Bob,
Contact WA1FFL about his DDS VFO Kit. This was in QST back in 2001. http://www.fpqrp.com/BBITS/BB1002.PDF#search='wa1ffl' I built one here, and although not complete, it works very well. I opted for 2.5 to 12.5 Mhz tuning range, but you can select from several options such as 3.5 to 4.0 Mhz. With a simple 1 transistor amplifier (MR4134 T-Mos FET), I get 20 Volts P-P into a 220 ohm load. The output is a sine wave without any L-C filtering. With a cheap 50.0 Mhz crystal, my VFO is only 20 hertz off from the dial (plus offset) setting. One downside is the display reads from the low end, and not the actual frequency. You can save money and forget the display, and instead use a digital frequency counter. Another issue is that every time you power up, the frequency reverts to the bottom of the range. These are only minor annoyances offset by a clean and rock solid VFO. I'm still waiting on putting it all in a cabinet, and hooking it to my 20A. Regards, Jim WD5JKO --- Bob Maser <[EMAIL PROTECTED]> wrote: > After messing around with some "Ham" crystals and > getting low oscillator > output, I have decided to find a suitable VFO for > the 20V-3. Some time back > I saw a posting on this reflector for a modern VFO > that some ham was > selling. Does anyone have this info? What other > VFO's would work, like > Heath, Johnson, etc.? > > Thanks, > Bob Maser > W6TR > > ______________________________________________________________ > AMRadio mailing list > Home: > http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul > Courson/wa3vjb >
