chpalmer wrote:
Quote:
Its the 12.5 or 25 khz settings under TX...it has no effect on the RX.
My bet is that the radio has some sort of audio gain that is messing with you. Unfortunately if you set the radio to narrow and you still can hear full deviation from a radio transmitting "wideband", your radio is probably not going to handle someone using an adjacent channel close by very well at all.
Im about to test my NOS Astro Spectra Ive had hanging around to see how well it does and now with what your posting my faith that it will do well has faded a little...
In fact Im going to get my service monitor right now before I install this thing...
Update- The Astro Spectra easily passes my tests... Much better than the CDM its replacing...
It's the DSP. You will enjoy the Astro Spectra. The Astro25 line is even tighter, and the new APX is great. I had and OSP channel set to narrow, and I noticed right away, the RX audio that did pass was not good. As soon as I set it to 25kHz I heard everything again. On another day we had a customer who called about "feedback" on the channel, and it turned out to be another county's IT/radio guy fired up a transmitter 7.5kHz up and was doing a drive test with a 1kHz tone. The APX would not even pick it up on our customer's center freq. The offending signal was -70dBm on the dispatch floor on freq, so it was strong. An older HT1000's (A DN model) set to narrow still picked up the signal. Of course all of the mobiles and the remote RX's were hearing it due to the signal strength.
Jim
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