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DC/Maryland/Virginia 170.8/171.35/173.1875

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#1
Several weeks ago I noticed that 170.8000/171.3500/173.1875 carry the same traffic simultaneously. 170.8000 is P25 NAC 098, 171.3500 is P25 NAC 090 and 173.1875 is P25 NAC 099. Traffic is mostly from radio ids 848xxxx with some from radio ids 52xxxxx. All encrypted except for what appeared to be accidental clear transmissions such as "10-8 Manassas" etc. 173.1875 is carried in the db as being part of site 007-001 of IWN NCR Integrated Wireless Network (IWN) National Capital Region Trunking System, Washington, Multi-State - Scanner Frequencies but I get a good decode of NAC 099 instead of NAC 010 and 011 that is normally associated with IWN.
 

dpcain

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#2
I have the second one as output 171.325 NAC 086, but that might be another site. Those are all sites of the DHS/ICE WAS1 votescan net.

I think, in order, your three are Metro, Unknown, and Fort Detrick. I think the 171.325 is down in Norfolk.
 

dlwtrunked

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#3
I have the second one as output 171.325 NAC 086, but that might be another site. Those are all sites of the DHS/ICE WAS1 votescan net.

I think, in order, your three are Metro, Unknown, and Fort Detrick. I think the 171.325 is down in Norfolk.
Known simulcast:
163.6750 Charlottesville NAC 084
163.7250 Washington NAC 073
168.7625 Richmond NAC 083
170.7125 Fredericksburg/Spotsylvania NAC 082
170.8000 Fairfax NAC 098
169.9375 Roanoke NAC 089
170.1250 Harrisonburg NAC 088
171.3250 Norfolk NAC 086
171.3500 ? NAC 090
Input is 162.825 and has been seen with a NAC 001.

173.1875 (IWN) being simulcast is probably not true but a coincidence in timing (I have almost made similar coincidences observing other systems). 173.1875 is seen here but has not been simulcast with the above.
 
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dlwtrunked

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#4
Known simulcast:
163.6500 Bull Run NAC 081
163.6750 Charlottesville NAC 084
163.7250 Washington NAC 073
168.7625 Richmond NAC 083
169.9375 Roanoke NAC 089
170.1250 Harrisonburg NAC 088
170.7125 Fredericksburg/Spotsylvania NAC 082
170.8000 Fairfax NAC 098
171.3250 Norfolk/Driver NAC 086
171.3500 ? NAC 090
Input is 162.825 and has been seen with a NAC 001.

173.1875 (IWN) being simulcast is probably not true but a coincidence in timing (I have almost made similar coincidences observing other systems). 173.1875 is seen here but has not been simulcast with the above.
Note that 171.3250 is actually at Driver, VA and I left out 163.6500-so I edited above and ordered them by frequency.
 
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Known simulcast:
163.6750 Charlottesville NAC 084
163.7250 Washington NAC 073
168.7625 Richmond NAC 083
170.7125 Fredericksburg/Spotsylvania NAC 082
170.8000 Fairfax NAC 098
169.9375 Roanoke NAC 089
170.1250 Harrisonburg NAC 088
171.3250 Norfolk NAC 086
171.3500 ? NAC 090
Input is 162.825 and has been seen with a NAC 001.

173.1875 (IWN) being simulcast is probably not true but a coincidence in timing (I have almost made similar coincidences observing other systems). 173.1875 is seen here but has not been simulcast with the above.
Here is what I am seeing, looks like simulcast
 

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dlwtrunked

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I believe your 171.3500 is in Rockville MD. It was part of the old ICE WAS-5 net if I remember correctly.

Good hunting de Larry
That would make sense. I know it is somewhere north of Fredericksburg, VA. regarding 173.1875,
 
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dlwtrunked

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Here is what I am seeing, looks like simulcast
I do not see it in Fredericksburg. What is seen there now (and for the last week) is the strong control channel in La Plata (Spring Hill), MD, for DC area IWNS on 173.1875 (also used by IWNS in Rockville, MD st times). I am puzzle by why you do not see that signal there also. Note in the attached, you can see the simulcast come up (particulary my local 170.7125) but not seen on 173.1875 which only shows the IWN MD signal.
 

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#9
163.7250 Washington NAC 073 IS actually two sites - simulcast
Alexandria and Washington

Known simulcast:
163.6750 Charlottesville NAC 084
163.7250 Washington NAC 073
168.7625 Richmond NAC 083
170.7125 Fredericksburg/Spotsylvania NAC 082
170.8000 Fairfax NAC 098
169.9375 Roanoke NAC 089
170.1250 Harrisonburg NAC 088
171.3250 Norfolk NAC 086
171.3500 ? NAC 090
Input is 162.825 and has been seen with a NAC 001.

173.1875 (IWN) being simulcast is probably not true but a coincidence in timing (I have almost made similar coincidences observing other systems). 173.1875 is seen here but has not been simulcast with the above.
 
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#10
173.1875 should be Fort Detrick and $099
Known simulcast:
163.6750 Charlottesville NAC 084
163.7250 Washington NAC 073
168.7625 Richmond NAC 083
170.7125 Fredericksburg/Spotsylvania NAC 082
170.8000 Fairfax NAC 098
169.9375 Roanoke NAC 089
170.1250 Harrisonburg NAC 088
171.3250 Norfolk NAC 086
171.3500 ? NAC 090
Input is 162.825 and has been seen with a NAC 001.

173.1875 (IWN) being simulcast is probably not true but a coincidence in timing (I have almost made similar coincidences observing other systems). 173.1875 is seen here but has not been simulcast with the above.
 

dlwtrunked

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#12
163.7250 Washington NAC 073 IS actually two sites - simulcast
Alexandria and Washington
I am skeptical on that. You can actually easily see downtown DC from some places in Alexandria as it is not far away. The distance between parts of Alexandria and DC is as close as 2 miles across water, It is usually thought to be a Washington 1 (region) site in Alexandria.
 

dlwtrunked

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#13
Note that 171.3250 is actually at Driver, VA and I left out 163.6500-so I edited above and ordered them by frequency.
The above was a misread of my notes. Driver uses 163.7250. I did not get the NAC. 171.3250 may indeed be downtown Norfolk. I will check further in my notes.
 

LeSueurC

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#14
163.725 NAC 085, Driver. 171.325 NAC 086, I'm saying it's Downtown Norfolk. I'm about 5 miles from the Driver tower and I get 163.725 stronger than 171.325. 171.325 is either Norfolk or it could be Newport News or maybe even VA Beach.
 
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#15
9.65 miles between the two sites ;)

I am skeptical on that. You can actually easily see downtown DC from some places in Alexandria as it is not far away. The distance between parts of Alexandria and DC is as close as 2 miles across water, It is usually thought to be a Washington 1 (region) site in Alexandria.
 
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#16
correct
171.3250 is downtown
163.7250 is right near 337 & 627

163.725 NAC 085, Driver. 171.325 NAC 086, I'm saying it's Downtown Norfolk. I'm about 5 miles from the Driver tower and I get 163.725 stronger than 171.325. 171.325 is either Norfolk or it could be Newport News or maybe even VA Beach.
 
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