GM Jim and Merry Christmas Yes I'm using a pair of TimeWave units between the K3 line output and the microKeyer II primarily for dual channel RTTY operation. Both of these units provide an adjustable dual channel passband which can be centered on the standard tone pair frequencies.
Specifically the Main Rx audio goes from the Tip on the K3 Line output to the Line input on a DSP-599ZX and then from the DSP-599ZX Line output to the audio cable labeled "line out" on the K3R cable going to the microKeyer II. I'm also running a cable from the DSP-599ZX speaker output to a small 2" mini speaker to be able to separately monitor the main channel audio. Then for the subRx audio, I take the signal from the Ring on the K3 Line output to the Audio Input on the DSP-59+ and from from the DSP-59+ Line Output to the Tip on the audio connector on the microKeyer II labeled Sub Rx. I had the TimeWave units and decided to hook them up this way to provide independent control of the two audio channels for dual RTTY operation. I'm using MMTTY within DX4Win for the main channel and I open a separate instance of MMTTY for the subreceiver audio. This setup works very well for RTTY DX'ng and has resulted in being able to spot stations very quickly and work the DX. 73, Doug VE3MV ----- Original Message ----- From: "Jim Harris" <jim.w...@yahoo.com> To: "Elecraft Email" <elecraft@mailman.qth.net> Sent: Saturday, December 24, 2011 5:08 PM Subject: [Elecraft] K3 RTTY Audio Thru External DSP Hi to the group and Merry Christmas Has anyone used an external DSP (noise reduction) between the output of the K3 and a computer sound card? What was your experience with it? Before telling me the K3 provides all the noise reduction needed, remember the NR is turned off in digital modes. I'm contemplating using a JPS NIR-12, Noise/Interference Reduction Unit. If anyone has any experience with this setup how did you hook it up? Which output from the K3 did you use; headphone, speaker or lineout? Which output from the DSP; headphone, speaker or lineout? Did you use or find necessary to use an isolation transformer between the K3 and the DSP and the computer sound card? My primary concern is to prevent ground loops. The NIR-12 schematic appears not to have any isolation on the outputs as does the K3 on the lineout. I would appreciate any meaningful comments. Take pride in the USA. 73 Jim, W0EM ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
