W8OSP
Member
Anyone know of any manuf. that sells a high gain 70cm nmo antenna thats more than 5db gain??
Ive checked antenex, diamond and mfj i think.
Ive checked antenex, diamond and mfj i think.
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70cm High gain NMO ???
- Thread starter W8OSP
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Diamond makes one. 7.6dB
http://www.rfparts.com/diamond/sg7900nmo.html
It's going to be tall though. Just over 5'. Just out of curiosity, why such a high gain needed?
dsw
http://www.rfparts.com/diamond/sg7900nmo.html
It's going to be tall though. Just over 5'. Just out of curiosity, why such a high gain needed?
dsw
W8OSP
Member
Well I am putting separate antennas on the ride and want a high gain 2m and 70cm antenna. The antenna you linked is a dualband, guess I should have stated I need a single band 70cm high gain. I have found a very nice high gain 2m antenna at 6.2db, now if I can find a 70cm high gain one.
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WCHija
Member
Why cant it be dual band? I think you will have a tough time finding a single band in the Ham Bands. The CA2X4 gets good reviews.
http://www.hamcity.com/SearchResult.aspx?CategoryID=2198
http://www.hamcity.com/SearchResult.aspx?CategoryID=2198
I would agree. You probably won't find a mono band UHF antenna higher than 5 or so dB. Personally, I don't think you will notice a difference between 5 & 7dB. You'll be lucky if you get any additional s-units out of the 2dB gain you're searching for. You would be better off investing in high quality coax for your install, or just using the high gain dual band antenna for your UHF needs.
DSW
DSW
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
70cm higain nmo ant.
maxrad and larsen make hi gain uhf nmo antennas. Not sure of either part number or gain figures but it is a decent antenna, i use them at work for our Trimble RTK survey base data link antenna, i use both elevated feed and non elevated feed, no ground plane. On our data link repeater we use a maxrad elevated 1/4 wave or elevated hi gain. our data link channels are on both sides of and in the 70cm ham band.
Gain wise, i think unless you are in the rockies or just a real long ways from what you are listening to 5-6 db should be more than enough.
maxrad and larsen make hi gain uhf nmo antennas. Not sure of either part number or gain figures but it is a decent antenna, i use them at work for our Trimble RTK survey base data link antenna, i use both elevated feed and non elevated feed, no ground plane. On our data link repeater we use a maxrad elevated 1/4 wave or elevated hi gain. our data link channels are on both sides of and in the 70cm ham band.
Gain wise, i think unless you are in the rockies or just a real long ways from what you are listening to 5-6 db should be more than enough.
Beware of the gain specification. If it's listed as "dbi", that means the gain is referenced to an isotropic antenna, a theoretical construct that doesn't really exist. Subtract 2.15 DB gain from any antenna that's rated in dbi to get it's gain referenced to a dipole. That Diamond 7.6 dbi gain antenna is actually 5.45 db gain, as referenced to a dipole... which is back in the realm of most other gain type uhf antennas. 5 db or so is the most you're gonna find for mobile use.
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