Tektronix Type 526 Vectorscope 1966 composite video test - Page 1
Forum section: electronics / testgear

author: oz2cpu
author_rank: Frequent Contributor
timestamp: July 29, 2024, 04:01:29 pm
content: I scored an old Tektronix 526 TV vector scope, almost all tube based, 53 tubes and ONE transistor,I managed to get it working,I made a little video about it, if you like to see it ;https://youtu.be/JLpGkpkU7uMby the way a long time since i posted on this forum, I had the idea it was broken some how,all things looks terrible, wierd and very different ?can this be repaired ??

author: RAPo
author_rank: Super Contributor
timestamp: July 29, 2024, 06:44:25 pm
content: I always start a working day with your video. This one was a delight. Somehow, you seemed happier in this video (the bye-bye at the end was very cheerful).

author: oz2cpu
author_rank: Frequent Contributor
timestamp: July 30, 2024, 08:49:16 am
content: thanks a lot, such a kind reply, YES i was very happy to get this one workingI always wanted to have a vector scope for video signals

author: tautech
author_rank: Super Contributor
timestamp: July 30, 2024, 08:52:33 am
content: Quote from: oz2cpu on July 30, 2024, 08:49:16 amAnd SDS2000X Plus and 2 Zone triggers won't let you see what you want ?

author: wasedadoc
author_rank: Super Contributor
timestamp: July 30, 2024, 09:58:41 am
content: Quote from: tautech on July 30, 2024, 08:52:33 amUnless that scope has a phase locked loop able to generate a stable 4.43361875 MHz from the swinging colour burst and use it in two balanced demodulators, no.

author: oz2cpu
author_rank: Frequent Contributor
timestamp: July 31, 2024, 08:08:12 am
content: YES tautech, my TDS2204 is a super scope, and it contain all the nice video triggers,so it is a lot better over any other scope i have when it come to composite video,it just dont do anything with the colorburst, its phase or its vectors to a colorbar signal.Fun fact : I may be the only one still working with composite video signals :-)so i am surprised and happy to see brand new scopes still support video triggers.and here is a full features frame line configured trigger on top of it :-)one cool feature i would LOVE to see : video demodulator mode, show the incomming picture on the screen live,this will remove one more item from my desk, a video monitor can then be thrown out.feature two : since I also own a Siglent generator SDG6022I should be able to capture exactly two fields of a colorbar test image, store that file, and then somehow transfer it to the generator,then make the generator playback the file, and bingo : now i can throw out my colorbar generator,Feature 3 : the scope also contain a generator, could that be used for playback ?

author: tautech
author_rank: Super Contributor
timestamp: July 31, 2024, 08:27:59 am
content: Quote from: oz2cpu on July 31, 2024, 08:08:12 amYou'll need EasyWave SW for this:https://int.siglent.com/upload_file/zip/software/Oscilloscope/EasyWaveX_1.1.0.23R11_EN.zipQuoteFrom SDS2000X Plus datasheet P15https://int.siglent.com/u_file/download/24_07_01/SDS2000X%20Plus_Datasheet_EN01D.pdfArbFrequency 1 μHz ～ 5 MHzWaveform memory16 kpts DDS memorySample rate 125 MSa/sWave import from EasyWaveX, from U-disk, directly from waveform data of analog channelsInternal AWG mem depth could be an issue for complex signals however SDG6000X should handle this with ease.

author: RAPo
author_rank: Super Contributor
timestamp: July 31, 2024, 09:16:09 am
content: Well, bring it on in a new video ;-)Quote from: oz2cpu on July 31, 2024, 08:08:12 am

author: wasedadoc
author_rank: Super Contributor
timestamp: July 31, 2024, 09:25:14 am
content: A static PAL picture with mathematically correct subcarrier repeats every 8 fields which is 160 ms. Sampling at 3 times subcarrier that is just over 2.1 Mpoints.