Started by Falling Hare, February 06, 2019, 07:36:46 pm
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QuoteCan I use a compliant VHF-FM handheld radio as a compliant mobile or base? A radio is classified by its use, and the NTIA specifications are different for handhelds and mobiles/bases. If you use a handheld as a mobile/base by connecting it to an external antenna, etc., then it must meet the specifications as a mobile or base. Some handhelds do meet these requirements. It should be noted that if you add an external RF amplifier, then the combination is not compliant unless the manufacturer has published compliant specifications for that specific combination.
Quote from: SarDragon on February 06, 2019, 09:09:42 pmAlso, adding an external antenna to a portable radio for use in a vehicle effectively turns it into a mobile radio, which usually has different performance specifications that the basic portable might not meet.
Quote from: Falling Hare on February 06, 2019, 07:36:46 pmI have started working in communications, which is a totally new and interesting field for me. The problem is that I have zilch knowledge of radio/communications hardware or even basic electronics. Have been using the old EF Johnson 5112 (version 4) handheld to get experience in voice communications on local Wing nets. The other day a 'ham' showed me how to attach a home-made antenna to the hand-held that almost doubled the performance & range. It is simply a wire about 18" long attached to a washer and inserted in the antenna well and then screwing the whip back into it's fitting. It works great but looks really funky; and I am while I am careful attaching it into the fitting I am concerned that it may be damaging the equipment in some way.My questions are:-Is there an aftermarket longer whip antenna that would work just as well and replace the standard 8 ½" whip antenna. Have tried a Baofeng NA-771 whip which fitted nicely but simply did not work. Can anyone recommend specific brands, brand numbers, etc.? (links appreciated).-Would love to use this in my car (it gets cold up here in the winter) so could anyone recommend specific magnetic roof antenna assemblies that would fit the EFJ 5112 (ver.4)? Complete out-of-the box assemblies would probably be best for me since you have probably forgotten more about electronics than I will ever know. (Again, links appreciated).The improved performance of the field expedient wire saves me having to drive 30 miles in to use the squadron base station when I have to get on the nets; would love something that looks more normal but gives me the improved range.
Quote from: EMT-83 on February 07, 2019, 02:01:10 amThe wire sounds like like a classic "tiger tail" which simply adds the other half of a dipole to the existing antenna. You're not modifying anything, just making the antenna more efficient.Likewise, using an external antenna doesn't change the specifications of a hand-held radio. It's still a type-accepted five watt radio, with a more efficient antenna. Adding an amplifier is obviously a different story.
Quote from: Lebovic on February 27, 2019, 02:36:43 am...I am just learning about using the radio pro words and way of speaking, and after learning the expense of buying my own equipment (could be thousands of dollars)...
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