Really cool project! I think you've pretty much shown us how Doppler radar works in your demonstration. When I had my Hamtronics 2 to 10 meter transverter I used a cotton ball stuffed into the case next to the crystal. It seemed fairly stable. Putting the cover on helped the most and had roughly the same effect that you've had. I'm not sure if the cotton ball helped if a all, but the price was right. I'm curious how a small resistor stuffed in with the crystal and cotton ball would work. Or, probably wrap it with some of that goop they use to seal electrical connections outside or re-usable putty. I'm not sure how much is too much, but I would make it a value that doesn't get too hot to touch. I couldn't help but notice W4HLR's call sign on the screen. I laughed and thought Timtron? Probably not much AM activity on 10 GHZ, but why not. Thanks for sharing this project with us.
I am having fun with the 10G projects. I look forward to my first QSO! I had a Swan TV-2 transverter for a while. I built a temperature controller with a resistor and thermister epoxied to the crystal, controlled by an op amp. It worked pretty well. On 10G you have to put the transverter at the dish due to feedline losses, so it will be exposed to temperature extremes both hot and cold. It's pretty hard to control drift in that environment, although a temperature controller able to handle it could be built. I prefer to lock it to a GPSDO for the ultimate in stability. I will start work on that part of the project soon. I also want to get back to work on the beacon. So much to do!
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Really cool project! I think you've pretty much shown us how Doppler radar works in your demonstration. When I had my Hamtronics 2 to 10 meter transverter I used a cotton ball stuffed into the case next to the crystal. It seemed fairly stable. Putting the cover on helped the most and had roughly the same effect that you've had. I'm not sure if the cotton ball helped if a all, but the price was right. I'm curious how a small resistor stuffed in with the crystal and cotton ball would work. Or, probably wrap it with some of that goop they use to seal electrical connections outside or re-usable putty. I'm not sure how much is too much, but I would make it a value that doesn't get too hot to touch. I couldn't help but notice W4HLR's call sign on the screen. I laughed and thought Timtron? Probably not much AM activity on 10 GHZ, but why not. Thanks for sharing this project with us.
I am having fun with the 10G projects. I look forward to my first QSO! I had a Swan TV-2 transverter for a while. I built a temperature controller with a resistor and thermister epoxied to the crystal, controlled by an op amp. It worked pretty well. On 10G you have to put the transverter at the dish due to feedline losses, so it will be exposed to temperature extremes both hot and cold. It's pretty hard to control drift in that environment, although a temperature controller able to handle it could be built. I prefer to lock it to a GPSDO for the ultimate in stability. I will start work on that part of the project soon. I also want to get back to work on the beacon. So much to do!