X-Band EOS System > Combined X/L-Band Option

If reception of NOAA HRPT, Metop AHRPT or FengYun-3 AHRPT data is also required using the same antenna system, additional RF components and receiver rack modules can be supplied to allow that.

The X/L-Band feed has 4 dipoles spaced 90° apart around the outside of the X-band scalar feed, and a quad hybrid combiner. The L-Band signal is fed to a pre-LNA 3-pole cavity filter followed by a single stage LNA, 4-pole combline bandpass filter and block downconverter. An additional RF cable feeds the L-Band signal from the antenna system to the second RF input on the receiver rack, where a low-rate demodulator converts the RF signal back to a binary data stream which is byte-aligned and transferred via USB to the Polar Orbiter Ingester software running on the ingest PC.

Two versions of the low-rate demodulator are available. The LRD-100 provides reception of NOAA HRPT and Metop AHRPT data. The LRD-200B additionally provides reception of FengYun-3 L-Band data. Both have built-in Viterbi decoding for next generation downlinks, selectable RF inputs and IF bandwidths for multi-mode flexibility, RS-232 serial control for setup, tuning, mode selection and status, and an LCD display for status and signal level readout.

L-Band Pre-LNA filter specifications
Type 3-pole cavity filter
Passband 1680–1710MHz
Passband loss 0.15dB
Bandwidth –3dB ±86MHz centred on 1705MHz
Stopband loss 300MHz: –80dB
1200MHz: –35dB
1570MHz: –10dB
1866MHz: –10dB
L-Band LNA specifications
Type Single stage advanced E-PHEMT technology
Noise figure 0.5dB typical
Gain 20dB minimum
IP3 32dBm typical
Operating temperature –40 to +85°C
L-Band post-LNA bandpass filter specifications
Type 4-pole, Combline
Insertion loss 1.5dB max
Bandwidth 1690–1710MHz
L-band feed specifications
Type 4 dipoles with quad hybrid combiner
Polarisation RHC
L-Band block downconverter specifications
Noise figure 0.75dB typical
Input frequency 1682–1710MHz
LO frequency 1553.500MHz
Output frequency 126.5–154.5MHz
Converted bandwidth 50MHz @ 3dB typical
Conversion gain >50dB, 55dB typical
Image rejection >60dB
Input/output impedance 50Ω
Output 1dB comp. point >+14dBm
LO stability ±2.5ppm (–30 to +60°C)
LO type Internal PLL locked to TCXO
Phase noise –103dBc/Hz @ 10Hz typical
–130dBc @ 100kHz
Input voltage 10–15V DC @ 350mA typical powered via IF output cable
Operating temperature –40 to +60°C
Operating humidity 100%
L-Band low-rate demodulator specifications
  LRD-100 LRD-200B
Signal input range –90dBm to –20dBm –90dBm to –20dBm
IF conversion Direct 70MHz, up to 50Msps, 10-bit resolution Direct 70MHz, up to 50Msps, 10-bit resolution
IF bandwidth Programmable Programmable
Supported symbol rates 0.1–3.5Msps 0.1–3.5Msps
Demodulator modes BPSK, QPSK, PSK BPSK, QPSK, PSK, 8PSK, 16QAM
BPSK/QPSK performance BPSK/QPSK within 1dB of theoretical, 0.5dB typical BPSK/QPSK within 0.4dB of theoretical, 0.2dB typical
Convolution decoding Viterbi, rate ¾ Viterbi, rates ½ and ¾
RF inputs Simulator or signal, selectable Simulator or signal, selectable
Outputs 50Ω TTL clock and NRZ data 50Ω TTL clock and NRZ data
Display LCD, 16-character × 2 line LCD, 16-character × 2 line
Control interface RS-232 serial via USB serial adaptor RS-232 serial via USB serial adaptor

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