[Premium-Rx] Radios and High RF powers

[George Georgevits]

John,

There must be more to it than that - something about the length of the pipe
vs wavelength it is trying to filter out. I seem to recall from my Uni days
way back that if you want something to act as a transmission line (and
presumably this applies to waveguides as well) then it must be a significant
fraction of the wavelength you are working with. Otherwise, it acts like a
lumped element. In other words, six inches of pipe would look like a very
small feedthru capacitor? Perhaps someone can enlighten me here?

Given the above, 8uS rise time corresponds to something like 75KHz, and the
wavelength is VERY long. You would need a lot of pipe?

Regards,
George Georgevits
Power and Digital Instruments Pty Ltd


-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org]On Behalf Of J. Forster
Sent: Tuesday, 3 June 2003 7:44 AM
To: George Georgevits
Cc: larry at gadallah.com; premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] Radios and High RF powers


That's why a WG below cutoff works. If it had a risetime of less than a
nanosecond, it would have lots of GHz stuff that'd go right through a pipe a
inch or two in diameter.
-John

George Georgevits wrote:

> Guys,
>
> The standard impulse shape used to simulate lightning surges in cable has
8
> microsecond rise time (10% to 90% of peak value) and 40 microsecond fall
> time to half value - hardly microwave stuff!
>
> Regards,
> George Georgevits
> Power and Digital Instruments Pty Ltd
>




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