Where a choke chokes
I measure one example of a ferrite coax choke for response over frequency to understand its suitability for VHF and UHF.
UHF
Articles about UHF antennas, radios, etc.
Diamond NR770HBNMO vs. Comet M-24M
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.
The need for 9600 bps AX.25
Despite its age AX.25 can compete with the slick newer digital technologies. Let’s see where packet fits into the digital landscape.
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.
APRS AT Golden Packet 2014 NoVA Report
2014 Appalachian Trail Golden Packet report from Hawksbill (aka Northern Virginia) Station #6
Repeaters, Antennas & Trigonometry
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.
Hoverman TV Antenna Measurements
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.
Baofeng UV-5R HT – Low Cost, High Value
The Baofeng UV-5R provides modest quality with a low price yielding high value. This HT can literally be a Christmas stocking stuffer.
Superbowl HDTV Antenna
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.
Extreme NMO – Subaru, Silver and the 60″ Whip
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.
‘UHF’ Connector Test Results
Real measured data reveal the UHF (PL259 and SO239) connectors have real limitations.