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Spectrum Analyzer
David C. Hallam
I am looking for a good used spectrum analyzer and am not familiar with the
Tektronix line of equipment. I don't need the latest and greatest, but just a reliable unit that will cover the spectrum of 1 KHz to about 150 MHz. Cost is a consideration as I would use it infrequently. My hobby is refurbishing old tube type amateur radio equipment. What I am looking for would be a unit similar to a 8557A or 8553B in the HP line. Can anyone suggest something in TEK line that would be of value to me? David KC2JD/4 |
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Re: Need MC4035P chip for a DC503
Peter, thas is an MMC which is a 4000 series cmos IC that is equal to theCD4053. The MC4035P is a motorola "only" IC, much older with no equivalent as far as Iknow. Ooops, sorry - so again the wrong part. I had a look for this part in our stock but I could not find one... Sorry. Ciao Peter The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof. |
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Re: Need MC4035P chip for a DC503
Luis Cupido
Peter, thas is an MMC which is a 4000 series cmos IC
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that is equal to the CD4053. The MC4035P is a motorola "only" IC, much older with no equivalent as far as I know. Luis ct1dmk ----- Original Message -----
From: "Ullrich Peter" <peter.ullrich@...> To: <jbarnes@...>; <TekScopes@...> Sent: Tuesday, January 30, 2007 12:49 PM Subject: AW: [TekScopes] Re: Need MC4035P chip for a DC503 Here is a datasheet for it: Ciao Peter -----Urspr???ngliche Nachricht----- Von: TekScopes@... [mailto:TekScopes@...] Im Auftrag von jbarnes Gesendet: Dienstag, 30. J???nner 2007 13:40 An: TekScopes@... Betreff: Re: [TekScopes] Re: Need MC4035P chip for a DC503 Luis is absolutely right. I am pretty sure that the design of the DC503 was before 4000 series of CMOS was invented. I did find a referenceto the MC4035P. It was described as a quad 'D' type latch with open collector outputs. I looked at the schematics of the later DC50xA counters and they do not use these chips. I think the best source is another DC503. They are selling pretty cheap on eBay. Regards, John Correct, ________________________________________________________________ Sent via the WebMail system at aztec-net.com Yahoo! Groups Links The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof. Yahoo! Groups Links |
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Re: Need MC4035P chip for a DC503
Here is a datasheet for it:
Ciao Peter -----Urspr¨¹ngliche Nachricht----- Von: TekScopes@... [mailto:TekScopes@...] Im Auftrag von jbarnes Gesendet: Dienstag, 30. J?nner 2007 13:40 An: TekScopes@... Betreff: Re: [TekScopes] Re: Need MC4035P chip for a DC503 Luis is absolutely right. I am pretty sure that the design of the DC503 was before 4000 series of CMOS was invented. I did find a referenceto the MC4035P. It was described as a quad 'D' type latch with open collector outputs. I looked at the schematics of the later DC50xA counters and they do not use these chips. I think the best source is another DC503. They are selling pretty cheap on eBay. Regards, John Correct, ________________________________________________________________ Sent via the WebMail system at aztec-net.com Yahoo! Groups Links The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof. |
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Re: amateur tries to diagnose Tek 2465 blanking problem (long)
Russ
I found on my 2467 that the connections to the CRT plates are very close to the holes in the metal chassis to pass the wires through. I had to bend mine slightly to fix an intermittent problem somewhat similar to yours. I think the tube could possibly shift enough, especially if the scope has been shipped, to allow these connections to short to the chassis. Worth a look anyway before getting too involved with the electronics. (When in doubt scope it out.)
Russ WQ3X --------------------------------- Bored stiff? Loosen up... Download and play hundreds of games for free on Yahoo! Games. |
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Re: Need MC4035P chip for a DC503
Luis is absolutely right. I am pretty sure that the design of the DC503 was before 4000 series of CMOS was invented.
I did find a referenceto the MC4035P. It was described as a quad 'D' type latch with open collector outputs. I looked at the schematics of the later DC50xA counters and they do not use these chips. I think the best source is another DC503. They are selling pretty cheap on eBay. Regards, John Correct, ________________________________________________________________ Sent via the WebMail system at aztec-net.com |
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Re: Need MC4035P chip for a DC503
Luis Cupido
Correct,
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The MC4035 is NOT a CD4035 (the MC14035 is a CD4035). luis c. ct1dmk ----- Original Message -----
From: "faustian.spirit" <faustian.spirit@...> To: <TekScopes@...> Sent: Tuesday, January 30, 2007 9:00 AM Subject: [TekScopes] Re: Need MC4035P chip for a DC503 Would the Mot equivalent for a CD4035 not be MC14035, as opposed to |
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Re: Need MC4035P chip for a DC503
faustian.spirit
Would the Mot equivalent for a CD4035 not be MC14035, as opposed to
MC4035? --- In TekScopes@..., "Dan Meeks" <dan-meeks@...> wrote: same). On Behalf Of georgeplhak |
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Re: Need MC4035P chip for a DC503
I have a CD4035AN if you want it.
