rx but no tx

Viasat VSAT high-speed terminals and hubs. Experiences on LinkStar, LinkWay, Link Star DVB S2 and Link Way DVB S2 Internet via satellite platforms.

rx but no tx

Postby EDWIN » Sat Oct 06, 2007 7:09 pm

I have an Rx connection but there is no Tx. The LED status on the SAT LED is blinking very slowly. The BUC and cables are in good condition. What should I do to establish TX connection?

Is it possible to have a signal lock of IS 1R on my analyzer, having all the equipments in good condition, the NOC seeing my terminal on their analyzer and yet be looking to another satellite?  If yes how do I get the terminal pointed correctly to the satellite?      

Re: rx but no tx

Postby SATCookbook » Sat Oct 06, 2007 11:52 pm

I assume the following:

This is a linkstar modem.
The antenna is peaked up.
The QPSK BER is good, 0.0005 or less.
The rx led is slow flashing green.

Your demod is locked to a carrier of about the correct frequency and symbol rate.

The decoding of the data PIDs etc does not match to your typed in configuration string. tclgets may show that pcr is not yet true. Check the configuration text string character by character, maybe a figure 0 is confused with a letter O for example. Ask your hub to send the string again. Read out the configuration from the modem and check that all the items are the same as what you typed in. Re-entering the whole lot may help if some invisible character typing error has previously occurred.

You need to get to the receive fast green flashing stage before worrying about transmitting.

If the hub can see your test CW transmit signal on their analyzer at normal level, you must be on the correct satellite. Verify it is from you by turning the carrier off and on while they watch it. Regarding which satellite, measure your elevation angle and compare with the calculated value for the wanted satellite.


Postby fs_vsat » Tue Apr 21, 2009 2:09 pm

I have same problem with IDirect 3000.
RX, Status and power are green.
Buy NO TX and Net is blinking orange.

Guide me please ...


Re: rx but no tx

Postby fluffymassive » Thu Jun 04, 2009 5:42 am

Check to make sure that the remote is activated in iBuilder, and that the remote has the correct lat/long in its configuration. Also to make sure that the BUC is good, put a CW carrier up and check on a spec an.

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