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Re: Tek 492 SA experts, can you answer these questions?
arthurok
you might be able to just take the "video" output from the detector and run it into an audio amp
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for fm just demodulate it by slope detection "tune off peak and use a fairly narrow filter" ----- Original Message -----
From: Chris Johnson To: TekScopes@... Sent: Sunday, February 04, 2007 2:05 PM Subject: [TekScopes] Tek 492 SA experts, can you answer these questions? I'm learning my way around the 492 and don't yet have manuals for it. (I'd rather get print manuals than a CD copy...got a set for sale?) I'd like to be able to use the 492 as a receiver for AM and FM transmissions, to be able to hear them. My 492 has options 1,2, and 3, so the only IF option I have to work with is the 10 MHz IF output. I need to know what are the output specs for the IF output, so I can determine how much gain I'm going to need. I plan to preamplify the IF output, feed it through a detector/demodulator, and then need to add more gain to bring it up to a level suitable for further processing, including audio band filtering and level adjustment. I would PRESUME that the correct mode to run in will be zero span, is this right? Not having actually used an analyzer in this application before, I'd appreciate it if anyone could give me a how-to guide on the setup and configuration of the analyzer and outboard equipment. If I'm wrong about how to do it, I'd rather know before I get started. CJ |
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Re: Tek 492 SA experts, can you answer these questions?
arthurok
deane kidd might have the paper manuals
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----- Original Message -----
From: John Miles To: TekScopes@... Sent: Sunday, February 04, 2007 2:29 PM Subject: RE: [TekScopes] Tek 492 SA experts, can you answer these questions? I haven't messed with the 10 MHz output, but try feeding it into a general-coverage receiver and see what the levels are like. Zero span will definitely be needed. For paper manuals, QService is great -- they are in Greece but they ship quickly, and the quality level is essentially OEM-grade. Go here: and enter 492 into the store search field. Make sure the serial # range matches yours (the major editions are either pre-B030000 or post-B030000). Can't say enough good things about the reprints I've ordered from them. -- john, KE5FX > -----Original Message----- > From: TekScopes@... [mailto:TekScopes@...]On > Behalf Of Chris Johnson > Sent: Sunday, February 04, 2007 12:06 PM > To: TekScopes@... > Subject: [TekScopes] Tek 492 SA experts, can you answer these questions? > > > I'm learning my way around the 492 and don't yet have manuals for it. > (I'd rather get print manuals than a CD copy...got a set for sale?) > > |
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Re: Tek 528 Waveform monitor, what is it?
Chris Johnson
As it's strictly for monitoring NTSC standard video signals only, and
can't be used for high definition signals at all, it's of little use and will only become less useful as time goes on. Only those who have a need to test legacy NTSC video systems will find it useful. |
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Tek 576 vs 577
J Forster
Basically, the 576 is 7000 technology, the 577 is 5000.
The 576 is bigger, MUCH heavier, and capable of more test current. The 577 has opamp and voltage regulator test fixtures which (I think) the 576 lacks. Either is a fine choice IMO. -John Hello! After some time looking around, I have finally bought a 577/D1 curve tracer with the standard 177 fixture. I wonder which are the differences with the more expensive 576. What would I be missing? Regards, JOSE |
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Tek 576 vs 577
Jose V. Gavila
Hello!
After some time looking around, I have finally bought a 577/D1 curve tracer with the standard 177 fixture. I wonder which are the differences with the more expensive 576. What would I be missing? Regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) - Loc: IM99SM Vintage Radio: Vintage Test Equipment: European Boatanchors List: |
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Re: Tek 528 Waveform monitor, what is it?
Tomas Larsson
Ok, thanks.
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I thought it was something like that, obviously not that useful instument, unless you are doing video then. With best regards Tomas Larsson Sweden Excellent and cheap hosting, use Verus Amicus Est Tamquam Alter Idem -----Original Message-----__________________________________________________ Anv?nder du Yahoo!? ?r du tr?tt p? spam? Yahoo! E-post har det b?sta spamskyddet som finns |
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Tek 528 Waveform monitor, what is it?
