HF/6m tranceiver that run on 12-16V using just above 1.5A for RX and 20A for full power TX.
General info here, here and here.
This is a 7-pin DIN plug used to connect to an external linear amplifier or transverter. It has an ALC input and a T/R-relay connection. The ALC input is biased down to -10V for minimum power output.
To connect to a computer the TS-680 needs the IF-10C module installed and IF-232C interface and level converter. They are out of production like the transceiver itself and hard to find. The latter also is a bit old fashioned nowadays when USB is the norm.
The interface cable can be made with a USB chip like the FT232RL. The connections from FT232RL to the 6-pin DIN is:
6-pin DIN (ACC1)
GND - Pin 1
RXD - Pin 2
TXD - Pin 3
RTS - Pin 4
CTS - Pin 5
Serial interface full duplex
Transfer rate: 4800 BPS
Sync: Asynchronous
Bit construction: 1 start bit, 8 character bits, 2 stop bits (NO parity)
Even easier it can be made by soldering a 6-pin DIN plug to a cheap off-the-shelf FTDI USB-Serial cable.
It is tricker to find or replace the IF-10C. There is a commercial IF-10C substitute from Piexx that also include the level converter and a ribbon cable meant to bypass the 6-pin DIN (ACC1) and connect directly to a serial port.
If you want to roll your own there is a schematic and PCB layout available. This Japanese ham built his own copy.
Connected via 13-pin DIN ACC2.
The optocoupler for PTT is connected in a non-inverting way to the RTS line of a USB serial port. Some friendly applications like fldigi lets you configure if you want the PTT to be a logical high or low. Some applications like WSPR and wsjtx don't and then the optocoupler might have to be connected so it inverts the RTS line.
Non-inverting Inverting
--------------------------------------------- +V
| | |
>-[==]-1[U]4-/ \-1[U]4-/
[ ] [ ]
/-2[_]3-[==]-> >-[==]-2[_]3-[==]->
|
--------------------------------------------- 0V
A very portable HF-UHF all mode QRP tranceiver. A real best seller for Yeasu.
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