If you are only using two antennas, then the CB antenna in the center, and the tri-band on the other centerline spot. The off-center mount would have least affect on an 700/800/900 MHz antenna, compared to lower freqs.
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Larsen NMO27 reviews? Pictures?
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K6EEN
Member
Here's the sweep across the band showing better than 2:1 (though not much better) with 1.73:1 SWR on Channel 19 or 27.195 MHz. Photo of Diamond K400 mount on trunk lip of small car also attached.
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doctorbubba010
Learner
Here’s a picture of it on a 2016 FPIU center mount. With a Larsen NMO RG58 coax.
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n0iop
Member
Just got around to installing my NMODC27. I cut the whip for 10m.
The SWR is curiously high. Fender mount on my pickup, not ideal but I carry a canoe on the roof. The 6 meter MLB4700 works fine so I don't think I have a problem with the NMO or the feedline.
Advice welcome. I'm thinking of buying another loading coil but am not sure that will clear up the problem.
(Disregard the red trace as the input wasn't connected to anything but I hadn't shut it off). Here's the trace showing the SWR around 2.48:
Here's the 6m antenna on the same mount. Different scale on the trace, SWR under 1.7 for the band with the minimum SWR around 1.06:
The SWR is curiously high. Fender mount on my pickup, not ideal but I carry a canoe on the roof. The 6 meter MLB4700 works fine so I don't think I have a problem with the NMO or the feedline.
Advice welcome. I'm thinking of buying another loading coil but am not sure that will clear up the problem.
(Disregard the red trace as the input wasn't connected to anything but I hadn't shut it off). Here's the trace showing the SWR around 2.48:
Here's the 6m antenna on the same mount. Different scale on the trace, SWR under 1.7 for the band with the minimum SWR around 1.06:
n0iop
Member
Thanks. I put in a bunch of bonding braids before figuring out that I hadn't calibrated the VNA properly. I had cut the antenna to the correct length, but the SWR is around 1.3 at resonance, which is close to what I would have expected.
K6EEN
Member
When I added a DC grounding braid between the K-400 trunk lip mount base and a hard point on the car body inside the trunk, my SWR shot up from 1.73:1 to 3:1.
Don't think you'll get much better than 1.3:1 on a pickup truck front fender bracket mount with this antenna. It was designed to be centered on the steel roof of a 1970s era police sedan with an NMO 3/4 inch hole mount. Once you deviate from the designed mounting configuration, the SWR starts to creep up.
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