2015_04_05_ewr-sfo_308 - a photo on Flickriver

2015_04_05_ewr-sfo_308

Photos of the KNBR/680 transmitter site, on a salt swamp alongside San Francisco Bay, in Redwood Shores, California. KNBR is one of the original "clear channel" stations in the U.S., meaning the alpha occupant of its channel. When I was a kid I could get KNBR at my home in New Jersey on some nights,

The station's transmitting system is somewhat unusual, with a "sectionalized" 550-foot tower with the two sections fed separately, giving the signal extra punch, with two antennas working in parallel to push the signal outward toward the horizon. The upper section of the tower also features a "capacitive hat" increasing the electrical length of the radiator.

KNBR started as KPO in 1922 and was KNBC for awhile.

This tower was built in 1949, and replaced a flat-top "T" or "clothesline" antenna suspended between two towers. (See here.) One of those towers still stands as a backup antenna. The base of the other is still visible. The four red "HAZ" signs on the ground tell airplanes there is a HAZard in the middle.

Also at this site are the tower bases for shortwave station KGEI, which operated here until 1994.

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Taken on: April 5, 2015

Tags:

2015_04_05

ewr-sfo

KNBR/680

radio

transmitter

transmission

antenna

towers

broadcasting

Redwood Shores

San Francisco Bay

aerial

windowseat

windowshot

green

swamp

sea water

slough

transmitter site « less

Sets appears in: • The KNBR/680 Collection • 2015_04_05 KNBR site

Camera: Canon EOS 5D, f/5.6, 1/500 sec, 105mm, ISO 320 (more info) (hide info)

Camera:	Canon EOS 5D
Lens:	EF24-105mm f/4L IS USM
Aperture:	f/5.6
Exposure Time:	0.002 sec (1/500)
Focal Length:	105mm
ISO:	320
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Shutter speed priority AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	sRGB
Software:	Adobe Photoshop CS6 (Macintosh)
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