Thanks everybody on the Tek 475 info. I use Google for a lot of things - why don't I think of it in a case such as this ??? Old age gets the blame again.
Thanks es 73, de Jim KG0KP ----- Original Message ----- From: "Tom Hammond" <[email protected]> To: "Jim Miller KG0KP" <[email protected]>; <[email protected]> Sent: Thursday, May 21, 2009 1:21 PM Subject: Re: [Elecraft] Oscilloscopes Jim: Just GOOGLE for 'tektronix 475' and then select one or more of the links. I quick search shows that the Tek 475 is a 200 MHz o'scope. 73, Tom N0SS At 10:06 05/21/2009, you wrote: >How do you know what the frequency rating of a scope is? >What is the rating of my Techtronics 475? >We used them at work for required adjustments to tolerances of 2/10 >nanoseconds. > >Thanks es 73, de Jim KG0KP > >----- Original Message ----- >From: "Don Wilhelm" <[email protected]> >To: "Jon Kåre Hellan" <[email protected]> >Cc: "'Elecraft List'" <[email protected]> >Sent: Thursday, May 21, 2009 8:02 AM >Subject: Re: [Elecraft] Oscilloscopes > > >Jon, > >For use on the HF bands, go for a 'scope rated at 100 MHz or higher, and >be certain to use probes that are also rated for 100 MHz or more. >The frequency rating of a 'scope is the point where the vertical >response is down 3 dB, so you will not be able to do valid voltage >measurements at frequencies beyond about 1/3 of the frequency rating of >the 'scope. The 50 mHz 'scope will give valid voltage measurements up >to about 16 MHz while the 100 MHz 'scope will be good up through 30 MHz. > >If good measurement of voltages is not important to you, then the 50 MHz >'scope may be OK, even though the voltage (signal amplitude) may be >attenuated, it will still show a proper waveform up to its rated >frequency and often beyond - unless the input waveform is a pulse or a >square wave where the rise time is one of the important parameters - for >most amateur radio purposes, that is not important. > >Analog vs. Digital - no comment, but I prefer the real time analog >'scope, no potential digital artifacts to deal with. > >73, >Don W3FPR > >Jon Kåre Hellan wrote: > > Hi > > > > I'm thinking about buying a scope. I've seen many people recommend > > getting an old analog scope, but they're big! I borrowed a compact 100 > > MHz digital scope from work, and it was nice. 50 MHz scopes are a lot > > cheaper, though. > > > > Will I regret getting a 50 MHz scope instead of a 100 MHz one? > > > > 73 > > Jon LA4RT > > > > >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:[email protected] > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html > > >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:[email protected] > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
