OK, I finally got off my butt and emailed the station too. I also copied station manager Regina Moon [email protected]
The following is my email:
I emailed the station several weeks ago via the KOTV.com website (HDTV and Satellite inquiries link) regarding problems I am experiencing using a MyHD MDP120 PC based HDTV receiver card. This HDTV receiver card is installed in a custom built multi-media PC, which is driving a $20,000.00 105MHZ bandwidth Ampro 3300 CRT projector, in my dedicated home theater media room. Needless to say, the image quality of this setup is nothing less than spectacular.
Beginning about two or maybe three months ago, I was no longer able to receive KOTV-HD signals via the MyHD card. I receive every other DTV station in the Tulsa market (at least the stations that I care to receive) without any difficulties. I can receive and lock into the KOTV signal, but the picture displays a black screen on 6-1, with no picture. No other DTV station in this market presents the issues that the KOTV signal presents. To reiterate, no other station presents the incompatibility issues with this card that KOTV does.
Further investigation into the nature of this issue on the websites http://www.hdtvok.org/
and the AVS forum https://www.avsforum.com/
has revealed many other Tulsans are experiencing the same KOTV reception issues as well. It turns out that this problem is found not only with the MyHD card, but with RCA and other set top box products as well.
Curiously, it appears to me that previous requests, from other station viewers for help from station engineering, was largely ignored. Specifically, the request to capture and transmit a clip of KOTV's transport stream (TS), for the purpose of allowing a technical representative of the MyHD card's manufacturer was never acknowledged. Thankfully, one of your fellow station engineers at KOKI was kind enough to help out and capture and transmit the TS needed to perform the diagnosis and evaluation of your signal and format.
The following is an excerpt of an email I have found on the AVSForum website, which was posted by another Tulsa viewer, which discusses the TS evaluation provided by Cliff Watson of Digital Connection (the major US distributor of this HDTV card), regarding your TS format problems:
"Anyway I've found some problems with the KOTV TS stream and I believe I know why the MyHD receiver/decoder can't render your stream.
Notice in the attach image that your stream actually has 3 PMTs. I have no idea what the "network" PMT is used for because I've never seen it in any other streams.
Look at the break down of the bit-rates from each PID and you will see that 0x0011 has a bit rate of 24.12 kbps meaning that progran 1 in the PAT/PMT tables does not have any video packets and I'm guessing that PID 0x0014 has no audio encoded either.
Program 2 from the tables does have the audio and video packets (based on bit rate) and is likely why you had to change PIDs to 0x0021 and 0x0024 on the scope. You also have a large amount (~6.5 Mpbs) of NUL packets (0x1fff) in the stream which is a waste of band width and reduces the video quality for HD.
A TS decoder can use one of two methods, 1) Use PAT/PMT tables to locate A/V PIDs or 2) Use the VCT from the PSIP. Notice that this TS only has a VCT for program 2 and none for program 1. Under this condition a STB receiver/decoder using VCT would default to reading program 2 where the actual content is located.
A receiver/decoder based on PAT/PMT would attempt to read the first program which in this case has no content explaining why the MyHD displays a blank screen and no audio. All receivers based on the Janus decoder chip would have the same problem with your stream.
Question: Are you attempting to broadcast two sub-channels from your station? Even if you are I would recommend that you move the primary HD sub channel to program 1 and additional sub channel to program 2."
It is my understanding that KOTV has not acknowledged and has still not provided any resolution to this issue. While I readily admit that I am not a broadcast engineer, I must conclude that your DTV signal is not being broadcasting in its proper format.
Can you please acknowledge my request for assistance, and let me know of your plan to correct this problem? I would think that you would want as many "happy viewers" in the market as possible. At this point, I am very disappointed by KOTV and my perceived lack of response to this troublesome problem.
I would appreciate your prompt response and resolution to this most frustrating issue.