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Ten-Tec 1254 Receiver Processor Upgrade Installation
Overview
The upgrade kit adds to a Ten-Tec 1254 shortwave radio receiver finer step frequency tuning,
more memory channels, new radio features, and removal of the need for a backup battery. It
does this by replacing the radio's PIC processor with new firmware in a new Cypress processor
mounted on a daughter board to fit the radio's existing processor socket. An auxiliary circuit
board, cables, and new aluminum rear panel add a line level audio output, and a computer CAT
computer control interface. This computer interface is configured as either an RS-232 or mini-
USB connection.
The upgrade kit does not change the radio as supplied by Ten-Tec in it's construction or
alignment procedures. The alignment can be done with either processor.
• Precision laser cut aluminum rear panel with mounted auxiliary interface board, 3.5mm line
level output jack, computer communications connector with transmit and receive status LEDs,
and AGC level input connector.
• Cypress processor mounted on a daughter board with components for analog and digital
interfaces.
• Shielded analog audio input coax to connect the processor board to the radio's main board.
• Optional Ten-Tec 1254 display board mounted single auxiliary LED.
• Ribbon cable to connect the processor board to the auxiliary interface board.
• AGC tie in wire and connector from the radio's main board to the auxiliary board.
1 The additional LED supplied in the kit that can be installed in an existing, but unused location on the
display board.
1254 Upgrade Kit Contents
1
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Table of Contents
Related Manuals for Ten-Tec 1254
Summary of Contents for Ten-Tec 1254
- Page 1 Ten-Tec 1254 Receiver Processor Upgrade Installation Overview The upgrade kit adds to a Ten-Tec 1254 shortwave radio receiver finer step frequency tuning, more memory channels, new radio features, and removal of the need for a backup battery. It does this by replacing the radio's PIC processor with new firmware in a new Cypress processor mounted on a daughter board to fit the radio's existing processor socket.
- Page 2 The section of the daughter board that holds the JP1 flex cable connector must be pointed to the back of the radio. Do not install or if installed remove the 9 Volt battery for the original PIC processor supplied from Ten-Tec. It is not required.
- Page 3 AGC Pickup Connection The AGC voltage level from the radio's main board is used to determine the signal strength which is read over the computer control interface. Take the yellow wire with the two pin JST connector and plug it into the auxiliary board's two pin receptacle.
- Page 4 Note that it is not required to install this extra LED for the kit's operation. Refer to the Ten-Tec instruction manual page 1245 - Assembly - 7. The new LED inserts in between diode D5 and D6 in the same orientation in the holes present but unlabeled on the display board.
- Page 5 Pressing the V/M key sets the display refresh rate between fast “c1” and slow “c0”. The default setting is fast. Pressing V/M again returns to normal operation. Slow should only be used when using a good regulated power supply. Fast is used for minimal radio noise using the Ten-Tec supplied wall supply.
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