K3 mobile
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I am considering operating my K2 in a mobile or portable
situation.
Can anyone recommend their best book or website where I
can get advice on all the emc funnies associated with mobile
installations?
73
David
G3UNA
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Here is a excellent site http://www.k0bg.com/
73 W4GNS
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David,
Alan, K0BG has an excellent site. He's considered an authority on HF mobile. If Alan hasn't changed things there's even several photos of my our RV's screwdriver set up. (:-) 73! Ken Kopp - K0PP [hidden email] _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by David Cutter
There are at least two ferrite core transformers in the K3 that are
supported only by their thin wires. I'm concerned that they may not survive a mobile environment. It would take only a dab of RTV (silicone adhesive sealant) to secure them, but I don't know if this has been discusses or approved. Windy KM5Q _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by David Cutter
I have seen the use of dope, sealers and so on strongly discouraged by Elecraft.
matt, W6NIA Oct 22, 2008 10:30:51 AM, [hidden email] wrote: There are at least two ferrite core transformers in the K3 that are _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I have seen it done in commercial products and I recently did it when I was assembling my SoftRock receivers because of my concerns with the #30 wire breaking. The two reasons I might think of would be any detuning effect or fear of the material used attacking the wire insulation. Any wisdom on this subject out there? I did not see or am not aware of the Elecraft advisory. 73, Bob K2TK [hidden email] wrote: I have seen the use of dope, sealers and so on strongly discouraged by Elecraft. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I put over 500,000 miles on a K2 in a rough mobile
environment (18 wheeler) I have a K3 now, since January of this year, and
spend about 90% of my time on the highways and 10% bouncing up and down
mountains going in and out of Windmill sites. I have yet to have the K2 or K3
have ANY problems what so ever. The radio's Will take the abuse, without any
user mods are fixes.
73 Gary W4GNS
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In reply to this post by Bob-270
Cheap RTVs such as used in bathroom sealant has a vinegar
smell and will attack copper. In a small confined space inside a radio
that's not good. In an open outdoor environment where the gas can escape
it's not such a problem. Dow Corning and others make RTVs with benign
contents, but at a considerable increase in cost.
Surface mount components have practically no exposed
copper and pcb tracks are not exposed, so, I wonder whether the acetic acid
attacks the tin coated contacts.
David
G3UNA
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David Cutter wrote:
>? Cheap RTVs such as used in bathroom sealant has a vinegar smell and >will attack copper. In a small confined space inside a radio that's >not good. In an open outdoor environment where the gas can escape it's >not such a problem. The problems about "confined space" are only relevant while the silicone is curing. Acetic acid is released during this process and normally it escapes easily into the air - hence the vinegar smell. After 24 hours, fully cured silicone rubber doesn't smell (or even taste :-) of anything. The situation to avoid is an almost completely enclosed volume such as a balun box. If the acid vapor has no means of escape, it remains trapped inside to cause corrosion. > Dow Corning and others make RTVs with benign contents, but at a >considerable increase in cost. > They also don't cure as fast as the acid-based material, and tend to have a much poorer shelf life. >Surface mount components have practically no exposed copper and pcb >tracks are not exposed, so, I wonder whether the acetic acid attacks >the tin coated contacts. > The main problem on a circuit board is the huge number of junctions between dissimilar metals. In the presence of free acetic acid, these will corrode badly. Coming back to the problem of securing toroids, one of the best materials is hot-melt glue. This is an excellent RF insulator (polypropylene) and works well in any location that doesn't get hot. A small blob would easily secure an edge-mounted toroid. I guess the only reason why Elecraft recommends against it is because there's always sure to be someone who thinks "more must be better". Polypropylene has a significant dielectric constant so it *will* increase stray capacitance in critical tuned circuits. -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by David Cutter
RTV is very often available as gasket maker/filler from your friendly
neighborhood auto parts store. Permatex #16B, Black, Silicone Adhesive Sealer IS NOT SUITABLE, CONTAINS ACETIC ACID PERMATEX #598B, Black, Hi-Temp RTV Silicone Gasket Maker IS SUITABLE and DOES _NOT_ CONTAIN ACETIC ACID 73, Tom Hammond N0SS At 00:30 10/23/2008, David Cutter wrote:  _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by David Cutter
Or if you have a hot glue gun you can use that too.
