m1geo
Member
Hello all.
New to working with Kenwood PMRs. I'm trying to setup something very simple, and wondered (a) if it could be done, and (b) how to do it. Fairly sure it can be done.
I want to transceive 9600 baud data. I need the audio to be as flat as possible and the minimum phase distortion on both TX and RX, so the data as the best chance of recovery and thus BER.
On the back of the PMR, there is a 25-way D connector. I assume that I can use that. A little looking int the programming software reveals that I can select DI (i guess that's for data in, or maybe MI2) and also External PTT (Data) (or maybe Data PTT). I guess they're all programmable so just set to match? I basically want to go directly to the VCO, no processing, as this is all done externally by the data modem. I guess STE=squelch tail eliminator, and QT/DQT are CTCSS or similar? How to I turn off TX audio shaping, or is this done when I use a data input?
On the receive side, I am a little more lost. I want to do the same thing, basically; Get a signal out of the radio that is directly from the discriminator, without audio shaping and deemphasis, etc. Again, the phase distortion and audio bandpass flatness are paramount. I need this to be open-squelch, but I guess if it's discriminator audio, it probably will be output before the squelch circuitry.
Sorry for the long (first) post, and hopefully someone can guide me in the right direction.
George
M1GEO
New to working with Kenwood PMRs. I'm trying to setup something very simple, and wondered (a) if it could be done, and (b) how to do it. Fairly sure it can be done.
I want to transceive 9600 baud data. I need the audio to be as flat as possible and the minimum phase distortion on both TX and RX, so the data as the best chance of recovery and thus BER.
On the back of the PMR, there is a 25-way D connector. I assume that I can use that. A little looking int the programming software reveals that I can select DI (i guess that's for data in, or maybe MI2) and also External PTT (Data) (or maybe Data PTT). I guess they're all programmable so just set to match? I basically want to go directly to the VCO, no processing, as this is all done externally by the data modem. I guess STE=squelch tail eliminator, and QT/DQT are CTCSS or similar? How to I turn off TX audio shaping, or is this done when I use a data input?
On the receive side, I am a little more lost. I want to do the same thing, basically; Get a signal out of the radio that is directly from the discriminator, without audio shaping and deemphasis, etc. Again, the phase distortion and audio bandpass flatness are paramount. I need this to be open-squelch, but I guess if it's discriminator audio, it probably will be output before the squelch circuitry.
Sorry for the long (first) post, and hopefully someone can guide me in the right direction.
George
M1GEO