Re: 32ch RX system
So 32 transmitters and 32 receivers, in a 1-1 relationship (one transmitter talking to one receiver) in a system, with 800 kHz band (32 * 25 kHz).
Now, you need to figure out a couple of things. First, you need to determine the baseband SNR that you need to decode a transmission. I'm not sure how you are going to determine this, part of this may come from the vendor of the chipset you are using. Failing that, look at some intro communications theory books and figure out, from the modulation type (FM/PM/QPSK/etc) what the SNR you need is.
Once you have this, you can determine the receiver minimum signal you can receiver
Receiver SNR, assume 4 dB Receiver Noise figure, gives you minimum receive power, back that out through the antenna gain, assume an urban path loss, and you can get how far you can transmit and receive.
Next, you can assume that you have a receiver, as far away from it's transmitter as you can get (Minimum input power), on channel N, and it's next to the transmitter on channel N+1. From the difference in powers, you can start determining the filter requirements for the receiver.
This is a fair amount of work, can you get something off the shelf to do this?
Dave
www.keystoneradio.com