[Elecraft] Oscilloscopes

[Jim Miller KG0KP]

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" <n0ss at embarqmail.com>
To: "Jim Miller KG0KP" <JimMiller at STL-OnLine.Net>; 
<elecraft at mailman.qth.net>
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" <w3fpr at embarqmail.com>
>To: "Jon Kåre Hellan" <hellan at acm.org>
>Cc: "'Elecraft List'" <elecraft at mailman.qth.net>
>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
> >
> >
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