Test pattern?

[Jeffhs]

Originally Posted by W.B.

Turns out that the second one in order on this post was the earliest known variant. One other TV station is confirmed to have used it: KYW-TV itself, during its last full year (1964) in Cleveland while Westinghouse Broadcasting (Group W) owned the station.


And the other zigzag wedge dated at the earliest to 1965:

Cleveland's NBC affiliate, WKYC-TV on channel 3, used a test pattern similar to this one when the station was an NBC O&O in the '60s-early '70s, showing the NBC "snake" logo in the lower right corner; the station may have kept the same test pattern, with few if any modifications, until it went to 24-hour operations. The call sign and channel number were in the top left corner of the test pattern; however, to the best of my knowledge, the black and white wedge was never used, even after the station was sold from NBC to a local company in the mid-'70s.

[W.B.]

The first of those early TP's (with the zig-zag black/white wedge at bottom right) was also used (albeit represented in B&W) by WBOC-TV in Salisbury, MD.

By the mid-1970's, WKYC switched to electronic color bars, and NBC didn't unload it until the mid-'80's.