Many, many thanks to all of you that took the time to reply to my inquiry. Many of you wrote very detailed replies. In general, the advice tended to indicate that VFO's are out, for anything but stra
At 11:56 13/08/2002 -0700, you wrote: Perhaps someone who has already 'been there' can offer their advice. I would like to start building the exciter stages for what will be my 136KHz tx (hopefully w
Hello Tom and Steve, Some years ago I built a 3.5MHz QRP TX using a 3.58MHz ceramic resonator. After some experimenting with the caps (to compensate the temperature drift of the ceramic resonator and
In a message dated 8/13/02 7:54:19 PM GMT Daylight Time, [email protected] writes: Perhaps someone who has already 'been there' can offer their advice. I would like to start building the exciter st
Steve Buy one of the ceramic (as opposed to quartz) resonators in the 2.5 MHz region and use in a VXO circuit. About 100pF variable gives me band coverage. Divide by 18 for 136 output, any drift is a
Hi Steve, If you want to go for a VFO design I wouldn't use 2 VFO's and mix down but a single VFO and divide down. In my early days on 136kHz I used a 8.7MHz VFO and divided it by 64. Using a simple
Dear Steve, I myself have not bothered too much about the stability of my crystal mixer vfo because I am using it for normal CW only. But DJ2EY recently reported to me that he had also built my built
<< I am worried about drift but also thinking that they may be stable enough if kept in the 1 - 2MHz region. As well, they should (if identical) drift by the same amount and thus be self-correcting?
Perhaps someone who has already 'been there' can offer their advice. I would like to start building the exciter stages for what will be my 136KHz tx (hopefully we will have access to the band within
