150.600 & 150.350 P-25

richrowl · #1 (**permalink**) 08-31-2007, 8:18 AM

I am hearing 150.600 and 150.350 both P-25 ENC on the Uniden 785D and the 796D.
Both appear to have equal signal strength and both do not transmit at the same time.
This makes it an unlikely pair. Both are relatively active during the day and no activity
was heard during the nightime hours. Hearing these on a Radio Shack discone about 25 feet high, neither is received on the Pro-96 which indicates the transmitter in not near my location at Belmont and Turner Rds in Chesterfield County.

MOTORHEAD3902 · #2 (**permalink**) 08-31-2007, 9:35 AM

Bootleg Lithuanian Taxi Drivers using eBay gray market radios?

kg4ivt · #3 (**permalink**) 08-31-2007, 10:46 AM

There's another thread about this a few posts down.

I'm hearing 150.600MHz at about an S9 in downtown Richmond at the moment.

richrowl · #4 (**permalink**) 08-31-2007, 11:58 AM

Quote:

Originally Posted by kg4ivt

There's another thread about this a few posts down.

I'm hearing 150.600MHz at about an S9 in downtown Richmond at the moment.

There are no previous posts about 150.350 and now 149.015 and 150.100 are also active P-25 ENC

Gilligan · #5 (**permalink**) 08-31-2007, 3:46 PM

Could this be it?

The Defense Supply Center Richmond, a Department of Defense installation, sits on just over 600 acres in southern Chesterfield County, Virginia.

I see it has a Motorola trunked system on site. But it could still have VHF freqs as well.

MOTORHEAD3902 · #6 (**permalink**) 08-31-2007, 4:50 PM

While a very good postulation, vis-a-vis the VHF freqs, I can-with an almost comfortable degree of certainty- say that this haint the case.
DGSC is making great use of the Eastern Va regional trunk system.

KF4ZTO · #7 (**permalink**) 08-31-2007, 6:40 PM

The original post did mention 149.015 (or 149.0125). I dont think this is Defense Supply Center Richmond either, I've been scanning down here for a while and have never heard these frequencies active before.

Edit:

I'm starting to think Civil Air Patrol now as well. (viz other post concerning this activity)
Now showing:

149.0125
150.1000
150.3500
150.6000
as being active. P25 encryption.

KF4ZTO · #8 (**permalink**) 01-17-2013, 9:22 AM

I'm hearing nearly constant activity on 150.3500 and 150.2375. NAC 230 on both frequencies. And 100% encryption of course.

W4UVV · #9 (**permalink**) 01-17-2013, 11:46 AM

My best guesses with comments..The two frequencies, 150.2375 mhz. and 150.3500 mhz. are related but do not simulcast the others' transmissions. Numerous varied NACs are used with two of most currently active being 214 and 230 but will change as new users transmit. As posted all transmissions are P25 encrypted. These two transmissions will provide wide area coverage centered on Richmond. A number of federal users now share previously dedicated single user only frequencies. This practice allows for more remote site simulcasting which results in a wider geographical area coverage. In this case these are two separate separate standalone alone transmissions interfaced to the system and do not appear to be repeaters. Possibly a dedicated T1 line with a system controller is providing the T/R and audio interfaces. Two frequencies are used because first it provides redundancy if one fails and maybe secondly if the traffic volume on one transmitter reaches a threshold level the requesting user's comms are redirected to the other transmitter. To the user the comms are seamless.

If a federal user's radio can access one of the system's interlinked antenna locations he/she can simulcast throughout the total geographical coverage area of the interlinked system. For example, an ICE unit in Washington can have comms with an ATF user in the Richmond area or wherever the system is interlinked geographically. In NOVA I've heard these type of multi-frequency system comms typically in the 163-170 mhz. range. Again, you are not hearing just two federal users in Richmond. The comms heard may represent different federal agency users from different geographical locations possibly in the VA/MD/DC areas or other selected geographical interlinked locations. That's why the comm activity appears to be frequent at times.

If not already active I suspect Tidewater and western Va. in time will have comparable systems.

KF4ZTO · #10 (**permalink**) 01-17-2013, 9:33 PM

Could it be related to the 25 Cities Project? I know such interop frequencies exist in both the DC and Tidewater metro areas. It would make sense to provide coverage in the metropolitan area between those two.

ecps92 · #11 (**permalink**) 01-18-2013, 6:41 AM

The typical Federal Interop uses $653 for a NAC

Also those freq's are typically Military
Army, Air-Force, Coast Guard, Navy-Marines, CG Aux and USAF Aux [CAP]

Quote:

Originally Posted by KF4ZTO

Could it be related to the 25 Cities Project? I know such interop frequencies exist in both the DC and Tidewater metro areas. It would make sense to provide coverage in the metropolitan area between those two.

KF4ZTO · #12 (**permalink**) 02-26-2013, 1:36 PM

Mods:

I know there was another thread discussing encrypted VHF government communications in Central VA (Richmond area) but I can't seem to find it. Could this be merged with that thread if its still available?

Anyway, I'm hearing 100% encrypted activity on 149.150 with a NAC of 218 in Richmond, full signal strength. The PSR-800 is showing "TGID 16".

Also hearing activity on 149.600 with a NAC of 196 at the same time.

Anybody have a list of all these frequencies we've heard lately? Could it be part of the IWN system that covers both the DC and Newport News areas? Would make sense to have in-fill coverage for the Richmond area as well.

KF4ZTO · #13 (**permalink**) 02-26-2013, 2:33 PM

Just an update, hearing activity on 150.600 NAC224, 149.150, NAC218 and 149.600 NAC196

gcgrotz · #14 (**permalink**) 02-27-2013, 9:23 AM

Could the 149.xxx be CAP? I know that was their range and that they have converted to P25. Just a guess...

ecps92 · #15 (**permalink**) 02-27-2013, 11:26 AM

Not part of the channel plans

Quote:

Originally Posted by gcgrotz

Could the 149.xxx be CAP? I know that was their range and that they have converted to P25. Just a guess...

KF4ZTO · #16 (**permalink**) 02-27-2013, 12:30 PM

^Indeed. I would be surprised to see CAP running 100% encryption too.

Audiodave1 · #17 (**permalink**) 02-27-2013, 7:49 PM

Do all of the transmitting units have the same radio ID?

Dave

gcgrotz · #18 (**permalink**) 02-28-2013, 8:05 AM

Quote:

Originally Posted by ecps92

Not part of the channel plans

Thanks Bill for the info and the link. I was just taking a stab at it. From a fellow cruiser, its good to see your sig again. I'll shut up now...

ecps92 · #19 (**permalink**) 02-28-2013, 12:01 PM

ha ha ha , Enjoy

Quote:

Originally Posted by gcgrotz

Thanks Bill for the info and the link. I was just taking a stab at it. From a fellow cruiser, its good to see your sig again. I'll shut up now...

kennyblues · #20 (**permalink**) 03-01-2013, 10:23 AM

This is all very interesting. Back in November 2010 we had something very similar in the Boston area.
All ENC, No real idea as to who/what/where/why.
149.4000 $194
149.8250 $198
149.7000 $202
149.8750 $206
150.1000 $210
149.1500 $218
149.5375 $222
150.2125 $228