(Node Number 7148)
The WB4FAY-L node consists of an internet connected
computer, a 2 meter transceiver (on 147.280 MHz), a 70cm receiver for
control operator access, and an interface board which is used to
interconnect the computer and the two radios. The
interface was purchased as a kit from WB2REM. On June 21, 2002
the PIC in the interface was upgraded to WB4REM's version 2.0
chip. The primary reason for the upgrade was due to the addition
of a configurable time-out timer which had been added to the code in
the PIC. Pictures and further information on the interface are
The PC is connected to the internet via a DSL link and
is connected to the interface board with 3 cables (audio in and out,
and a serial cable to COM1 or COM2 for PTT control). The
software is the EchoLink software (http://www.synergenics.com).
New versions with more features are coming on a regular basis so watch
for increased functionality in the future.
The main radio is the 2 meter transceiver which is
used for communication on 147.280(+) with the W4TPA repeater in
Birmingham. There is no physical connection with the
repeater. All linking is done via RF on the main repeater
The auxiliary radio is the 70cm receiver. This
is used exclusively for remote shutdown of the node should a control
operator determine that it is necessary.
Pictures and information of the
interface used at WB4FAY-L
This is a picture of the interface board after
assembly but before it was mounted in a metal enclosure. Note
that the mini-phone plugs and the LED's have not been mounted on the
board because they will be mounted on the outside of the enclosure
instead of directly on the board.
The board was assembled easily in about an hour and
operated properly the first time power was applied.
This is the board after it has been mounted in the
enclosure and wired to all of the switches, LED indicators and the
external connectors. The board is mounted via the DB-9
connector. All of the interface connectors are on the
rear of the enclosure to keep the cabling neat.
Not visible in the photo is a 1:1 audio transformer
under the board that in the audio output to the transceiver
This is the front of the fully assembled
interface. The two LED's were lifted from the WB2REM board and
mounted here to indicate 'power' (red) and 'activity' (green).
Switches were added to control (right
- Push to talk disable
- Audio source (Main rcvr or microphone)
- Main Receiver Audio (to link or speaker)
- Aux Receiver Audio (to link or speaker)
- Audio output from computer (to link or speaker
- Program Mode (ON: open D4 LED, power to JP1)
Note that the switches are all mounted so
the up position is the normal operating position.
This photo is the rear of the enclosure where all the
connections are made for the iLink. Connections (left to
Main transceiver (note the use of a
5-pin female DIN connector). This connection is wired to
match that of a TAPR-2 TNC for easy of radio interface cabling.
Aux Receiver audio input. (2 conductor
Microphone (3 conductor phone jack)
Speakers (3 conductor phone jack)
Computer Audio In (3 conductor phone
Computer Audio Out (3 conductor phone
Program Voltage - 15-20 VDC (Coaxial
Main Power - 12 VDC (Coaxial
Serial interface to computer COM1 or