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VHF Aviation FBO Antenna
Hello , am looking for advise on a VHF Omni directional antenna for a small
fixed base operation , looked at a commercial ant. and the price is a little high for a 1/4 wave vertical , am sure the quality is there but am wondering if I could modify a Ringo or something else to work just as good , would have it resonate on 123.000 as this is our Unicom freq., a little gain would be OK . Thanks Phil L. W8KLK |
#2
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VHF Aviation FBO Antenna
On Sun, 22 Jan 2012 23:43:13 -0500, "Phil" wrote:
Hello , am looking for advise on a VHF Omni directional antenna for a small fixed base operation , looked at a commercial ant. and the price is a little high for a 1/4 wave vertical , am sure the quality is there but am wondering if I could modify a Ringo or something else to work just as good , would have it resonate on 123.000 as this is our Unicom freq., a little gain would be OK . Thanks Phil L. W8KLK Have you looked at RST? Regards, Bob KA7HLB |
#3
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VHF Aviation FBO Antenna
"Phil" wrote in message ... Hello , am looking for advise on a VHF Omni directional antenna for a small fixed base operation , looked at a commercial ant. and the price is a little high for a 1/4 wave vertical , am sure the quality is there but am wondering if I could modify a Ringo or something else to work just as good , would have it resonate on 123.000 as this is our Unicom freq., a little gain would be OK . Thanks Phil L. W8KLK Phil, Why don't you build a J-Bar? http://www.soaridaho.com/Antenna/J-Bar_Antenna.htm Or even simpler, sting the following antenna in side a vertical piece of PVC pipe. http://www.soaridaho.com/Antenna/ Wayne W7ADK |
#4
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VHF Aviation FBO Antenna
On 1-23-2012 04:43, Phil wrote:
Hello , am looking for advise on a VHF Omni directional antenna for a small fixed base operation , looked at a commercial ant. and the price is a little high for a 1/4 wave vertical , am sure the quality is there but am wondering if I could modify a Ringo or something else to work just as good , would have it resonate on 123.000 as this is our Unicom freq., a little gain would be OK . Thanks Phil L. W8KLK Of course, there is always the standard 1/4 wave antenna made with an SO-239 chassis mount antenna connector. 1/16" brass rod from Menards/Home Depot, etc. works great for the elements. At 123 MHz, the vertical element for the center pin should be just shy of 23" total from tip to bottom of the solder cup on the connector (22.83" to be exact, but not extremely critical) and the radial elements should be about 24" and bent so they droop at a 45 degree angle. A standard PL259 connector fits nicely inside a piece of 3/4" copper water pipe. You can cut some slots about 3/4" long in the end of the pipe with a hacksaw , slide the PL259 in until the SO239 bottoms out against the pipe and secure with a hose clamp. I would use a short piece of copper pipe as a long 10' piece might be apt to bend over in high winds. http://www.hamuniverse.com/2metergp.html |
#5
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VHF Aviation FBO Antenna
I just designed and made one for the son of one of my students. It
cost us about $5 in bits and pieces. I've posted it to my public folder on Dropbox ) It will appear in Kitplanes this May if you want to wait that long. Use it with my compliments. Jim On Sun, 22 Jan 2012 23:43:13 -0500, "Phil" wrote: Hello , am looking for advise on a VHF Omni directional antenna for a small fixed base operation , looked at a commercial ant. and the price is a little high for a 1/4 wave vertical , am sure the quality is there but am wondering if I could modify a Ringo or something else to work just as good , would have it resonate on 123.000 as this is our Unicom freq., a little gain would be OK . Thanks Phil L. W8KLK |
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