I wrote an article on my digital setup a few months back on eham.net. http://www.eham.net/articles/8616 . This setup incorporates my old PK-232MBX, a HAL ST-6000 Terminal Unit, and a sound card modem. This allows access to all digital modes with the notable exception of propriety modes of G-tor, Clover, and Pactor II/III which I think should be limited to commercial, non-amateur frequency's. Amateur radio "public" frequency's should be just that with open-source only digital modes so that anyone can use these modes without the need of propriety hardware or licenses. Please note that an expensive Terminal Unit like the HAL ST-6000 is not required for a performance boost of the PK-232 TNC. I hooked up an old and very cheap ($5) AEA CP-1 TU to a PK-232 for a friend with excellent results. Doing this results in a PK-232 with 170 Hz filtering on the received audio without the need of going into the TNC and changing out resistors and re-calibrating it and using direct FSK keying allows 170 Hz shifting on the transmit as well. Building the audio interface allows including your sound card setup as well so you have the best of all digital worlds, software and hardware modes. PK-232 TNC's have gotten rather cheap in the last few years. Typically you can but one for less money than a commercial made sound card interface, which astounds me! Here you have a self-contained computer, modems, and audio filters costing less than two simple passive audio and PTT circuits in a box! As for the frequency readout difference between stations running two different shifts of 170 and 200, you just must remember that the stations are splitting the slight difference so neither ones Mark frequency will be exactly the same. The Mark frequency of the 170 Hz station will be 15 Hz higher and the Space frequency will be 15 Hz lower than the 200 Hz station. When done this way 99% of the time this will work out fine for both stations.
--- Mark Miller <[EMAIL PROTECTED]> wrote: > At 07:00 PM 3/5/2005, you wrote: > >Do I understand this right that the sound card > programs > >don't care what the freq of the tones are, just as > long > >as the shift is right? > > Yes, that is correct. > > 73, > > Mark N5RFX > > > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ <a href="http://dxcluster.blogspot.com";><img src="http://feeds.feedburner.com/DigitalSpotter.gif"; height="67" width="200" style="border:0" alt="Digital Spotter"/></a> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
![http://feeds.feedburner.com/DigitalSpotter.gif"](http://feeds.feedburner.com/DigitalSpotter.gif"){kind=link}