J-POLE
When Michael Martens, callsign KB9VBR, set out to make his first J-pole in 2001, his drive was purely utilitarian–the local ham club was setting up APRS digipeaters around town and he figured it might be cheaper to fabricate his own antenna. The J-pole is typically one of the first antenna designs an aspiring homebrew-ham attempts. With simple, inexpensive components and relative ease-of-use, the J-pole is a great gateway into the world of antennas, and it offers some additional technical benefits as well. Michael knew this and decided to give it a try.
Fast-forward several years and Martens is at the helm of a thriving, industry-leading J-pole antenna operation. KB9VBR Antennas, located in the heartland of Wisconsin, may not be a large electronics equipment manufacturer, but when it comes to J-poles, they pretty much own the market. (Just Google ‘j-pole antenna’–theirs will be the first website after Wikipedia.) Martens has received praise for his antennas from all over the world, and has even garnered recognition from Hollywood and some other publications. Most recently, the set designer of the…. READ MORE
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CENTREVILLE — When 300-plus bike riders hit the roads in Queen Anne’s and Kent counties on Saturday, June 27, 17 amateur radio operators will man seve... Read more
This release completes the work related to the callsign lookup re-write, slow QRZ lookups, and an “Encountered an unspecified error” in DM... Read more
The BM-10 headset was designed to be a lightweight (only 3 oz), articulate sounding boomset that is ideal for DXpeditions, mobile, and general rag che... Read more
Designed and manufactured by SOTABEAMS, this neat bandpass filter is for use with handies (HT) in areas with multiple transmitters. In such areas, man... Read more
“Hi all, The latest edition of The 5 MHz Newsletter – No.17, Summer/Autumn 2016 – is now available for free PDF download from the RS... Read more
Main functions: Always used one same – three to one – module. Put together up to four module expand up to 12 inputs. Available add same mo... Read more
B1 specification ◇ Radio 136-174, 400-470Mhz, FM Wide/Narrow, DMR Tier II ◇ Suitable industry: ◇ Industry Police/Security/Railway/Critical communicati... Read more
The PiHPSDR Controller is a stand-alone interface for the ANAN/OpenHPSDR Hermes SDRs, it is ideal for mobile applications and for users who prefer phy... Read more
The ARRL Repeater Directory ® — introduced this week for 2015-2016 — has a newly launched companion app for Apple® iOS® devices. iPhone®, iPad®... Read more
FT-891 HF+50Mhz ALL MODE MOBILE TRANSCEIVER The FT-891 HF All Mode Mobile Transceiver once again continues Yaesu’s legacy for legendary receiver... Read more
General Amateur Radio Exam part 5. Volunteer Examiners, good operator practices. Reactance demonstration. Read more
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Ham Radio Deluxe 6.7.0.262 release
Heil BM-10 Headset
144 MHz filter stops interference
The 5 MHz Newsletter – No. 17, Summer/Autumn + Band Plan
12×4 modular Antenna switch KIT
RFinder B1 Manual Programming – RFinder Android Radio
PiHPSDR Controller – Apache Labs
New iOS App Available for The ARRL Repeater Directory ®
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YAESU FT- 891 First Test [ Video ]
Ham College 34: Reactance Demonstrated