[vna] Questions

[tom.mcdermott4 at sbcglobal.net]

Hi Roger,

	The FAQ is on the same webpage as the software:

http://www.tapr.org/software_library.php?dir=/pub/n5eg


	Just a guess, did you calibrate the fixture 'through' with a 40 dB
attenuator instead of a barrel connector? Wouldn't be the first time!

	-- Tom, N5EG








> -----Original Message-----
> From: vna-bounces at lists.tapr.org 
> [mailto:vna-bounces at lists.tapr.org] On Behalf Of Roger D Johnson
> Sent: Tuesday, January 09, 2007 8:52 PM
> To: vna at lists.tapr.org
> Subject: [vna] Questions
> 
> 
> I've been playing with my new VNA for a while and think I
> have it mostly figured out. However, there is one thing that
> is giving me fits. I tried to measure loss and phase shift
> through my receive 4 square controller, The phase readings
> seemed to be accurate but the amplitude was funny. I found
> that with the fixture cal turned off, the amplitude readings
> were OK but when turned on, they jumped up about 40 db! So
> instead of seeing about a 6 db loss I'm seeing about 34 db
> gain! I redid all the cals with no improvement.
> 
> I looked for the FAQ on the TAPR site but was unable to locate
> it.
> 
> 73, Roger N1RJ
> 
> -- 
> Remember the USS Liberty (AGTR-5)
> http://ussliberty.org/
> 
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