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Location: Spain

Cross chain link failure

Sun Apr 19, 2015 7:02 pm

Duo chain backhaul link
Remote site is QRT, local site is rb911G-5HPnD

QRT has CH-0 = H-pol and CH-1 = V-Pol (Standard connection for all integrated MT antenna units)

Local site is 29dBi Jirious Duo-pol dome antenna with mentioned rb911. CH-0 should be connected to H-Pol of Jirious (side) and CH-1 should be connected to the V-Pol of the Jirious (top)

According rb911 I have a cross failure in Tx and Rx:

CH-0 Tx= -63 / Rx= -77
CH-1 Tx= -78 / Rx= -62

What can be the reason?

If one of the cables / pigtails or in anyway the connection between radio chain an antenna connector, is faulty I would expect only one of the chains has a poor Tx AND Rx? The other chain would work normal..

Can it be that the rb911 is cross connected? i.e. CH-0 to the V-pol antenna and CH-1 vice versa?
But according some quotes on this forum it should not make a difference.

Could it be it is cross connected AND one of the cables has a failure? So if I would change the connections at least one of the chains will have both Rx and Tx failing?
Show your appreciation of this post by giving me Karma! Thanks.

Rudy R. Puister

WISP operator based on MT routerboard & ROS.

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