For this to work, one end needs to be very short. In a typical mountain-top repeat situation, the combined free-space path loss from BOTH paths is more than enough to prevent the link from working.

Greg Ihnen wrote:
Actually I've done this on ships where the deck department needed to communicate with the engine room and personnel down in compartments where winches for line handling were located. We're talking very short distances (less than the length of the ship - around a 1000 ft) and short cable runs. But it did let enough RF leak into the below deck areas to facilitate communications.

Greg

On Jun 7, 2010, at 4:34 PM, Bob Moldashel wrote:

  
Garbage......

Let's say optimum consideration here...

Present RSL  -68 db ....Subtract cable loss  -2 dB  = -70  Add +24 db 
for the Grid  =  -46 

Free Space Loss at 1/10th of a mile is -84 db

Soooooo... 

If you take the -46 dB level out and add the FSL of -84 dB that will 
give you a -130 dB.

I don't think that will work......

Get a repeater or get a stronger receive signal at your receive 
antenna.  Like -20dB

-B-




Steve Barnes wrote:
    
Ok I have never even thought about doing this.  Does it actually work?  This sounds WAY to simple.  

A 29Db Grid on a Grain Leg  pointed at the AP that has a -68 signal plugged into a 24 DB Grid Pointed to the house 1/4 mile away.  What kind of signal would you have on the back side at the house?

Steve Barnes
RC-WiFi Wireless Internet Service


-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Rubens Kuhl
Sent: Monday, June 07, 2010 4:20 PM
To: WISPA General List
Subject: Re: [WISPA] Repeater

One option to consider is a passive repeater. Wire a coax cable between the two dishes and you are done... no electronics to fail, no power to supply on a remote location.

(haven't tested this trick with dual polarity, though)


Rubens


On Mon, Jun 7, 2010 at 11:00 AM, Steve Barnes <st...@pcswin.com> wrote:

      
I have avoided repeaters like the plague but I have a situation where I have one and I am looking for a better option.  When I started my wisp I was 100% Tranzeo.  At this one location I setup a CPE connected to a TR-6000 that has 2 Ethernet ports that pass through POE.  I ran 1 Ethernet up the tower with a POE at the bottom, and a crossover in between.

I would like a similar layout for other locations.   Issue I see is that not many other units, UBNT or MT have a 2nd Ethernet that pass through POE?

How does everyone you get around this?

Trying to stay cheaper than a RB433, 2 radios, and 2- antennas, box, pigtails, 2 LMR cables.

Steve Barnes
RC-WiFi Wireless Internet Service


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