Delay in transmission on pro-96

[nashscan]

I apologize if this issue has been addressed previously, but when I listen to the Brentwood TN police dept., the scanner does not pick up the first two seconds or so of an officer's transmission. If the dispatch transmits first, I hear the whole thing. The frequency is a standard analog 452.775. Any ideas why this anomoly occurs?

 

[Voyager]

I apologize if this issue has been addressed previously, but when I listen to the Brentwood TN police dept., the scanner does not pick up the first two seconds or so of an officer's transmission. If the dispatch transmits first, I hear the whole thing. The frequency is a standard analog 452.775. Any ideas why this anomoly occurs?

Do you have CTCSS or CDCSS decoding on the channel?

I'm assuming it's a repeater. Maybe it takes that long for the repeater to come up (or decode if the answer to the above is yes).

Do you pick it up OK on other scanners?

Joe M.

 

[nashscan]

Joe, I'm really not sure if it's a repeater. I never had this problem on my old Radio Shack scanner, which was an old Pro-something back in the early 90's.

 

[Voyager]

Joe, I'm really not sure if it's a repeater. I never had this problem on my old Radio Shack scanner, which was an old Pro-something back in the early 90's.

Are you sure the true frequency is 452.xxx? A police frequency should be in the 453 MHz range. Maybe you are hearing an image of the true frequency. However, can you answer the questions I asked before? Your old scanner most likely did not even have CTCSS/CDCSS capabilities.

Just about all UHF frequencies are repeaters. Do you hear a tail? That's a length of dead signal after the person stops talking. Or, perhaps a double squelch tail? That's two noise bursts after they stop talking.

Joe M.

 

[nashscan]

Joe, I'm really not sure if it's a repeater. I never had this problem on my old Radio Shack scanner, which was an old Pro-something back in the early 90's.

Are you sure the true frequency is 452.xxx? A police frequency should be in the 453 MHz range. Maybe you are hearing an image of the true frequency. However, can you answer the questions I asked before? Your old scanner most likely did not even have CTCSS/CDCSS capabilities.

Just about all UHF frequencies are repeaters. Do you hear a tail? That's a length of dead signal after the person stops talking. Or, perhaps a double squelch tail? That's two noise bursts after they stop talking.

Joe M.

Thanks for replying Joe. The frequency is definately 452.775. I also noticed this was unusual, however they tried 800 Mhz and reverted back to an old city frequency. I don't know the whole story, but that is the main signal. My old scanner did not have anything CTCSS, etc. I'm not exactly sure what that is, but I am exactly sure that was not a feature.

As far as the 'tail', when the officer completes a transmission, you hear several little tones of varying pitches that play for a second, and then static for a split second. I'm not sure if that's what you are referring to or not.

An interesting side note, and I'm not sure if this has anything to do with it or not, but if I travel just two or three miles outside of the suburb, the trasmissions get staticy. But if the officers have to transport a prisoner 20 miles away or whatever (and I am still right in the city), I can still hear them talking to the dispatchers as clear as a bell.

 

[INDY72]

The tones and slight static sound is the "tail". As to your going mobile and not recieving good, it could be the antenna your using. As to them being heard for a distance, the repeater is a powerful radio using anywhere from 50 or so watts, to 100 watts and generally can recieve, and transmit at ranges up to 30 or more miles depending on exact output power, tower hieght, etc.

 

[fmon]

This data is pulled from FCC search:

Location:
BRENTWOOD, CITY OF KNEF390 Active TN BRENTWOOD WILLIAMSON PW Mobile

Location: ROBERT E LEE DR NEAR CITY WATER TANK
BRENTWOOD, CITY OF KNEF390 Active TN BRENTWOOD WILLIAMSON PW Mobile Relay 115

FCC and RR both list 457.775 as input for the licence, thus 452.775 is a repeater output.

 

[scanfan03]

Do you have the scanner on manual when it does this?

If it is then that means the scanner is on it's power saver mode and it turns off every 5 seconds or something like that and then turns back on, if something talks while it is "off" then it won't come talk until about a second later when it comes back "on", that's the way the scanner is supposed to function (to save your batteries). Your older scanner most likely didn't have this feature.

 

[nashscan]

Do you have the scanner on manual when it does this?

If it is then that means the scanner is on it's power saver mode and it turns off every 5 seconds or something like that and then turns back on, if something talks while it is "off" then it won't come talk until about a second later when it comes back "on", that's the way the scanner is supposed to function (to save your batteries). Your older scanner most likely didn't have this feature.

That must be it! It is in fact on manual with batteries powering it when I am in my car listening to that channel. Thanks for your help.

 

[DonS]

The "manual mode / battery save" feature is described on page 50 of the manual (the PDF version I downloaded from RS support).

It also describes a way to circumvent that feature - after manually selecting the channel you want to monitor, press the PGM key.