Specifications

UHP-1000 SATELLITE ROUTER

INSTALLATION AND OPERATION MANUAL, V. 2.5

(SW VERSION 2.5.X)

2.5 High-speed demodulator (SCPC Rx)

Demodulator of the continuous signals is intended for reception of satellite channels transmitted by another UHP-

1000 router or by a special modulator. On the physical level, transmission format complies with DVB-S and DVB-S2

standards but the channel level is incompatible with DVB – there is no PID conception, etc. Instead, use is made of

the own encapsulation methods which are more efficient in transmitting IP-protocol.

2.5.1 Receiving signals from satellite

To receive signal (carrier) from satellite, it is essential to know at least four parameters:

 The satellite used in the network (antenna should be pointed to this satellite)

 Polarization (proper polarization should be selected on in the demodulator configuration or the receive

converter on the antenna should be turned to the required position if its polarization cannot be switched

over using its supply voltage)

 Carrier central frequency (enter its value in the demodulator configuration)

 Carrier symbol rate (enter the value in the demodulator configuration)

Satellite channel frequencies can be in three bands:

 Ku (10.7 – 12.5 GHz) – frequency at which satellite transmits the carrier

 C (4 – 5 GHz) – frequency at which satellite transmits the carrier

 L (950-2050 MHz) – frequency converted by the receive converter (LNB) and which is applied to the

router’s demodulator input

Reception of the signal is effected using receive converter (LNB). It performs two functions: amplification of the

weak signals and converting them to similar signals carried at a much lower frequency (called intermediate

frequency or IF). When converting the frequency, frequency of the local oscillator (LO) is subtracted from that of

the signal received by LNB from the satellite. LO frequency of various LNBs can be 10 GHz (professional

converters), 0.975 GHz and 10.7 GHz (domestic converters). LO frequency is usually written on the converter case

label or in its Manual.

There are double-frequency (wideband) converters containing two LOs with different frequencies. These

converters are switched over using frequency 22 KHz. UHP-1000 routers do not support 22 KHz control signals and

cannot switch LO in such converters. If converter switches the LO using voltage of 13/18 V, the router will be

capable of switching LO frequency.

Figure 14 Graphical example of the entire signal path via satellite and antenna system

If the satellite signal frequency is known in Ku-band, e.g. 11 215 140 000 Hz (or 11.215140 GHz or 11 215 140 KHz),

then knowing the LO frequency of the installed LNB (e.g. 9.75 GHz) one can calculate the value in the L-band.

11 215 140 000 – 9 750 000 000 = 1 465 140 000 HZ OR 1 465 140 KHZ

IF Tx 1000 MHz (L-band)

IF Rx 1000 MHz (L-band)

BUC LO (+13050 MHz)

LNB LO (-10000 MHz)

SAT LO (-3050 MHz)

RF Tx 14050 MHz (Ku-band)

RF Rx 11000 MHz (Ku-band)