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| Frequency Divider for older Oscilloscopes?? |
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| 2N3055:
--- Quote from: tggzzz on April 02, 2020, 07:16:48 pm --- --- Quote from: 2N3055 on April 02, 2020, 05:10:57 pm --- --- Quote from: tggzzz on April 02, 2020, 03:28:07 pm --- --- Quote from: 2N3055 on April 02, 2020, 12:08:41 pm ---You have to have 100MHz bandwidth scope, no matter if it is analog, analog sampling, digital sampling or digital real time. --- End quote --- Not quite true. Back in the 70s I saw 10MHz waveforms captured and displayed on an XY pen chart recorder :) If you have a sampling scope everything up to and including the sampler has to be full speed, but the rest can be as slow as is convenient. --- End quote --- That was only display. You had 10MHz scope (sampler type) in front of it. I thought I explained what I meant. It was a 10 MHz sampling scope assembled from two devices, sampling head with S/H and pen chart recorder as display.... --- End quote --- The OP wants to see a 100MHz signal on his 10MHz scope. That is possible with a sampling front end. --- End quote --- That is what I'm saying too. And that comprises a sampling scope with required bandwidth. His original question whether he can down-convert the signal like it is done in direct heterodyne receiver, and look at it on 10MHz scope and preserve pulse shape of original signal. He can't. It wasn't discussion of how sampling scopes work. |
| tggzzz:
--- Quote from: 2N3055 on April 02, 2020, 07:31:16 pm --- --- Quote from: tggzzz on April 02, 2020, 07:16:48 pm --- --- Quote from: 2N3055 on April 02, 2020, 05:10:57 pm --- --- Quote from: tggzzz on April 02, 2020, 03:28:07 pm --- --- Quote from: 2N3055 on April 02, 2020, 12:08:41 pm ---You have to have 100MHz bandwidth scope, no matter if it is analog, analog sampling, digital sampling or digital real time. --- End quote --- Not quite true. Back in the 70s I saw 10MHz waveforms captured and displayed on an XY pen chart recorder :) If you have a sampling scope everything up to and including the sampler has to be full speed, but the rest can be as slow as is convenient. --- End quote --- That was only display. You had 10MHz scope (sampler type) in front of it. I thought I explained what I meant. It was a 10 MHz sampling scope assembled from two devices, sampling head with S/H and pen chart recorder as display.... --- End quote --- The OP wants to see a 100MHz signal on his 10MHz scope. That is possible with a sampling front end. --- End quote --- That is what I'm saying too. And that comprises a sampling scope with required bandwidth. His original question whether he can down-convert the signal like it is done in direct heterodyne receiver, and look at it on 10MHz scope and preserve pulse shape of original signal. He can't. It wasn't discussion of how sampling scopes work. --- End quote --- In the first post he is after frequency, not wave shape. In the second post I noted you can simply downconvert to below 10MHz. |
| 2N3055:
--- Quote from: tggzzz on April 02, 2020, 08:35:45 pm --- In the first post he is after frequency, not wave shape. In the second post I noted you can simply downconvert to below 10MHz. --- End quote --- I went back an read it again. And now I must say you are 100 % correct about that. I was confused.. Sorry about that and thank you for being patient with me and setting me straight.. All the best, Sinisa |
| tggzzz:
--- Quote from: 2N3055 on April 02, 2020, 08:46:34 pm --- --- Quote from: tggzzz on April 02, 2020, 08:35:45 pm --- In the first post he is after frequency, not wave shape. In the second post I noted you can simply downconvert to below 10MHz. --- End quote --- I went back an read it again. And now I must say you are 100 % correct about that. I was confused.. Sorry about that and thank you for being patient with me and setting me straight.. All the best, Sinisa --- End quote --- No problem. We all make mistakes, but too few of us admit it :) Besides, some mistakes are more interesting than others :) |
| Jorge Ginsberg:
Hello Mr. GlennSprigg I am new to this forum and just read your question. I am an Electronics Engineer but I am already retired. I live in Argentina and my English is very bad. I am writing to you with the help of "Google Translator". As your post is more than 1 year old, before answering I would like you to tell me if you have already solved your question so I don't write in vain. Best regards from Buenos Aires. (My sister lives in Australia, in Melbourne) |
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