As mentioned in previous posts, I can supply all of the printed circuit boards for this project. You can order them on the order form. The HMI, Display, and Auxiliary boards are fully assembled and tested. You will need to purchase the Teensy 4.1, Teensy Audio Adapter (Rev D), and the ESP8266-01 board separately to complete the HMI board. All other boards are provided with SMT devices pre-installed. You will need to purchase the through-hole components listed on the bill-of-material spreadsheet to complete these boards.

CTR2 has evolved into a rather large project. A fully built-out system contains 24 individual boards (not including the Teensy and ESP boards). While this sounds terribly complex and expensive, the design of the system allows you to start with a very basic system and expand it as your needs change. Most hams will find a small system capable of controlling up to four radios and a couple of antennas to be more than sufficient for their needs.

I’ve listed the boards you might need below. The first cost column is the cost of the individual boards. All boards come with brass standoffs and Dupont jumpers as needed. The second cost column is the estimated cost to complete the board (including the board cost and all builder supplied components as listed on the BOM), based on component costs as of July 2021. A $15.50 USPS flat rate shipping charge will be added to each order. At the current time I’m only shipping to North America. International shipping will be added in the future.

NOTE: You can purchase the ESP8266 WiFi module from various vendors. I’ve found that it’s generally hard to tell which version of firmware they have loaded on them until you connect them to a terminal program and quarry them. The last ones I bought had v1.2 AT firmware. CTR2 was developed and expects v1.74 AT firmware so if you get a board with older firmware you’ll need a programmer to upload the v1.74 firmware. To make it easier for you, I can supply pre-programmed and tested ESP8266 boards for $5.00 each. They’re on the order form.

BOARD BOARD
COST
TOTAL ESTIMATED
COST TO COMPLETE
HMI – fully assembled and tested. To complete this board
you must purchase a Teensy 4.1, Teensy Audio Adapter Rev D,
and ESP-8266. Total Estimated Cost includes these boards.
$55.00 $105.00
DISPLAY – fully assembled and tested. To complete the display
you must purchase either a Nextion 3.5″ or 5″ Enhanced display,
a rotary encoder, and a 1/4″ knob. Total estimated cost shown
includes all parts and the acrylic wedge enclosure kit.
$9.00 $59.00 (3.5″)
$104.00 (5″)
AUXILIARY w/Option 1 – fully assembled and tested. This board
includes the Radio I/O circuit to interface to a single radio. This
option does not required additional Radio I/O modules.
$30.00 No additional costs
AUXILIARY w/Option 2 – fully assembled and tested. Requires a
manual RJ45 switch to select two or more radios and one
Radio I/O module for each radio you want to control.
$8.00 No additional costs
RADIO I/O – the completed board requires the Radio I/O PCB
and the additional components listed in the BOM. I can supply
PacTec enclosures with CNC cut end caps. One Radio I/O module
is required per radio.
$3.50$31.70 w/enclosure
$26.00 w/o enclosure
ESP8266 WIFI Module – pre-programmed and tested with
v1.74 AT firmware
$5.00No additional costs

The following boards are supplied as PCBs with only the SMT devices pre-installed. The builder needs to install the additional through-hole components listed on the bill-of-material for each board. Through-hole components consist of relays and connectors.

PCB
COST
TOTAL ESTIMATED
COST TO COMPLETE
RJ45 SWITCH MASTER – the completed master board requires a
populated RJ45 Switch PCB (with SMT logic) and the additional
components listed in the BOM. One master board is required and
it manages the first 4 Radio I/O module connections.
$8.00$39.00
RJ45 SWITCH EXPANSION – the completed expansion board
requires an unpopulated (no SMT logic) RJ45 Switch PCB and
additional components listed in the BOM. One expansion board
is required for each group of 4 Radio I/O modules. Up to 3
expansion boards can be installed in the system.
$6.00$35.25
RADIO ANTENNA SWITCH CONTROLLER – the completed
board requires the RASC PCB and additional components
listed in the BOM. This board requires one or more electrically
operated remote antenna switches for operation.
$8.00$45.00
ANTENNA SWITCH CONTROLLER – the completed ASC
board requires the ASC PCB and additional components
listed in the BOM. This board requires an electrically operated
remote antenna switch for operation.
$8.00$29.00

Here are a few board packages to give you an idea of what to order and how much each board package will cost. In addition to these costs you’ll need to order the Teensy development boards, Nextion display, ESP8266-01 board, and other components required to complete the system. Links to Mouser are provided in the BOMs. You can always post questions below if you’re not sure of what you need.

PackageCapabilitiesCTR2 Boards Required
Basic #1Controls one radio. No radio or antenna switchingHMI $55.00
Display Driver $9.00
Auxiliary w/Opt 1 $30.00
Display Enclosure (3.5″) $15.00
Basic #2Controls up to four radios using a builder supplied manual
RJ45 switch – no antenna switching
HMI $55.00
Display Driver $9.00
Auxiliary w/Opt 2 $8.00
Radio I/O (x4) $14.00
Advanced #1Automatically controls up to four radios using the
CTR2 RJ45 Switch – no antenna switching
HMI $55.00
Display Driver $9.00
RJ45 Switch Master $8.00
Radio I/O (x4) $14.00
Advanced #2Automatically controls up to eight radios using the
CTR2 RJ45 Switch with one expansion board. No
Antenna switching
HMI $55.00
Display Driver $9.00
RJ45 Switch Master $8.00
RJ45 Switch Expansion $6.00
Radio I/O (x8) $28.00
Pro#1Automatically controls up to four radios using the
CTR2 RJ45 Switch. Antenna routing to all radios
and antenna selection supported. Requires two
electrically operated
4-port remote antenna switches.
HMI $82.00
Display $15.00
RJ45 Switch Master $8.00
Radio I/O (x4) $14.00
Radio Ant Switch Ctlr $8.00
Ant Switch Ctrl $8.00
Pro #2Automatically controls up to 8 radios using the
CTR2 RJ45 Switch and one expansion board.
Antenna routing to all radios and antenna
selection supported. Requires two electrically
operated 8-port remote antenna switches.
HMI $55.00
Display Driver $9.00
RJ45 Switch Master $8.00
RJ45 Switch Expansion $6.00
Radio I/O (x8) $28.00
Radio Ant Switch Ctlr $8.00
Ant Switch Ctrl $8.00
Pro MaxFull build out – automatically controls up to 16
radios using the RJ45 Switch and three expansion
boards. Antenna routing to all radios and
antenna selection supported. Requires three
electrically operated 8-port remote antenna switches.
HMI $55.00
Display Driver $9.00
RJ45 Switch Master $8.00
RJ45 Switch Expansion
(x3) $18.00
Radio I/O (x16) $56.00
Radio Ant Switch Ctlr $8.00
Ant Switch Ctrl $8.00

To order boards and enclosures, first determine the boards you need by reviewing the charts on this page then visit the Ordering Enclosures post to view the available enclosure options. Once you have your list, go to the Order Form.

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