I have tested a few tri-band antennas using an HP VNA. The antennas were
mounted in the middle of a large copper plane about 3-feet square.
Typically, most are good on only two of the three claimed bands. 220 is
usually the loser. However, I have found one and only one that exhibits a
good match on all three bands. That is the Diamond SRH320A. Of course, a
good match does not necessarily indicate a good radiator.
Dave - W?LEV
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On Sun, Feb 21, 2021 at 5:23 PM <davidb1stein@...> wrote:
Here is a quick check - put the 50 ohm load that you used for calibration
and run the same scan as you did for the tri-band antenna. I have had
several dual band and tri-band antennas over the years and have generally
found the dual band will have acceptable VSWR on both bands, but the
tri-bands will generally be ok on 2m/440 and high on 220 or ok on 2m/220
but high on 440. I suspect that for VHF/UHF tri-band antennas to work well
on all three bands is not an easy thing to do.
--
David S
--
*Dave - W?LEV*
*Just Let Darwin Work*
