I am using a similar interface with two transformer and an optocoupler. I DO RECOMMEND an optocoupler for avoiding problems with high induced EMF's due to thunder EMP. It is important down here.
The solution for those old rigs is to use an external "digital" VFO, say a PLL or a DDS, I would favor the DDS. There are kits for 5-6 MHz that fit the Kenwoods. I saw another one for the Collins S Line built by AOR. You just need to google for available solutions and prices, and see what is best if buying a better VFO or buying a whole new rig. I still like those old Kenwoods, but they were built more than a quarter of a century ago. The original VFO drift rate can be way too high for the rules of the "ballgame"we are playing nowadays. I suffered that with a Swan 700 and HF packet. 73, Jose, CO2JA Barry Michels escribió: > I have a TS-520 (no S or SE) that I use with a homebrew interface. The > interface is a simple audio transformer for TX audio and a 1 transistor > serial port PTT switch. RX audio goes straight into the Line-In with no > isolation. Linux is my OS of choice, so I use fldigi most of the time > (in Windows and Linux). WSJT7 for the weak signal modes. I've made > over 500 contacts using Winmor on this rig. Drift is bad and > calibrating the dial isn't accurate enough to run Winmor without > constant tweaking, so I have to listen first and center someone else's > signal before replying. Tried the WSPRnet on it once. It had drifted > 200hz by the next morning. > > Recently I built a Softrock RXTX v6.3 SDR and have been using the TS-520 > only as a signal generator (low power into a dummy load) to align the > SDR to improve image rejection. > > > Barry - KE4JUC > > Music Maker wrote: > >> . >> . >> Hello Happy Hams >> >> After returning to Amateur Radio after a very long absence, I am >> 'messing about' with digital modes - all of which are totally new to >> me, and at almost 75 years of age, my one very slow remaining braincell. >> >> I have downloaded and appraised all the programs I could find mainly >> for PSK 31, that will work with my little M0AQC (Alan) Interface. >> >> All seem to have their own individual merits and de-merits. >> MutltiPSK for example for its many supported modes - DigiPan or MixW >> for their simplicity. But for facilities, information, sheer >> complexity (for me!)Ham Radio DeLuxe. Sadly, it doesn't seem to >> integrate well with my aged but well loved Kenwood TS 520 SE !! >> >> However, the program that appeals to me the most at the moment (this >> may change as my experience and knowledge improves), is certainly >> Airlink Express - I rarely see any stations using this, and the >> numerical favou rite on air seems to be MixW. >> >> There obviously can't be a program that is 'One size fits all' - but >> for me, not one of them has all the elements I want, without loads of >> features I don't !! >> >> I would be very interested to hear what programs others use - >> particularly with 'Boat Anchor' Kenwood Transceivers (520, 530, 820, 830) >> >> For reference - and to save hunting around for Digi Software - I think >> most of it is available for download at this site - >> >> http://www.xs4all.nl/~nl9222/digisoft.htm >> <http://www.xs4all.nl/%7Enl9222/digisoft.htm%20> >> >> I am at present writing up my experiences in detail on my 'Amateur >> Radio Blog' on the Web Page at :- >> >> www.John4Music.TV <http://%20%20www.John4Music.TV%20> >> >> Kind regards and 73's to all from this white, windy and cold country >> called 'England'. 'Gl obal Warming' - I think not !!! HI >> >> de >> >> John G3OBU >> Participe en Universidad 2010, del 8 al 12 de febrero de 2010 La Habana, Cuba http://www.universidad2010.cu --------------------------------------------------------------------- SEGUNDO SEMINARIO INTERNACIONAL LEGADO Y DIVERSIDAD. ARQUITECTURA Y URBANISMO. El rescate de los valores urbanos y arquitectónicos en tiempos de globalización Colegio de San Gerónimo, La Habana Vieja, noviembre 24-27, 2009 ---------------------------------------------------------------------
