Rodenstock 50mm/4.0 HR Digaron-W lens (@ f/6.3), Phase One IQ4-150 digital back, Cambo 1250 camera (vertically shifted -23mm).
This simple photo pushed the 50mm lens to the limits of its image circle with the large shift required to keep the tall antenna mast fully in the frame while maintaining its geometry. Hard vignetting of the upper corners was visible in the full sensor image, but fortunately the composition benefited from a narrower aspect ratio that cropped out the blackened corners.
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Matt Blaze
In response to this postKNBR is a 50KW "Class A" (formerly "clear channel") mediumwave (AM) rado station broadcasting on 680 KHz, serving the San Francisco Bay area (and, at night, most of the west coast of the US). Opened in 1922, It was originally known as KPO, (later KNBC, and still later KNBR), and soon became the flagship station for the National Broadcasting Company (NBC)'s new western radio network. It is currently owned by Cumulus Media and now broadcasts a sports format.
Mediumwave (AM) broadcast radio uses lower frequencies than other modern broadcasting and so requires much larger antennas (generally getting larger and larger as the frequency gets lower on the dial). This often entails highly customized antenna designs engineered for the particular site and station frequencies. For most radio stations (FM, TV, etc), the towers are there simply to get the relatively small antennas up high, but for AM stations like KNBR, the towers generally ARE the antennas.
by Matt Blaze ;
@mattblaze St. Louis has one and it has been in continuous operation since 1925 (KMOX).
by JamieGC 🏴 🏳️🌈 🖖 ;
@mattblaze Back in 2010, this was KNBR's main transmitter. No pictures of the towers because it was dark when I visited (lots of pictures of the obstruction lighting but I didn't have a tripod and can't handhold nighttime photography worth a damn). This must have been installed some time in the 1990s (it would be a newer model from the 2000s and probably a Nautel instead of a Harris if it had been actually new at the time of my visit).
by Garrett Wollman ;
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Laffy
In response to this post@mattblaze Matt, I moved to a new instance. FYI. I do follow you from there.
@GottaLaff I saw!
by Matt Blaze ;
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