X-Band EOS System Combined X/L-Band Option
If reception of L-Band NOAA HRPT and Metop AHRPT data is required using the same antenna system, additional RF components can be supplied to allow that.
If L-Band GOES HRIT or GEO-KOMPSAT-2A (GK-2A) LRIT/HRIT reception between polar-orbiter passes is also required, again using the same antenna system, a USB interface and additional software can be supplied.
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 system interface rack. The RF module downconverts the signal to a common frequency of 140MHz and feeds that to the demodulator which converts it back to a binary data stream. HRPT and AHRPT data is byte-aligned and streamed via a TCP socket to the Polar Orbiter Ingester software running on the ingest PC.
A USB interface and Geostationary Ingester software can be supplied for GOES HRIT or GK-2A LRIT/HRIT reception between polar-orbiter passes. This is fed by the demodulator clock and data outputs and forms a byte-aligned binary data stream which is fed via USB to the Geostationary Ingester software running on the ingest PC.
L-Band Pre-LNA filter specifications
|Type||3-pole cavity filter|
|Bandwidth||–3dB ±86MHz centred on 1705MHz|
|Stopband loss||300MHz: –80dB
L-Band LNA specifications
|Type||Single stage advanced E-PHEMT technology|
|Noise figure||0.5dB typical|
|Temperature||–40 to +85°C operational|
L-Band post-LNA bandpass filter specifications
|Insertion loss||1.5dB max|
L-band feed specifications
|Type||4 dipoles with quad hybrid combiner|
L-Band block downconverter specifications
|Noise figure||0.75dB typical|
|Converted bandwidth||50MHz @ 3dB typical|
|Conversion gain||>50dB, 55dB typical|
|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|
|Temperature||–40 to +60°C operational|