New York systems?

DaveNF2G · #1 (**permalink**) 03-24-2001, 08:56 AM

Someone suggested that there are MPT-1327 systems in use somewhere in New York but declined to offer any details.

Is anyone aware of these? Also, can someone describe what MPT-1327 sounds like? I hear some systems that I've been told by radio techs are ESAS, but that sound has been described as MPT-1327 by other sources? Anybody know for sure?

Thanks.

Anonymous · #2 (**permalink**) 03-25-2001, 06:40 AM

Quote:

<font face="Verdana, Arial" size="2">Originally posted by Dave, NF2G:
Someone suggested that there are MPT-1327 systems in use somewhere in New York but declined to offer any details.

Is anyone aware of these? Also, can someone describe what MPT-1327 sounds like? I hear some systems that I've been told by radio techs are ESAS, but that sound has been described as MPT-1327 by other sources? Anybody know for sure?

Thanks.</font>

Anonymous · #3 (**permalink**) 03-25-2001, 06:53 AM

Hi Dave
I am an amateur and had 8 years of involvement in the mpt1327 systems hear in Soputh Africa.Well the data on the Control Channel (CC) is continuous 1200 ffsk.Being analog you should hear this quite easy .If you listen off-air you should hear a repetition of the data and every now and then you should hear chirps of different nature.This data on the control channel is 100% duty cycle.On the traffic channels every time a radio user keys and de-keys you should hear a burst of ffsk 1200 data.When a mobile clears a call there is normally a long clear-down data message+- 1.5 seconds.

Feel free to email me if you have any further questions.MPT 1327 is , I think, pretty new to the USA but is really well used in Asia South Africa and many many other leading developing countries.We in South Africa have three public trunking systems: Q-Trunk Fleetcall One2One.
The national coverage is pretty good and we use the 250-270Mhz band.There are a few smaller utility companies that are also using MPT1327 for there needs.Where cost and service demands are in mind there is few open architechtures that offer this trunking requirement.
Regards 73
Bradley Glen ZS5WT

Arif Sultan · #4 (**permalink**) 05-22-2001, 03:47 AM

Hi Bradley,

I am Arif from Pakistan. I want to use MPT1343 terminal equipment on MPT1327 TSC what should i do??
Thanks for any help.

Arif

Quote:

<font face="Verdana, Arial" size="2">Originally posted by Bradley ZS5WT:
Hi Dave
I am an amateur and had 8 years of involvement in the mpt1327 systems hear in Soputh Africa.Well the data on the Control Channel (CC) is continuous 1200 ffsk.Being analog you should hear this quite easy .If you listen off-air you should hear a repetition of the data and every now and then you should hear chirps of different nature.This data on the control channel is 100% duty cycle.On the traffic channels every time a radio user keys and de-keys you should hear a burst of ffsk 1200 data.When a mobile clears a call there is normally a long clear-down data message+- 1.5 seconds.

Feel free to email me if you have any further questions.MPT 1327 is , I think, pretty new to the USA but is really well used in Asia South Africa and many many other leading developing countries.We in South Africa have three public trunking systems: Q-Trunk Fleetcall One2One.
The national coverage is pretty good and we use the 250-270Mhz band.There are a few smaller utility companies that are also using MPT1327 for there needs.Where cost and service demands are in mind there is few open architechtures that offer this trunking requirement.
Regards 73
Bradley Glen ZS5WT</font>

DaveH · #5 (**permalink**) 06-12-2001, 09:52 PM

Anywhere near the NYS/Ontario border, you can pick up a large 450MHz system spread over
the eastern part of the province. The eastern limits would be Cornwall/Massena; west limits
somewhere around Kingston/Watertown.

The control channels are continuous data at 1200 baud. Mobile transmissions have a short data burst after each PTT drop.

Dave

Dave

bradlington · #6 (**permalink**) 04-09-2004, 03:16 PM

Hi Arif

You should find out from the Network provider if your equipment is compatible.

