4737.4

[brandon]

I stumbled across some interesting traffic on 4737.4 kHz this past Sunday afternoon. I heard 0301 calling 9701 Atlas to give them a heads up they did their AAV2 w/ Warship 69 and currently engaged w/ 0302 Warship 38. Later 0301 was talking to a station that identified as 120. They refer to this channel as Tac 4.

I also logged this frequency during the summer and heard phrases such as "Red Coast Guard" and "Red Territorial Waters". Both times monitored was during daylight hours so probably coming from the offshore SoCal area.

 

[w8jjr]

I stumbled across some interesting traffic on 4737.4 kHz this past Sunday afternoon. I heard 0301 calling 9701 Atlas to give them a heads up they did their AAV2 w/ Warship 69 and currently engaged w/ 0302 Warship 38. Later 0301 was talking to a station that identified as 120. They refer to this channel as Tac 4.

I also logged this frequency during the summer and heard phrases such as "Red Coast Guard" and "Red Territorial Waters". Both times monitored was during daylight hours so probably coming from the offshore SoCal area.

DEA has been known to use that freq

 

[brandon]

By the way this frequency is still active on a regular basis. The callsigns are vessels such as ATLS 9701 (drone launch ship), CAW-1 (Center for Asymmetric Warfare fast patrol craft) and SL-120 (likely the Swiss Ladder 120). There are others but I haven't had time to research, but they can be tracked on AIS ship tracking site MarineTraffic.com. They frequently operate offshore SoCal near San Clemente Island.

 

[SCPD]

Isn't that the Naval SpecWar center?

 

[brandon]

More activity this morning from Swiss Ladder Base, Caw-1 and other hard to identify station. Talked about live fire for tomorrow. Also gave reference to a channel called "fifty eighty", which is most likely 5080kHz for Plead Control. Could be interesting monitoring over the next 24 hours.

 

[brandon]

I can confirm that "fifty eighty" is indeed 5080kHz. Heard 0301 wkg SL 120 on that freq.
Both of them showing on AIS and appear to be headed to live fire area.

 

[mgolden2]

Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)

Do you have any recordings? Sounds very interesting

 

[brandon]

Do you have any recordings? Sounds very interesting

Here are a couple audio recordings.

Caw One wkg QST 0501
4737.4_Caw1_wkg_QST0501.mp3

Position of Warship 20 and Warship 45
4737.4_Warship_Position.mp3

There has also been traffic on 5080kHz from same vessels.

 

[TrenchFeeder]

Sounds like war games to me

 

[SCPD]

What time are the freqs active?

Brandon, I found this notice online:

(240828Z OCT 2010)
434/10(18).
EASTERN NORTH PACIFIC.
CALIFORNIA.
MISSILES.
1. INTERMITTENT MISSILE FIRING OPERATIONS 0001Z TO 2359Z
DAILY MONDAY THRU SUNDAY IN THE NAVAL AIR WARFARE CENTER
SEA RANGE. THE MAJORITY OF MISSILE FIRINGS TAKE PLACE
1400Z TO 2359Z AND 0001Z TO 0200Z DAILY MONDAY THRU FRIDAY
IN AREA BOUND BY
34-02N 119-04W, 33-52N 119-06W, 33-29N 118-37W,
33-20N 118-37W, 32-11N 120-16W, 31-54N 121-35W,
35-09N 123-39W, 35-29N 123-00W, 35-57N 121-32W,
34-04N 119-04W.
2. VESSELS MAY BE REQUESTED TO ALTER COURSE WITHIN THE ABOVE
AREA DUE TO FIRING OPERATIONS AND ARE REQUESTED TO CONTACT
PLEAD CONTROL ON 5081.5 MHZ (5080 KHZ) OR 3238.5 KHZ (3237 KHZ)
SECONDARY OR 156.8 MHZ (CH 16) OR 127.55 MHZ BEFORE ENTERING
THE ABOVE BOUNDARIES AND MAINTAIN CONTINUOUS GUARD WHILE
WITHIN THE RANGE.
3. VESSELS INBOUND AND OUTBOUND FOR SOUTHERN CALIFORNIA PORTS
WILL CREATE THE LEAST INTERFERENCE TO FIRING OPERATIONS
DURING THE SPECIFIC PERIODS, AS WELL AS ENHANCE THE VESSEL'S
Messages in force 281230Z October 2010:
2010 series 424(18) 431(GEN) 434(18)
403(19) 430(19) 433(19) 435(18,83)
NM 45/10 SECTION III
III-1.8
SAFETY WHEN PASSING THROUGH THE VICINITY OF THE SEA RANGE
IF THEY WILL TRANSIT VIA THE SANTA BARBARA CHANNEL AND WITHIN
NINE MILES OFFSHORE VICINITY OF POINT MUGU OR CROSS THE AREA
SOUTHWEST OF SAN NICOLAS ISLAND BETWEEN SUNSET AND SUNRISE.
4. CANCEL NAVAREA XII 427/10.
(251001Z OCT 2010)

 

[brandon]

During local daytime here in California. They were operating in that general area, so that could very well be it.

 

[mancow]

Don't know if it's related but there are similar comms right now on 4.739 usb.