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If I can put together a $100 CAD order, I get free shipping. Mike, do you know what the threshold for free shipping is in the US? I have a mailing address in the Ohio I can use... tia de va3rr

Hi, Paul Farnell Mouser Stores

Mouser and Digikey have minimum fixed shipping. I make a list of parts and when I have enough to justify the price I send in an order. Mike N2MS

digikey uk can go fcuk themselfs ?12 shipping on a ?1.07 order,i think not!

also digikey have some listed but none in stock and saying backorder not possible,any ideas where i can get replacements but possibly 750v versions?,cheers Paul.

well i replaced the cap with 3 mica caps in parelell totaling 218pf,now tho i have no oled display,i have tried good known replacements but nothing,it has the 5v supply going to it,any ideas?.73

Hi, 220pF

Paul, The schematic should be in this GitHub link: https://github.com/Dfinitski/N7DDC-ATU-100-mini-and-extended-boards 73 Evan AC9TU

Hi, 220pF 73

Paul, As others have recommended I would use the Vishay or Mica Capacitors. I have a Chinese made ATU-100 and run a maximum of 50 watts since I don't trust the quality of the capacitors. Mike N2MS

If you don't want to use leaded SM caps, Vishay makes a nice RF cap in 1111 format that just fits. VJ1111D221KXLAT. That's what I used in 'project overkill'. The relays or the pcb traces will arc

Surface mount silver mica capacitors exist. You have to step up to the larger 1210 size rather than 0805 to get parts that are rated for 500V; the 0805 ones are only rated for 100V. You're unlikely to

its a 220pf 500v silver mica according to the circuit diagram its probably a 220pf ceramic in 0805 size from what I observe of an unbuilt PCB - hth

any idea of the c value?

Hi paul go on digikey and get silver mica caps > 500v .. chinese atus use 50v or 100v versions which fail. 73's Jason 9H5BM wrote:

or where i can find? replacement,nothing on ebay.

Hi folks,i was trying my atu-100 on my doublet/ocfd on 80m,it tuned down to about 1.2-1,then after a min of key down it smoked,heres a pic of the cooked cap,dous anyone know the value and type so i

Hello Yan, do you mean the pad marked in red in the picture below? I don't think that is the fault, it is just where the braid of the cable going to the TRX is grounded. See the pictures below. I was

Hi, everyone. I'm BI6MPW from China. I may have found some problems in the process of learning and making atu10. When I studied this version of PCB of zao, I found a doubt that could not be ignored,

Hi Stefan, I never tried #43 core on 6m band, so its difficult to say. I measured efficiency of different winding styles end even KN5L method shows rapid drop of efficiency above 30MHz. So even if SWR