Every network that I have come accross has slight variations of the many different parameters so as to tweak it for their specific needs.

Regards

Brad

Unitrunker · #7 (**permalink**) 04-09-2004, 05:35 PM

Quote:

Originally Posted by DaveNF2G

Also, can someone describe what MPT-1327 sounds like?

It's noisy ... but you hear for yourself. I can send you a WAV file someone sent to me for software decode testing.

-rick

bradlington · #8 (**permalink**) 04-10-2004, 05:43 AM

Sure send me what you have and I will in turn record the control channel and give you the channel and frequency so as to test your software.

I will , if I remember , to record direct pressel on and off messages.

regards

Brad

morfis · #9 (**permalink**) 04-10-2004, 05:51 AM

Or check the sample audio on:

http://www.kb9ukd.com/digital/

bradlington · #10 (**permalink**) 04-10-2004, 06:03 AM

morfis · #11 (**permalink**) 04-10-2004, 06:15 AM

The channel numbers shown appear decimal (as are the radio IDs in tronkito/vbtrunk). The SysID is hex

bradlington · #12 (**permalink**) 04-10-2004, 06:24 AM

Correct- Most systems work around a start frequency known as the base.

Working at the given channel spacing of the system one will get the frequency given to you by the program.

If the start (base) is 420,0000 Mhz and the channel spacing is 12,5 khz then if the syatem says GTC (Go To Channel ) decimal ch 2 then it would be two times the channel spacing up from the base.

Eg:420,0000 =ch 1
420,0125 =ch2
420,0125 = ch3

and so on .

It is the decoding program that is converting the given hex to a decimal value for you to read.

Some very old programs I used years ago gave me the raw hex values and we had to work it out from there-very time consuming.

Regards

Brad

morfis · #13 (**permalink**) 04-10-2004, 06:31 AM

Quote:

Originally Posted by bradlington

Some very old programs I used years ago gave me the raw hex values and we had to work it out from there-very time consuming.

Regards

Brad

Like trunker - lol

I never thought it was too hard converting hex to decimal to get the real freqs.

I wonder who "4025" is...not a sysid that I've logged from this part of the UK

jsharp2316 · #14 (**permalink**) 06-07-2004, 06:22 PM

[quote="DaveNF2G"]Someone suggested that there are MPT-1327 systems in use somewhere in New York but declined to offer any details.

Is anyone aware of these? Also, can someone describe what MPT-1327 sounds like? I hear some systems that I've been told by radio techs are ESAS, but that sound has been described as MPT-1327 by other sources? Anybody know for sure?

That sounds just like Bell 212 modem standard----that sounds like a diesel truck idling. I've built a dozen systems.

DaveNF2G · #15 (**permalink**) 06-07-2004, 06:51 PM

Since posting that question, I've learned that JPJ Electronics in the Utica/Rome area operates an MPT-1327 system on UHF.

DaveH · #16 (**permalink**) 07-10-2004, 07:51 PM

Dave,

I realize what you asked about is NYS systems but just thought to mention a Quinte Communications system around Belleville Ontario that you might hear during enhanced propogation. I believe you are roughly the same distance from it as me as well as "inland". Control channels have been heard on 422.2625 and 422.4625, and previously on 422.6500 (another system). The System ID is 0x3c11.

Dave

DaveNF2G · #17 (**permalink**) 07-11-2004, 12:58 PM

Quote:

Originally Posted by DaveH

Dave,

I realize what you asked about is NYS systems but just thought to mention a Quinte Communications system around Belleville Ontario that you might hear during enhanced propogation. I believe you are roughly the same distance from it as me as well as "inland". Control channels have been heard on 422.2625 and 422.4625, and previously on 422.6500 (another system). The System ID is 0x3c11.

Dave

Thanks for the tip. I'll be alert to that one if it pops up.

73 de Dave, NF2G