Crime Stoppers
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Crime Stoppers
removed.
Last edited by 415Tango on Sun Apr 04, 2010 9:00 pm, edited 1 time in total.
Charles
ACREM 415 Tango - Gold Coast Division
Mobile / Base - Uniden UH500SX
Handheld - Uniden UH065SX
ACREM 415 Tango - Gold Coast Division
Mobile / Base - Uniden UH500SX
Handheld - Uniden UH065SX
- Phil
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Re: Crime Stoppers
hi 415Tango,
Fantastic info you have provided at the moment the Motorola Zeon Digital Network is unlistenable as it is a digitally encrypted trunked network although the lower frequencies you provided for example 468.25 is a Special Events channel which today is being used for the QPS at the Big Day Out not alot of chat but enough to know where they are coming from
Fantastic info you have provided at the moment the Motorola Zeon Digital Network is unlistenable as it is a digitally encrypted trunked network although the lower frequencies you provided for example 468.25 is a Special Events channel which today is being used for the QPS at the Big Day Out not alot of chat but enough to know where they are coming from
Phil
Forum Administrator
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Forum Administrator
phil@aussiescanners.com.au
Uniden UBCD996T, RH96, UBCD396xt, Uniden UBCD563-PT
RTL-SDRs way to many
Motorola GP328, GP338, GP328 Plus, XTS3000, DP3400 VHF, DP2600e, DP4801e, DM4601e, XTL5000-03, XTS2500 M3
Simoco SRM9030 AC, SRM9022 UW
Hytera - PD412, PD462, PD682, MD782G, PD782G
Barrett 950
Icom IC-F60, IC-410 Pro
Tait TM8250
Kenwood - NX720HG
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Re: Crime Stoppers
The original poster said that the frequencies are between 505 and 515 MHz, so it is NOT the Motorola Zeon Digital Network (which is between 865.0125 and 869.9875 MHz). And while MOST Tetra networks are encrypted by default, it is apparently NOT a Mandatory requirement. However, having said that, it is true that there is currently NO scanner available that will monitor Tetra, encrypted, or otherwise.brisbanescan wrote:hi 415Tango,
Fantastic info you have provided at the moment the Motorola Zeon Digital Network is unlistenable as it is a digitally encrypted trunked network although the lower frequencies you provided for example 468.25 is a Special Events channel which today is being used for the QPS at the Big Day Out not alot of chat but enough to know where they are coming from
FWIW: Frequencies between about 505.0000 and 509.5250 MHz are repeater output frequencies, with the inputs 10 MHz higher eg., 515.000 to 519.5250 MHz.
Also, it would be interesting to know the Brand/Model No. of the radios being used, as there aren't many models that will handle both Tetra and Conventional in the same unit.
--
Comint
- Stretch
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Re: Crime Stoppers
So Comint, seeing as it isn't in the 800 range, are these listenable??
Mitch Rogers
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Re: Crime Stoppers
You can pop in the freqs but it's probably encrypted and you'll only get freqs not TGIDs and you'll miss bits of conversation if it isn't encrypted.
-Alex
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Re: Crime Stoppers
The radios being used are the Motorola MTP850, which is Motorola's most recent TETRA Portable Hand Held two way. It does say that they use the Zeon network, and I remember when I turned them on they would say "Zeon" on the screen with a blue circle. However, a mate of mine who was scanning during schoolies, said he heard me talking around the 505 MHz area, and these were the only radios we used the whole time.Comint wrote:Also, it would be interesting to know the Brand/Model No. of the radios being used, as there aren't many models that will handle both Tetra and Conventional in the same unit.
Charles
ACREM 415 Tango - Gold Coast Division
Mobile / Base - Uniden UH500SX
Handheld - Uniden UH065SX
ACREM 415 Tango - Gold Coast Division
Mobile / Base - Uniden UH500SX
Handheld - Uniden UH065SX
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Re: Crime Stoppers
Stretch wrote:So Comint, seeing as it isn't in the 800 range, are these listenable??
--Comint wrote:. . . However, having said that, it is true that there is currently NO scanner available that will monitor Tetra, encrypted, or otherwise.
Comint
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Re: Crime Stoppers
Well, the plot thickens.415Tango wrote:The radios being used are the Motorola MTP850, which is Motorola's most recent TETRA Portable Hand Held two way. It does say that they use the Zeon network, and I remember when I turned them on they would say "Zeon" on the screen with a blue circle. However, a mate of mine who was scanning during schoolies, said he heard me talking around the 505 MHz area, and these were the only radios we used the whole time.
As far as I can tell, the MTP850 is only capable of operation on one Band, and in this case, as it was on the Motorola Zeon Digital Network, that would be the 800 MHz Band. Also, I can find no mention of it being able to operate as a Conventional analogue radio, so direct operation on QAS, QPS, etc, frequencies is not possible.
TETRA is 4 slot TDMA (Time Division Multiple Access) so monitoring with a conventional scanner would only receive 'raucous noise', and NO intelligible audio, irrespective of whether it is encrypted or un-encrypted, as it is still Digital. Each slot only transmits for 14.167 milliseconds (0.014167 of a second) at a time.
If your mate heard you on 505 Mhz, then the organisers were probably using a Bridge of some kind to link different systems together.
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Comint
Last edited by Comint on Mon Jan 18, 2010 9:35 am, edited 1 time in total.
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Re: Crime Stoppers
Wow. It amazes me how complicated these things are.
How would they have used a bridge to link systems together?
How would they have used a bridge to link systems together?
Charles
ACREM 415 Tango - Gold Coast Division
Mobile / Base - Uniden UH500SX
Handheld - Uniden UH065SX
ACREM 415 Tango - Gold Coast Division
Mobile / Base - Uniden UH500SX
Handheld - Uniden UH065SX
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Re: Crime Stoppers
A Communications Bridge (also known by various other names), is basically some electronics that takes the received audio from one radio and feeds it to one or more other radios, and also has provision for keying the other radios.415Tango wrote:Wow. It amazes me how complicated these things are.
How would they have used a bridge to link systems together?
It can be something as simple as a JPS ACU-M, or as complex as their ACU-1000, or Link-Comm's Tactical Communications Bridge.
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Comint