(2019-11-10, 09:41 AM)abarrow Wrote: A regular marine VHF antenna is the right length for AIS. If you are using a telescopic antenna, extend it to 17 inches. I use an active splitter on my regular VHF marine antenna and it works well. Don't put a passive splitter on, as you will destroy your AIS receiver the first time you transmit on your VHF.
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OK, I'm confused:
If people are using VHF antennas for AIS, the 1/4 wavelengths cannot be optimal?
VHF 30-300MHZ
AIS 161.975-162.025 Mhz
OpenPlotter AIS-SDR tunes to GSM-850 (USA) near 889MHz, which IS much shorter wavelength just 0.084m - Help?
VHF center band is 165MHz or 1/4 wavelength 0.454m
AIS (162Mhz) prefers a 0.463 meter antenna
trying to be complete in my question, I answered my own question and will leave it here for posterity Searches8.77 millimeters difference is not a significant factor for most applications
The high frequency AIS GSM-850 channel Tuning around 889MHz is still confusing. . .
Cheers