi antenna for satellite? The "Dish" antenna will give you better gain than a Yagi Array...
@tsk, WS has been selling YAs in India whenever customers complain about 'signal strength'!!! What would you say of that?

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Interesting article regarding a omnidirectional satellite antenna for mobile platforms
Team develops in-car satellite TV | News, Media, and Events | University of Waterloo
University of Waterloo developed this antenna.
Interesting no doubt. However, their current "tiny package less than 81 cm in diameter and 11 cm high" is rather massive at 24"x4" - larger than Tata Sky or Dish TV dishes. Omni-directional is the over-riding advantage - soon we will see smaller ones as the money rolls in.
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Old 18th July 2007, 14:14   #124
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But as the OP mentioned, Yagi antenna is not giving much benefit. Most dishtv installations I have seen in north India just have a single dish, did not see any Yagi Arrays

As for the omnidirectional antenna, it may be huge, but you cannot use a directional antenna on a mobile platform.

Research will lead to smaller antennas but the funny thing about antenna and related amp design is that you cannot beat physics.
The only saving grace here is small wavelength, so the dipole can be kept small, but in case of weak signal you would need to have very good L.Noise amplification.
Low noise Amplification of such high freq signals means very expensive equipment.
In a big vehicle you can go with a directional array mounted on a "telescope like" mount which will be good enough if you are not driving on twisties.
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Old 18th July 2007, 15:02   #125
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Originally Posted by DerAlte View Post
Did you mean to say, for exaample, "Riff" is louder than "Jhankaar"?
Jhankaar is ALWAYS loud...even with bad signals its Loud, but it just keeps breaking.

WS said that their Car antenna will be available shortly , however, how shortly is a question.

@ TSK - my setup was very simple. I plonked it into the roof, near the back.

sorry about the bad image - did not think that a thread like this would come up
Anyways- i think i will try finding a LNA and connecting it in the car and checking if it works.
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Old 18th July 2007, 16:24   #126
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OEM, patch antenna has lowest gain and widest beamwidth. Next is yagi. And sharpest beam is from parabolic reflectors (dish) and more gain.

This yagi antenna is singal piece diacasted aluminum with powder coating

Gain: dish antenna > Yagi > patch
Beamwidth: dish antenna < yagi < patch

Less Gain: sound quality is not affected by less gain but interruption is more from nearest mobile phone. + I felt some hiss

But let me get some time, I will try to build omni directional antenna. Now its almost 8 yrs I lost touch with microwave/satellite communication hands on.

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Originally Posted by madan80 View Post
Anyways- i think i will try finding a LNA and connecting it in the car and checking if it works.
Your patch antenna already has a inbuilt LNA. No need to connect anything other than that.

Last edited by tsk1979 : 18th July 2007 at 17:23.
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Old 27th August 2007, 16:14   #127
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Thumbs down World space in a car

Hey guys,

Not sure if this is relevant any more, just talked to one of the Marketing heads at world space... They say that they do have the ability to get Sat radio on to the car, and its more a licensing issue that anything else.
They say that the government has to give them a license and they have applied more than a year back.

Once they do they will be able to provide you the same just like FM.

Cheers
Paiyappa
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Old 5th September 2007, 09:56   #128
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AFAIK, WorldSpace in Europe do sell a mobile antenna for use in cars.
And there is a company in Thailand that offers an omni-directional 'boat antenna' for WorldSpace radios. That's a shop called Radio 100 at Phuket, if my memory serves.
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Old 5th September 2007, 12:04   #129
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Its 128kbps streaming only for a few specific channels. Most channels are 64-96kbps. Pathetic quality. I got one but couldn't stand it for more than a week. The biggest problem is that the receiver doesn't even have an SPDIF out which means one must use the crappy DAC and output stage inside it.
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Old 5th September 2007, 12:58   #130
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Let's be fair, Reignofchaos! We use the WS radio NOT for excellence of technical quality but because in our great homeland there are pitiably few FM channels and NOT ONE that meets my 'requirements'.
What you say is true. I do not use my WS for 'archiving' purposes; only for '24X7' music in the background. As an intense music-lover and an audiophile, my 'serious' listening is always done via audio CDs thru a 901 system. And by the way I do still use some compact cassettes recorded (with dbx encoding) from vinyl records back in the late 70s and early 80s!
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Old 5th September 2007, 13:25   #131
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Default XM or WS...

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Originally Posted by navin View Post
does XM exist in India?
No Navin, XM is not for India. It'll be WorldSpace here always. They are partners though, I think. XM offers a lot more and at superior quality, including mobile application.
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Old 3rd January 2009, 18:22   #132
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more than a year gone since the last post eight gone since i first heard about WS working on a car reciever! are we going to see anything??
@ anupmathur: an audiophile will surely have a kick a** sound system in his car, and i dont think he would be willing to loose out on sound quality, he would rather go through the pain of burning CDs or in retrospect use an ipod!!
The advantage of a satelite radio lies in specialised chanels and the surprise element of a nice song popping up each time, somehow knowing whats next isn't always as much fun!
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Old 24th March 2009, 16:18   #133
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2005 to 2009.... and we are still waiting for an in car worldspace receiver.. Looks like WorldSpace guys have read too much into the hare and Tortoise story !!!
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Old 24th March 2009, 17:16   #134
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2005 to 2009.... and we are still waiting for an in car worldspace receiver.. Looks like WorldSpace guys have read too much into the hare and Tortoise story !!!
Yea, and WS seems to be dying a slow death......
Nothing new or better to offer ........... numerous failures of transmission ......... miserable lineup of receivers etc.
My WS is on 24X7 and in the last few months I have found, during my waking hours, sudden loss of music (signal strength normal, but no music), loss of all signals for a few hours (& apologies the following day). Certainly seems to be going downhill.
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Old 24th March 2009, 17:30   #135
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Worldspace is in a tight corner because that are not able to make enough revenue nor increase their footprint in the country. Only option is for the Govt. to permit airing commercial advts on the channel and they making some revenue in the process to upgrade quality.
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