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 ch
Its 1:1 or as close as your VSWR brige is accurate and has a adequate directivity so it does NOT gets messed up by the eventual existing different Z of your source. It is close to 2:1 same restiction
If I was in a picky mood, I'd inquire as to the characteristic impedance of the generator. :-) 73, Marv WC6W * ___________________________________________________________________ Get the Internet jus
? zero-ohms, Marv It's a voltage-source. cheers. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrativ
Undetermined, depending on the meter's construction and circuitry. This is not an appropriate instrument for this test. 1.86 to 1 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/amp
Since I'm wearing egg anyway, more can't hurt. 1. Smith Chart says 1/2 wave cable brings you all the around back to the original load impedance (50 ohms, here). Therefore the black box of the cable/l
? You have 50 +/- j0 ohms at the position of the SWR meter, and it reads 1.86:1? I don't see how, Mike. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/amps
On Tuesday, October 05, 1999 1:53 AM, measures [SMTP:measures@vcnet.com] wrote: of the reads Rich, this says that as long as I have a multiple-half-wave of cable, the impedance of the cable plays no
Because an SWR meter computes SWR by comparing forward and reflected power, not by being an impedance bridge! 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submission
ok It eliminates reflections only at the halfwave point. Cheers, Mike - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contest
On Tuesday, October 05, 1999 4:09 AM, measures [SMTP:measures@vcnet.com] wrote: [SMTP:measures@vcnet.com] to box of the end. reads created It doesn't eliminate the standing waves along the cable. The
But Vic, Source impedance is 50 Ohms. Load impedance is 50 Ohms. The transmission line is a length where even you agree that the transformed impedance at the end of it is 50 Ohms. So where is the imp
On Monday, October 04, 1999 4:23 PM, Jon Ogden [SMTP:jono@enteract.com] wrote: reads transmission line is a length where even you agree that the transformed impedance at the end of it is 50 Ohms. So
IF THE SOURCE WAS 93 OHMS, YES! But you are dealing with a 50 OHM source! -- -- -- -- You have to think of the entire system. The 93 Ohm line acts as an impedance transformer. The impedance at the in
? the Z presented at the point where the meter is inserted is 50 +/- j0 ohms. How could there be a reflection at this point? - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://ww
? True. . However, the meter is not moving along the cable. It is fixed at the generator end of the halfwave transmission line. ? Reflections exist only within the 93 ohm, half wavelength section. -
///snip/// -- Hi Rich, I think the main problem here is a lack of understanding as to what a standing wave is. It is simply a voltage or current on a line that changes amplitude as you move from one
OK ? indeed. So when the 50-ohm SWR meter is moved from either end of the halfwave section to the 1/4 wavelength / midpoint, the SWR increases from 1:1 to 1.86:1. . This is why SWR measurement is an