Orbital Low Noise Block Downconverters

Orbital LNB4300 X-Band PLL Professional Series LNBs

1. Built-in Tx suppression Filter X-band VSAT systems have very narrow TX/TR spacing. (Rx: 7.25 - 7.75 GHz, Tx:7.9 - 8.4GHz). Because of this frequency spacing, LNB performance degradation such as 3rd order Inter-modulation (Im3) and Noise Figure is likely due to Tx leakage into the Rx path. Orbital has taken design measures to avoid these Tx interferences specifically by placing a Tx suppression filter in the LNB. The rejection filter is placed at an interstage of the LNB’s LNA and Tx leakage is suppressed more than 35dB over temperatures of -40 to +60 deg C. The result of the Tx suppression filter, IM3 issues produced by Rx and leaked Tx is resolved and NF degradation caused by Tx thermal noise is negligible with excellent image rejection of greater than 60dB.
   
   
2. High Output P1dB and IP3 Orbital LNBs have excellent linearity. Output compression point (P2dB) is greater than +15dBm and third order intermodulation intercept point (IP3) is +25dBm or greater.
   
   
3. Low Input VSWR Orbital is able to provide the optionally very low input VSWR LNB. Generally, LNBs are designed to optimize noise figure and as a result of this optimization, input VSWR increases To avoid the “Long Line Effect” between the antenna, feed components and LNB, Orbital places a waveguide isolator in front of the LNB giving a VSWR of 1.2 : 1. The isolator also decreases LO leakage by about 20 dB and creates unconditional stability under all conditions while adding minimal insertion loss. The X-band LNB is also available without the isolator, thus giving an increase in VSWR to 2 : 1, but getting an improvement in noise figure by removing the loss of the isolator.

PART NUMBER	LO	Input (GHz)	Output (GHz)	Band-width (GHz)	Satellite
LNB4300I Type A Series (With waveguide isolator) X-Band PLL LNB	6.30	7.25~7.75	0.95~1.45	0.500
LNB4300A Type B Series X-Band PLL LNB	6.30	7.25~7.75	0.95~1.45	0.500