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Ex Member
Ex Member

Mar 18th, 2010 at 8:01am  
Hi Sir ,

We are using different kind of  Ana Sat sspa for uplink transmission. In that while we are making power adjustments   the tx -in and tx- out values will be changing .

But we dont know what are the maximum leves for tx in and tx out ..  we have gone through manuals also and it was not specified .
We are using  AnaSat 125SEC Transceiver,AnaSat 20EC Transceiver and  AnaSat 16Ku Transceiver .

So kindly tell us what are the maximum tx in and tx out levels it can be reached without damaging equipment.

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Eric Johnston
Senior Member

Posts: 2109
Reply #1 - Mar 18th, 2010 at 12:10pm  
Download the manuals:

The maximum output levels (single carrier) correspond to the -1dB compression points.  Operate below this if possible. Maximum input levels will vary according to the gain you set.  If you operate multicarrier then your total composite output power must be much lower to as to not cause intermodulation interference.


Caution:  These transceivers have output waveguide powers that are hazardous so make sure the transceiver is connected up to antenna (or suitably rated dummy load) before powering on.  The transceivers come with mute set to off, so will transmit anything entering the IF TX in socket (e.g. local radio stations).  

Don't transmit till the hub tells you, and then start with a very low level CW carrier (e.g. -20 dB below nominal).

Only once the hub can see your signal, increase the level slowly.  Be very careful typing in gain or level settings.  Carefully monitor the transceiver output (M&C interface) so you don't exceed the output level.  

If anything seems wrong or signal not visible then stop, don't increase levels further.  Be ready with emergency mains power off if you panic.

My experience is that it is best to operate the transceiver towards the lower end of its gain range.  This minimises the risk of someone accidentally setting a modem output at too high an output level and damaging the BUC.

The M&C interface shows the actual input and output levels.
Best regards, Eric.
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Ex Member
Ex Member

Reply #2 - Mar 22nd, 2010 at 6:52am  
thank you sir
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