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San Francisco Bay Area Discussion - Local area specific discussion for the San Francisco Bay area including the North, East and South Bays.

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Old 10-05-2015, 11:33 AM
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Default Bay Area Federal Unknowns

I'd like to get a thread going for unknown federal frequencies SF Bay Area (163-174MHz and 406-420MHz). I'll start.

163.3750 / Repeater / 192.8 PL / Talk of facilities and "where's the radar gun?"
164.3500 / Repeater / 146.2 PL / low air pressure and "this is the maintenance mechanic, go ahead"

Last edited by kma371; 10-05-2015 at 11:40 AM..
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Old 10-05-2015, 5:09 PM
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163.3750 isn't that the DoE for the Stanford Linear Accelerator Center in Menlo Park ?

164.3500 is likely another DoE as its been reported during NSSE and in IL at a DoE site

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I'd like to get a thread going for unknown federal frequencies SF Bay Area (163-174MHz and 406-420MHz). I'll start.

163.3750 / Repeater / 192.8 PL / Talk of facilities and "where's the radar gun?"
164.3500 / Repeater / 146.2 PL / low air pressure and "this is the maintenance mechanic, go ahead"
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Old 10-06-2015, 12:59 AM
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163.3750 isn't that the DoE for the Stanford Linear Accelerator Center in Menlo Park ?
Could be, it's not listed in the database.

UPDATE, looked through a federal book I have and it is listed for that.

Last edited by kma371; 10-06-2015 at 1:24 AM..
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Old 10-06-2015, 1:00 AM
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171.4375 / N293 / unknown traffic, only logged
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Old 01-26-2016, 6:07 PM
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170.9875 / NAC 304 / encrypted traffic only
167.6875 / NAC 730 / logged only
172.1875 / NAC 510 / encrypted traffic only

Last edited by kma371; 01-26-2016 at 6:35 PM..
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Old 01-27-2016, 6:22 AM
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Looks like some newer activity, in build-up/out for SB50 ???

Also some previous notes from past SB's at

The Fed Files Blog: Search results for super bowl

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170.9875 / NAC 304 / encrypted traffic only
167.6875 / NAC 730 / logged only
172.1875 / NAC 510 / encrypted traffic only
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Old 01-28-2016, 11:45 PM
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170.3375 / NAC 300 / encrypted traffic only
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Old 01-29-2016, 4:32 PM
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168.4875 / NAC 293 / clear voice, not enough traffic to confirm
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Old 01-29-2016, 6:14 PM
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Quote:
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170.3375 / NAC 300 / encrypted traffic only
The P-25 radio ID's on this are in the 605xxxx range, so likely DHS ICE units on this. No clear traffic yet...

- Chris
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Old 01-29-2016, 10:00 PM
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The P-25 radio ID's on this are in the 605xxxx range, so likely DHS ICE units on this. No clear traffic yet...

- Chris
I'll listen more and see what kind of radio IDs I get.
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Old 01-30-2016, 7:19 AM
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Was reported back in 2009 for some Aerial Suv in the Bay Area

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168.4875 / NAC 293 / clear voice, not enough traffic to confirm
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Old 01-30-2016, 12:25 PM
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Default Civil Air Patrol and Combat Air Patrol on Tuesday and Wednesday

Civil Air Patrol's California Wing will fly Tuesday in Fresno and on Feb. 3 in Oakland to help ensure the safety and security of airspace around Super Bowl 50.
In order to help train Air Force fighter aircrews and maintain their proficiency, Civil Air Patrol flies its Cessna airplanes into "restricted airspace" to simulate a trespassing aircraft while Air Force jet crews practice intercept techniques. The Air Force pilots fly alongside the CAP plane, make radio contact and gu...
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Old 01-31-2016, 2:23 PM
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171.9875 MHz is interesting over here at Levi's Stadium. I have seen three different NAC's in use; $167, $304 and $7CE. All confirmed by monitoring and likely not false readings.

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Old 01-31-2016, 4:58 PM
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I've logged it with a 167 and 304 NAC as well
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Old 02-01-2016, 5:46 PM
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169.8875 / NAC 653 / encrypted voice
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Old 02-01-2016, 5:58 PM
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One of the 5 sets Federal IO's for San Francisco (DOJ 25 Cities)

This Set of IO's are 4 Synch'd Pairs all using $653
SF FED IO - ET, ES, EW and ED (no idea what those reference, thoughts ?)

ET - 169.6375
ES - 169.8875
EW - 170.3750
ED - 170.5625


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169.8875 / NAC 653 / encrypted voice
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Old 02-02-2016, 9:30 PM
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Quote:
Originally Posted by ecps92 View Post
One of the 5 sets Federal IO's for San Francisco (DOJ 25 Cities)

This Set of IO's are 4 Synch'd Pairs all using $653
SF FED IO - ET, ES, EW and ED (no idea what those reference, thoughts ?)

ET - 169.6375
ES - 169.8875
EW - 170.3750
ED - 170.5625
What is an IO?
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Old 02-03-2016, 12:18 AM
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Quote:
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What is an IO?
These are part of the "25 Cities Project - Federal Interoperability Channels" for San Francisco. The channels he listed are p25 VHF Multicast voted system. The IFOG manual doesn't describe these, but I suspect the two letter designator might indicate the site or the specific user/channel. There is some mention in IFOG about getting permission from the FBI before programming them.

IO = Interoperability.

I don't think you'll hear much on these since they are designed for covering the San Francisco city area. Santa Clara is going to be too far south for these to be really useful, although it's certainly possible that they could get used.

Last edited by mmckenna; 02-03-2016 at 12:32 AM..
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Old 02-03-2016, 6:24 AM
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Inter-Operability, many times just listed as IO for Inter Op and/or FIO for Federal Inter-Op

Originally implemented as part of a DOJ 25 Cities InterOp
Boston was originally implemented before this using a VHF USCG Pair, used for the LNG Tanker Escorts, then moved to an FBI (Analog, then P25) FBI Patch from our T-Band Mutual Aid, now it's LE4 and LE10, with Boston Patching into their UHF and VHF (Part 90) and during events our SWIC and COML/COMT's patch as needed

The 25 Cities include: Some VHF, Some UHF, some on trunked systems:
Atlanta, Baltimore, Boston, Chicago, Detroit, DFW, Denver, El Paso, Connecticut, Honalulu, Houston, Jacksonville, Los Angeles, Miami, Minneapolis/StPaul, NYC/NJ Area, Hampton Roads, New Orleans, Oklahoma City, Orlando, Philadelphia, Richmond, San Francisco, St Louis, Tampa, DC,

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What is an IO?
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Old 02-03-2016, 7:48 PM
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Thank you gentlemen, I'm familiar with the project. I don't always remember the acronyms and abbreviations for everything.
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