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Ham Radio . Magnum Experimentum

Antennas, experiments, engineering and other articles of interest to radio folks.

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    • Lab Shootouts
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NMO

Articles about the NMO mobile antenna mount system.

VHF magmount vs. hole-mount performance comparison

January 1, 2021January 4, 2020

Much has been said about the electrical disadvantages of using a magnetic mount for your VHF/UHF mobile needs. Measurements compare the magmount to a thru-hole NMO mount.

Categories Antennas Tags mag mount, measurement, NMO, VHF

BOB, the battery operated “beacon” for APRS

August 4, 2019July 29, 2019

I built a prototype APRS beacon, dubbed Thor Hammer (big), to test back-packable APRS 2m beacon concepts.

Categories Portable Tags 2m, APRS, backpack, Byonics, dipole, EFHW, end-fed, hiking, Laird, Larsen, N, NMO, portable, PVC, SMA

Not all mobile antennas are the same

May 18, 2019May 9, 2019

Mobile antennas have been around for decades, but assuming they perform the same is, sadly, a poor assumption as this comparison of Laird and Larsen VHF NMO EFHW aerials reveals.

Categories Antennas Tags 2m, B1322W, EFHW, end-fed, Laird, Larsen, NMO, NMOWB150B

Extreme NMO – Subaru, Silver and the 60″ Whip

May 22, 2018March 12, 2012
Daughter asks for 3rd time if Mom knows I'm drilling a hole in the car.

A reinforced Subaru through-hole NMO installation using silver epoxy and a metal plate stiffener accommodates the 62 inch Diamond SG7900A dual-band mobile antenna.

Categories mobile Tags 2m, 3/4, 70cm, Diamond, epoxy, NMO, silver, Subaru, UHF, VHF, whip

Antenna Measurements on Taurus 2m Whip

May 28, 2016February 20, 2012

Return Loss and SWR measurements of a permanent 2m whip installation mid-roof of a Ford Taurus. The effect of doors is shown.

Categories mobile Tags measurement, NEC, NMO, return loss, Simulation, SWR, Taurus

NMO Through-Hole Mobile Antenna Installation

May 11, 2019February 20, 2012
Finished Taurus 2m NMO Antenna Install Side View

Highlights from the installation of a 3/8 inch NMO permanent mount into a 1998 Ford Taurus rooftop.

Categories mobile Tags 2m, 3/8, Laird, NMO

Laird NMO Mobile Antenna Mounts

May 11, 2019October 15, 2010
NMO Mobile Mount Test Plate

Two NMO through-hole antenna mount parts, the Laird MBO and MABO, were prototyped to help down select the choice of 3/8″ or 3/4″ hole. The opinions of engineers, machinists and others were obtained.

Categories Antennas Tags 3/4, 3/8, Laird, MABO, MBO, mobile, NMO

NMO Mobile Antenna Mount Options

May 11, 2019August 29, 2010

It’s time to replace my mag mount antenna and go “through hole” with my Mobile Antenna. NMO seems to be the way to go. Reviewed are some candidates from brand name to no name.

Categories Antennas Tags 3/4, 3/8, Laird, mobile, Motorola, NMO

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2m 6m 10m 15m 20m 40m 43 foot 70cm 80m AHVD APRS Baluns battery BigIR copper Diamond dipole DX-Eng. EFHW Elecraft end-fed EZNEC Field Day Golden Packet hexbeam J-Pole Kenwood kj4faj KX3 kx4o measurement mobile NEC NMO NVIS packet PL259 QRP sdr Simulation SteppIR UHF vertical dipole verticals VHF

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