nmo antenna tuned to 144.39 - APRS Forum at eHam.net

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eHam.net Forum : APRS : nmo antenna tuned to 144.39

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nmo antenna tuned to 144.39	Reply
by KD8EYF on October 31, 2009	Mail this to a friend!
im setting up a v8000 / tinytrack as a dedicated aprs mobile. i have a nmo magnet mount that i will use for the antenna mount until i drill a hole. can anyone recommend antenna that is made specifically for 144.39 with a nmo mount? im thinking 1/4 wave size or smaller.

RE: nmo antenna tuned to 144.39	Reply
by NA4IT on October 31, 2009	Mail this to a friend!
Any 2M antenna will work, as the 2M band encompasses 144 MHZ - 148 MHZ. de NA4IT

RE: nmo antenna tuned to 144.39	Reply
by KC9GMX on November 2, 2009	Mail this to a friend!
I could cut you a 1/4 wave NMO and sell it to you. www.hamiltonservice.com Or you could buy one from a local hamfest and cut it to be close to 1:1 at 144.39 Either way. Steven

RE: nmo antenna tuned to 144.39	Reply
by KD8EYF on November 4, 2009	Mail this to a friend!
Ok i got my setup going. I ended getting a larsen NMOQW144 which is apparently non-tuneable. O well its working good. However i am having another problem. When i track my location on aprs.fi my location is off 20 - 30 feet to the south east. Any ideas how i could fix this? I have a tinytrak3 / byonics gps2 package.

RE: nmo antenna tuned to 144.39	Reply
by KD8EYF on November 5, 2009	Mail this to a friend!
So does anyone have accuracy issues with the Byonics GPS2?

RE: nmo antenna tuned to 144.39	Reply
by KE7VUX on November 6, 2009	Mail this to a friend!
I think your 20-30ft is within the acceptable accuracy of the GPS system.

RE: nmo antenna tuned to 144.39	Reply
by KG6HXO on November 7, 2009	Mail this to a friend!
If you are using MIC-E, you might try switching to the regular APRS sentence, there is less "rounding". I concur that 20-30 feet is well within the circular error probability for a standard GPS receiver, but a lot of the time we just luck out and show in the right place anyway. Is your GPS antenna pointing straight up at the sky or out towards the horizon? You will get somwhat better results with the antenna pointing straight up. Allen AF60F

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