Unable to hear LAPD

[chainsawman]

I'm running two airspy R2s with two Bingfu antennas. One is able to pick up LAFD easily, but I get nothing for LAPD which is surprising.
I'm on Vine and Sunset on the 5th floor.

Anyone have any idea why I can't hear anything? I'm pretty sure I tuned to the right frequencies.

 

[Randyk4661]

Are you running DSD+ or other digital decode program?
LAPD is digital, LAFD is analog.

 

[Whiskey3JMC]

You've provided what you have as far as hardware (SDRs & antennae) yet no info on what software you're using to drive the SDRs & decode audio. Also how's your signal strength?

Anyone have any idea why I can't hear anything? I'm pretty sure I tuned to the right frequencies.

Anybody's guess...

 

[chainsawman]

Are you running DSD+ or other digital decode program?
LAPD is digital, LAFD is analog.

I'm running trunk recorder. And thanks, I somehow I didn't catch that LAPD is digital while LAFD is analog.

I thought digital systems all had different pages on RR like the LA-RICS system. As in, you pick a site with a range of frequencies to monitor, program the control channels, and identify the individual talkgroup channels using the decimal value.

When I go to the table for LAPD, it seems like there are individual frequencies I listen for? For example Hollywood is 507.2125 which is the way I thought analog systems worked.

 

[Kingscup]

When I go to the table for LAPD, it seems like there are individual frequencies I listen for? For example Hollywood is 507.2125 which is the way I thought analog systems worked.

LAPD is a conventional P25 system and not a trunked radio system with control channels etc. I would fiddle with the gain settings as that is the most likely cause. You can also download GQRX to help you find the correct settings. Are you setting this up for the Calls platform?