J Forster
"Tomas Larsson" wrote:
Hi group. Stumbled across a Tek 528 Waveform monitor. What is it, and what was it's primary use? Cant find any info more than pic's. With best regards Tomas Larsson Sweden It's basically a specialized scope for looking at TV signals. It is likely NTSC but I think other versions (PAL and SECAM) were made. Triggering is from an internal TV sync separator and the graticle is likely an IRE scale. There are filters in the vertical channel so you can look at the full signal, luminance, and chrominance (wideband, LP, 3.58 BP). -John |
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Re: Tek 528 Waveform monitor, what is it?
Bill R
Tomas,
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It was used by TV stations to monitor video waveforms. Made in NTSC and PAL versions, I think. Bill Roberts Tomas Larsson wrote: Hi group. |
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Re: Tek 528 Waveform monitor, what is it?
Tomas
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The Tektronix 528 waveform monitor is used in the TV industry to monitor the video waveform. The scope is graduated in IRE. A proper waveform will have 100 IRE of video and 40 IRE of sync. The scope can display two frames of video (what we normally leave ours set at) or a single frame of video. You can use the scope to tell if the video frequency response of the device that the scope is monitoring is correct. It gives an indication of the chroma level. The only use I know of for the scope is to monitor video. The scope is fairly old. The CRT is unique to this scope. I work at a TV station and use different vintage waveform monitors at the station. Hopefully all that I have stated is true for this monitor. Some waveform monitors allow you to view a single line of video. 73 Glenn WB4UIV At 03:28 PM 02/04/07, Tomas Larsson wrote:
Hi group. |
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Re: Tek 492 SA experts, can you answer these questions?
John Miles
I haven't messed with the 10 MHz output, but try feeding it into a
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general-coverage receiver and see what the levels are like. Zero span will definitely be needed. For paper manuals, QService is great -- they are in Greece but they ship quickly, and the quality level is essentially OEM-grade. Go here: and enter 492 into the store search field. Make sure the serial # range matches yours (the major editions are either pre-B030000 or post-B030000). Can't say enough good things about the reprints I've ordered from them. -- john, KE5FX -----Original Message----- |
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Re: old fashioned 535 - first start after 35 years
Artek Media
Michael
For starters , do a search in the Tekscopes archives for a a long email thread on washing and baking old scopes to get the grime out . It may be as far back as two years ago but there was a lot of discussion. Next I would carefully remove and mark the locations of all the tubes, find a friend with a tube tester and test all the tubes ... Once you have a clean dry scope and a good set of tubes time to start tracing the circuits for bad electrolytic.. Many will suggest that you just replace them all :-) Does the filament on the CRT glow ? If that is dead ...you may be out of business till you find a doaner scope Good luck and HAVE FUN Dave At 02:02 PM 2/4/2007, Michael Petereit wrote: Hi,Dave & Lynn Henderson ArtekMedia Digitally remastered "out of print" test equipment manuals www.ArtekMedia.com manuals@... 952-807-5484 |
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Tek 492 SA experts, can you answer these questions?
Chris Johnson
I'm learning my way around the 492 and don't yet have manuals for it.
