Paradise P300 specifications Change, BUC/LNB, Tx/BUC, BUC Type Menu

6.12.2Change, BUC/LNB, Tx/BUC, BUC TYPE Menu

This screen is only available on P310 L-Band modems.

BUC Attached:[?] 1=None 2=Other 3=Std Ku 4=Ext Ku

5=Std C 6=INSAT C 7=PALAPA C

Change, BUC/LNB, Tx/BUC, BUC Type Menu 1

Options other than None or Other are only displayed if the FSK communications option is present within the P310, and refer to standard Paradise BUC’s (with which the modem can communicate by FSK). If you are using a non Paradise BUC, then please select Other and manually configure the BUC parameters.

The table below specifies the parameters for the listed BUC types:

BUC Type

None

Other

Std Ku

Ext Ku

Std C

INSAT C

PALAPA C

Lower Frequency Limit	Upper Frequency Limit	Frequency Shift
Modem IF +/- limits around user set SHF Frequency Shift
Modem IF +/- limits around user set SHF Frequency Shift
14.000 GHz	14.500 GHz	13050 MHz
13.750 GHz	14.250 GHz	12800 MHz
5.800 GHz	6.4250 GHz	4900 MHz
6.725 GHz	7.025 GHz	5775 MHz
6.425 GHz	6.725 GHz	5475 MHz

The difference between None and Other is that with Other the operator can configure the modem to supply a 10MHz reference and a DC PSU to the BUC (if the internal BUC PSU option is fitted). With None, these options are not available.

If a Paradise BUC is fitted then the following screen is displayed:

Modem/BUC control mode: [?]

1=Independent 2=Terminal (Closed Loop)

Change, BUC/LNB, Tx/BUC, BUC Type Menu 2

INDEPENDENT The modem and BUC are both manually controlled from the modem front panel (the modem as normal, and the BUC with Change, BUC/LNB, Tx/BUC). The operator maintains control of the BUC Tx on/off status, and any BUC attenuator available. The modem does however automatically report the IF frequency to the BUC so the BUC may select the correct power calibration table for the monitored power reported back to the modem, viewable under Monitor, BUC.

It is advisable to keep the BUC attenuator at maximum attenuation to avoid overdriving the BUC input stages, unless there is considerable cross site cable loss. Fine (0.1dB power control is done with the modem (Change, Tx, Mod, Power), whereas the BUC attenuator provides 1dB adjustment steps. If the desired carrier power cannot be achieved with maximum BUC attenuation, then there must be considerable cross site loss and so it is safe to reduce the BUC attenuation. It is advisable to keep the modem carrier power several dB away from either the upper or lower modem power end stop, to provide future fine adjustment range.

Initial power adjustments must be made `off satellite`. The measured BUC power can be viewed using Monitor, BUC.

P300H P300 Series Modem Installation and Operating Handbook Page 109