[WriteLog] TS440 interfacing

[Gorecki, Steve (Sudbury)]

Phil, if I remember from my earlier days of Packet with my TS440 (early
model), indeed the mic input is too sensitive for a lot of modulation (a
KAM), especially from a sound card. Look at the 13 pin connector pinouts and
you will see places to hook up audio input, as in the case of packet. This
allows you to adjust the input audio (with external pot, or use "Line Out"
on sound card if you have it) without affecting the mic gain on the front
panel. However, the mic is still ON whenever you input PTT via the 13 pin
connector! This adds noise, etc to you modulated signal if the mic gain is
turned up, sometimes bad enough to prevent my packet from connecting. I
installed a small signal diode in the same connector to a mike mute pin,
again somewhere in the 13 pin connector from the PTT. This way when I keyed
the TX with the PTT, I would also ground the mike mute to silence the
microphone input. It worked for me.

I'm sorry I can't give more detail as I sold off the TS440 a while back.
After a few years, it's hard to remember. Look carefully at the pin-outs and
the schematic and give it a try with the 13 pin connector in the back, it's
much cleaner that way and lets you quickly switch back and forth between
digital modes and SSB.

Steve
VE3CWJ
VE3CWJ@rac.ca



>Date: Mon, 5 Jun 2000 21:57:20 EDT
>From: PTSMANTUA@aol.com
>Subject: [WriteLog] SoundBoard Help Needed - or a re-direct to an archive
>
>Hi,
>
>    Trying to get another part of Writelog working to enjoy it more, but
have 
>goten stuck. If there is an archive by month or title I should search for 
>Please let me know where to look, and I'll happily do some more research.
If 
>not, would appreciate some help to get over the last hurdle.
>
>    The rig is a KW TS-440S, with a Dell Laptop. Have been running PSK31 
>using cables connected to speaker out for recieve and AFSK in for transmit.

>This worksOK, but the mic is hot during PSK,(very undesirable) and must be 
>attached, else no signal out. Using standard radioshack isolation xfrmrs 
>there.
>
>    Questions are;
>
>    Is there a better/safer way to hook up PSK to a TS440S, without going 
>through the mic input with a divider circuit to prevent overdriving the
mic?
>
>    Has anyone worked out a minimal cabling set-up that would allow 
>soundboard RTTY, Voice, and PSK using a TS 440S?
>
>    Trying to avoid multiple cables for multiple modes, if I can?
>
>    Second Topic I think is more a Windows/perhaps Writelog Config issue.
>
>    Testing into a dummy load, If I play a ssb recorded message <msg2.wav>
by 
>pressing the F2 key, The rig keys,and plays the message (based on power
into 
>the load, and by altering the message recorded with shift F2, it is clear
the 
>message changes).  I have no audio from the wav file when it plays on the
pc 
>speaker so I can't"hear" what is sent. I do have normal recieve as soon as
it 
>is complete playing. I also have no output mic -> soundcard -> speaker out 
>for any hope of Vox control at the rig. If I speak into the mic, while the 
>msg2.wav is playing, it  does transmit through by adding the 2 signals and 
>transmits both into the dummy load.
>
>    Obviously I can't proceed, so I am asking for help to get it all right.
>
>Awaiting replies and thanks in advance
>
>Phil
>
>KF8JW
>


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