Broadband-Hamnet™ Forum :: Antennae
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 Subject :Best radio/antenna strategy?.. 2014-08-04- 09:01:31 
KM5L
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Joined: 2014-07-30- 20:34:40
Posts: 2
Location: Dallas, TX
 

Brand new to the Amateur side of microwave. Do some install the broadband up near the antenna? The loss is so high at 2.5 Ghz I guess I could mount the router up there somehow.  What are people doing and what results?

73,

Patrick KM5L
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 Subject :Re:Best radio/antenna strategy?.. 2014-08-04- 09:23:36 
K6AH
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Joined: 2012-03-05- 10:47:45
Posts: 181
Location: San Diego, CA
Yes. The Ubiquiti devices obtain DC power injected over the Ethernet data cable. They either have self-contained antenna, or RF connectors for immediate connection to external antenna. The little power they output (Linksys ~ 79mW; Ubiquiti up to 600mW) is precious. Andre, K6AH
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 Subject :Re:Best radio/antenna strategy?.. 2016-01-31- 04:02:10 
N4CVX
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Joined: 2015-10-19- 20:45:38
Posts: 2
Location: 
Clear answer, thank you! My question: If I mount a Ubiquiti device at the mast-head right below the antenna, and feed the device through the Cat5 cable with power, the only RF loss will be from the device to the antenna. Now, how about the difference in RF connectors. One of the popular directional antennas has "N" Type connection, I understand that the Ubiquiti devices have an SMA or reverse-SMA. Therefore all I need is a short cable with the SMA at one end and the N connector at the other end. Does this sound like I am in the ball park? BTW, I am a 1962 San Diego High School Graduate .. was back there for my 50th reunion a few years back and a nostalgic time it was -- first time back to SD since 1975. 73' Dave N4CVX, Brentwood, TN
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 Subject :Re:Best radio/antenna strategy?.. 2016-02-11- 15:55:49 
kd0lix
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Joined: 2013-09-01- 17:05:47
Posts: 4
Location: 

>If I mount a Ubiquiti device at the mast-head right below the antenna, and feed the device through the Cat5 cable with power, the only RF loss will be from the device to the antenna.


You'll have minimized your feedline loss(and this can be a doosie at 2+GHz), but any antenna mismatch and connector losses will be about the same.


>Therefore all I need is a short cable with the SMA at one end and the N connector at the other end. Does this sound like I am in the ball park?


It does. To be specific, the Reverse SMA you mentioned is usually called RP-SMA(Reverse-Polarity SMA), so if your radio's RP-SMA, and your antenna is type N, you'd need an RP-SMA to N pigtail. Like http://www.amazon.com/dp/B007G5LCCW/ or http://www.amazon.com/dp/B005HIJCB8/ although I haven't tested either cable assembly. -KD0LIX, Richard
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Last Edited On: 2016-02-11- 16:00:38 By kd0lix for the Reason
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