Spectra with Maxtrac PAC-RT

[matt_tjaden]

I am looking for some help, I have a Spectra VHF A4 and am looking to connect it to a UHF 16pin Maxtrax as a crossband repeater. I have seen where people have linked two maxtracs. Has anyone else tryed this?

Matt Tjaden
KI4IPP

[ke7joi]

I am tring to do more or less the same except I am tring to connect a 900 mhz spectra to a icom 207 vhf/uhf radio so I can used my 900 radio as an extender for my long rang comms maybe we can work together on this.

Joel McFarlane
KE7JOI

[matt_tjaden]

I have premade plugs for the plug in the back of the spectra. It looks like what is needed on the spectra is there. I also have some plugs and pins for the maxtrac. What I am unshure of is how to interface the two.

[ke7joi]

the biggest problem you are going to have is getting the spectra to key the transmitter in the maxtac when the a signal is heard on the spectras
receiver that is the current problem I am having. The spectra has what is called raw detected audio that is the audio just off the detector through a buffer to a option connector on the back of the transcever from here I need to construct a pl code and squelch detector curcuit this would give me a cor output to act as key output for the 207H. I am still looking for a curcuit to do this that is my current problem.

[matt_tjaden]

Dose the audio from the control head get buffered? If so we might be able to tap it from there.

[ke7joi]

there is no audio in the control head that I know of. The raw detected audio is on the accessory connector on the back of the spectra. It occured to me for my use all i needed was a pl tone detector that could key the other transmitter the raw audio could be fed to the mic input on the other radio

I found a tone board here
http://www.piexx.com/index.php?main_pag ... ucts_id=47[/img]

[ai4ui]

[quote="ke7joi"] The spectra has what is called raw detected audio that is the audio just off the detector through a buffer to a option connector on the back of the transcever from here I need to construct a pl code and squelch detector curcuit this would give me a cor output to act as key output for the 207H. I am still looking for a curcuit to do this that is my current problem.[/quote]

On the audio board look at Audio PA IC (TDA 7256) pin 10. This is the audio enable, turns the audio amp on and off based on the recept of a signal and follows your PL/Signalling unmute rules.

This pin goes low for received signal to enable the audio PA. I wouldn't recommend using that to key a radio, but it would be suitable to close a low current relay that would key a radio, or a PNP transistor.

The only real problem is that any audio (vol. up/down & key press tones) will enable the audio PA.

[ke7joi]

you could make it not transmit the beeps from the control by anding that signal with the busy indicator so you would have to break sql and have audio also