ScanRiverside.com

Mike, I thought a patch was like a simulcast. Let me explain what a patch is... In a dispatch console, it's programmed with numerous "resources". These resources can be talk groups on one or more trunked systems, or they can be conventional radios, connected via wireline or microwave back...

There are a couple of things people should take from this incident... First, LAPD was operating inside Corona and Riverside County without any prior coordination. They were not in communication with anyone outside their own agency, and that was by cellphone. Second, Riverside County has an extensive...

DIINGDANGIT! I think I figured it out...maybe... It's as good a theory as any, and it's going to end up being something complex like that. One of the main reasons for building a triple conversion receiver in the first place is for image rejection, but no superhet receiver will be 100% image free. I...

To critique zz0468's analysis, on the other hand, you're guess that the 380MHz IF is only at play in "the higher bands" is incorrect; I am attaching a valuable document concerning how the IF conversion stages work in current GRE receivers that you can look at. LOL... this thread is defini...

Someone asked about what radio I'm hearing this on. I'm using a Pro-97 with a roof mounted antenna, and I'm in Riverside. Never thought to check and see if I pick this signal up on a rubber duck antenna, or one of my other scanners. The PRO-97 has a 2nd IF of 21.4 MHz, not 10.7. I think the first I...

Even some common frequencies go to birdies from what I"ve seen. Once channel 155.34 (HEAR) was a birdie. Since birdies are an artifact of a specific receiver design, a frequency that has a birdie in one receiver won't necessarily have a birdie in any other type of receiver. That's also why man...

Not knowing whether he has a single or dual stage mixer, it's hard to tell. I don't think his receiver is dividing down to land at 417.800 by design, but it's a harmonic image. It would be interesting to see what the exact LO chain and mixing scheme is being used. I just tried to look up the IF fre...

I was going to suggest birdie or bleeding over. A "birdie" is a spurious response generated and received by the receiver itself. With complex local oscillator injection schemes, and multiple IF stages, it becomes possible for a signal generated in the radio for one purpose to leak into an...

Maybe just having a hard time broadcasting a mouthful of information on the air. It is public safety radio after all. No, seriously. It's so the person receiving the dispatch has time to write what's being said. A possible second reason would be that dispatchers are extreme multi-taskers, and if th...

cvrules90 wrote:...I remember on the EDACS network the dispatcher would also say a sentence followed by break... possibly to make sure unauthorized listeners would turn their radios off.

The break was to give the guy on the receiving end time to catch up with his note taking.