There are color bars. And then there are extremely rare color bars, worthy of a post here.
https://www.youtube.com/watch?v=XjVbW29VvGg
You're probably asking, "What in the world is this?" It dates to March 9, 1994 and comes from a key chapter in the development of HDTV standards.
In 1994 and 1995, the Queen City was king for high-definition television. PBS conducted HD testing for the Grand Alliance DTV system (which became ATSC A/53, the core of the ATSC 1.0 standard).
A VHF and UHF transmitter were mounted on the old WPCQ-TV tower, which had been vacated when channel 36 carried out a signal upgrade in the late 80s. The two stations were WWHD channel 6 (10 kW in analog and 3.16 kW DTV) and WUHD on channel 53 (500 kW analog, 158 kW DTV). It is worth noting those are peak analog powers and the averages were quite low (page 12). Much like the WJW/31 ATSC 3.0 tests in Cleveland with ATSC 1.0, the Charlotte tests also included periodic analog transmissions to provide comparison.
Channel 6 did not do much testing, with the reason being cable ingress. Ironically, WCNC was on channel 6. When WWHD was operating, it created signal interference for cable subscribers, so its activity was curtailed.
While looking through old issues of the VHF-UHF Digest, I found a DX report, and then a picture, of WUHD. I had never heard of either of these stations, but the fact I wrote about it at the time is the reason why the uploader put this up!
This was what Eric Voytko of McLean, Virginia, experienced on July 31, 1995:
Eric managed to get a hold of WUHD's chief engineer, who promised to do more station IDs before tests ended in September. Eric ended up getting more than an hour of IDs on tape. The next year, the Photo News column of DX pictures featured what, until today, was the only pictorial evidence of the Charlotte HD tests:
Later that fall, ATSC A/53 was released, and the FCC adopted it the next year.
So I wrote my post in 2015, and in August 2016, someone came by and asked for more information, saying they had two minutes of WUHD's color bars on tape from 1994. (In fact, this was at the start of the test period. WUHD had just taken the callsign two weeks prior, having originally been assigned WAHA. The WWHD calls given to the VHF had previously been given to two earlier test facilities in Washington, on channel 58 in 1986 and channel 59 in 1988.)
He finally showed up with the video today.