Hi Wilson, What bands and frequencies?
Virtually all high-dynamic-range superhets have some birdies. These are usually caused by high-order mixer products interacting with the VFO, BFO, etc. We went to some lengths to minimize them, e.g. by using a balanced low-pass filter in the mixer's commutating path. But there will still be a few, typically on the highest bands (10 and 6 m). Some birdies can be substantially suppressed on a per-band basis using a built-in spur-avoidance tool in the CONFIG menu. See the "SIG RMV" menu entry description in the owner's manual. 73, Wayne N6KR > On Jul 1, 2022, at 11:23 AM, Wilson Lamb via Elecraft > <[email protected]> wrote: > > > I've meant for years to ask about the birdies I hear from my K3. > At many frequencies across HF, I hear obviously internally generated birdies. > They are very narrow and quite strong. > I've noticed recently that I can cause them to occur by setting the high and > low ends of the filter to overlap (zero or negative bandwidth), but there are > still come heard with normal settings. > I see this regularly, on two K3, so feel it must be something experts know > about? > Thanks, > WL > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
