| Author |
Message |
    
Boxcar
| | Posted on Tuesday, December 09, 2003 - 8:59 pm: | 
|
I was just curious if this was a possibility in posting scanner or shortwave questions from our registered users. I have one concerning a radio shack(pro-2045) that I wondered if there was anyway in eliminating those annoying chirps in between the police band. Is this a simple mod or not. Thanks and appreciate any info provided. |
Tech808
| | Posted on Tuesday, December 09, 2003 - 9:11 pm: |
|
Boxcar,
If you don't get any answer's here you might post in the "Product Reviews" Area under "Scanners".
There are a lot of Forum Member's who never read the Open Section.
Hope this help's
Lon
Tech808 |
Crafter
| | Posted on Wednesday, December 10, 2003 - 12:50 am: |
|
Ok only thing I can find is a discriminator Mod, Sorry. Box car I'll keep looking though. |
Bruce
| | Posted on Wednesday, December 10, 2003 - 4:29 am: |
|
Boxcar what is a chirps? do you have some frequencys? |
Barracuda
| | Posted on Thursday, December 11, 2003 - 4:56 pm: |
|
BoxCar,
I have a RS Pro-93 scanner that is very similar to yours. I think you might be hearing the data bursts that the agency's digital radios emit for id, etc.
Just a thought
Barracuda |
Crafter
| | Posted on Thursday, December 11, 2003 - 7:24 pm: |
|
I have looked far and wide boxcar and cant find anything dealing with the chirp. |
rattlesnakejake
| | Posted on Thursday, December 11, 2003 - 7:44 pm: |
|
it could be the noise from the repeater. In that case, its unfixable. |
Boxcar
| | Posted on Thursday, December 11, 2003 - 8:02 pm: |
|
Bruce, it's like about 4-5 chirps or beeps when someone on the police band lets off the key when they're finished talking and then it goes silent until the next key up. I've heard this on other scanners too. I've even heard some locals on the cb frequency transmitting their own scanner at times but have heard no beeps. I'm not sure but I've heard of adding a G-whiz kit from someone years ago but never did any searching on that. Thanks for looking crafter! Appreciate it!!!! The scanner I have is actually a pretty nice one compared to others I've owned. It has the ctcss board on it. Thanks for the help guys!! |
Ss8541
| | Posted on Friday, December 12, 2003 - 12:00 am: |
|
boxcar,
what you are talking about is basically caller ID for 2-way radio. it is one of these formats; 5 tone encode, dtmf encode, MDC 1200, or a few others.
we use 5 tone encode. it can be used with the icoms as ANI(automatic number identification, aka caller id). these quick tone/digital bursts('chirps') are decoded on the rxing end to show a number. this # lets everyone else know what radio was keyed. it can be txed at the beginning of the transmission, end of the transmission, or both.
you can also use it to kill(disable tx and rx) a radio that has been stolen, open the mic on a radio of a 'downed officer' so everyone can hear what is happening. the dispatcher can even make a radio 'answer back'. this is for an officer that is not answering his radio when called repeatedly, they'll know with this that his radio is in range, and that he just isn't paying attention.
we also use it for electrical companies. each truck is issued a certain # that is programmed into that radio. if the dispatcher calls that truck a few times and gets no answer, they send it a 5 tone encode that is specifically for that truck. once the truck decodes this 5 tone signal, it will blow the horn(output port on back of radio for this function) and flash 'CALL' on the screen. it will do this every xx(programmed length) seconds until someone answers the radio. this way the guys will get/hear their calls while away from the truck. we sometimes put a switch in the 'horn' line so that they can turn it on/off, but the screen will alway flash 'CALL'.
anyway, this was just a little primer on what he is most likely hearing. as for a fix for it, the only one i know is a 2 step procedure. 1) turn scanner off, 2) leave it that way. |
Cm4257
| | Posted on Friday, December 12, 2003 - 2:37 am: |
|
I think the chirps he is talking about are the chirps that the erricson trunked system emits after one of the units unkeys and they are there to keep some what of privicy to the system. after one of the units unkeys there are a 3 or 4 beeps or chirps when this happens the your scanner is locked on that freq wile the system has jumped to another freq to finish the transmision un like the motorola system that follows what ever that control freq tells the scanner to hop to. the beeps or chirps are there to hold up your scanner wile the conversation continues on another Freq. no mod that i know of to solve this. |
Ss8541
| | Posted on Friday, December 12, 2003 - 9:41 am: |
|
cm4257,
this would explain what he is hearing under some circumstances, but he says that after the beeps it goes quiet until the next key up. i took this as if it is not missing part of the conversation(as would happen with the ericson system), since he didn't say so, but i could -ASS-uming too much here. maybe boxcar can clear this up for us.
if it -is- missing some of the conversation, i'd go with what you have posted, if not i'd think it is some type of signaling format like the ones i mentioned above. |
Boxcar
| | Posted on Friday, December 12, 2003 - 5:39 pm: |
|
I believe it is the trunking system but my scanner doesn't have that. I hear conversations end but when they answer it's something totally different like the frequencies are jumped around a little. I've heard the trunked scanners are a good thing to use if you monitor police but it's just annoying hearing these beeps everytime they unkey their mic's. No biggie though. I usually listen to the storm chasers. I appreciate all the info provided on this. Only reason why I brought up the g-whiz kit issue is because I've heard you can put these in your scanner to eliminate the beeps but wasn't for sure if I was remembering this right. Have you guys heard of this before? |
Bigbob
| | Posted on Friday, December 12, 2003 - 10:24 pm: |
|
Aw darn an I thought you guys were gonna be talkin about scanners for printing. |
Bruce
| | Posted on Saturday, December 13, 2003 - 2:45 pm: |
|
in todays scanning world nothing less than a dual tracker is worth buying unless your the rare person who has no trunking systems around you |
|
