--- Bill Swingle <[EMAIL PROTECTED]> wrote: > Wouldn't a Ham operating on your frequency "clobber" you regardless > of > whether you have a double conversion Rx? > Yes. But note that I said your *image* frequency. Say you have an SC receiver with a 455 khz if and you're tuned to 53,200 khz, and your local oscillator is operating at 52,745. Then your receiver will hear signals at 53,200 and at 52,290. The signals at 52,290 will not be received as strongly because of the selectivity of the receiver's first stage, but they'll still come through. If perchance there's a ham on that frequency, you could get clobbered.
Your local oscillator could also operate at 53,655, in which case the image frequence would be 54,110. This is out of the ham band, but commercial services may operate on that frequency. A double-conversion receiver eliminates this by having a much higher first if, so the images are so far away from the desired signal that the front end of the receiver easily rejects them. __________________________________________________ Do you Yahoo!? New DSL Internet Access from SBC & Yahoo! http://sbc.yahoo.com RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
