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Welcome to the web site of

G B 7 B D

Free Star* Dstar repeater for Bristol

www.gb7bd.org.uk

439.450MHz split -9MHz


GB7BD is part of the Frys Hill Repeater Group



PLEASE support the repeaters!


Many people think that UK Repeaters are funded by the RSGB or by OFCOM. This is simply NOT TRUE!

All UK repeaters are funded by donations or subscriptions of their users.

There are significant running costs associated with the repeaters and all the internet facilities. These are paid by the Frys Hill Repeater Group. To ensure their continued operation, please consider making a donation, by using the secure Paypal DONATE button below. This button will open a new encrypted web page to facilitate your safe and secure donation to the repeater group account. (Note you DON'T need a Paypal account, just a credit or debt card.)

If you prefer not to use Paypal and would like to send a donation, please use the address found on the main repeater group web pages here: GB3FH.ORG.UK






Here is a no-frills web site to provide information and support to users of the repeater.

First and foremost, thanks to all those who made this repeater possible:

You can find out all about the Free Star* project by checking out Ramesh's web site here:

http://www.va3uv.com/freestar.htm



So, what is Dstar anyway?

Well, I will leave you to Google the absolute answer to that one but for our purposes here, the differences between Dstar and normal FM conversations / repeater linking are:

Dstar doesn't use analogue (FM, AM etc ) modulation in the traditional sense but GMSK modulation, a form of narrow band digital transmission. Your speech is transformed inside your radio into a binary code. The 1's and 0's are then coded and compressed and transmitted over the radio, throough the repeater, via the internet to another repeater, into another radio where it is then decoded. This has a number of advantages.

GMSK is much more resilient to co channel interference than FM. You wont hear any hiss or crackles on Dstar. It will either be perfect speech or nothing!

Dstar uses Callsign Routing. This is where you can simply enter the callsign of the person you wish to speak to and call them up. The system does all the hard work of finding out where that person was last heard and linking your local repeater to the one where your buddy is located. And it does it in an instant! Very cool!

Dstar transmits slow speed data along with your speech. This can be used for simple messages like telling you what the repeater is linked to or perhaps the remote station's name and location. Some sets are equipped with GPS receivers and you can track them on the web. Their location can be seen on your Dstar radio. This is also used for controlling the repeater etc.

So, in a nutshell, that is Dstar for you. There is an awful lot more to it than that of course but its a start!





G4RKY 1/1/2012


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