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Ham Radio . Magnum Experimentum

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

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  • Home
  • Radio Shorthand
    • Morse Abbreviations
    • Morse Code
    • Phonetic Alphabet
    • Q Signals
    • RST Signal Report
  • Tech Talk
    • Antenna Gain
    • Antenna Counterpoise
    • Digital
    • Logging Software
  • Amateur Radio, Why?
  • About
    • Privacy Policy
    • Terms and Conditions
    • Request Account
    • Contact
    • Sitemap
    • Advertise
  • Subjects
    • Activities
    • Antennas
    • contesting
    • Connectors
    • Digital Modes
    • EmComm
    • Installations
    • interfaces
    • Introspection
    • Lab Shootouts
    • Miscellaneous
    • mobile
    • NEC Shootouts
    • News
    • Operating Tips
    • power supply
    • Accessories
    • Promoting
    • Propagation
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    • Radios
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UHF

Articles about UHF antennas, radios, etc.

Where a choke chokes

January 1, 2021September 20, 2018
N9TAX Slim Jim Antenna choke under test.

I measure one example of a ferrite coax choke for response over frequency to understand its suitability for VHF and UHF.

Categories Antennas Tags choke, common mode, ferrite, J-Pole, measurement, N9TAX, S21, UHF, VHF

Diamond NR770HBNMO vs. Comet M-24M

February 18, 2020May 10, 2018

The Diamond Antenna NR770HBNMO paired with their K515S insulated luggage rack mount provides measurable and observable upgrade for my 2015 Subaru Forester 2m/440 mobile.

Categories Antennas Tags 2m, 440, 70cm, Comet, Diamond, EFHW, end-fed, Forester, K515, M-24M, measurement, mobile, NR770HBNMO, roof rack, Subaru, UHF, VHF

The need for 9600 bps AX.25

August 1, 2016
Where AX.25 fits into the ARS digital landscape

Despite its age AX.25 can compete with the slick newer digital technologies. Let’s see where packet fits into the digital landscape.

Categories Digital Modes Tags 802.11, ax.25, HF, MF, packet, packet radio, UHF, VAPN, VHF

Mast Mountable J-Pole Antenna

December 8, 2017June 17, 2015
Overview highlighting novel features of mast mountable j-pole antenna.

The J-Pole antenna’s long and storied design history is due for one more chapter to mitigate the longstanding mast current and reliability issues.

Categories Antennas Tags inductance, J-Pole, Simulation, stub, UHF, VHF

APRS AT Golden Packet 2014 NoVA Report

March 5, 2015July 21, 2014
Hawksbill ATGP crew 2014

2014 Appalachian Trail Golden Packet report from Hawksbill (aka Northern Virginia) Station #6

Categories Activities Tags APRS, Golden Packet, Hawksbill, speaker stand, UHF, VHF

Repeaters, Antennas & Trigonometry

February 22, 2014February 20, 2014

You need an antenna with energy at high take off angles to hit the hill top repeaters… right? Well, not likely. Let’s review the details and do the math to understand what’s needed for VHF terrestrial radio communication.

Categories Antennas Tags 1/4 wave, 2m, 5/8 wave, 70cm, Aviation, repeater, UHF, VHF

Hoverman TV Antenna Measurements

March 5, 2015February 16, 2014
Hoverman VHF Elevation Measured Antenna Pattern

Doyt Hoverman’s 1960s TV antenna design placed over a simple reflector screen provides impressive performance for today’s UHF and VHF-HI television bands.

Categories Antennas Tags DTV, Hoverman, measurement, TV, UHF, VHF

Baofeng UV-5R HT – Low Cost, High Value

October 20, 2013October 9, 2013

The Baofeng UV-5R provides modest quality with a low price yielding high value. This HT can literally be a Christmas stocking stuffer.

Categories Radios Tags 2m, 70cm, Baofeng, HT, UHF, UV-5R, VHF

Superbowl HDTV Antenna

March 5, 2019January 4, 2013
Hoverman Antenna Zigzag Elements

Build the venerable Hoverman TV antenna and watch digital broadcast high definition HDTV television this weekend. This version of a HDTV antenna uses amateur radio antenna building techniques to make a lightweight structure.

Categories Antennas Tags DTV, DX-Eng., kj4faj, kx4o, measurement, NEC, preamp, resin support blocks, rotator, Simulation, speaker stand, UHF

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

‘UHF’ Connector Test Results

January 11, 2017October 3, 2011
Insertion Loss of Various Connectors

Real measured data reveal the UHF (PL259 and SO239) connectors have real limitations.

Categories Connectors, Lab Shootouts Tags BNC, measurement, N, PL259, SMA, TNC, UHF, UHF connector

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Topics & Keywords

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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