A quick look at the line would be put a 450 ohm resistor at the far end and
check at an odd quarter wave for the z on the nano.
A given length of line has an odd number of quarter waves at numerous
frequencies. The wave length,at velocity factor for the line, should show,
1 to 1 swr, a high return loss, or if TDR is on the nano variant should
show the z.
The velocity factor usually supplied by the manufacturer. In this case the
velocity factor is a result of the air window and the polyethylene spacer.
In this case I'd determine an adjusted quarter wave at a short length of
line shorted at one end, near the higher frequency of the instrument, and
verify the resonant frequency. That would verify the suppliers velocity
factor.
For hf through low uhf, six 2700 ohm carbon 1/4 w resistors in parallel
with short leads should be a easy load with whatever connector.
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On Mon, Mar 1, 2021, 1:01 PM Donald S Brant Jr <dsbrantjr@...> wrote:
All: Unless one is building a tuned circuit like a tuning stub or a series
matching section, and in the typical use case of an untuned feeder for a
non-resonant dipole, the exact impedance and velocity factor are mostly
irrelevant. 73, Don N2VGU
