W5AWS Mobile Dual-band Antennas

In this document, I look at using portable transceivers in the home environment where establishing a permanent shack isn’t possible or necessarily desirable. I prefer to make-do with what I’ve got, which enables me to get going almost anywhere, avoiding permanent installation.

To read the whole document click this link.

Posted in Member Corner.

One Comment

  1. W5AWS / Andrew:
    Thanks for the detailed report on your findings for your dual-band antenna. I have the Diamond NR770HNMO which is the NMO version of the same antenna and I specifically chose it because it is radialless which would go well fender-mounted on my Jeep JT which body is a combo of plastic, fiberglass, aluminum, and steel. While I am satisfied with the actual performance of the antenna with my HT at 5 watts, I too noticed the SWR was higher than advertised on the UHF band. I checked the antenna’s SWR after I installed it with a NanoVNA and had readings very similar to yours on the freqs of 440 to 450 MHz. I didn’t record the actual readings but since my signal reports are good on both bands I just figured maybe my antenna had this reading due to the fender mount. After reading your report it definitely appears Diamond needs to re-check their specs.

    One more observation, when taking a quick wide-band sweep of the antenna with the NanoVNA, I noticed the 220 MHz band had better SWR than the 440 MHz band, even thought the antenna is not listed as a tri-band. I’m now curious what your SWR is at 220 MHz. Maybe we actually have mislabeled tri-band antennas?
    Sincerely,
    Chris Elliott – W5CAE

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