L3Harris Technologies Introduces New S-band Multimode Transponder for Satcom Applications

L3Harris Technologies Introduces New S-band Multimode Transponder for Satcom Applications

L3Harris Technologies, a trusted disruptor for the global aerospace and defense industry, delivering solutions connecting the space, air, land, sea, and cyber domains has introduced a new  S-band Multimode Transponder for satellite communication applications.

The C/TT-520 from L3Harris is an S-Band multimode transponder that provides full-duplex communications with a variety of NASA networks and protocols. It leverages the latest available technologies, traditionally tested and screened in accordance with EEE Level 2 parts program methods. 

The C/TT-520 is ideally suited to the harsh realities of space communications. It features receive data rates from 125 bps to 3 Mbps and transmit rates up to 6 Mbps. It maximizes throughput while maintaining a noise figure of 2.5 dB and implementation loss of 1.5 dB – assuring robust link closure under even the most marginal of conditions.  

The C/TT-520 provides accurate ranging using both Tracking and Data Relay Satellite System (TDRSS) long code pseudo-random noise (PN) ranging and Doppler turnaround ranging. PN ranging meets the stringent requirements of the TDRSS Space Network.

Compatible systems include the TDRSS, Space Network, the NASA Ground Network, the NASA Deep Space Network, and the Universal Space Network. The C/TT-520 also supports the Common Communications for Visiting Vehicles protocol used on the International Space Station and is a flexible hardware and firmware solution adaptable to a variety of missions and applications.

The C/TT-520 is configurable to suit mission and spacecraft buses. Selectable parameters include RF frequency, 1 of 85 gold codes, receive and transmit data rates, receive and transmit modulations, RF output power, encryption/decryption, convolutional encoding, Viterbi decoding, and Reed Solomon encoding/decoding. Available interfacing includes RS-422, low-voltage differential signaling, universal asynchronous receiver transmitter, and SPI.

Click here to learn more about the C/TT-520 S-Band Multimode Transponder.

Click here to learn about Satellite Transponders from various manufacturers listed on SATNow.

Publisher: SatNow

GNSS Constellations - A list of all GNSS satellites by constellations


Satellite NameOrbit Date
BeiDou-3 G4Geostationary Orbit (GEO)17 May, 2023
BeiDou-3 G2Geostationary Orbit (GEO)09 Mar, 2020
Compass-IGSO7Inclined Geosynchronous Orbit (IGSO)09 Feb, 2020
BeiDou-3 M19Medium Earth Orbit (MEO)16 Dec, 2019
BeiDou-3 M20Medium Earth Orbit (MEO)16 Dec, 2019
BeiDou-3 M21Medium Earth Orbit (MEO)23 Nov, 2019
BeiDou-3 M22Medium Earth Orbit (MEO)23 Nov, 2019
BeiDou-3 I3Inclined Geosynchronous Orbit (IGSO)04 Nov, 2019
BeiDou-3 M23Medium Earth Orbit (MEO)22 Sep, 2019
BeiDou-3 M24Medium Earth Orbit (MEO)22 Sep, 2019


Satellite NameOrbit Date
GSAT0223MEO - Near-Circular05 Dec, 2021
GSAT0224MEO - Near-Circular05 Dec, 2021
GSAT0219MEO - Near-Circular25 Jul, 2018
GSAT0220MEO - Near-Circular25 Jul, 2018
GSAT0221MEO - Near-Circular25 Jul, 2018
GSAT0222MEO - Near-Circular25 Jul, 2018
GSAT0215MEO - Near-Circular12 Dec, 2017
GSAT0216MEO - Near-Circular12 Dec, 2017
GSAT0217MEO - Near-Circular12 Dec, 2017
GSAT0218MEO - Near-Circular12 Dec, 2017


Satellite NameOrbit Date
Kosmos 2569--07 Aug, 2023
Kosmos 2564--28 Nov, 2022
Kosmos 2559--10 Oct, 2022
Kosmos 2557--07 Jul, 2022
Kosmos 2547--25 Oct, 2020
Kosmos 2545--16 Mar, 2020
Kosmos 2544--11 Dec, 2019
Kosmos 2534--27 May, 2019
Kosmos 2529--03 Nov, 2018
Kosmos 2527--16 Jun, 2018


Satellite NameOrbit Date
Navstar 82Medium Earth Orbit19 Jan, 2023
Navstar 81Medium Earth Orbit17 Jun, 2021
Navstar 78Medium Earth Orbit22 Aug, 2019
Navstar 77Medium Earth Orbit23 Dec, 2018
Navstar 76Medium Earth Orbit05 Feb, 2016
Navstar 75Medium Earth Orbit31 Oct, 2015
Navstar 74Medium Earth Orbit15 Jul, 2015
Navstar 73Medium Earth Orbit25 Mar, 2015
Navstar 72Medium Earth Orbit29 Oct, 2014
Navstar 71Medium Earth Orbit02 Aug, 2014


Satellite NameOrbit Date
NVS-01Geostationary Orbit (GEO)29 May, 2023
IRNSS-1IInclined Geosynchronous Orbit (IGSO)12 Apr, 2018
IRNSS-1HSub Geosynchronous Transfer Orbit (Sub-GTO)31 Aug, 2017
IRNSS-1GGeostationary Orbit (GEO)28 Apr, 2016
IRNSS-1FGeostationary Orbit (GEO)10 Mar, 2016
IRNSS-1EGeosynchronous Orbit (IGSO)20 Jan, 2016
IRNSS-1DInclined Geosynchronous Orbit (IGSO)28 Mar, 2015
IRNSS-1CGeostationary Orbit (GEO)16 Oct, 2014
IRNSS-1BInclined Geosynchronous Orbit (IGSO)04 Apr, 2014
IRNSS-1AInclined Geosynchronous Orbit (IGSO)01 Jul, 2013