Fred, I recall the output capacitor of the pi-net capacitor in my HT-17 rythmatically snapping in response to the charged particles of dust in the dry Oklahoma air building up on the long wire antenna. (;-)
73 ! K0PP kengk...@gmail.com On Wed, Oct 31, 2018, 16:42 Fred Jensen <k6...@foothill.net wrote: > Hmmm ... There seem to be different flavors of static. My reference was > to what is often called "precipitation static" [rain, snow, maybe hail] > and which can sometimes also be caused by wind blowing sand/dust past > the antenna. It sounds like bacon frying in the receiver. Each drop or > snowflake acquires a minuscule charge falling or blowing which > discharges into the antenna on contact. The typical semiconductor > devices in radio front ends these days exhibit a nearly infinite > impedance to "ground" and a tiny capacitance. The constant little > pulses from the static charge that capacitance with essentially no > discharge path. That's what fried the 1st 760 II and then, predictably, > the second one. > > There is also the combined "static" caused by distant thunderstorms. > > INT QRN: "Are you troubled by static" > QRN: "I am troubled by static" > > which is different than "static" caused by corona or leakage on a high > voltage power transmission line. > > 73, > > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > > PS: For those about to tell me "nearly infinite" is a meaningless term, > save the BW. I know, I hold a math degree. Just using a little > editorial license. > > On 10/31/2018 3:10 PM, ab2tc wrote: > > Hi, > > > > It's a dead short circuit for DC and low frequencies thanks to the SWR > > bridge (it has a voltage transformer directly across the antenna > terminals). > > There seems to be different opinions on what is meant by "static". To me > it > > means a slowly varying DC voltage caused by static buildup in the clouds > > during or before thunderstorms. The K3(S) is perfectly protected against > > these. Some people include the transients that are caused by actual > > lightning strikes nearby in the definition of "static". The K3(S) is not > > protected against these as they have very strong high frequency content. > For > > these extra protection is needed as discussed several places in this > thread. > > I have a number of Alpha-Delta switches in my antenna system and they > have > > gas discharge tubes, but frankly I have no idea how effective they are. > > > > AB2TC - Knut > > > > > > wayne burdick wrote > >>> On Oct 30, 2018, at 12:50 PM, Fred Jensen < > >> k6dgw@ > >> > wrote: > >>> Does my K3 have a static bleed across the antenna terminal(s)? > >> Yes. > >> > >> Wayne > >> N6KR > >> <snip> > > > > > > > > > > -- > > Sent from: http://elecraft.365791.n2.nabble.com/ > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to k6...@foothill.net > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to elecraftcov...@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
