Batboard

I did do a quick search, but saw no reference to this topic. I plan on modifying a MX suitcase repeater for Astro mode. I intend to add another portable that is cabable of Astro mode to the repeater to cover the Astro form of transmission, then rebroadcast it. Now my Astro portables are capable of Astro mode, is this form of transmission the same as the P25 protocol. Will it pass P25 if it is recovering Astro mode. P25 is kinda new for me, I havn't had to do much as far as repairs to this type of equipment yet. Any help would be appreciated.

Old astro is VSLEP. New astro is P25. Flashcode should say something about IMBE/CAI. I don't remember the exact wording.

From what I understand and have read here, taking demodulated audio out of an astro radio and feeding it into another astro radio to be transmitted is going to sound like total garbage. It just doesn't work nice like it does with analog audio. You need to send the data the receiver into the transmitter. How? I have no idea.

Well my intent is to find where the data is (cleaned up) before it's sent into the vocoder for decoding. I have done similar with DES. I've used Syntor and Syntor-X mobile encoder/decoder box's to make DES repeaters. Also the recovered DATA is sent to the PL or DES modulator section of the transmitter,not the audio section since it is totaly flat in response. Now going by your understanding, shouldn't the recovered data (VSLEP or P25) not care what type it is, when it is being sent to the DES port of the transmitter?

I'm curious, do you actually need p25 radios as a part of a p25 repeater, or can the data just feed through? We have a police repeater in town owned by the college campus, which operates on analog. The city PD uses P25 with that same repeater, and I don't know how.... Its possible they could have upgraded, in which case, it must have a special controller or something, because it is able to put out analog if the input is analog, put out digital if the input is digital....

This may seem like a dumb question, but it seems to me that if you can plug a p25 decoder (AOR makes them) into an analog scanner and decode it into digital, why can't you pass digital through an analog repeater, provided that the recieving radio (on the repeater) does not squelch out the data....?

rileym wrote:I'm curious, do you actually need p25 radios as a part of a p25 repeater, or can the data just feed through? We have a police repeater in town owned by the college campus, which operates on analog. The city PD uses P25 with that same repeater, and I don't know how.... Its possible they could have upgraded, in which case, it must have a special controller or something, because it is able to put out analog if the input is analog, put out digital if the input is digital....

This may seem like a dumb question, but it seems to me that if you can plug a p25 decoder (AOR makes them) into an analog scanner and decode it into digital, why can't you pass digital through an analog repeater, provided that the recieving radio (on the repeater) does not squelch out the data....?

Mixed mode.....no special controler needed on most if not all P25 repeaters. They are backwards compatible......

So it doesent need a special controller, does it need p25 radios to operate, or can it just be any old analog repeater?

A actual P25 repeater is what is really required to do mixed mode, unless someone has put a poor mans repeater together that passes all audio. This has been discussed here several times, you may want to search........

lol, thanks.

Knowing them it is probably a poor man's repeater....

You answered my question.

Are you talking about building a transparent repeater like this?



http://batboard.batlabs.com/viewtopic.php?f=4&t=45645

Chris
N9LLO