--Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On Behalf Of Gary Schafer Sent: Tuesday, January 01, 2002 1:03 AM To: audioguy@charter.net Cc: amps@contest
The cable and attenuator errors can be known without error, all he has to do is pay a cal laboratory to characterize each at the test frequencies. -- Ron KA4INM - I'm proud to be Chuck's pop! ______
"The cable and attenuator errors can be known without error, all he has to do is pay a cal laboratory to characterize each at the test frequencies." I've watched the Array Solutions guys calibrate th
There is also the inaccuracy of the vna that has to be added in also. They don't say what that is. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com
Good point. I just emailed W5BIG (the VNA designer) with this question. He said that the VNA2180 has been lab-tested with precision calibrated attenuators. The VNA2180 was off a maximum of 0.3 dB wit
Not quite. They can calibrate the couplers all they like. Unless the directivity is high the readings are erroneous in the real world. The claimed directivity of their V/UHF couplers is awful and the
While that accuracy may be good for general tasks around the ham shack it comes no where near what is needed to do any kind of decent calibration. When changing from 60 to 70 db attenuators and getti
The VNA uncertainty is less at lower attenuation levels. Supposedly better than 0.1dB at 50 dB attenuation. And obviously it is zero at 0 dB (straight thru coax) as that is where it is calibrated, Th
Phil, Do you have a way to check the accuracy of your PowerMaster below 2-watts? Below 1-watt, my PowerMaster deviated substantially from the Alpha 4510, LP-100, and a 200 MHz scope measured across
Hi Paul - I haven't looked at the PowerMaster below 5-watts. I don't believee it measures SWR much below 5-watts for that matter. However, I'm curious. I'll look at it tomorrow. I have a Tektronix TD
Phil, Since the TDS-2XXX scopes are not 50 ohm input, don't ignore the capacitance in the probe. See the appendix in the manual on page 153. The capacitance will be less at the 10X probe setting but
Yes - I'll be using the 10X probe setting and doing the measurement at 1.8mhz. Phil -- Original Message -- From: "Larry Benko" <xxw0qe@comcast.net> To: "Phil & Debbie Salas" <dpsalas@tx.rr.com> Cc: <
My PowerMaster tracks very nicely down to 2.5 watts (within a few percent of my TekTronics TDS-2022). 2.5 watts is the lowest power I can get out of the IC-706MKII that I'm using for a source. Somewh
Phil, I just took a look at the PowerMaster's specifications on p. 25 of the most recent on-line manual. For both the 3KW and 10KW couplers, its rated accuracy is specified down to 1-watt. It's a goo
Hi Phil, I too have been obsessing about accurate power measurements over the last year or so. I made a coupler somewhat like that used in the typical wattcmeters, a torpid with the center conductor
May I suggest the LP 100. It's truly an accurate test instrument. Phil Philip LaMarche LaMarche Enterprises, Inc. www.instantgourmetspices.com www.w9dvm.com 800-395-7795 pin 02 727-944-3226 FAX 727-9
Hi Gary - I have two PowerMasters. I live fairly close to Array Solutions, so I went there and watched them cal the couplers on their HP set-up. It gave me a lot of confidence. Since they put in trim