Modifying the FD-150 Factory Antenna - Articles Forum at eHam.net

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Modifying the FD-150 Factory Antenna	Reply
by WX7G on June 26, 2009	Mail this to a friend!
I would be interested in the test fixture used to determine the antenna resonant frequency. For example, was the antenna mounted on a ground plane, hanging off a length of coax, or plugged directly into the analyzer? I wonder because if the measurement is in error the modified antenna may work worse than before modification.

RE: Modifying the FD-150 Factory Antenna	Reply
by N8EMR on June 26, 2009	Mail this to a friend!
hmm, I didnt think those were legal to import into the US since it has no FCC acceptance/compliance.

RE: Modifying the FD-150 Factory Antenna	Reply
by KC0ROM on June 26, 2009	Mail this to a friend!
n8emr, you do not need and fcc type acceptance to use that piece of equipment,read your part 97 rules. if you built a vhf/uhf radio and use it does it have f.c.c acceptance ? no,or a homemade amplifier ? no.......HERE'S YOUR SIGN. KC0ROM

RE: Modifying the FD-150 Factory Antenna	Reply
by K1CJS on June 26, 2009	Mail this to a friend!
They're not, but people are doing it anyway.

RE: Modifying the FD-150 Factory Antenna	Reply
by K1CJS on June 26, 2009	Mail this to a friend!
The use isn't illegal, the importing is, since those radios works on more than just the ham bands.

RE: Modifying the FD-150 Factory Antenna	Reply
by K9RFZ on June 26, 2009	Mail this to a friend!
Just ask K1CRA why they got cited by the FCC for advertising/selling a similar cheap Chinese radio in the USA. See http://www.w5yi.org/ama_news_article.php?id=266 for further details. Joseph, K9RFZ

RE: Modifying the FD-150 Factory Antenna	Reply
by K0BG on June 26, 2009	Mail this to a friend!
As the old adage says, a photo would have been worth a thousand words. And I too want to know how you actually measured the impedance, as SWR means nothing! Alan, KØBG www.k0bg.com

RE: Modifying the FD-150 Factory Antenna	Reply
by WB4TJH on June 26, 2009	Mail this to a friend!
I enjoy informative, tech articles, but some of them are beginning to remind me of a couple of old fools at the nursing home threatening each other with their canes and arguing over who got the bigger donut for breakfast....

Modifying the FD-150 Factory Antenna	Reply
by K1DA on June 26, 2009	Mail this to a friend!
Or you could buy a real radio from the big three.

RE: Modifying the FD-150 Factory Antenna	Reply
by KB1LKR on June 26, 2009	Mail this to a friend!
"And I too want to know how you actually measured the impedance, as SWR means nothing!" He didn't state SWR or the real part of impedance, only resonance using a VHF antenna analyzer, to determine the length required to be added (3.25") to reset it to resonate at 146MHz from 155MHz. All he needs to do now is drill the hole in his car's roof! (Can't disagree w/ you on this one though OM!) Photos would be great though.

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