I learned two ways to do this. One is to simply unplug both plugs to take the DSP out of line for AM use. Then plug it back in for SSB use. The second approach would be to install a switch. I decided on the switch. You'll do this by switching the "small red wire" on the bottom plug. But you must remember, in order for this to work, always switch it when the radio is OFF! This is because of how the digital circuitry works. If you switch it while the radio is on, the gate array in the DSP will not obey "the new data command stream" and then simply disregards it. You see, the gate array recieves its operating commands upon radio start up. If the DSP is pluged in, the radio cpu "sees" this. And then sends the proper data stream to the DSP to turn on. So, if you leave it pluged in but switch the red wire off WHILE the radio is still on, the DSP will still be on. by switching off the red wire first and THEN turn the radio on, the radio cpu never sees the DSP in the first place and simply directs all the mic audio to the balanced modulator. Cool huh? BTW, this radio performs VERY well in AM mode when you bypass the first mic preamp circuit. I bring in my rack audio via balanced XLR line to a balanced to unbalanced impedance transformer which sits inside the radio. This transformer then feeds the balanced modulator through a capacitor and resistor. You will also need to turn your filters OFF on transmit for full fidelity audio. To do this, while radio is off, hold both 8.83 + RIT buttons, then turn radio on. Both 8.83 MHz and 455 kHz IF Filters are now selectable on transmit. Each memory channel is also capable of storing this setting. Also, you'll need to open up the radio and remove one the 455 khz filters and put a jumper across it. Then plug it back in. I chose to jump the cw filter. So on AM mode, simply select this cw filter. This will open up the TX audio bandwidth big time. Using SSB with the DSP does not use these filters. Now the only area that will govern the transmit audio bandwidth is the 8.83 mhz filter section. This is why you will select "none" on the 8.83 filter button. Then what does it use? It sends everything through the FM 12 khz coil and capacitor filter! This is way cool. Im telling you, these are one of the best rice boxes out there for AM! I feel sorry for the TS-950SDX guys out there. But hey, they still bring a good dollar on Ebay though!
Joe Townsley
