I used Pasternack as an example of what's available at a variety of retail price points. Not as a recommendation of what to buy.
It was too much trouble to hunt through Keysight's website to look for loads, calkits, etc., but yes, they have them, and I think I'd trust them more than Pasternack.
toggle quoted message
Show quoted text
On 8/16/20 8:17 AM, Dr. David Kirkby, Kirkby Microwave Ltd wrote:
On Fri, 14 Aug 2020 at 02:34, Jim Lux <jimlux@...> wrote:
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
That¡¯s true only if the reactance is zero.
How much are you willing to pay?
Pasternack has a SMA Male load (PE6002) for $38
Many RF engineers call them Pastercrap. I tested 10 Pastercrap loads and
not one met the specification.
For $1900 they'll sell you a 3.5mm load for a cal kit
up to 4GHz they claim S11 mag <-40dB
A Keysight load, with a better specification, would cost less, and would
actually meet its specification.
That's about the same as the load you have.
The chart in the data sheet actually shows better than -50dB at 1 GHz
That¡¯s ¡°typical¡±, but I don¡¯t believe much from Pastercrap.
My company could supply decent loads, but I would need to charge nearly
twice what a NanoVNA would cost.
<>
