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https://www.satsig.net/cgi-bin/yabb/YaBB.pl VSAT technology and installation >> iDirect Forum: hubs and terminals >> UPC https://www.satsig.net/cgi-bin/yabb/YaBB.pl?num=1294807600 Message started by DeanFM on Jan 12^th, 2011 at 4:46am

Title: UPC
Post by DeanFM on Jan 12^th, 2011 at 4:46am

Hi,

Any recommendation for integrated UPC for Idirect Hub operated in L-band?

Thank's

Title: Re: UPC
Post by xenogears on Jan 19^th, 2011 at 9:10pm

Hi

We have an AUPC MITEQ in hour hub.
We choose:
-Mode: open loop
-Power ratio:1,4 dB
-Sample time: 1 s
-Max step size: 1 dB

Now for calibration:
Adjust the "clear sky condition" to 0 dB attenuation and save it. Then you can insert a variable attenuator between the beacon receiver and the UPC or depoint your dish by step of 1 dB. Save your point in the UPC but be careful to stop before saturate your amplifier!

Very important thing: never save two point too close from each other. The UPC can oscillate and saturate the ampli so you will see CRC error on your remote.
Aso, verify you beacon receiver, you need 1 dB for 1 V.

Best regards

Title: Re: UPC
Post by DeanFM on Jan 20^th, 2011 at 5:28am

Thank you for your information, xenogears...

Title: Re: UPC
Post by xenogears on Jan 20^th, 2011 at 7:09am

Erratum: Insert the attenuator between the LNB and the beacon receiver!

Title: Re: UPC
Post by Eric Johnston on Jan 20^th, 2011 at 10:29am

It is worth contacting the satellite operator for advice also. They may have some rules regarding the use and configuration of uplink power control.

If your power amplifier saturates you will interfere with adjacent carriers.
If your transmit power goes up, by mistake, in clear sky conditions, �due to some local attenuation anomaly with your LNB cable connectors or beacon receiver then you may cause serious problems to the satellite transponder.

References:
https://www.miteq.com/products/satcom/tns/MITEQ%20Tech%20Note%2025T029.pdf
https://www.miteq.com/satcom/pdfs/d218_MITEQ_Uplink_Power_Control.pdf

Best regards, Eric.

Title: Re: UPC
Post by DeanFM on Jan 21^st, 2011 at 7:58am

Eric,

Thank's for the advice. I just contact the local miteq here to discuss it further more. I hope they can provide total solution for this.

Regards