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[AMPS] Re: The Worldwide, No Holds Barred, SWR Quiz.

To: <amps@contesting.com>
Subject: [AMPS] Re: The Worldwide, No Holds Barred, SWR Quiz.
From: measures@vcnet.com (measures)
Date: Tue, 5 Oct 1999 03:37:54 -0700
>
>On Tuesday, October 05, 1999 4:09 AM, measures [SMTP:measures@vcnet.com]
>wrote:
>> 
>> >
>> >On Monday, October 04, 1999 1:40 PM, Vic Rosenthal
>> >[SMTP:rakefet@rakefet.com] wrote:
>> >> 
>> >> measures wrote:
>> >> > 
>> >> > >What is the SWR as measured at the generator with a 50-ohm
>> >> > >characteristic-Z  SWR meter?
>> >> > 
>> >> > ? At the end of an any characteristic.-Z halfwave transmission line,
>> >> > the termination Z repeats itself --  with a reactance reversal.  .
>> >> > Since there is no reactance in this termination, the Z at the end of 
the
>> >> > 93-ohm halfwave line is 50 +/- j0 ohms, the SWR is 1:1.
>> >> 
>> >> No.  It is correct that the impedance seen by the generator is 50 ohms 
but the
>> >> SWR is unchanged, regardless of the line length.   The SWR is entirely
>> >> determined by the impedances of the line and the load.
>> >>
>> >
>> >Yes. From what everyone's told me, this is 1.86:1 (93/50) regardless of
>> >the line length.
>> >The Z looking into the cable is 50 ohms, but there's standing waves on
>> >it from the load/cable mismatch.
>> >Those SWs don't change (or go away) because the Z changes.
>> 
>> ?  How do these standing waves remain invisible to the SWR meter at the 
>> halfwave measuring point? 
>> >......
>
>I think only you say they do.
>I didn't.
>
?  If  "The Z looking into the cable is 50 ohms", how can there be 
standing waves at that point?

later, Mike


-  Rich..., 805.386.3734, www.vcnet.com/measures.  


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