#103

In this video we take a look at the AT-200 Antenna tuner. We find a broken wafer switch and repair it.
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[@billtheisen4230]

Had the band switch connected mostly to L5 broken loose due to someone who was inside of tuner and reinstalled porcelain cone that holds L5 wrongly to circuit board which put weight of transformer/coil on wafer switch breaking it. The repair involved epoxy glue on wafer ,epoxy left to dry for 4 days. The switch was repaired reinstalled however wiper on both switches was wrong by 180 degrees so removed L3 and L5 and remove band switches again and rotate wiper 180 degrees so wipers match each others rotation . My repair was delicate should have taken more pictures but repair was successful.

[@rustyrebar9647]

I had expected to see ceramic switch wafers instead of phenolic in an antenna tuner intended for the 100 -200 Watt PEP class of transceivers!! Excellent video, thanks for sharing, de PZ1CD , 73

[@TheRadioShop]

Ceramic would have been much better but to keep the cost down they used phenolic. It was a price war back then, Thanks

[@pierrelataillade7564]

I purposely did not watch the 520 episode earlier because of my bios towards them.... But I now smile and thank the man upstairs for pointing here. As I mentioned before in my comments on other projects of yours, Your approach to these presentations are very inspirational. I was glued to my iPad with this one. The learning curve is pretty wide as it relates to radio. You make it look easy. Thank you. 73s

[@TheRadioShop]

Thanks Pierre for following along on this. These are really great old radios and a lot of folks started their hobby with these and the 101's. I really appreciate the kind words my friend and glad you found it useful.

[@TRXLab]

puh that is always a work to get your fingers broken..well done Buddy. That is an real expert job

[@TheRadioShop]

Most appreciated Peter. Sometimes we have to dig in deep to get the solution. She is good as new now. Thanks for stopping in ole friend.

[@johncunningham5435]

Excellent work Buddy! the wafer switch is no walk in the park, but when parts are not easy to come by, that is when imagination and creativity come in. "Well Done"

[@kellingc]

I like the way you work and troubleshoot. Thank you for posting this. I'm teaching an extra licensing class - I think I'll bring out a couple of antenna tuners, and see if the students can recognizer the type of networks used. You inspired me with this video.

[@MrHarveyluke]

Another great video. This is a very neat and compact transmatch. I didn't see a power jack on the back and I think it would have been neat for Kenwood to have that meter on the front lighted, especially for night time operation. I guess a good mod would be to put some 12 v. LED's in the meter case and fix some way to turn them on. To us who have been hams for 50+ years, it would be nice to see it! HI 73, Harvey KM4JA in Alabama

[@TheRadioShop]

You know Harvey I was thinking the same thing about adding leds to the meter. Can power them from the radios 12 volt output connector. Think I will do that.

[@rustyrebar9647]

@@TheRadioShop You can power a few LEDs from a little rectified RF, if properly bypassed and filtered to avoid harmonic generation ....

[@lylewatts6370]

A great video again. Those pesky wafer switches. Thanks for showing us how to repair them. I have a lot of those in all my old radios. I learn something new on every show you do and thank you for your great ability that you share with the viewers. Lyle

[@TheRadioShop]

Thanks for those very kind words Lyle. It is really fun doing this. Glad you like them. Those switches only look hard but really easy.

[@rico1319]

What a great surgeon! Another job well done my friend 👍👍🇨🇱

[@TheRadioShop]

Thanks Rico. Sorry for the late reply. Life is busy!

[@rico1319]

Always good to be busy. It allows you to survive another day.👍

[@MichaelLloyd]

Nice job on the wafer switch. I'll remember what you did if I ever run into that problem.

[@TheRadioShop]

Cool Michael. Worked like a charm. Thanks

[@mikesradiorepair]

Have you ever noticed it's always the wafer switches that's buried in the middle that always breaks. It's never the easy to get to one on the outside edge.

[@PapasDino]

Just like your sandwich bread will always fall mayo or peanut butter side down onto the floor, it's just physics! Buddy, what was the brand name of the electronics contact cleaner you're using?

[@MrBugsier5]

loll, yea, its never as easy as this one! always the most difficult, whit the most wires atached, and out off reach!

[@TheRadioShop]

Always seem to work that way for some reason. Murphy at work I guess lol.

