he CX-AUTO was designed to satisfy the many requests from AT-AUTO owners for additional coaxial outputs. It does that quite well and more! The CX-AUTO is a QRO-capable RF coaxial antenna switch that integrates seamlessly and automatically with the AT-AUTO and expands the AT-AUTO’s singular coaxial output to 8 coaxial outputs.
The CX-AUTO operates from 160-6M and will conservatively handle 1500 W CW key-down. Competitors offer multi-port, remotely controlled antenna switches but none of them are capable of automatic integration with the AT-AUTO. Once the CX-AUTO is connected to the AT-AUTO, the user’s choice of any one-of-eight coaxial outputs may be automatically selected whenever the user changes bands – all done autonomously – without need for operator intervention.
The AT-AUTO / CX-AUTO combination provides the user with a fully-autonomous antenna selection capability regardless of the make/model of radio used with the AT-AUTO (requires AT-AUTO firmware version 2.13 or later). Automatic antenna selection works with Icom radios by utilizing the radio’s CI-V frequency data, and with non CI-V capable radios by counting the transmitted RF frequency.
With AT-AUTO firmware version 2.14 and later, the CX-AUTO may also be used to switch between multiple radios — permitting the AT-AUTO to work with up to 8 different radios, selected via the AT-AUTO’s front panel controls. Using two CX-AUTOs, one for radio selection and one for antenna selection, provides a true 8×8 matrix capability — any 1-of-8 radios operating into any 1-of-8 antennas, all utilizing the same AT-AUTO. Convenient & cost effective!
Not limited to just the AT-AUTO, although the CX-AUTO was originally intended as a companion product to the AT-AUTO to automatically select from one-of-eight antennas, the CX-AUTO’s firmware and flexible switching scheme enable it to simultaneously select multiple output combinations as would be needed to switch antenna arrays or antenna phasing networks – all without needing to change jumpers or wire settings. Merely by sending it simple serial data commands, you may select any of the possible 256 combinations of the eight coaxial outputs. As an added advantage, un-selected coaxial outputs are shunted to ground.
The CX-AUTO uses the simple but effective and robust CI-V protocol implemented by Icom and is fully compatible with any device using the CI-V system & protocol. For rigorous deployments, the CX-AUTO may also be controlled via its RS-422 port for distances up to 3600′ from the shack and uses standard networking CAT5 cables and connectors. Nothing to disassemble or solder, and nothing complicated, proprietary, or expensive.
The CX-AUTO employs user-selectable addresses permitting multiple CX-AUTOs to be deployed on the same CI-V/RS-422 bus, eliminating extra control cable runs – something else that the competition can’t do.
The CX-AUTO is normally powered via the front panel from the 12 volt “wall-wart” provided or from any convenient 10-15 volt power supply. However, for convenience and flexibility, the CX-AUTO may also be configured to receive DC power via the RF coaxial cable.
The CX-AUTO offers the following features:
- Strong RF shielded enclosure
- .090″ aluminum, anodized and powder-coated chassis and cover/mounting bracket
- Low loss (< 0.1dB) and excellent isolation (>60 dB)
- Un-selected ports are shorted to ground
- Low power operation (10-15VDC, 30mA, no output selected, 120mA w/one output selected)
- Uses common, readily available, non-proprietary cables and connectors.
Any one of 256 output combinations are possible.
Mount the CX-AUTO in a convenient location, sheltered from rain, snow, or other precipitation. Use the four mounting holes incorporated into the mounting plate/chassis cover.
Supply 12 VDC power via the front-panel receptacle or supply DC power via the “common” coaxial cable.
Connect either a CI-V or RS-422 (CAT5) cable and set the CI-V/RS-422 front-panel switch as appropriate. Note: Multiple CX-AUTOs may be daisy-chained on the same data bus so long as each CX-AUTO is configured for the same data rate, but with unique addresses. Then interconnect via CI-V/RS-422 patch cables.
Configure the serial address and data rate via the front-panel switches. Connect the other end of the CI-V or RS-422 cable to the AT-AUTO or to the PC (via suitable CI-V/RS-422 to RS-232/USB converter as appropriate).
The CX-AUTO employs an embedded microprocessor which receives serial data commands via an Icom style CI-V bus or via an RS-422 interface and then controls 16 relays for selection of any of the 8 coaxial outputs. The serial control data is consistent with the Icom CI-V protocol and the CX-AUTO is capable of selecting any of the possible 256 combinations of the 8 coaxial outputs.
To improve isolation and performance, each coaxial output has a dedicated pair of relays to perform the RF switching. The CX-AUTO configuration yields excellent port-to-port isolation, low loss, and excellent SWR performance over singular-relay antenna switches.
The front-panel includes LED indication for each coaxial output to identify the selected output(s).
- Power Rating: > 2kW CW key-down (SWR < 3:1)
- Serial data control line: 5V Open-Collector twisted pair or RG-174 shielded for runs up to approximately 50 feet. CAT5 twisted-pair differential for runs up to 3600 feet.
- Dimensions: 8.25″ wide, 10″ deep (11.75″ overall with mounting plate), 2.5″ height
- Two-piece hardware construction with mounting holes incorporated into chassis cover plate
This is an unboxing and first look at the Wouxun KG-UV9D Plus dual band Limited Edition radio available Read more
“Congratulations! You just earned your FCC Technician amateur radio license. I bet when you took the test, one of the examiners asked if you wis... Read more
Direct Sampling Brought to the VHF/UHF World Icom strives to be first, to be innovative, and to continue to refine our radios for a balance of cutting... Read more
Mix and match any four HF/VHF/UHF bands. Example: screw in 80,40,20 meter hamsticks and a dual band 2M/440 MHz whip (two on each band) on opposite sid... Read more
In the midst of packing for my DXpedition / SCUBA dive trip to San Salvador Island, I felt the need to start a series on designing and building a port... Read more