VA Hospital 407.8375

[DonnieDog]

I have recently discovered that local VA Hospital is operating on 407.8375, after monitoring them for a few days off and on there is something that is opening the squelch every 5 seconds constantly and its very quick too. I have monitored this from two devices from two locations that are about 12 miles apart and getting the same thing. I also cannot decode the PL/DPL when there is normal radio conversations. I know its not P25 either. Just wondering what type of system this my be or any info on that quick burst that is opening the squelch. Any input would be great.

 

[commstar]

Ltr?

Your description sounds like LTR to me-
A beacon at set intervals and no tone describes LTR me.....

Can you post an audio sample to verify?

I have no knowledge of any Fed love for LTR but I guess it could happen?

"LTR is a method of channel management that gives all users of the system automatic access to all channels. This results in minimum waiting to make a call and the most efficient use of the available channels. Trunking is controlled by logic circuitry in the mobile transceivers and the repeaters. This circuitry continually monitors the system and generates data messages which update the mobiles and repeaters as to which repeaters are free.

LTR systems usually do not have a dedicated control channel. Each repeater in LTR systems have there own controller, and all of the controllers are synchronized. Each controller sends out a "data burst" approximately every 10 seconds so that the subscriber unit knows that the system is there. This is one way to tell that the system is a LTR system.

With LTR radio systems, hang-time is not used for dispatch (mobile-to-mobile) calls. A channel is held for only the length of the transmission so that the time between transmissions can be used by others making calls. The only time this is used in LTR trunking is when making telephone calls." from here

Mike

 

[ecps92]

Can your Radio to LTR ? change the mode and see what reads, when those "Clicks" occur

I have recently discovered that local VA Hospital is operating on 407.8375, after monitoring them for a few days off and on there is something that is opening the squelch every 5 seconds constantly and its very quick too. I have monitored this from two devices from two locations that are about 12 miles apart and getting the same thing. I also cannot decode the PL/DPL when there is normal radio conversations. I know its not P25 either. Just wondering what type of system this my be or any info on that quick burst that is opening the squelch. Any input would be great.

 

[W9NES]

407.8375 here in Indianapolis is VA hospital and is used by the VA Police Department.It is p-25 and is being heard with a Uniden BC 996 T and the antenna that came with the 996T in my basement and I am 13 miles Northwest of Downtown Indianapolis.

 

[DonnieDog]

I dont think I can get an audio sample. It is only a quick enough burst to break squelch and then about 5 seconds later it does it again. Ive tried all the trunking modes on my BC780xlt with nothing. I am able to hear normal radio traffic with my 780 so I know its not P25 either. Im stumped.

 

[unitcharlie]

407.83750/293 NAC is the Lexington (KY) V.A. Leestown using P-25, 408.03750/ 67.0 PL is the Lexington V.A. Leestown Maintenance Section using conventional.... never heard LTR but it could happen. The rr.com wiki has a good article on Mapping an LTR System, maybe you have found a new system! Good Luck, and keep us posted!

 

[DonnieDog]

I hope to have a Uniden 996 Digital Scanner within the next month so ill know for sure then I guess if I cant found out sooner. Thanks for all the help!!!

 

[DonnieDog]

I have a few more freqs for the same facility. These two also have the mysterious click every few seconds. 410.900 and 409.700

Im busting my brain trying to figure these out. I know it is the VA Hospital for sure. I cant figure the "Click" out on these three channels.

On the 407.8375, I found that 416.8375 is the input side.

Still not decoding any PL./DPL Tones, and yes I cant hear voice traffic on my 246 and my 780.

Thanks for any help given!

 

[W9NES]

Donnie Dog, I have found VA hospital here in Indianapolis on the following frequencies using p-25.VA Police Department 408.0375 ENC but the radios shows p-25 and I still hear them and 407.8375 VA Maintence.I did put in the 410.900 and the 409.700 to scan here in Indianapolis,Indiana to see if I Hear anything.Take Care.Best Requards,Tim DeLong W9NES Indianapolis,Indiana(Uniden 996T and Uniden 396T)

 

[ecps92]

Have you tried to program your Radio for LTR and see if those clicks are LTR??

I have a few more freqs for the same facility. These two also have the mysterious click every few seconds. 410.900 and 409.700

Im busting my brain trying to figure these out. I know it is the VA Hospital for sure. I cant figure the "Click" out on these three channels.

On the 407.8375, I found that 416.8375 is the input side.

Still not decoding any PL./DPL Tones, and yes I cant hear voice traffic on my 246 and my 780.

Thanks for any help given!

 

[DonnieDog]

wouldnt no in what order the freqs were and the LCNs??

 

[ecps92]

It's actually quite simple. And the Wiki has the directions.

In conventional mode [NOT Trunked] enter the frequency in question, then change the mode to LTR, press manual and then sit on the frequency and it will read-out the LTR info. Do the same on the next Freq in question. Now you know the LCN Order...

wouldnt no in what order the freqs were and the LCNs??

 

[DonnieDog]

where could I find a sound clip of an LTR system to see if this is the same as what im hearing?

 

[DaveNF2G]

The VA hospital in Albany, NY, had a bizarre form of trunking for a while on UHF. There were LTR-like clicks on it at times, but it wasn't trackable with any scanner or software. They have since moved to VHF conventional P25.

 

[DonnieDog]

I have recently found out myself and with the help of KF4UEL that this is in fact an LTR system.
407.8375
408.0375
409.700
410.900

But like always no LCNs

anyone close by give it a try also.


Ive tried a couple of different ways with LTR and im getting TGID quite often but some are 28 and 30..weird

 

[ecps92]

Which Site do you think it is ?
Facilities in Tennessee - Locations

My experience has been only with the Medical Centers and found the
Clinics and outpatient centers use Contract Security as they are not
that large for a complex. ?

I have recently found out myself and with the help of KF4UEL that this is in fact an LTR system.
407.8375
408.0375
409.700
410.900

But like always no LCNs

anyone close by give it a try also.


Ive tried a couple of different ways with LTR and im getting TGID quite often but some are 28 and 30..weird

 

[DonnieDog]

Its the Mountain Home Facility in Johnson City

 

[ecps92]

Thanks...

Its the Mountain Home Facility in Johnson City

 

[DonnieDog]

With me having a slight bit of pull working at 911 just a few blocks away I thought about calling them and asking for whoever is in charge of the radio system and just asking them but I doubt they would even know......LOL