I have a technical question concerning the production of the digital TV signal at the front end of the transmitter circuitry. I noticed that 10MHZ GPS timebase signal that the circuitry uses for the timing. What would be the result if, what ever reason, that signal was lost? Would that cause the loss of the transmitter's signal?
This is used as a baseline reference for the exciter's pilot frequency generator. If it is lost, it will switch over to an internal frequency generator, which is pretty accurate, but not a NIST-traceable source like GPS. Some stations that used to be adjacent to an analog transmitter on a lower channel were required to have very precise pilot frequencies to keep interference to a minimum. I don't think any of the old requirements apply now, so this would be obsolete. In modern exciters made in the last 5 years, they really don't have any issues keeping the frequency dead on. Only the very early digital exciters really had problems with drift. (You are still required to check it to make sure it is within spec.)
The on line engineer my hobbys are painting pictures and lisining to shortwave and ssb iam thinking about getting my ham license I have 4 shortwave receivers
Thank you for posting all these videos. Much appreciated 😊
I have a technical question concerning the production of the digital TV signal at the front end of the transmitter circuitry. I noticed that 10MHZ GPS timebase signal that the circuitry uses for the timing. What would be the result if, what ever reason, that signal was lost? Would that cause the loss of the transmitter's signal?
Based on other questions asked from years ago , I don't think the creator answers questions.
This is used as a baseline reference for the exciter's pilot frequency generator. If it is lost, it will switch over to an internal frequency generator, which is pretty accurate, but not a NIST-traceable source like GPS. Some stations that used to be adjacent to an analog transmitter on a lower channel were required to have very precise pilot frequencies to keep interference to a minimum. I don't think any of the old requirements apply now, so this would be obsolete. In modern exciters made in the last 5 years, they really don't have any issues keeping the frequency dead on. Only the very early digital exciters really had problems with drift. (You are still required to check it to make sure it is within spec.)
Where are the rest of the parts?
The on line engineer I like your utube videos
Where are next parts?
does this mean if we lost the GPS sat's a bunch of tv transmitters would go down?
Thanks for a very informative video!
Have you seen any klystron DTV transmitters? I know that are some broadcasters who have refitted their klystron PAs for DTV use.
The on line engineer me and my cousin are going to a Swap meet in September 11 Sunday morning at 8 am in Milwaukee 2022
Excellent video but the music is jarringly loud compared to the narration and really annoying when repeated over and over.
Why not use a 10 MHz crystal on the Ref signal?
The on line engineer my hobbys are painting pictures and lisining to shortwave and ssb iam thinking about getting my ham license I have 4 shortwave receivers
Does not show anything, it's so blurry
Too much technical jargon, not well explained not well recorded, i hope you make a better engineer
I couldn't tolerate any more than 4 minutes