Hello,
I decided to post to a new thread since this message is about methods and not results. I am planning on doing some testing as I have a HP-1, 396XT, PSR-800, and soon a 536HP. I have several P25 simulcast sites in my area. How can I tell? The signal waveforms from a FM discriminator are different.
The scope function of Unitrunker can be used to determine the type of modulation used by the control channel. I used the HP-1 as an inline signal source with the filter off. The C4FM signal was from a non-simulcast 800 MHz system and the CQPSK signal was from a simulcast 800 MHz system. The CQPSK signal has narrower more defined transitions.
A scanner with a discriminator tap can also be used.
73 Eric
I decided to post to a new thread since this message is about methods and not results. I am planning on doing some testing as I have a HP-1, 396XT, PSR-800, and soon a 536HP. I have several P25 simulcast sites in my area. How can I tell? The signal waveforms from a FM discriminator are different.
The scope function of Unitrunker can be used to determine the type of modulation used by the control channel. I used the HP-1 as an inline signal source with the filter off. The C4FM signal was from a non-simulcast 800 MHz system and the CQPSK signal was from a simulcast 800 MHz system. The CQPSK signal has narrower more defined transitions.
A scanner with a discriminator tap can also be used.
73 Eric