U.S. Marshals Service P25 TRS (BEE00-4F0)

[GTR8000]

Ask and ye shall receive.

Pretty definitively LSM. Very interesting, the plot thickens.

 

[RadioDitch]

Pretty definitively LSM. Very interesting, the plot thickens.

Random but Sean and I were talking about it on the phone when he ran out for these. Perhaps Secret Service wide area rather than Bureau of Prisons?

Also site name update submitted.

 

[rr60]

If indeed 406.6125 is LSM and we have report of full quieting signal Westchester near TZ, my guess on likely location is.

1) Quarropas St, White Plains or 2) KHPN.

 

[RadioDitch]

If indeed 406.6125 is LSM and we have report of full quieting signal Westchester near TZ, my guess on likely location is.

1) Quarropas St, White Plains or 2) KHPN.

NYS Supreme Court Westchester would make sense for a subsite based on the height of the building, and interestingly, the Secret Service is right across the street. Also Site 1 is now also receivable with an RSSI of -52 near the Federal Courthouse in Newark, but unreceivable in Garwood, and again, has poor coverage on an RTL around the MDC in Brooklyn at street level.

 

[rr60]

NYS Supreme Court Westchester would make sense for a subsite based on the height of the building, and interestingly, the Secret Service is right across the street. Also Site 1 is now also receivable with an RSSI of -52 near the Federal Courthouse in Newark, but unreceivable in Garwood, and again, has poor coverage on an RTL around the MDC in Brooklyn at street level.

Weird 😎

 

[RadioDitch]

Wierd😎

No, not really. But the inconsistent coverage, rather what is covered, could be an indicator of who the intended user(s) are.

 

[INDY72]

On days that you were in dead zone was the USSS Radio Killer truck rolling? Remember if its running your in the cone of silence, they are not.

 

[RadioDitch]

On days that you were in dead zone was the USSS Radio Killer truck rolling? Remember if its running your in the cone of silence, they are not.

No, my brother was down there at 03h00 with nobody in town. There'd be no reason for Roadrunner or Watchtower to be out and active. This was just normal scattered dead spots of poor or no coverage.

 

[rr60]

New wrinkle. Whereas 406.6125 was determined to be LSM. My original report of signal was off an OmnI.

I hooked up my trusty commercial Yagi. What I found surprised me.

The RSSI that is strongest for my location is not from downtown New York City which is 090 degrees from me about 25-30 miles west.

The bearing to strongest signal is 150 degrees which is in direction of Linden, Staten Island, lower Brooklyn and JFK. 15, 20, 30, 35 miles respectively.

Perhaps another simulcast site along that path.😎

 

[RadioDitch]

New wrinkle. Whereas 406.6125 was determined to be LSM. My original report of signal was off an OmnI.

I hooked up my trusty commercial Yagi. What I found surprised me.

The RSSI that is strongest for my location is not from downtown New York City which is 090 degrees from me about 25-30 miles west.

The bearing to strongest signal is 150 degrees which is in direction of Linden, Staten Island, lower Brooklyn and JFK. 15, 20, 30, 35 miles respectively.

Perhaps another simulcast site along that path.😎

The measurements taken by Sean were taken from on the ground in a distance measured in feet rather than 25-30 miles away, so I believe his data to be accurate. At least for a subsite location.

 

[rr60]

That was fast…..
I am a fan of little brother🤣. Trying to figure out location of other LSM .6125 sites.

I was on the ground too, although I have +HAAT. 150 Degrees brought UT green bars full scale. Based on past RDF seems as if 20 miles radius is reasonable for most LSM.

Todt Hill would look nicely into Jersey. Maybe more than one .6125 on the air now.

Edit: Elizabeth maybe?

 

[GTR8000]

New wrinkle. Whereas 406.6125 was determined to be LSM. My original report of signal was off an OmnI.

I hooked up my trusty commercial Yagi. What I found surprised me.

The RSSI that is strongest for my location is not from downtown New York City which is 090 degrees from me about 25-30 miles west.

The bearing to strongest signal is 150 degrees which is in direction of Linden, Staten Island, lower Brooklyn and JFK. 15, 20, 30, 35 miles respectively.

Perhaps another simulcast site along that path.😎

While Yagis are obviously directional antennas, they are not laser beams, and are not as focused as you might believe. You might be surprised at how often a Yagi picks up a stronger signal off a side lobe vs pointed directly at the transmitter, sometimes by as much as 10-20 degrees off-center.

With you being as far as 25-30 miles from the city, that can lead to quite a large margin of error.

 

[n2nov]

From the middle of the north shore of Staten Island using a vertically polarized 4-element UHF beam at 30 foot height, 406.6125 is heard with 5 bars pointing at lower Manhattan and only 3 bars point 180 degrees away at Todt Hill.

 

[jake_Braker]

While Yagis are obviously directional antennas, they are not laser beams, and are not as focused as you might believe. You might be surprised at how often a Yagi picks up a stronger signal off a side lobe vs pointed directly at the transmitter, sometimes by as much as 10-20 degrees off-center.

With you being as far as 25-30 miles from the city, that can lead to quite a large margin of error.

Can confirm this. I learned about this when I have a Yagi pointed towards Cleveland County but yet I get strong signal from Mecklenburg county

 

[katt02]

I decided to check out site 1.1, and for lack of more accurate terms, I am receiving it fairly well in west Essex. More importantly, from DSD this site has a new neighbor, site 1.103, control channel 169.6375. I was unable to receive anything from this channel in my same location. I'll insert a screenshot below.

 

[GTR8000]

I've got a halfway decent lock on Site 103 in Unitrunker. NAC is 4F0, alt control is 171.6625, sole peer is Site 1.

Signal is pretty strong in the Orange/Rockland areas. Appears to be C4FM modulation, so likely a standalone site.

 

[RadioDitch]

I've got a halfway decent lock on Site 103 in Unitrunker. NAC is 4F0, alt control is 171.6625, sole peer is Site 1.

Signal is pretty strong in the Orange/Rockland areas. Appears to be C4FM modulation, so likely a standalone site.

This is a really fresh site. As of a week ago Monday (27th), it was not showing as a peer to Site 1. Currently it's not being heard on the ProScan remote in Garwood (Union County).

 

[GTR8000]

I hate to speculate about any of this stuff, as I got burned at the outset thinking the Randolph site was on Beacon...but this site does seem to perhaps be north of the city based on where I'm able to receive/decode it. Then again I believe I said the exact same thing about Randolph earlier in this thread, so yeah...take that with a grain of salt. 🤦‍♂️

 

[GTR8000]

Nothing heard in Randolph @ 1,000' ASL, so it doesn't seem to be coming from NJ or NYC at this point, but more likely somewhere in the North Westchester/Putnam/South Dutchess area.

 

[rr60]

Nothing heard in Randolph @ 1,000' ASL, so it doesn't seem to be coming from NJ or NYC at this point, but more likely somewhere in the North Westchester/Putnam/South Dutchess area.

I listened yesterday and this morning with light moderate tropo. Not heard. Took a look through V &U bands as well. Nothing new seen.