Orbital Low Noise Block Downconverters

• Overview
• Features & Options
• Product Specs
• Applications
• Pricing & ORDER

Custom Engineering

• Begin with the low noise figure of a proven quality LNB
• Change the LO circuitry from DRO to External Reference PLL
• Optimize Input and Output for superior VSWR
• Modify and tune RF & IF filters for optimum response
• Tune for very low bandpass ripple
• Optimize Gain distribution for your system parameters
• Temperature compensated gain

Environmental

• O ring sealed connectors for weather resistant operation

Options

• Other input / output frequency ranges available
• Loss-of-Lock-Alarm option for redundant switch operations
• Full test documentation available
• Other colors available

Loss of Lock Alarm – LOLA (optional)

LNBs can lose oscillator lock from internal failure or loss of the 10 MHz reference. The LOLA detects this anomaly and increases the current consumption of the LNB over the IFL cable to trigger a redundant switch or other detector. No extra ports, cables or infrastructure are required.

Simply hookup the LNB with 10 MHz present, set the current windows on the redundancy system so they are just out of triggering, then turn off the 10 MHz to trigger the LNB LOL circuit. The redundant switch should activate. Restore 10 MHz and the LOLA will reset.

It should be noted that these LNBs are exceptionally good for 10 MHz lock range. They will stay locked under adverse 10 MHz conditions and keep the system in sync.

Orbital Ka Ext Ref LNB Specifications

Click to download specs & mechanical PDF

Two-Tone spec

The two plots below compare gain linearity for the new Orbital design with competitor designs. Two tones at 20.200000 GHz and 20.200100 GHz are injected into the LNBs to provide 0 dBm out. The first spur in the Orbital design is over -40 dBc down compared to the multiple spurs on the competitive LNB starting at only -10 dB down. Intermodulation (IM) distortion for a given output is reduced in the Orbital LNB while providing higher overall gain, 60 dB minimum for the Orbital LNB, versus 55 dB for the competitor LNB.

The LNB has to amplify the multiple signals from the satellite by a factor of a million (60 dB) without adding
significant noise (noise figure), but also to perform this conversion without adding distortion. The above graphs
represent the comparative levels of distortion between the Orbital design and competitive designs. Basically, if
you put two signals into the LNB, you should get two signals, and only two signals, out. You can imagine the
mess using a poor quality LNB when you amplify and convert the dozens or even hundreds of signals from the
satellite.

While an LNB would never be operated at 0 dBm output level, the test and design represent the linear
conversion quality of each LNB and the P1 dB compression point. The Two Tone tests are proxies for the
quality of conversion that is absolutely necessary for low bit error rate satellite transmissions. LNB non-linearity
starts at much lower levels than 0 dBm output, and the 2 tone test is the best method of comparing the quality of
design and manufacture of LNBs. The ultimate benefit to the end user is lower noise figure, higher conversion
gain, and most importantly, lower bit error rate for their digital transmissions.

Orbital Ka Isolator

The Orbital isolator is designed to shorten the overall length of conventional Ka LNB/Isolator combinations thus
reducing overall weight, cost and waveguide stress on system installations. As well, by tuning the isolator and
LNB together, the input insertion loss is reduced and C/N is optimized.

The unique look is in the screws. This custom manufactured isolator has been designed to accept slotted hex
standoffs that fit in the body of the unit, allowing it to be flush mounted on the LNB, which in turn allows easy
mounting of other components.

How to order an Orbital 694X Series Ka Ext Ref LNB

For pricing options please call 1-604-856-0305 or contact us.