NYPD inputs not repeatered?

[nycpress]

Since, at least, yesterday, the 84-88 Precinct division (476.7625) is, mostly, broadcasting just the dispatcher's transmissions. The incoming transmissions from the field are not being rebroadcast by the repeater, except in a few individual instances from certain units. The dispatcher is clearly able to hear the units and vice-versa.

 

[n3obl]

yes the dispatcher is not listening to the output of the mixer. They monitor the input channel.

 

[nycpress]

yes the dispatcher is not listening to the output of the mixer. They monitor the input channel.

Yes, that's not the question. The question is why are the inputs not being rebroadcast out except from some individual units? It's almost as if it's operating like an FDNY "mixer-off." Is this a test of a hybrid encrypt/clear mode?

 

[pro106import]

I just listened to all other precincts in all boros. That is the only precinct with no repeater right now. Interesting. Maybe its just a hardware problem? But you said you did hear it repeat on occasion. So IDK.
I just heard 8 Charlie , and the dispatcher is getting mad because units are cutting each other off, lol. Well, of course they are, because they can't hear when another unit is transmitting.

 

[pro106import]

I just went to the 84 / 88th frequency on my scanner. It is back repeaterized again 100%.

 

[coolrich55]

There is more to the story as of today, Saturday. Not all but many units in the 88-84 are operating in digital mode. Dispatch is still analog and you can still listen with an analog scanner but listen to the precinct units, you can definitely hear the distinct sound of the digital transmissions. Of course it sounds pretty horrible. Never thought I'd see the day, but it's happening. Only time will tell what the future of listening to nypd will be....

 

[dave3825]

Think I caught a slight hint of digital but hard to tell with all the fading and scratchiness on that feed.

 

[pro106import]

There is more to the story as of today, Saturday. Not all but many units in the 88-84 are operating in digital mode. Dispatch is still analog and you can still listen with an analog scanner but listen to the precinct units, you can definitely hear the distinct sound of the digital transmissions. Of course it sounds pretty horrible. Never thought I'd see the day, but it's happening. Only time will tell what the future of listening to nypd will be....

@coolrich55 , are you monitoring it direct or through the feed? I've been monitoring direct with open mode search and so far 100% analog 136.5
Maybe the feed provider is having issues? IDK
I'll monitor for a while to see what I hear.

 

[n2nov]

@coolrich55 , are you monitoring it direct or through the feed? I've been monitoring direct with open mode search and so far 100% analog 136.5
Maybe the feed provider is having issues? IDK
I'll monitor for a while to see what I hear.

The only way to know for sure about digital on the repeater input vs analog on the repeater output is to find someone in the local precinct area to listen to the input and report/record what they hear.

 

[richee2000]

I was just listening to the 84/88 precinct on open mhz... Sounds like totally analog base and portables but horrible reception, extremely noisy which might be what you're hearing

 

[pro106import]

The output frequency is 100% analog listening from my location for the last few hours. It's a stretch to say the least to try to hear units on the input for me (Approx. 70 miles away). I am not sure why they would choose use P25 to the input of the repeater, but someone might be able to enlighten me. And they would have to have replaced the repeater with a P-25 capable one, and I don't think they would have done that unnoticed to this point.

 

[GTR8000]

The NYPD has been upgrading the RF infrastructure for a number of years now, as some of us have stated years ago, but seems to have fallen on deaf/unconvinced ears. GTR 8000 repeaters which are provisioned for mixed mode, and they even went so far as to have MSI design a new mixed-mode comparator (GRV 8000) specifically for them.

That said, it's pretty unlikely that anyone is transmitting in P25 mode on the input and coming out the other side as analog. That's not how mixed mode works; it's first come, first serve per modulation.

If you guys are trying to determine what is going on by listening to a streaming audio feed, that's going to be less than ideal.

 

[k2hz]

The NYPD has been upgrading the RF infrastructure for a number of years now, as some of us have stated years ago, but seems to have fallen on deaf/unconvinced ears. GTR 8000 repeaters which are provisioned for mixed mode, and they even went so far as to have MSI design a new mixed-mode comparator (GRV 8000) specifically for them.

