KNBR (AM 680) Antenna, Redwood City, CA, 2024
Very tall pixels at https://www.flickr.com/photos/mattblaze/54131419266
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this post was submitted on 13 Nov 2024
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@mattblaze@federate.social oh that's a funky antenna! Most AM antennas aren't that intricate.
Apparently that's a "pseudo Franklin" design (I'd call it more like a collinear) with a capacity hat.
KFBK Sacramento has the only true Franklin antenna design on an AM station in the USA and it's reeeeeally funky looking. It does with two towers what some more conventional AM directionals take four to EIGHT to accomplish. It's kinda boss.
@vxo@digipres.club Yeah, KFBK is on 1530, making it at least possible to build a full Franklin antenna (2 half wave verticals stacked atop each other - a full wavelength!)
@mattblaze@federate.social I wonder if the original Ampliphase development/test transmitter is still there. It's my understanding that their daily driver is a Nautel
@vxo@digipres.club Wait, which station? KNBR is (according to their license) a Gates.
@mattblaze@federate.social oh I was talking about KFBK. At least as of 2009, a Nautel (not sure what model but the front panel reminds me of the V series?), a Harris DX50, and the RCA Ampliphase TX appeared to live there.
https://www.youtube.com/watch?v=97F9TO0yBNU
@vxo@digipres.club Neat!