I can't tell if it's the same as the MC4035P (the pkg should be the same). Here's a data sheet for the CD4035 if it helps you sleuth it out - You're welcome to it, just give me your address - Dan _____ From: TekScopes@... [mailto:TekScopes@...] On Behalf Of georgeplhak Sent: Monday, January 29, 2007 7:28 PM To: TekScopes@... Subject: [TekScopes] Need MC4035P chip for a DC503 I could tell the story of how I blew up this previously working counter by plugging it into a TM500 frame with some rear interface wiring and a broken key, if anyone is interested in a cautionary tale? In any case, today I have found the last of about seven chips that were fried and the counter now works again except for the most significant digit for which I need one of these Motorola latches. Many online parts places say that they have these chips but have multi hundred dollar minimum orders. Can anyone please suggest a reasonable source, or might you have one or two onhand that I could purchase? Thanks much George Plhak Acton, Ontario, Canada |
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Re: Need MC4035P chip for a DC503
georgeplhak
TEK DC503
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--- In TekScopes@..., "jbarnes" <jbarnes@...> wrote:
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Need MC4035P chip for a DC503
georgeplhak
I could tell the story of how I blew up this previously working
counter by plugging it into a TM500 frame with some rear interface wiring and a broken key, if anyone is interested in a cautionary tale? In any case, today I have found the last of about seven chips that were fried and the counter now works again except for the most significant digit for which I need one of these Motorola latches. Many online parts places say that they have these chips but have multi hundred dollar minimum orders. Can anyone please suggest a reasonable source, or might you have one or two onhand that I could purchase? Thanks much George Plhak Acton, Ontario, Canada |
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WTB Part 475A Help!
wb9iog
Finally got around to checking my "new" unit out and after
making a test stand for it and study the shipment damage done to the B delay trigger slope/level control. Just about got it solved then lost a small clip to hold the shaft pressure against the variable resistance. Need it! Anyone got one? 10K pot with switch marked as 311-1192-00 10K 20 9250. I suspect that a plane 475 would be the same; either A or B control would work. Hope there are some junkers out there. If you have one with a bad switch or defective variable that's ok I can fix that my parts are good. It was just mechanical damage. Knob for the variable ?? Dead in the water with out it. Mike Iowa BTW the test stand I made probably works better than the standard plastic shroud. |
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Re: 496P Scams on eBay
John Miles
If this is who I think it is (Carla Morris at Consolidated Surplus), they
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are fine in my experience. I have bought and rented probably a dozen manuals from her. What happened in your case? -- john, KE5FX -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]On Behalf Of Lars Ahlstr???m Sent: Monday, January 29, 2007 1:39 PM To: 'Stefan Trethan'; TekScopes@... Subject: SV: [TekScopes] 496P Scams on eBay 3830616219 Is that a scam or not? I got fooled by it, but lost the dispute. I wanted a 2430A paper users manual. What did I get, do you think? ....a long nose. (means embarrasment in swedish) /Lars |
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Re: In search of the "Safest" bench test setup
At 21:48 29/01/2007, Stefan Trethan wrote:
I haven't needed my HV probes much, but you are right they are huge beasts.Virtually the only use I ever make of my, also non-Tek, HV probe is to check the CRT accelerating voltage on Tek scopes. As my probe also has a screw-in tip I have made up a Tee piece, using one lead with male connector from a failed HV tripler, one lead with female connector from a failed CRT and a further piece of HV lead connected to a compatible screw to replace the probe's tip, all connections heavily insulated. Now all I have to do is to replace the tip with the Tee, disconnect the anode lead, plug in my Tee and switch back on without having to get anywhere near anything nasty. Ben -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.12/655 - Release Date: 28/01/2007 13:12 |
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Re: In search of the "Safest" bench test setup
Stefan Trethan
On Mon, 29 Jan 2007 22:30:53 +0100, Ron Simmons <RJSimmons@...> wrote:
First, thank you Stephan T , Stephan J and Bob K for your excellent andI haven't needed my HV probes much, but you are right they are huge beasts. I discovered mine (non tek) have a screw-on tip, so i could probably make up a short lead with a clip, to be connected in the discharged state. I guess the tek probe might have a screw-on tip as well. ST |
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Re: 496P Scams on eBay
Lars Ahlstr?m
3830616219
