MTR2000 Tx PL help from 4wire

[Vercomm]

Hi Guys,

I'm having some problems with an MTR connected to a TAIT TM8110 with 4 wire module. The problem is this:

I have a kantronics modem connected to the Ext PTT and Aux Audio (flat Tx audio). That part is working okay, when the modem keys the MTR no PL is sent.

But when I route audio into the 4 wire and the Ext PTT goes low no PL is transmitted, which is bad. I need to have PL when audio is going into 4 wire card. I tried using the MRTI PTT and it sort of works, when the TM8110 receives a signal it sends an active low to the MRTI PTT which keys the repeater and with some wildcard programming I was able to get the 4 wire audio working. The part that isn't working is when I remove signal from the TM8110 it sends 4.80volts to the MRTI PTT which should shut down the Tx, but it doesn't.

I've played with the audio settings in the channel information setting and I still can't get it to work right.

This station is equipped with a 4 wire card and Aux I/O card as well.

Any ideas

Thanks,

Jamie

[Vercomm]

HI Guys,

Just to add some more info.

When I remove the wildcard table "MRTI PTT" Action = Key from Wireline Deaction = Dekey from Wireline the MRTI works as it should, low Tx, +5 no Tx.

It seems the Wildcard Action "Key from Wireline" somehow latches the PTT of the MTR. I even tried with local PTT with the same results. I have the audio tab set to route Aux audio with Ext PTT so that the wireline can be controlled by the MRTI PTT. I've set the wireline for 4wire half duplex and even 2 wire, same results.

The MTR I'm working on is from 98 (I think), is there new firmware for the MTR that could help me or does that matter?

I even tried setting the audio tab to route aux audio and wireline audio on EXT PTT. That works, but there is no PL with the Wireline. I tried setting an input so that when the link radio received and keyed the MTR and wireline it would also activate a pin that, through wildcard programming would send PL. But I couldn't get PL to send. It's like the settings in the audio tab would override the setting of the wildcard.

I'm fresh out of ideas, and help or thoughts would be much appreciated!!!

[wavetar]

Normally if you're using the Ext PTT input, you would set the mapping for either Aux TX, which strips the PL, or Wireline, which doesn't. If you set it to "both", the PL is stripped regardless, so newer firmware isn't going to help you, it's just the way it works. I can't help you with the wildcard stuff, as I've never worked with it at all.

What's worked for me in the past in similar set-ups:

Take a tone remote & verify you can key the MTR2000 through the wireline with it & get PL too. Should work no problem. Now, take the audio from the Tait unit & route it through the handset TX audio circuit. This will add the guard tone onto the audio at the output of the remote. Take the COR from the Tait & have it key the remote by applying the low to the PTT of the handset circuit. This should do what you want...of course you'd need to get your hands on a tone remote (or something that can generate the desired guard tone). I found a software package capable of generating it, if that could help you or someone else:

http://www.brothersoft.com/mp3_audio/mi ... 45051.html

Todd

[Vercomm]

Hi Todd,

I figured when I set it to wireline alone and got PL that is was just the nature of the beast. I understand your post about the tone remote now. One question, the Tx audio i'm injecting into the tone remote, is it audio from the 4wire card on the tait or the discriminator audio from the tait?

I am a bit rushed to get this project finished so I'm not sure if I will have time to wait for tone remotes to come in. Alberta's booming economy, go, go, go, now, now, now!!

I would like to find somebody with some first hand experience with wildcard programming. Like I mentioned before, i can set the audio tab to just Aux Audio and have the Local PTT or MRTI PTT control the 4wire audio via wildcard. I'd just need to find out why the MTR seems to latch on a certain state.

Again, thanks for the post todd, if I run into this again I will definately give your solution a try!!

Jamie

[wavetar]

One question, the Tx audio i'm injecting into the tone remote, is it audio from the 4wire card on the tait or the discriminator audio from the tait?

I used the audio from the wireline in my set-up. Either should work, just a matter of how it may sound & levels that may need to be set.

Why not eliminate the wildcard altogether & utilize the front mic jack? Everything you need is there (PTT, tx audio, etc) and you should get your PL.

Todd

[Vercomm]

I guess, why not use the mic port. Do you have a pinout diagram for this mic? Also is there a way to set the deviation by using the MTR mic port? I guess I could just pull my MTR Rx audio from the MTRI port, couldn't i?

Thanks,

Jamie