On 8/13/20 5:52 PM, Glen Jenkins WB4KTF wrote:
The 50 OHM load (SMA-Male) that came with my nanoVNA-H4 measures 51.13+ ohms. Not a good start for calibration. Where is a good source for GOOD loads that are accurate?
that's a VSWR of 1.023:1 and a S11 of -39dB
55 ohms is 1.1:1
How much are you willing to pay?
Pasternack has a SMA Male load (PE6002) for $38
VSWR specified at 1.17:1, which is worse.
For $1900 they'll sell you a 3.5mm load for a cal kit
up to 4GHz they claim S11 mag <-40dB
That's about the same as the load you have.
It will come with a certificate, though.
They have a cheaper one for $485 PESTR1001 - it's actually better up to 3GHz, -44dB for S11 mag, worst case, typical is -46
The chart in the data sheet actually shows better than -50dB at 1 GHz
