Thanks for the reply mel. The interface i built has two optos in it. It recieves very well. No acc1 socket. When i first connect it up between the radio and computer there is the clicking noise as if it is getting ready to send.the vox is on and it is well warmed up.the radio will go into transmit mode when i use the pk232 for rtty so i know that it will send.i have tried using hrd and digipan and when i transmit a macro there is nothing.i have set the radio up for that frequency on the drive and plate and i am putting out about 30 watts so thats not a problem.maybe im just not getting the correct soundcard mic level when trying to tx so and this maybe tbe problem trying to get a ballance between the radio and the computer so will have another go today.there is a remote 7 pin socket on the back of the radio could that not be wired up to as i have tried to find info on it but as usual nothingexept the pinouts for the socket.
Many thanks mel
A few questions:
. . . Does the interface you built have transformers? "Two optocouplers" sounds strange, to me -- I didn't know
. . . . . they worked for analog signals.
. . . What is the pinout for the 7-pin socket?
. . . Are you feeding audio from the soundcard "Line out" or "headphone" jack, through the interface, to the
. . . radio's "microphone in" socket?
My _guess_ is that the PK232 uses "FSK keying" when you run RTTY. That's a different method of modulation than what you need for PSK31. FSK changes a control voltage to switch the radio from MARK to SPACE frequency.