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Message started by chaady on Nov 3rd, 2012 at 12:11pm

Title: problem modem ka band
Post by chaady on Nov 3rd, 2012 at 12:11pm
dear all

I have problem with modem ka band
please if any one can help me
see attachment of photo for status of the modem
by the way change cables and change modem to other system the same result


(edited by forum admin. was  http://postimage.org/image/rpsv8xhon/ please see the link)

Title: Re: problem modem ka band
Post by Forum Admin on Nov 3rd, 2012 at 4:02pm
Try clicking on IFL > for more details.

Check the cable and F connectors using a DC ohms meter.
Bring both ends close together and check for open circuit, high resistance or short circuit cable / connectors. If short circuit check that no fragments of braid sheath or braid wire are short circuiting between centre conductor and outer.

The centre pin of an F connector should protrude about 2 mm beyond the front rim of the plug. The end of the pin should preferably be pointed sharp, so it pushes smoothly into the hole.  It is important that the pin does not get stuck and then cause the cable to be pushed back within the plug body. A smear of electronic grade contact grease on the pin helps.  The entire outdoor F connector must the sealed from moisture.

An excessively short centre pin will not make contact.  An excessively long pin may premanently damage internal components of the modem or LNB/BUC.  Use firm finger tightness only to screw in. Forceful use of a spanner will damage internal components.

The majority of VSAT faults are due to poor workmanship with the F connectors or lack of precision with the dish pointing.

Title: Re: problem modem ka band
Post by bigdishsat on Nov 5th, 2012 at 7:41pm
The modem status screen is just a guide ... it's not a precision diagnostic instrument. I've seen this screen before and the problem turned out to be the Tria.

As you have already replaced the cable (and followed Eric's guidelines on terminations) then the Tria is the most likely suspect ... time to speak to your supplier.

Title: Re: problem modem ka band
Post by dirkovision on Nov 6th, 2012 at 3:19pm
looks to me the F-connector is connected to the wrong female. It should be connected at the side where the earth-cable screw is.. from feedhorn direction: Right..

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