[@TheRadioShop]

Hate it when my sandwich falls PB&J down first! Dino I think it was the Ideal 40-610 for the cleaning of this. Followed by alcohol.

[@TheRadioShop]

You got that right!

[@cuban9splat]

Nice job on this very delicate repair job. I am really enjoying the TS-520 series of repairs. Thank you for sharing it with us. Another big thumbs up! 73 DE K7RMJ Frank

[@TheRadioShop]

And a big thumbs up to you Frank for watching!

[@jaywardjulian6163]

Very nice and well explained. Just curious I'm trying to find a video on how to Tune an ATR-15 Tuner but unlucky o thought maybe it's a bit closer to have an idea how to do it by watching some part of your demo. Thank you and 73. De KH2ZZ

[@MrBugsier5]

its a nice set all togeter whit the other stuff, when she is fully schecked out!, nice rig!

[@TheRadioShop]

Thanks, This setup will be a winner and fun to operate

[@johncliff5417]

That certainly was one dam good repair. I have repaired/replaced wafers myself and so very much appreciate the work done to compleat the job. 73 de G0WXU - John.

[@carlwaldrop9152]

I have a kenwood AT-230 ,one of the plastic rods for the tune capacitor knob broke ,do you have any idea were I may find one . Thanks nice video

[@TheRadioShop]

Hi Carl. I would have no idea where to find an original since that was a custom part. You may be able to find something to substitute it with like a plastic shaft from an old variable pot. Sometimes you can find fiberglass rods at craft stores that could be modified and used.

[@scottlee1211]

Another great video of tedious repair work! Thanks for posting Buddy

[@TheRadioShop]

Thanks for watching Scott. Was a little tough to get to.

[@kroghsmachineshop4708]

Great repair👍 it could be fun to see what kind of antennas you have, enjoyed it video 😊

[@TheRadioShop]

I will have to do a video on that one day. Thanks

[@waynecarlson3736]

Anything for ts520 is my love have full set of all parts

[@jaritkeith8931]

Very nice video. I plan to check the bracket fit to the bottom cover on mine, good thing to be aware of. I wonder of any old Kenwood parts radios might have an exact wafer in some switch stack? If so, maybe a perfect replacement could be done. Do you suggest any lube on the contact assembly such as the Deoxit type products? Thanks for the time to share this info on the older KW gear.

[@TheRadioShop]

Thanks Jarit. Always a good idea to check the alignment of these brackets. Deoxit products are great. Another good assembly lube is G-n from Dow Corning. And sometimes silicone and while lithium grease is fine.

[@jaritkeith8931]

Appreciate the info and comments. There are several Deoxit products out there maybe. Will do some reading on them. Also good to know about the other products you have found useful. Thanks for all the good KW info.

[@waynecarlson3736]

Always way into the middle where you cannot reach until you take everything else apart.. I need this, ALMOST a complete setup now I need another thingy. If I am correct there is also a small monitor for the 520. DANG more money

[@TheRadioShop]

Yep, never easy to get to. Yes the SM-220 monitor. I have 2 of those. Thanks Wayne.

[@davidlegault9745]

Neat repair Buddy. Regards, Dave

[@TheRadioShop]

Thanks Dave

[@donaldshields2483]

Do you have any Kenwood ts. 440 s That works that you would sell you will let me know if you want to happy new year and God bless

[@CharlieTechie]

Interesting repaid, thanks for sharing.

[@TheRadioShop]

Appreciate it Chuck and thanks for watching

[@vintagecameras9623]

Thank you

[@TheRadioShop]

And thank you

[@dennisqwertyuiop]

great repair thank you for video

[@TheRadioShop]

Thanks for watching Dennis

[@douro20]

I have a six-pole dual section ceramic wafer switch, if you want it I might send it your way...

[@TheRadioShop]

Thanks, that may come in handy!

[@helipilot727]

I feel like the unit was dropped which broke the wafer and bent the bracket

[@TheRadioShop]

That is possible yes, Although I see no metal damage but that is most likely the cause

[@987kestrel]

Looks like a job for a 3d printer.

[@TheRadioShop]

Man I love to have one of those. So many things can be made with it.

[@DonDegidio]

Hi Buddy, Or should I say Miracle Worker Buddy. :-) FB on the repair. 73 WB3BJU

[@TheRadioShop]

Thanks for the nice words Donald. It is really easy.

[@user-cz8yv4zw4h]

73!!!from Russia!