On 12 Nov 2005 05:57:54 -0800, "BIGSteve"
said in rec.radio.scanner:

is there anyway to recieve the trunk system on a pro 2040?

You can receive the channels - just program them in. (Don't program
Motorola control channels unless you like listening to digital noise -
that's all you'll hear on those channels.)

But the scanner won't follow a particular talkgroup - you'll just hear
whatever is on whichever channel it stops on.

You can tap the discriminator at pin 9 of the discriminator chip,
IC-2, a MC3361BP. Then you can run a tracker program and control a
computer-controllable scanner to track trunked systems.

what is a descriminator?

The stage in the receiver that converts the frequency changes (FM)
into audio.

and are there any mods at all for this scanner?

Probably mods to unblock the 800 MHz cellphone range but, since analog
cellphone usage is pretty sparse, and you can't decode digital
cellphone signals (not aren't allowed to - you can't), those mods are
pretty useless.