How to link two MTR2000?

[asdfg]

We gotta linked two MTR2000, or one MTR2000 and Micor, to transmitting on same TX frequencies at the same time. How to do that? No phone lines is avaiable.

[wavetar]

You are talking about 'simulcasting' and you will require some sort of linking of the repeaters, be it phone lines/microwave/VOIP/UHF/900MHz link/etc.

This type of system, even a small one, would require some real technical know how to get up & running properly. You'd best hire someone who has the capability to do this.

Todd

[Dan562]

You would need a High Stability Oscillator or HSO connected into each of the individual MTR2000 Base Stations on the 5/10 MHz External Reference Source BNC Input Port for a Simulcast Transmitter configuration.

Since the HSO would be the Reference Frequency Standard, there's a small Tuning adjustment capacitor to align each station on the Carrier Frequency, i.e. examples 157.500000 MHz or 463.225000 +/- Zero Percent Tolerance.

You must also use the same Service Monitor for the Transmit frequency correlation between the two or more stations. Let your Service Monitor warm up for a minimum of 1/2 hour allowing it to stabilize and lock on it's internal HSO standard before setting any frequency in a Simulcast system.

Make sure "if" the stations are using PL on Transmit, Disable the TX PL ENCODE in the station's software before setting the absolute Carrier Frequency on your Service Monitor. Once the Carrier Frequency is set, go back into the station's software and ENABLE TX PL ENCODE.

Dan

[asdfg]

Hi Dan! But we have a 2 MTR2000 in two zones, and receivers zone don't overlapping, and we wont that RX modulation from zone 1 goes on transmition from other MTR2000. We wont something simple without factory's RF links.

[Dan562]

Well, since you don’t have Telco Lines available and you don’t want to purchase RF links from the factory, you’re stuck with the decision to leave the MTR2000 stations just the way they are or do your own research on purchasing two used HT90s, P110s or HT600/P200s portables. And building your own RF Link transceivers system and interfacing them to the rear of each MTR2000 station.

The RF Link transceivers will require their own Power Supplies; +6 to +9 dB Gain Yagi Antennas (PCTel/Maxrad, Antenex & Comtelco, all manufacture these type of antennas). Point the Yagi antenna at the opposite sites, preferably using 3/8” or ½” Andrews Heliax RF Cable and Connectors between the antenna port on the portable transceivers and the Yagi antennas (keeping RF losses at a minimum). Coming out of the MTR2000 Backplace use connector J7 (DB25) to pick off the necessary Audio Input (TX), Audio Output (RX), COR and PTT functions, refer to your /\/\ instruction manual for the pin connections. Depending on which portables you end up purchasing you will need the service manuals for determining where the external connections are located, The HT600/P200 portables can provide the I/O connections through the top of the radio. You may want to look at BatLabs own Equipment For Sale section, to get an idea how much this will cost to build.

Using half duplex links will provide the otherwise poor receive coverage to be useable in both zones and in between. This set up will operate in a configuration based upon the Subscriber units accessing either MTR2000 Base Station / Repeater receiver. Then routing the audio to the in cabinet repeat function and out to the RF Link Tx transceiver across to the RF Link Rx transceiver and into the MTR2000, hard keying that station’s transmitter. It will work the same no matter if the Subscriber is in Zone 1 or Zone 2.

The obvious problem then occurs when both MTR2000 transmitters key up simultaneously considering there are RF over lapping coverage areas to be dealt with. In a situation like this, it appears you’re attempting to do the work with the least amount of expenses on the system or out of your pocket. Then this will be experimental reducing the RF Power Output of each MTR2000 transmitter till there's small over lapping zone to reduce any audio signal hetrodyning or cancellation effect on the Tx Audio Deviation. An alternative would be licensing a second Tx frequency for either repeater, i.e. example:

For VHF

F1 Tx 157.500 MHz F2 Rx 159.100 MHz
F3 Tx 157.300 MHz F2 Rx 159.100 MHz

Or for UHF

F1 Tx 461.350 MHz F2 Rx 466.350 MHz
F3 Tx 461.250 MHz F2 Rx 466.350 Mhz

Then program the Subscriber units for a Non-Priority Scan Function, enabling these units to lock on the strongest signal and prevent jamming or hetrodyning from occurring.

