*New* LAPD - Wilshire Division Live Audio Feed

[jewie27]

Your previous answer has been changed? It's not the ghetto bird?

That is not "static"!! This is UHF FM using APCO digitized audio, and if your receiving system was set up correctly, IMHO we wouldn't be hearing that garbage - your receiver would decode that so-called static, or the squelch would ignore it.

That static is a signal, simplex or otherwise, that is NOT being decoded properly. I'm sorry if this reality is raining on your delusion.

Simplex is limited by distance since it doesnt use a repeater, it's radio to radio. Thats why there is static sometimes. Fyi

 

[LAflyer]

Simplex is limited by distance since it doesnt use a repeater, it's radio to radio. Thats why there is static sometimes. Fyi

Actually no -- What is being called "simplex" in LAPD parlance are really repeater channel pairs (just look in the RR db). They are not wide area coverage, however are repeaters never the less that cover the local station area certainly and most cases the division and sometimes even beyond depending in propagation.

 

[KMA367]

Actually no -- What is being called "simplex" in LAPD parlance are really repeater channel pairs (just look in the RR db). They are not wide area coverage, however are repeaters never the less that cover the local station area certainly and most cases the division and sometimes even beyond depending in propagation.

And on the so-called division "simplex" channels (as well as the bureau and citywide tacs), the officers have the option of using them in either "true" simplex mode (direct unit-to-unit) or thru the repeater. The Div "simplex" repeaters in all divisions are located at the station, thus making them less robust than the bureau and citywide tacs, whose repeaters are on hilltops and tall buildings around the city.

Often you'll hear only one side of a conversation on any of those frequencies, which tells you that one officer is probably using the repeater and the other is going direct. Since they're both listening to the downlink side (lower freq of the pair) either way, as long as they can hear each other it works for them and they don't worry about it.

 

[jewie27]

And on the so-called division "simplex" channels (as well as the bureau and citywide tacs), the officers have the option of using them in either "true" simplex mode (direct unit-to-unit) or thru the repeater. The Div "simplex" repeaters in all divisions are located at the station, thus making them less robust than the bureau and citywide tacs, whose repeaters are on hilltops and tall buildings around the city.

Often you'll hear only one side of a conversation on any of those frequencies, which tells you that one officer is probably using the repeater and the other is going direct. Since they're both listening to the downlink side (lower freq of the pair) either way, as long as they can hear each other it works for them and they don't worry about it.

are there frequencies for both? I only see one simplex for each division.

 

[mule1075]

deleted

 

[jewie27]

Lapd runs an apco 25 system, I'm using an outdoor discone antenna and uniden digital scanner with the latest updates and it sounds fine. It's not getting any better unless a 396xt will make a difference. 2 days after that troll started complaining without making suggestions, still sounds fine to me. No need to be rude
and if you cant hear the audio clearly then it's your internet connection. Ive listened through my laptop wirelessly on cable internet and through my 3g cellphone network. Check your equipment before you rag on mine.

I have no interest in chicago pd, LA sets the standard in law enforcement.

 

[mule1075]

i deleted my previous post you have no complaints from me i think your feed sounds great.i do not quite know how i came of being rude nor was i ragging on your equipment.anyway keep up the great work i enjoy sitting back in the recliner and listening in from time to time.

 

[jewie27]

i deleted my previous post you have no complaints from me i think your feed sounds great.i do not quite know how i came of being rude nor was i ragging on your equipment.anyway keep up the great work i enjoy sitting back in the recliner and listening in from time to time.

No it wasn't you, don't worry.

 

[KMA367]

are there frequencies for both? I only see one simplex for each division.

With a couple irrelevant exceptions, each LAPD frequency is actually a PAIR of frequencies, the "uplink" frequency where the mobile units generally transmit, and the "downlink" frequency where you hear the dispatcher - or the unit if they're using the repeater.

For instance, Wilshire's dispatch frequency is 506.9625, but when the officers transmit they are actually talking on 509.9625, but it is repeated from a hilltop site on the downlink (506.9625) side so the other units can hear them. That's unless there's an RTO transmitting, which block's out the mobile's message from being heard

On the car-to-car frequencies, including the Div "simplex" channels (their real name is "Enhanced Fallback), it's almost the same. Using "Wilshire simplex" as an example, for better range they will go through the repeater which transmits on 484.550, but the officer is actually talking on 487.550. Everyone listens to the 484.550 side. However, if the units are close to each other, say less than a mile, they can bypass or "talk around" the repeater by transmitting directly on 484.550.

Gosh I hope that's what you're asking, and that it makes sense. But at 2:00 am at the end of a very long day, I dunno... I'll probably look at this in the morning and wonder why I made it so convoluted.

 

[jewie27]

With a couple irrelevant exceptions, each LAPD frequency is actually a PAIR of frequencies, the "uplink" frequency where the mobile units generally transmit, and the "downlink" frequency where you hear the dispatcher - or the unit if they're using the repeater.

For instance, Wilshire's dispatch frequency is 506.9625, but when the officers transmit they are actually talking on 509.9625, but it is repeated from a hilltop site on the downlink (506.9625) side so the other units can hear them. That's unless there's an RTO transmitting, which block's out the mobile's message from being heard

On the car-to-car frequencies, including the Div "simplex" channels (their real name is "Enhanced Fallback), it's almost the same. Using "Wilshire simplex" as an example, for better range they will go through the repeater which transmits on 484.550, but the officer is actually talking on 487.550. Everyone listens to the 484.550 side. However, if the units are close to each other, say less than a mile, they can bypass or "talk around" the repeater by transmitting directly on 484.550.

