> homemade one. I discovered that your cable actually had the DIN 1200 > "data out" pin connected to pin 9 (spkr) on the FC-301 DB-9 connector > rather than the expected pin 2 (Data out). I used a standard DIN packet
That's as designed. The radio's data out goes to the 'DISCR' or 9600 baud output pin, and the speaker output goes to the 'RXA' or 1200 baud output pin. This was done to match existing ham rigs as much as possible. > characteristics as my own cable. I suspected that the speaker output was > not high enough to drive the OT2m and as I was in a rush I was not able > to program the FC-301 output level properly. The speaker output should be way higher than the data output. > 2. It would also appear that the so called "Data out" signal of the > FC-301 is unsquelched. Therefore it is not strictly comparable to other > radios which have the data out squelched. One needs to make sure the > squelch control signal gets into the OT2m and that the "external > squelch" box is ticked. Is that correct? The TM-271A and DR-135T I've got here both have unsquelched data outputs. In fact, I've never seen one with the '9600' output squelched. Scott
