K2 slug-tuned inductors
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K2 slug-tuned inductors
 
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The green plastic tuning tool is too wide to fit in the slot of the narrow slot slug-tuned inductors. Is it safe to use a screwdriver on the small slot 1µH inductors?
Thanks, --mark/ae0mm ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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On 2018-09-21 10:41 AM, AE0MM via Elecraft wrote:
> The green plastic tuning tool is too wide to fit in the slot of the > narrow slot slug-tuned inductors. Is it safe to use a screwdriver on the > small slot 1µH inductors? I'm assuming the screwdriver would be a metal one. It would let you turn the slug but you would have to use it with care as it could damage the top of the slug. Also the metal screwdriver can affect the inductance of the inductor and throw off the adjustment. Your safest option is to shave a little off each side of the plastic tuning tool to make it fit. You shouldn't need to shave much off it to make it fit. -- Cheers! Kevin. http://www.ve3syb.ca/ | "Nerds make the shiny things that https://www.patreon.com/KevinCozens | distract the mouth-breathers, and | that's why we're powerful" Owner of Elecraft K2 #2172 | #include <disclaimer/favourite> | --Chris Hardwick ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: K2 slug-tuned inductors
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Ended up using scissors to trim a plastic toothpick into a slug-tuned inductor adjustment tool.
--mark/ae0mm ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Friday, September 21, 2018 10:22 AM, Kevin Cozens <[hidden email]> wrote: > On 2018-09-21 10:41 AM, AE0MM via Elecraft wrote: > > > The green plastic tuning tool is too wide to fit in the slot of the > > narrow slot slug-tuned inductors. Is it safe to use a screwdriver on the > > small slot 1µH inductors? > > I'm assuming the screwdriver would be a metal one. It would let you turn the > slug but you would have to use it with care as it could damage the top of > the slug. Also the metal screwdriver can affect the inductance of the > inductor and throw off the adjustment. > > Your safest option is to shave a little off each side of the plastic tuning > tool to make it fit. You shouldn't need to shave much off it to make it fit. > > -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > > Cheers! > > Kevin. > > http://www.ve3syb.ca/ | "Nerds make the shiny things that > https://www.patreon.com/KevinCozens | distract the mouth-breathers, and > | that's why we're powerful" > Owner of Elecraft K2 #2172 | > #include <disclaimer/favourite> | --Chris Hardwick > > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Elecraft mailing list
I would get a new wand or file one down.
Some of those things get difficult to turn and the screwdriver breaks the core. Is there anyway to loosen them up before they break? Chuck Hawley [hidden email] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: [hidden email] [[hidden email]] on behalf of AE0MM via Elecraft [[hidden email]] Sent: Friday, September 21, 2018 9:41 AM To: Elecraft Reflector Subject: [Elecraft] K2 slug-tuned inductors The green plastic tuning tool is too wide to fit in the slot of the narrow slot slug-tuned inductors. Is it safe to use a screwdriver on the small slot 1µH inductors? Thanks, --mark/ae0mm ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]
Chuck, KE9UW
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In reply to this post by Elecraft mailing list
A metal screwdriver might affect the inductance. There are several
inexpensive tuning tools made with a plastic handle and a small thin metal blade, for example: https://www.digikey.com/product-detail/en/bourns-inc/H-90/H90-ND/262571 I used a similar tool when I built my K2. Bob, N7XY On 9/21/18 7:41 AM, AE0MM via Elecraft wrote: > The green plastic tuning tool is too wide to fit in the slot of the narrow slot slug-tuned inductors. Is it safe to use a screwdriver on the small slot 1µH inductors? > > Thanks, > --mark/ae0mm > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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The last time I had to do this and didn't have a dedicated tool, I took a
Chinese take-out bamboo chopstick and carved it to fit the slug. It's fairly easy to do and if you mess it up you just cut off that part and try again. The bamboo is strong but easy to carve, and it's non-magnetic of course. On Fri, Sep 21, 2018 at 5:39 PM Bob Nielsen - N7XY <[hidden email]> wrote: > A metal screwdriver might affect the inductance. There are several > inexpensive tuning tools made with a plastic handle and a small thin > metal blade, for example: > > https://www.digikey.com/product-detail/en/bourns-inc/H-90/H90-ND/262571 > > I used a similar tool when I built my K2. > > Bob, N7XY > > On 9/21/18 7:41 AM, AE0MM via Elecraft wrote: > > The green plastic tuning tool is too wide to fit in the slot of the > narrow slot slug-tuned inductors. Is it safe to use a screwdriver on the > small slot 1µH inductors? > > > > Thanks, > > --mark/ae0mm > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[hidden email] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [hidden email] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] -- -+-+-+-+- Jenny Everywhere's Infinite: Quark Time http://quarktime.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by ke9uw
Chuck and all,
Those particular inductor cores with the narrow slot are difficult to break, and they seldom stick. Since I adjust them during repairs, I would wear out many tuning tools in short time. I bought a ceramic screwdriver with a 1/8 inch wide blade. I have another with a 5/32 inch wide blade that I use for adjusting those new trimmer capacitors in plastic cases. 73, Don W3FPR On 9/21/2018 5:00 PM, hawley, charles j jr wrote: > I would get a new wand or file one down. > Some of those things get difficult to turn and the screwdriver breaks the core. Is there anyway to loosen them up before they break? ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Don...
Where did you find a ceramic screwdriver? ...robert On 9/21/2018 21:52, Don Wilhelm wrote: > Chuck and all, > > Those particular inductor cores with the narrow slot are difficult to > break, and they seldom stick. > > Since I adjust them during repairs, I would wear out many tuning tools > in short time. I bought a ceramic screwdriver with a 1/8 inch wide > blade. I have another with a 5/32 inch wide blade that I use for > adjusting those new trimmer capacitors in plastic cases. > > 73, > Don W3FPR > > On 9/21/2018 5:00 PM, hawley, charles j jr wrote: >> I would get a new wand or file one down. >> Some of those things get difficult to turn and the screwdriver breaks >> the core. Is there anyway to loosen them up before they break? > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > -- Robert G Strickland, PhD ABPH - KE2WY [hidden email] Syracuse, New York, USA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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They're readily available from Amazon.
https://www.amazon.com/Hanperal-Slotted-Ceramic-Alignment-Screwdriver/dp/B01AJC29OI Al, K2ZN Sent via mobile -------- Original message --------From: Robert G Strickland <[hidden email]> Date: 9/21/18 23:07 (GMT-05:00) To: [hidden email] Subject: Re: [Elecraft] K2 slug-tuned inductors Don... Where did you find a ceramic screwdriver? ...robert ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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