Gosh I hope that's what you're asking, and that it makes sense. But at 2:00 am at the end of a very long day, I dunno... I'll probably look at this in the morning and wonder why I made it so convoluted.

Thanks I appreciate your feedback.

 

[InspectahDeck718]

The volume is extremely low & the droning background noise is killing me!! Also, could you by chance set up a feed for SE, SW and/or 77th Divisions? Thanks!

 

[jewie27]

The volume is extremely low & the droning background noise is killing me!! Also, could you by chance set up a feed for SE, SW and/or 77th Divisions? Thanks!

I just ordered a new audio jack, the scanner is 4 years old and it's b/o.

 

[jewie27]

code 4, new inline stereo cable installed. back online.

 

[jewie27]

SIMPLEX is the only channel with static. How do I know? Everytime the scanner stops on simplex and no one is talking, there is static. Base frequencies have no problems. It's not my equipment.

 

[Radio_Lady]

SIMPLEX is the only channel with static. How do I know? Everytime the scanner stops on simplex and no one is talking, there is static. Base frequencies have no problems. It's not my equipment.

The "static" on Wilshire simplex, 484.550, could be from any or all of several sources:

1. An artifact of that specific frequency and your scanner's circuitry. Most scanners are simply prone to noise on various frequencies, either internally or from nearby RF sources or both. Although they've improved significantly over the years, few if any are a match for a professional-grade radio.
   
   
2. Someone is transmitting on actual simplex and there's not a strong enough digital signal for your scanner's vocoder to decode
   
   
3. 484.550 is immediately between (12.5 kHz from each) two relatively powerful citywide frequencies which have six higher-elevation repeaters authorized for up to 155 watts ERP, while the "Div Simplex" repeater at Wilshire Station is authorized for a maximum of 60 watts. Unless you're getting a strong, solid signal on the Wilshire frequency, most scanners aren't selective enough to differentiate it from a stronger signal on either or both adjacent frequencies.
   
   In addition, the Wilshire Station Fallback repeater's antenna is at an elevation of only 129 feet, while the other frequencies' repeaters are at 220, 928, 1450, 1690, 2975, and 5075 feet.

I would say all three of those are likely suspects, and there may be others. Adjusting the squelch might help if it's #2, but otherwise you probably have to either live with it or lock it out.

Your scanner, your feed, your call.

 

[jewie27]

The "static" on Wilshire simplex, 484.550, could be from any or all of several sources:

1. An artifact of that specific frequency and your scanner's circuitry. Most scanners are simply prone to noise on various frequencies, either internally or from nearby RF sources or both. Although they've improved significantly over the years, few if any are a match for a professional-grade radio.
   
   
2. Someone is transmitting on actual simplex and there's not a strong enough digital signal for your scanner's vocoder to decode
   
   
3. 484.550 is immediately between (12.5 kHz from each) two relatively powerful citywide frequencies which have six higher-elevation repeaters authorized for up to 155 watts ERP, while the "Div Simplex" repeater at Wilshire Station is authorized for a maximum of 60 watts. Unless you're getting a strong, solid signal on the Wilshire frequency, most scanners aren't selective enough to differentiate it from a stronger signal on either or both adjacent frequencies.
   
   In addition, the Wilshire Station Fallback repeater's antenna is at an elevation of only 129 feet, while the other frequencies' repeaters are at 220, 928, 1450, 1690, 2975, and 5075 feet.

I would say all three of those are likely suspects, and there may be others. Adjusting the squelch might help if it's #2, but otherwise you probably have to either live with it or lock it out.

Your scanner, your feed, your call.

Thanks for the insight. Since I'm using an outdoor antenna and can't move it any more to get better reception, the only thing I can try is adjust the squelch. Is simplex digital or analog? My squelch is for analog.

 

[inigo88]

Does your scanner have the capability to do P25 NAC codes? If so, set it up for the proper NAC for Wilshire's simplex channel from the DB. If not no big deal, just try to set the squelch a little tighter or possibly turn on the attenuator on that channel (but not the others).

 

[jewie27]

Does your scanner have the capability to do P25 NAC codes? If so, set it up for the proper NAC for Wilshire's simplex channel from the DB. If not no big deal, just try to set the squelch a little tighter or possibly turn on the attenuator on that channel (but not the others).

Not that I know of. I have a Uniden 396T.

 

[Radio_Lady]

Thanks for the insight. Since I'm using an outdoor antenna and can't move it any more to get better reception, the only thing I can try is adjust the squelch. Is simplex digital or analog? My squelch is for analog.

All of LAPD's own UHF frequencies are digital except LAPD Access, 484.4375 which is analog so agencies without digital radios can talk with them. Their radios are programmed with a lot of Mutual Aid and other agencies' frequencies which are analog, but LAPD doesn't use those regularly.

Besides the RadioReference Database for LAPD, take a look through these two lists,

Los Angeles Police Department Radio Frequencies - 2011 Very current and very accurate, but includes only the commonly-used patrol, traffic, tactical, and mutual aid frequencies

and

Freq Of Nature Los Angeles Police More comprehensive, but about 3 years out of date (doesn't include Olympic and Topanga Divisions, for example).

 

[jewie27]

The squelch does nothing for me.