Dan

[asdfg]

Dan, I see that your are a great expert on MTR2000. We have an idea how to make all this using system conector J7, and connecting that connector to assesory connector of GM 300 or Gm 360 radio. One thing is not clear to us, if we take aux TX audio on mtr200 (J7), and we make external PTT ( thru J7), and in same time repeater make his own PTT what will be priority, which transmition go on?

[Dan562]

In the MTR2000 RSS ther's a section for setting up the station's Priority for Tx. I think the factory's programming is set at:

1. TRC Wireline
2. Repeater
3. AUX Tx

In your configuration, you would want the Tx PTT on each station set as follows:

1. AUX Tx Highest Priority
2. Repeater
3. TRC Wireline Lowest Priority

This would allow the RF Link to provide Priority to the other MTR2000. You will be required to experiment with AUX Tx Line for Drop Out Delay, I will suggest to set this for Zero so the Mobile / Portable Subscriber units can access either repeater in between key ups.

Dan

[asdfg]

But for TX priority we don't have AUX TX apriopity, just "wireline, local, repeater".
In "external PTT mapping" in default we have "wireline". and that can be change to "aux audio". Is that mean that wireline priority mean aux. audio priority when we set External PTT mapping as "aux audio"?

[Dan562]

Well, you'll have to excuse my "memory" as I'm doing this strictly from "memory." I do not have access to a MTR2000 Station nor the RSS. What I'm providing you with is, a way to accomplish what you have originally posted. If you wanted the configuration as drop in from the factory, you should have purchase the equipment exactly that way and received instruction manuals with the RF Link products.

In the MTR2000, as in many /\/\ products, they have provided what is considered to be a Help Screen designated as F1 for the programming parameters. If their explanations are not clear enough for anyone using the product, then I would suggest contacting /\/\ itself. BTW, the MTR2000 Product Group is located in Toronto, Canada, their Service Support Group is in Schaumburg and it takes $$$$$$$ while talking to the System Support Center Consultants.

The simplest explanation for Wire Line is either using Telco or
Microwave 2-Wire or 4-Wire circuits configuration from a Remote Console location to Transmit Audio simultaneously with the Tone Remote Control TRC Commands of High Level Guard Tone (HLGT), Function Tone (FT) and Low Level Guard Tone (LLGT) and Receiver’s Recovered Audio. For your configuration, Wire Line would be at the Lowest Priority PTT Level.

Repeater would be the intermediate level. Second Priority PTT Level.

Local means exactly that, as in a hardwire PTT at the MTR2000 station from you RF Link Receiver's Carrier Operated Relay COR (or transistor switch) or any other Auxiliary PTT method and this would be your Highest Priority PTT Level.

When you are mapping the PTT functions, the Transmitter Audio is automatically steered to the programmed Priority wired connections.

BTW, you will need to FCC license your RF Link Frequency Transmitters.

Dan

[asdfg]

Hi Dan, I solve that before I read your reply. On system connector J5, pin C10 I put external PTT, from link radio and aux TX audio routed to wireline. From wireline I take, also, MTR RX modulation to link radio.
PTT priority is working.
Thanx friend.

[shamal jalal]

hiii guys ..It has the same problem.but my reapter mtr3000 and i want linking 2 mtr3000 from port j7 ...I want to linking 2 reapter mtr300 With microwave system E1 analog systeem cuz iam use analog radio ..i have Daigram j7 trunking mtri connector to 1 reapter
1.tx audio 2.ptt 3.spare 4.monitor 5. spare 6.spare 7.rx audio 8.rstat 9.gnd 10.tstat 11.trunk ptt 12.aux 13.trunks tx 14. spare 15.mrti rx 16.gnd 17.gnd
18.gnd 19.gnd 20 spare 21.tx date 22.rx audio 23.trunk mute 24.cci 25.stat

But reapter number 2 On the opposite side how it's going to be?
I had a problem rx or output reapter 2
You will need to activate pin From inside the computer?
please friends Help