Rotary switch replacements?

[James Stephenson]

Hi all, it's a shame to see this project is discontinued, though with the NanoVNA and the like I guess it makes sense. That said, I still prefer the SARK for field use, and mine (first revision I think) sees a fair bit of that.

Recently the rotary switches on mine have stopped working, and I can't find ones that look the same. Does anyone have the model and possibly supplier for these so I can replace them. Would be a shame to see something like this become a paperweight because of a small plastic part.

James

[John G3PQA]

Hi James,
I agree, it is a great shame. I still prefer using my Sark-110 to all other portable analysers.
In my opinion Melchor's carefully developed design and versatile software is excellent and much easier to use than the NanoVNA which I find cumbersome in comparison.
Near VNA measurement accuracy in many functions in Smith Chart and rectangular modes, matching n/w calculation, cable loss, simulated TDR mode with selectable distances, coax Vf, signal generator, etc. etc., all in a shirt top pocket. What more can we possibly want?
I guess you have looked on the "resources" section of the Sark-110 website for spares suppliers.
Where are you located? Call?
73
John

[John G3PQA]

James, I assume you mean the navigator button

Part Number: SLLB510100  ?

If so they are available from both Mouser and Ebay.

John

[Melchor Varela]

Hi James,

Before replacing the switches you might try to clean them with isopropyl alcohol or any switch contact cleaner.

Best regards, Melchor EA4FRB 

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[James Stephenson]

Hi all

Thanks for all the feedback, I did a three part fail on this one. Completely missed the repair part of the site, didn't even think of trying to clean before replacing, and got contact cleaner between the LCD and backlight. That said, I'm happy to say I've got a fully functional unit again just by cleaning the switches, though the spots between the LCD and backlight is a bit of a shame. With some luck I'll get another 8 years out of this guy.

James