July 8, 2010
D-STAR SIMPLEX EXPERIMENT
Saturday the 10th of July 2010 I shall be running tests on the DV VHF simplex frequency 144.6125Mz from 10:00 through till 18.00 hrs GMT
The aims of the tests are simple. I would like to establish some statistics on D-Star VHF simplex for comparison with standard FM.
I have already tested it over a short distance and found the audio and signal quality was 100% better. Tests indicate that the simplex mode of DV compared to analogue simplex modes is superior, but I would like to gain more facts. This will require more users to make contact on the day with reports on their location, power and antenna used and if possible a comparison on analogue using the same setup?
To do this I need people who can be on the radio at the same time as me, this could be a very interesting experiment and I am willing to publish those statistics on the South Yorkshire repeater group and my own rotherhamamatuerradio websites for all to make use of.
What we need is;
- for you to register your interest
- to be available on the 10/07/10 form 10:00 till 18.00
- to be able to keep a log
- send your log in (via email)
Anyone wishing to participate please contact Ian M6DER to register your interest.
Later this year I shall be doing some tests using D-Star TV also, anyone wishing to take part in this should contact me as well stating dvtv in the email.
Thanks for your time.
Tags: 10th July 2010,
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d-star TV,
D-Star VHF,
dstar calling channel,
dstar experiment,
dstar simplex,
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DV analouge comparisson,
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simplex experiment,
VHF simplex May 20, 2010
XMIT_ID allows you to record and catalouge the unique “fingerprint” that is part of every FM radio’s transmission. This can be used for transmitter identification.
XMIT_ID was created because of the interference problems that plague repeater systems. Finding the people responsible can be very difficult. Yes, you can use “direction finding techniques” to locate them. But, in the case of malicious interference, you need to positively identify the transmitter being used. The answer is to “fingerprint” the radio. XMIT_ID will store and compare the fingerprints of a radio. It records the radio’s discriminator audio finger print, then time and date stamps every transmission. This makes XMIT_ID an invaluable tool to anyone having interference problems. This program will help you in gathering evidence to help convict the person(s) responsible. Here are some uses for XMIT_ID:
- To find stolen transmitters.
- To help locate transmitter spurs.
- To help identify illegal users on a repeater.
- To stop cellular phone fraud.
The price of this type of equipment can be out of reach for the average ham. Now with XMIT_ID, and the following equipment list, you can get “Finger Prints” of radios.
- a modified receiver or 9600 baud packet ready radio
- DOS 5.0-6.22 (Windows 95 needs a lot of tweeking; it can be done)
- Sound card (A real 8 bit Sound Blaster works the best)
