| Electronics > RF, Microwave, Ham Radio |
| Varactor is to a capacitor like {insert unobtanium component} is to an inductor. |
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| PA0PBZ:
--- Quote from: T3sl4co1l on January 15, 2016, 07:20:36 am ---Supposedly, the modulation range is quite narrow, a few percent at most. --- End quote --- And there is your problem if you want to use it for tuning purposes. Also it is nice if you want to 'shake the carrier around a bit" but I don't think it can be used to have a fixed offset. |
| cdev:
I'm kind of curious about Yaesu's pre-selectors, which use slug tuned, loosely coupled inductors (and a gain stage) I have nasty interference on HF, probably from some rusty item in my immediate proximity (a big fence, for example) or something like that, and its driving me batty. I live near some high powered broadcasting towers. |
| AF6LJ:
If the noise is actually coming from the fence (diode action) Nothing like this will help short of tearing down the fence. The Yaesu preselectors are good for strong adjacent channel signals that may be overloading your receiver. I would explore the possibility your receiver itself is being overloaded by the strong BC signals. It takes a lot of signal to cause a fence to rectify RF. A BC band reject filter in your receive path may solve the problem and would be a lot cheaper (and less sexy) than the Yaesu fpreselectors. |
| babysitter:
I once had a RFT Teltow 215C which suffered a lot being located less than 6 km from the Radio station in Heusweiler. After removal of a pair of diodes (clipping rx input voltage) it was not completely gone, but at least much better. A tuned notch filter, as i only had a single frequency to fight, helped even more. BR Hendi |
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