San Bruno Mountain (Building 7)

San Bruno Ham Tower

Site located on San Bruno Mountain. Near the KTSF transmitter (map)(photos)

Site Details

Tower has a 4° slope. All equipment must be mounded on galvanized supports which are themselves attached to the tower using beam clamps. Cabling must be run with beam camps and stainless steel zip ties and cannot be directly attached to the tower. Cables run into the shack via rubber "grommets" (not the plastic tube!). All current mounting brackets should be considered unusable. Cable loops are discouraged, as is excessive cable in the shack.

The site provide main power (without backup) as well as 24vdc, 12vdc and -24vdc (breakers not provided) with battery backup.

Configuration

Currently the site has an Mikrotik hAP, a Ubiquiti NSM5 (bearing 236° toward Colma), a Ubiquiti Rocket M5 + 120 degree sector antenna (bearing 160° toward Millbrae), a Ubiquiti EdgePoint R6 switch, and a Ubiquiti AirFiber dish pointing at Fish Ranch.

Devices

Device	IP	Notes
EdgePoint R6	(AREDN LAN)
airFiber 5XHD	(AREDN LAN)	to Fish Ranch

VLANs

VLAN	Description
1	AREDN WAN
2	AREDN DtD
100	AREDN LAN

EdgePoint R6

Port	Description	VLANs	PoE	Notes
0	(not connected)	1, 2, (100)	Off	DHCP on VLAN1
1	W2GMD-SANBRUNO-NSM5	1, 2, (100)	24v
2	W2GMD-SANBRUNO-RM5	1, 2, (100)	24v
3	DISH-TO-FISHRANCH	1, 2, (100)	Off
4	W2GMD-SANBRUNO-HAP	1, 2, (100)	Off
5	(unused)		Off

hAP

Port	Description	VLANs	Notes
1		(1)	WAN
2			LAN
3			LAN
4			LAN
5	EdgePoint R6	(LAN), 2	DtD

Notes

Part of the Bay Area Backbone connecting to Fish Ranch.

Plans

• Phase 1
  • Add a rack shelf
  • Move the hAP onto the rack shelf
  • Replace the R6 with a UISP router on shelf
  • Remove any injectors
  • Add 24vdc/5a breaker
  • Run new power cabling to hAP & router from 24v system
  • Run a wifi scan at the proposed antenna mount point to see how noisy it is.
• Phase 2
  • Add galvanized support for new radios to tower
  • Add airFiber link to San Carlos
  • Reposition W2GMD-SANBRUNO-RM5 to point at Daly City
  • Replace W2GMD-SANBRUNO-NSM5 with Rocket + Sector Antenna
  • Reposition airFiber link to Fish Ranch for optimal signal strength

Nodes

On axis view from antenna

DISH-TO-FISHRANCH

Radio: airFiber 5XHD

Frequency: 5.99 GHz (Unlicensed use - FCC note)

Bandwidth: 60 MHz

Antenna: Ubiquiti RD-5G30-LW 30 dBi

Location: 37.68678, -122.43527

Altitude: 400m

Bearing: 56° toward Oakland

W2GMD-SANBRUNO-HAP

Radio: Mikrotik hAP

Antenna: -

Location: Inside the HAM Shack

Altitude: -

Bearing: -

On axis view from antenna

W2GMD-SANBRUNO-RM5

Radio: Ubiquiti Rocket M5

Antenna: 120 degree sector

Location: 37.68674, -122.43525

Altitude: 387m

Bearing: 159° toward Millbrae

On axis view from antenna

W2GMD-SANBRUNO-NSM5

Radio: Ubiquiti NanoStation M5

Antenna: Build in

Location: 37.68673, -122.43532

Altitude: 392m

Bearing: 236° toward Colma

Coordination

The San Bruno Mountain HAM site is own and managed by Matthew Kaufman as part of the WB6ECE Repeater Group. Coordination of changes to the site (e.g. new radios) is managed on the mailing list Sbruno_shack. Unfortunately this is an invite only group with no public archives.

Commercial Neighbors

The local WISP in this area is Etheric although they use a different tower. They license (WQTV709) spectrum from 11.2 GHz to 11.7 GHz.

Contacts

• Tim Wilkinson - KN6PLV - tim@sfwem.net
• Steve Ligtelyn - steve@tcomeng.com
• Matthew Kaufman - KA6SQG - matthew@eeph.com