That said, it's pretty unlikely that anyone is transmitting in P25 mode on the input and coming out the other side as analog. That's not how mixed mode works; it's first come, first serve per modulation.

If you guys are trying to determine what is going on by listening to a streaming audio feed, that's going to be less than ideal.

I would also suggest, in a receiver voting system, the audio from a particular voting site can sound odd due to a problem at the receiver, the comparator or the circuit between them. Both the fact of some units sounding "digital" and the reported case of a few, but not all, units being heard on the repeater sounds like a voter problem.

I an not familiar with the present NYPD configuration but, in my experience with voter systems, a problem with the circuit between the comparator and the repeater causes the repeater to "fail over" to self receiver but dispatcher still hears system comparator audio from all sites.

Too "hot" audio levels from a particular receiver in an analog system into the comparator can cause distortion that sounds like a bad digital signal.

 

[KevinC]

The NYPD has been upgrading the RF infrastructure for a number of years now, as some of us have stated years ago, but seems to have fallen on deaf/unconvinced ears. GTR 8000 repeaters which are provisioned for mixed mode, and they even went so far as to have MSI design a new mixed-mode comparator (GRV 8000) specifically for them.

That said, it's pretty unlikely that anyone is transmitting in P25 mode on the input and coming out the other side as analog. That's not how mixed mode works; it's first come, first serve per modulation.

If you guys are trying to determine what is going on by listening to a streaming audio feed, that's going to be less than ideal.

Be careful using the term “mixed-mode” for those comparators. They are either/or, not true mixed-mode like we’re used to.

 

[GTR8000]

Be careful using the term “mixed-mode” for those comparators. They are either/or, not true mixed-mode like we’re used to.

True that...even more reason why hearing analog and P25 on the same frequency is dubious.

 

[coolrich55]

@coolrich55 , are you monitoring it direct or through the feed? I've been monitoring direct with open mode search and so far 100% analog 136.5
Maybe the feed provider is having issues? IDK
I'll monitor for a while to see what I hear.

Direct with an analog scanner. I can't explain it technically. It just sound digital. Plus those units have no mdc tone after the transmissions like the others that sound normal analog do. The only thing I can compare it to is way back when the CSP made the switch from low band to their first digital system there was a very brief time during the changeover when the "digital" transmissions were coming over the 42.xx frequency. Obviously it wasn't digital that I was receiving with my old analog scanner back then. Just a rebroadcast that they did for that switch over process. Hopefully that makes some sense lol.

 

[Priority-One]

I will sit on Div 4 Brooklyn today on my XTL and see what i come up with

 

[KC2zZe]

I'm a bit confused. The 84 and 88 PCTs share Radio Zone 25. How will monitoring "Div 4 Brooklyn" help to untangle what's going on on the Zone 25 repeater?

 

[Priority-One]

I'm a bit confused. The 84 and 88 PCTs share Radio Zone 25. How will monitoring "Div 4 Brooklyn" help to untangle what's going on on the Zone 25 repeater?

I am unsure how this comment ended up here, I was commenting on the Transit thread. My apologies.

 

[Ensnared]

The NYPD has been upgrading the RF infrastructure for a number of years now, as some of us have stated years ago, but seems to have fallen on deaf/unconvinced ears. GTR 8000 repeaters which are provisioned for mixed mode, and they even went so far as to have MSI design a new mixed-mode comparator (GRV 8000) specifically for them.

That said, it's pretty unlikely that anyone is transmitting in P25 mode on the input and coming out the other side as analog. That's not how mixed mode works; it's first come, first serve per modulation.

If you guys are trying to determine what is going on by listening to a streaming audio feed, that's going to be less than ideal.

Agreed.

In the recent past, I made some comments to you that were inappropriate and rude (pig conversation).

I would like to apologize. You have assisted and helped me in the past on many occasions. I am very embarrassed.