------------------------- 73, Greg - AB7R Whidbey Island WA NA-065 On Thu Oct 23 6:17 , Tom Hammond sent: > > >RTV is very often available as gasket maker/filler from your friendly > > >neighborhood auto parts store. > > >Permatex #16B, Black, Silicone Adhesive Sealer IS NOT SUITABLE, > >              >CONTAINS ACETIC ACID > > >PERMATEX #598B, Black, Hi-Temp RTV Silicone Gasket Maker IS SUITABLE and > > >               >DOES _NOT_ CONTAIN ACETIC ACID > > >73, > > >Tom Hammond  N0SS > > > > >At 00:30 10/23/2008, David Cutter wrote: > > > >Cheap RTVs such as used in bathroom sealant >has a vinegar smell and will attack copper. In a small confined >space inside a radio that's not good. In an open outdoor >environment where the gas can escape it's not such a problem. Dow >Corning and others make RTVs with benign contents, but at a considerable >increase in cost. > > > >Surface mount components have practically >no exposed copper and pcb tracks are not exposed, so, I wonder whether >the acetic acid attacks the tin coated contacts. > > > >David > >G3UNA > > > >----- Original Message ----- > > >From: Bob > > >To: [hidden email] > > > >Cc: >[hidden email] > > > >Sent: Wednesday, October 22, 2008 7:35 PM > > >Subject: Re: [Elecraft] K3 mobile > > > >OK... May I ask why? > > > >I have seen it done in commercial products and I recently did it when >I was assembling > > >my SoftRock receivers because of my concerns with the #30 wire >breaking. > > > >The two reasons I might think of would be any detuning effect or fear >of the material used > > >attacking the wire insulation. > > > >Any wisdom on this subject out there?   I did not see >or am not aware of the Elecraft > > >advisory. > > > >73, > > >Bob > > >K2TK > > > > > >[hidden email] >wrote: > > >I have seen the use of dope, sealers and so on strongly discouraged >by Elecraft. > > >matt, W6NIA > > > > > >Oct 22, 2008 10:30:51 AM, >[hidden email] wrote: > > > >There are at least two ferrite core transformers in the K3 that are > > > >supported only by their thin wires. I'm concerned that they may not > > > >survive a mobile environment. It would take only a dab of RTV > > >(silicone adhesive sealant) to secure them, but I don't know if this > > > >has been discusses or approved. > > > >Windy KM5Q > > >_______________________________________________ > > >Elecraft mailing list > > >Post to: >[hidden email] > > >You must be a subscriber to post to the list. > > >Subscriber Info (Addr. Change, sub, unsub etc.): > > > >http://mailman.qth.net/mailman/listinfo/elecraft > > > >Help: > >http://mailman.qth.net/subscribers.htm > > >Elecraft web page: >http://www.elecraft.com > > > > > > > > > > > > > >_______________________________________________ > > >Elecraft mailing list > > >Post to: [hidden email] > > >You must be a subscriber to post to the list. > > >Subscriber Info (Addr. Change, sub, unsub etc.): > > > > >http://mailman.qth.net/mailman/listinfo/elecraft  > > > > >Help: > >http://mailman.qth.net/subscribers.htm > > >Elecraft web page: > >http://www.elecraft.com > > > >_______________________________________________ > >Elecraft mailing list > >Post to: [hidden email] > >You must be a subscriber to post to the list. > >Subscriber Info (Addr. Change, sub, unsub etc.): > > >http://mailman.qth.net/mailman/listinfo/elecraft  > > > >Help: > >http://mailman.qth.net/subscribers.htm > >Elecraft web page: > >http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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