Jason,
The Amphenol 132360 is rated at 1.3 VSWR (17.7dB return loss), but up to 18GHz. It looks like it has a center pin that rotates with the external nut, so it might be fine for terminating an unused port, but not so good as a repeatedly used standard. (I am basing this on the drawing, I don't have one in hand.)
--John Gord
On Sun, Dec 13, 2020 at 08:01 PM, Jason Ringas wrote:
Could the Amphenol 132360 be used for the same purpose? How would it
compare to the Mini Circuits item?
Thanks.
On 2020-12-13 6:52 p.m., Roger Need via groups.io wrote:
Looking through the old messages I see a post by Alan Wolke (W2AEW) where he
recommends a low-cost Mini Circuits ANNE-50L+ SMA termination as a 50 ohm cal
load replacement for the one provided with the NanoVNA-H4.
/g/nanovna-users/message/14199
The specifications are very good for the ANNE-50L+. The Return Loss (RL)
near DC is 55 dB which is a DC resistance of 49.85 ohms compared to the one
that came with my unit which measures 50.78 ohms and a RL of 42 db at low
frequencies. The ANNE-50L+ RL slowly gets worse as the frequency is increased
but even at 1.5 GHz (max for -H4 with factory firmware) it is 42 dB. My
interests are with HF and UHF/VHF where the RL is no worse than 50 dB.
There is a belief that low frequency RL performance is a trade-off with high
GHz performance. To some degree this is true as you can see in the RL vs
frequency plots I attached for the mini Circuits Anne series of terminators.
From the previous thread on this subject some felt that there was no need to
be concerned about RL to this degree and the supplied cal kit is satisfactory.
That is true if all one is interested in is measuring/tuning antennas for
VSWR and to get a rough idea of impedance. But some of us, like me, are
mainly concerned with measuring components, filters, baluns, circuit S
parameters etc. and we are trying to get the best performance possible from
our NanoVNA. I am amazed how accurate the NanoVNA devices can be with proper
attention to calibration and test fixture construction.
Roger
On Sun, Dec 13, 2020 at 08:01 PM, Jason Ringas wrote:
Amphenol 132360