Is that a scam or not? I got fooled by it, but lost the dispute. I wanted a 2430A paper users manual. What did I get, do you think? ...a long nose. (means embarrasment in swedish) /Lars -----Ursprungligt meddelande----- Fr?n: TekScopes@... [mailto:TekScopes@...] F?r Stefan Trethan Skickat: den 29 januari 2007 21:45 Till: TekScopes@... ?mne: Re: [TekScopes] 496P Scams on eBay On Fri, 26 Jan 2007 14:07:25 +0100, Mark Vaughan <mark@...> wrote: However if you are the seller on Ebay, the most secure way you can I'm not sure bank transfers work as well in the US as they do for us here. (BTW your pounds are annoying, transfers in non-euro currency are expensive! Why don't you convert? Maybe they'd even let you print the queen on the back ;-) ) You are right about some places having trouble with IBANs (Portugal also i remember). ST Yahoo! Groups Links |
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Re: In search of the "Safest" bench test setup
First, thank you Stephan T , Stephan J and Bob K for your excellent and
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knowledgeable inputs. They should be required reading for all on the board. The more I read, the more I discover that there IS NO ONE WAY. The ONE safety practice I have adopted (note-..I'm still here posting) is that when measuring any HV I: 1. With all power off to everything, discharge the test point I plan to probe to ground. In other words , I treat it like a big capacitor. As we know , even with all protection in place, if you "get across" a big cap in a DUT you can be on the way to the undertaker 2. I then attach an insulated alligator clip to the test point desired and clip the other end to my Tek 6015 probe tip. 3. Then without touching anything, I stand back and apply power and observe the reading then power off, discharge test point etc. I have the good fortune to have an excellent 6015 which is fully charged with Freon 114. The probe has a very large tip which is not optimal for trouble shooting oscilloscopes but perfect , I imagine, for the "tesla coil crowd". This is why I "wire it in" to the circuit first instead of "probing" with a veritable "baseball bat" Thanks again to respondents...one can not know too much about safety. Ron Simmons -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Stefan Trethan Sent: Monday, January 29, 2007 1:28 PM To: TekScopes@... Subject: Re: [TekScopes] In search of the "Safest" bench test setup On Mon, 29 Jan 2007 17:01:16 +0100, HBcubed <rjsimmons@...> wrote: My main test gear is a 465B scope with it's case/frame NOW hardwiredIt would be better to ground it through the electrical ground (ground prong or screw on an outlet). It is not always a good idea to use the plumbing for ground, since great hazards are created if the plumbing is not properly earthed, or some pipes are plastic (or are later replaced for plastic). It depends on your local regulation if it is still legal to use the plumbing. My questions are:Why would you? A variac is used for VARIable AC. Your scope should be made to run off mains voltage. Many scopes have internal adjustment for "low" "normal" or "high" line voltage, i don't know the 465B. If so, is the variac considered an "isolation xformer?Most variacs are not, they are so called autotransformers with no isolation between input and output. There are also isolated varicas, which have a second fully isolated winding under the outer output winding with the wiper. But often an isolation transformer will be put in front of a variac to provide isolation and adjustable voltage. Should the device under test also be grounded to the water pipe?Depends. Usually your DUT should be grounded, via the electrical system. Sometimes if the DUT is powered via an isolation transformer the ground is intentionally removed. You should not need that if you don't exactly know how or why. Can I power the DUT with the same variac?You can certainly power the DUT with the one variac, you do not need one for a functioning bench scope that is used as test gear and meant to run on your line voltage. What is the "perfect" ( safest) bench test configurationA bench configuration can not make it perfectly safe, although it can make it unsafe. An universal bench configuration (which i use) is the scope grounded and powered by regular mains ("just plugged in"). The DUT is powered through an isolation transformer (ideally with isolation monitor so you are made aware of a fault), possibly combined with a variac to bring things up slowly and check for supply range etc. On my own bench all connections are jumpered with 4mm jumpers, so i can remove ground from the DUT, but ONLY if i know what i am doing. I didn't need that much, if ever. It should be said that a GFI protected outlet can actually be safer than using an isolation transformer, in some cases. If you are not using the isolation transformer you should _always_ use a GFI to power the DUT (i highly recommend using one for everything, test gear and all). Note that GFIs do not function with isolation transformers, it's one or the other. I will rebuild my bench soon and then it will have V/A/W/phase angle meters for the DUT power. I have collected nice industrial panel meters and i will build my very own small "nuclear power station control panel", always wanted that ;-). I've also gotten hold of a nice isolation monitor which will be part of the new bench. ST Yahoo! Groups Links |
Peter Ullrich
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