Re: [Elecraft] OT: Dry air static
8-9 years back I made a beverage system, it went over a marsh. One beverage was 800+' long & the other around 500', I had the proper lengths at the time. I ran PVC piping with a "T" at the top to run the wire through to keep deer from hitting it and to keep it off the Phragmites (swamp reeds) below. It was the worst antenna I have ever tried to listen on. The dry reeds below rustling in the wind caused so much static that the noise level from it was more than all but a handful of local signals. Took me weeks to install and fight through the jungle of reeds and I ended up taking them down after a couple weeks of frustration. I worked no DX with those Beverages. Sans static from the reeds, they would have been awesome. 73, Gary KA1J > Snow static as well during blizzards do wonders to light up a neon > bulb. I used to put one between my long-wire and ground, even wind > when it would get a good swing would do the same thing > > Fred > VE3FAL > > Sent from my iPhone > Fred VE3FAL/CIW649 > > > > On Oct 31, 2018, at 19:13, Rose wrote: > > > > 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 >> > >> 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 __ 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
Re: [Elecraft] OT: Dry air static
Snow static as well during blizzards do wonders to light up a neon bulb. I used to put one between my long-wire and ground, even wind when it would get a good swing would do the same thing Fred VE3FAL Sent from my iPhone Fred VE3FAL/CIW649 > On Oct 31, 2018, at 19:13, Rose wrote: > > 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 > >> 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 >>> >>> >>> >>> >>> -- >>> 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 flesn...@tbaytel.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 arch...@mail-archive.com
[Elecraft] OT: Dry air static
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 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 > >> > > > > > > > > > > -- > > 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