(I'd rather get print manuals than a CD copy...got a set for sale?) I'd like to be able to use the 492 as a receiver for AM and FM transmissions, to be able to hear them. My 492 has options 1,2, and 3, so the only IF option I have to work with is the 10 MHz IF output. I need to know what are the output specs for the IF output, so I can determine how much gain I'm going to need. I plan to preamplify the IF output, feed it through a detector/demodulator, and then need to add more gain to bring it up to a level suitable for further processing, including audio band filtering and level adjustment. I would PRESUME that the correct mode to run in will be zero span, is this right? Not having actually used an analyzer in this application before, I'd appreciate it if anyone could give me a how-to guide on the setup and configuration of the analyzer and outboard equipment. If I'm wrong about how to do it, I'd rather know before I get started. CJ |
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old fashioned 535 - first start after 35 years
Michael Petereit
Hi,
now I finished the repair of this pretty old scope. I switched on and was afraid of getting "flames" out of it. This didn't happen but even after 10 minutes running no beam appeared on the tube. Since the servicemanual describe resistors and capacitors with it's number within the system the reality looks different. I cannot measure neither 9kv voltage nor I can find the correct part cause the scope is pretty dirty inside. Any hints where to look first ? Thanks, Michael |
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Photo captioning contest and trip report
Hi everyone,
Thanks to all of you who responded to the photo captioning challenge. I have decided to award BOTH prizes, first place gets their choice and second gets the other. One prize was a new set of 1x-10x probes and the other was a copy of the 30 minute Tektronix movie " A World of Measurements" on DVD. When I get home in a week I will get my wife to pick the two best and let everyone know. I plan to run this challenge frequently, so if you have a picture begging for a caption email it to tekstore@... and I may use it. I may add a prize for pictures used too. We are still in California having a good time and not shovelling snow! We are in San Jose now, after 2 weeks in LA. I have filled the car up with more scopes than it can hold. A 545B, a 564, an 11801, a DSA602A and an 11401 so far. If you see a couple of suitcases on the side of the freeway, it means I found one more! LOL I was able to visit Deane Kidd's fabulous parts depot (Thanks Deane) and enjoy Dennis Tillman's hospitality. Julian Bunn gave us a nice tour at Caltech and bought lunch. And yes Julian, we did get on the tour at JPL. Unfortunately we do have to return home to the cold and rain. My thanks to all those who have tried to contact me or bought stuff from our store while we are away. I plan to include a bonus with each item that you have been waiting patiently for when I ship in about 1 week. Enjoy the Superbowl. This is the first time I will see it from a US location. Neat! Larry Christopher www.theoscilloscopestore.com |
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SC 501 sync
Jerry Massengale
Greetings,
I have an SC501 that has poor sync. The unit works better at Usec settings than Millisec settings. I can swap U200 with a unit that works good and see no improvement. I can set 2 units side by side on extenders and compare voltages and waveforms and not see anything suspicously different between the two. One is stable and locked, the other is very, very, close but not stable. When the sync on the bad unit is at it's most stable point, the blanking output slows dramatically and the screen flickers. The power supply voltages are good with no apparent ripple. The Msec timing cap, C230 measures the same on both units(0.987uf and 1.02uf). I am attaching the schematic for the U200 circuit. Suggestions are welcome. I would love to see a datasheet for U200. It is a Tektronix made IC, pn 0155-0055-00. Jerry |
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Re: 2445A big furry trace
--- In TekScopes@..., "mobyxena" <moby@...> wrote:
half an inch wide. The focus knob doesn't do much. All the other controlsCheck zener diode VR1891 and cap C1890, both on A9 High Voltage board. Voltage at pin 8 of the CRT (= pin 9 of P901) should be around +30 volts. /Hakan |
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Re: Birdies on a 492....what's normal?
arthurok
the birdies were coming from broadcast stations
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buy some 10 db n type attenuators from ebay and put them between the gen and 492 deane kidd might have some too ----- Original Message -----
From: Chris Johnson To: TekScopes@... Sent: Saturday, February 03, 2007 11:05 AM Subject: [TekScopes] Re: Birdies on a 492....what's normal? I'm still learning my way around the groups. I may have sent replies to individuals rather than the group. Sorry about that. I went inside and checked all the cabling and found a few connections that were a bit loose. Most of them were push-on SMB connections. After tightening them all up, all the birdies flew away. :) My 492 has mod UB and kit KE/FE installed. Would you happen to know what those are? What's the lowest power signal that this should be able to resolve at minimum span, max resolution, and with the minimum noise filter engaged and with video filtering set to narrow? I'm asking because whatever it is, my HP 8640B won't go that low, even at its -130dBM range with the vernier turned down all the way. I'm impressed! CJ |
zenith5106
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