PSK31-Tone From: "Bob Lewis" Subject: Re: [Elecraft] PSK31-tone > Can anyone of you give me please an instruction, how > I can listen to the tone and also receive the tone to > operate to the same time. What I did was to wire a 24K resistor from the junction of R35 and R36 (the AF out) on the RF Board to a spare pin on the mike connector (pin 6 in my case). I then placed a 620 ohm resistor between the spare pin and ground, forming a voltage divider. I can now get audio to drive the sound card from the mike connector but the speaker or headphones are still active to listen to the tones. I have the sound card level adjusted so that when I have a comfortable listening level in the headphones I have ample drive to the sound card. You may have to experiment with the value of the 24K resistor depending to compensate for differences in sound cards. If I don't want to listen to tones, I just plug in the headset and leave it set on the bench. If you don't want to modify the K2, you could always use a "Y" cable adapter in the external speaker jack, connecting an external speaker or 8 ohm headset to one output of the "Y" and the sound card to the other output. You may need some attenuation in the sound card line to keep from getting "blown away" with volume from the speaker or headset. ++++++++++++++++++++++++++ Date: Sat, 25 Nov 2000 13:44:32 -0500 From: "Bob Lewis" Subject: Re: [Elecraft] PSK31-tone By the way, my K2 works perfectly with the worlds simplest PSK31 interface - a 15 K resistor. The resistor is tied between pin 1 and pin 3 of the mike connector on the front panel board. Working with R14 (1K) on the SSB board, it forms a voltage divider to attenuate the sound card output. Mike goes to pin 1 as normal, sound card goes to pin 3 to get the extra attenuation. No transformers, no optical isolators, no hum, no RFI, and after the ALC modification the IMD measures -39 dB on IC761 and second lap top running DigiPan. The PTT circuit is a simple NPN transistor built into the 9-pin "D" connector shell. +++++++++++++++++++++++++++++++++ From: "Bob Lewis" Subject: Re: [Elecraft] PSK31-tone I guess I'm too old fashioned :-) I often like to switch in the narrow IF filters to get rid of the QRM and AGC pumping and tune the signal with the K2. That is much easier if you can hear the receive audio. +++++++++++++++++++++++++++++++++++++++++++++ Date: Sun, 26 Nov 2000 20:48:12 -0600 From: ny9h Subject: Re: [Elecraft] PSK31-tone sorry if this was mentioned before; if you wire as an icom, which i did , you have audio out on the (i think) center pin... it works with my icom boom headset; to silence the spkr, you plug something into the headphone jack ... it outta work for psk also bill ny9h ++++++++++++++++++++++++++++++++++++++++++++++++++++++