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Old March 7th 08, 08:34 PM posted to rec.radio.amateur.antenna
W4NNG W4NNG is offline
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First recorded activity by RadioBanter: Mar 2008
Posts: 4
Default WiFi Link from top of tower

Hello everyone

Like Mike, I also have the MFJ-1800. And boy was I surprised when none of
my shack full of type N to SMA adapters didn't work. I can't believe they
reversed the polarity of the center pins for WIFI SMA connectors. Urrrrgh
!!!

The router discussion is interesting I need to keep it simple. Of my
various goals one of them is to passively receive signals. At least at my
level of knowledge it will be best if the computer links directly to the
adapter.

Haven't had the chance to look around but I do like the Ethernet cable up
the tower suggestion. Is there a particularly good adapter for doing this?




"amdx" wrote in message
...

" W4NNG" wrote in message
...
Hello fellow HRO's

I've got a 50ft tower w/ rotor. Been thinking mounting a 2.4 Ghz WiFi
antenna on the rotor to see what it picks up in way of WAP / WLAN's

To get around cable loss problem was going to put a USB adapter at antenna
then run USB cable up tower. Have tested USB at ~ 5X it's spec'd range
but
suspect the 60 - 70' run will be way too long.

Anyone know of a way to 'remodulate' so to speak to 802.11 wirelessly link
the output from the antenna mounted adapter back to computer?

Thanks for any thoughts

Bob

W4NNG


Hi Bob,
I have done something similar to what you want to do. I picked up MFJs yagi
antenna MFJ-1800
http://www.mfjenterprises.com/man/pdf/MFJ-1800.pdf
and a $13.00 wireless USB adapter. I adapted an N connector to the wireless
USB adapter.
(a little troublesome, large connector, small adapter) I then connected the
N connector/adapter assy
to the yagi. I mounted the whole thing in a 4" pvc pipe. I purchased two 15
ft USB male to female cords.
I found I had intermitent performance, The problem was 30 ft of USB cords,
I cut back to one 15ft cord
and the ass'y works wonderfully. I can see over 20 wifi signals from where
I'm at, only 3 to 4 are strong
signals (over 50%, whatever that means). While trying to solve the
intermitent performance I did find
there are cords available with amplifiers built inline to extend the usable
USB cable length. I did not try
these I just moved my yagi. The others are way ahead of my knowledge
regarding the wireless router and
it's operation on top of your tower.
Mike