>
>measures wrote:
>
>>>The SWR in a 50 Ohm system then is 1:1. In a 93 Ohm system
>>>you would have the SWR mismatch of 1.86:1,
>>
>>? Even though there is a half wavelength of 93 ohm coax between the gen.
>>and the termination, the system is not 93 ohms. It is 50-ohms at both
>>ends of the half wavelength albeit-mismatched transmission line.
>
>Correct. I wrote the statement above yours and in my entire post
>specified the system as a 50 Ohm system.
>>
>>> but in a 50 Ohm system, our
>>>VSWR is 1:1.
>>>
>>? If the termination were changed from 50 to 100-ohms, it would look
>>like 100-ohms at the generator and there would be no reflection at the
>>halfwave point.
>
>Not exactly, Rich. If the load impedance is 100 Ohms and the transmission
>line impedance is 93 Ohms and the source is at 50 Ohms you can't say this.
>
? The generator Z was never stated. It is zero ohms.
>If the source is 100 Ohms and the load is 100 Ohms, then you are correct.
>There would be no reflection.
>>
>>>So the bottom line is that if you have a 50 Ohm load and a 1/2 wavelength
>>>of coax that it matters not what the impedance of that coax is! It's
>>>inherently narrow band, but that's the case.
>>
>>? Agreed. However, above you claimed that the SWR is 1.86:1.
>
>I never did. I always claimed the SWR is 1:1 at the halfwave point in
>this 50 Ohm system.
? sorry for the blunder.
>If I define my characteristic impedance (system
>impedance) as 93 Ohms, then I do have a 1.86:1 SWR. But your original
>question revolved around a 50 Ohm system.
>
? The original questions:
"Questions 1 and 2:
A 50-ohm termination is connected to a generator through a one-half
wavelength, 93 ohm characteristic-Z coaxial cable.
What is the SWR as measured at the generator with a 50-ohm
characteristic-Z SWR meter?
What is the SWR with a 93-ohm characteristic-Z SWR meter?"
--------
You gotta get yo' ducks lined up.
- Rich..., 805.386.3734, www.vcnet.com/measures.
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|