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Comant VHF Communications Antenna CI-122
MFR Model# CI-122
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Overview
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Frequencies Covered Designed specifically for mounting to the underside of an aircraft providing excellent radiation coverage for air-to-ground VHF communications. Bent configuration makes it ideally suited for helicopters and low wing aircraft. The CI 122 has been re-tested and upgraded to the new RTCA DO-160D environmental requirements and offers 118 to 137 MHz frequency associated with the DO-186A MOPS. Note: Comant Antennas no longer come with a gasket or template. Must order PN 09-05579 separately. Applications |
Click here to go to Cobham Rebate Website for full Terms and Conditions. |
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. |
Specifications
MODEL- CI 122 VHF ANTENNA | |
Electrical | |
Frequency | 118-137 MHz |
VSWR | 3.0:1 Maximum |
Polarization | Vertical |
Radiation Pattern | Omnidirectional |
Impedance | 50 Ohms |
Power | 50 Watts |
Mechanical | |
Weight | 0.75 lbs. Max. |
Height | 18.50 in. Max. |
Material | Cast Housing / Stainless Whip |
Finish | Polyurethane Enamel |
Connector | BNC (Female) |
Environmental | |
Temperature | -55ºC to +85ºC |
Altitude | 50,000 ft. |
Airspeed | 350 Knots TAS |
Federal Specifications | |
RTCA Environmental | DO-160D |
FAA TSO | C37d, C38d |
Gasket | |
B12607-3 | Cork Neoprene |
Documents
- Tech Data and Specs (PDF)
Reviews
Great!
Verified Purchase
Comant CI-122 VHF Comm Antenna BNC
No way to tell I just install
Verified Purchase
Comant CI-122 VHF Comm Antenna BNC
Fixed my issue. Shipped fast and was damage free. Easy install and clean.
Verified Purchase
Comant CI-122 VHF Comm Antenna BNC
Quality as expected !
Verified Purchase
Comant CI-122 VHF Comm Antenna BNC
Ordered, arrived, installed works as advertised...
Was having trouble with reception ... had an old antenna and decided to replace. The clarity has changed completely. Wish I had done a lot sooner.
Works great as advertised and expected. Quick and easy to install.
Fits exactly as advertised
From my previous product review, the previous set up I had with the top mounted VHF, it was too close to the sensitive ACK-406 (updated and enhanced ELT). The RMI radio magnetic interference from the transmissions of VHF so close into the ELT antenna caused the red power light of the remote on the ACK to come on. Ostensibly this is why we were gettting so much static in our headsets when transmitting. No static for RX of VHF. Also I learned that if you have GPS nav as in a Garmin navigator, an interpheference test needs to be done. Top mounted VHF with top mounted GPS antenna created a fail situation for me. The bottom mounted Ci-122 solved all my issues. Could not be more pleased.
Was advised by our local avionics shop owner, based on my issue to remove my top fuslage mounted VHF antenna and get the Comant Ci-122 bottom mount. What I was having an issue with was scratchiness in our headsets upon transmission airborne only. In general ATC said the quality was so so but readable. Other symptoms included the red power light on our remote panel for our ACK-406 ELT coming on when we transmitted. GPS interference test failed also, that is a simple test, transmitting on certain frequencies then seeing if the bar graph drops off of the GPS signal strength on the settings page of your GPS unit. When I put the Ci-122 on the bottom and removed the top VHF all issues solved. Improved VHF TX and less to no feedback in headsets. No red light on ACK remote and GPS interference gone.
Q&A
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
The total height is 18.5 inches long, as the CI-122 is a bottom mount antenna it is bent.
Per the manufacture it is 8.75" from the base of the antenna to the bend.
No, this is the price for the antenna only. Connectors and BNC connectors are sold separate.
For part number 11-17922 the length of the screw depends on the mounting location. The mounting holes are .173 diameter and countersunk AN hardware is recommended.
The CI-122 (11-17922) does require a ground plane if mounted on a fiberglass airplane. The height of the antenna is the required diameter of the ground plane. Aircraft material does not change the VSWR of the antenna.
On certified installations, we recommend using either RG400 or RG142.
This has a footprint for four (4) holes.
Correct, Comant recommends forming a seal using part # 09-04612 which is a Chemseal sealant.
