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Forum Free Registration Closed
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
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Workshop Workshop Test Signals
Since work finished on my workshop back in November of last year, one thing I had neglected to sort out were my bench test signals. The rack I had before had been pulled apart and basically while working on a TV, I have to pull out the IMOGen or disconnect that and hook up the PM5509. A bit of a faff each time I wanted to switch from one to the other.
Today I finally got my finger out and connected everything up, so I have one RF cable to the bench with two combined signals, I can tune to 30 for the PM5509 & tone, and 56 for IMOGen/ Test card music. I'm monitoring the signals via a 5" Sony monitoring the PM5509 output, a 10" covering the IMOGen output, and finally a 5" TV for monitoring the RF signal.
OK, its hardly neat and I should probably make a box to house it all. I probably also need to go around and terminate a few connections, but for now it's a lot better than I've had of late.
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Either the burst is small or the syncs are big on that set of bars, Chris!
IIRC the "white" bar is in fact at 75% amplitude from a 5509 - so 525mV rather than 700mV?
Hi Mike,
I must admit that last time this 528A was hooked up it was with the much newer PM5515, this is the first time I've used the PM5509 and hooked it up to the waveform monitor.
This is your domain Mike, as a layman I thought a colour bar is a colour, is a colour bar, I no idea there were all these implementations of it, why would I. As such, I'm not familiar with what I should be exactly seeing on the waveform monitor,
The PM5509 Colour Bar has the White Horizontal bar across the colour bar
This is the Courtyard CY420; "EBU ColourBar" (for those wondering, European Broadcasting Union, by the looks, an additional white bar at end?) selected, unlike the Philips on the Courtyard I can select 100%, 95% and 75%. Photo #2, top is PM5509 and below on the monitor EBU colour bar.
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Posted by: @crustytvThis is the Courtyard CY420; "EBU ColourBar" (for those wondering, European Broadcasting Union, by the looks, an additional white bar at end?) selected
Not quite, Chris.
EBU bars are described as 100.0.75.0 bars - that is, 100% luminance but only 75% saturation, which is why they have a 'dirty' look to them. You'll also note that the chroma doesn't go above peak white. 'BBC' bars - those on Test Card - were 100.0.100.25, which meant the chroma didn't go below black but were only 95% saturated.
The extra white bar after black was AFAIK a BBC 'mod' originally carried out to their colour bar generators so that the signal would show you where blanking started and stopped - otherwise with the black at the end of the sequence you'd not notice it. It looks like Courtyard adopted it 🙂
The display on the 528 from the Courtyard is *exactly* as I would hope to see (700mV of white, tip of green bar *just* touching black level), which does make me think there are "problems" with the 5509's output.
How nice to see a 528A in action again, a workhorse of the broadcast industry from Tektronix' glory years before the mechanical construction aspect got seriously pared down. I reckon you should try to get hold of its contemporary partner vectorscope, the 1421, then you'll have an excuse to throw the word "goniometer" into conversations.... I do regret not getting examples of these and something like a Tek or GVG TSG at the time that they were being cleared out en masse, but it was at a time when I was trying to clear "stuff" out of my life, rather than acquire more!
Posted by: @turretslugHow nice to see a 528A in action again, a workhorse of the broadcast industry from Tektronix' glory years before the mechanical construction aspect got seriously pared down. I reckon you should try to get hold of its contemporary partner vectorscope, the 1421, then you'll have an excuse to throw the word "goniometer" into conversations.... I do regret not getting examples of these and something like a Tek or GVG TSG at the time that they were being cleared out en masse, but it was at a time when I was trying to clear "stuff" out of my life, rather than acquire more!
Might be able to help you out there....
Posted by: @turretslugI reckon you should try to get hold of its contemporary partner vectorscope, the 1421, then you'll have an excuse to throw the word "goniometer" into conversations....
I do have a 1421, unfortunately its internal sub carrier has a fault, I've never been able to get it to lock up or find the fault. I bought the Courtyard to provide the 1421 with an ext sub, but I couldn't get that to work with it either. Utter failure, I know. The vectorscope would have come in handy when I get to the G6 decoder alignment, I'll just have to settle with the oscilloscope.
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@cathovisor Thanks for the thought, but I can't honestly say that I "need" a 528A (or a 1421!), in the end a 528A is a specialist 'scope in effect with limited utility for anything else, a 1421 is an unusual and even more specialist device that would only be "interesting clutter" of which I have enough as it is! As long as there are a few still around for posterity. I suppose a 1781R with probe option would be the ultimate plaything in this field, comprehensive but complex. From the few that I worked on, I recall that the "cleverness" was pretty reliable but PSU/EHT problems were starting to show up with age.
@crustytv I'm reminded now of the 1421 vectorscope post that you did now, thanks for that pointer. I even commented on it at the time! I guess that the grey matter doesn't cling onto everything nowadays.
Posted by: @turretslugI guess that the grey matter doesn't cling onto everything nowadays.
Ha, Haa, Like a greyscale, It starts out strong at one end, and fades out to white at the other!
Fade To Grey. . . . . .
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