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Brian, As a reference point, when calibrated, the HP 8753D has a linear magnitude reflection uncertainty of 0.015 or so when the reflection magnitude is near 1. I am not sure if that means the

Settings: 401 points, 0.1-50 MHz, bandwidth 100 Hz, arithmetic 4X smoothing, power = 4 mA Brian

Measurement of a short at the VNA connector after clearing cal: 49002000 -0.869956992 0.080768176 49126750 -0.869913280 0.080994536 49251500 -0.869870784 0.081221216 49376250 -0.869828352 0.081447216

I'm sure that at least a few here are familiar with the following section from the STMicro application note "AN4974: Antenna matching for ST25R3911B/ST25R391x devices", since it calls for the use of a

That's "total power" or 1E-4 on I and 1E-4 on Q (so 1.4E-4 on absolute voltage)?

Jim, I can assure you our STEM students know nothing about significant figures! Terry (Dr. Terry Bullett) and I have tried, but no knowledge of the concept. They are Juniors going into their senior

On 4k IFBW as i can see H4 measure error (due to noise) on 100-200MHz near ~1e-4 (on linear trace) On 100Hz IFBW, near 1e-5

On 6/14/22 9:24 AM, W0LEV wrote: > Thank you, Jim!!! > > Again, we are not running a metrology lab nor do our measurements approach > those of HP, R&S, Tek, and others. Something my PhD friends tell

Thank you, Jim!!! Again, we are not running a metrology lab nor do our measurements approach those of HP, R&S, Tek, and others. Something my PhD friends tell me is that error analysis and assignment

Thanks for the reply, DiSlord. I'll check with Rudy, but I believe he calibrated at the VNA SMA immediately before the measurement since normally he never measures without a cable.. Brian

what would be interesting is to measure it without calibration, and with, and make sure there's not some mis calibration going on somehow.

I've asked Rudy to remeasure the short and open using MA (magnitude/angle) mode. That might shed some light on where the inaccuracy lies. Also, I think he was using averaging. It might be interesting

I think need recalibrate. Calibration must remove all errors.

Interesting - I wonder if it's a "round off" or truncation error of some sort.? The "detector" mixes with I/Q 5 kHz, summing, and there could

Carsten, my experience is all antennas, even those off the shelf one, need some finetuning. 1. Tuning - I would recommend the minimal height for tuning purposes is 3-4m over the ground at the end of

I tried this just last week. It seems work like a spectrum analyzer but having doubts about calibration. For this purpose I used Satsagen software and my HackRF One. -- ALVARO, EA8ARX

15070000 -1.000470519 -0.000045675 15194750 -1.000452399 -0.000081647 15319500 -1.000464559 -0.000072501 15444250 -1.000433683 -0.000034980 15569000 -1.000416160 -0.000060047 15693750 -1.000486493

@igor-m The summerhouse is in Sweden (900m2 Lot) , near Halmstad (outskirt of city). There can be both thunder & high winds (30m/s, when ugly) I was thinking of hammering 2 x 3M groundrods down , and

@Carsten: Lightning and Static: in the EFHW antenna with the transformer the antenna wire itself is grounded through the secondary and the coax via primary windings (a short for static). Your system