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Here's a couple different web pages describing how capacitors get marked these days.
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From that, 33K is a 33pf cap with a 10% tolerance, and 33J is a 33pf cap with a 5% tolerance.
Apparently they made a substitution due to the 5% parts being unavailable.
C402 gets used in the receiver bandpass filter for 17 and 15 meters, so it covers
at least 18 through 21 MHz and probably more.? I'm confident a 10% part would be fine there.
Can be verified with a sweep of the filters after the rig is completed using the tests
described in the assembly manual.
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That 15J cap is a 15pf cap, but C542 needs a 68pf cap.?
C542 is used in the transmit LPF for the 6M band, without that cap it will
probably receive well enough on 6M but it won't transmit very well.??
You could probably live forever without C542 if like me you don't have an antenna for 6m.
To replace it, look for a disc ceramic cap with radial leads, 5% (or 10%) tolerance,
voltage rating of 100 Volts or more, temperature stability of NP0 or C0G,
and lead spacing of 2.5mm.? Here's a selection on digikey:
https://www.digikey.com/en/products/filter/ceramic-capacitors/68-pf/60?s=N4IgjCBcoMxaBjKAzAhgGwM4FMA0IB7KAbRACYBWABjnzBgBYqQBdfABwBcoQBlTgE4BLAHYBzEAF86DeCCSQ0WPIRIgAbAE51ZTSDpUq6gOwQZVABwML%2B8BWO6zd4zDBlbYC2QuXb17wwUrBzckHyCohLSGnrQ8igYOPhEkKQMYJ6axsEgXDz8wuJS%2BNQ2cQpKSaqp4DDG6R4MZAxwbLmh4YVR%2BGRUDLGICcr4AG4iUIIArioppOoWAATsAGI5eWEAqiJCnADyyACy2KiYkwLYxSAAtO7lEwLTyWpB%2BHosktHqckIAJjxXYCoTnWIFsnAAnuwLmETkgPkA
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Jerry, KE7ER
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On Sun, Nov 17, 2024 at 05:56 AM, Lasse wrote:
Hi, have started on my QMX+ build kit and started on chapter "2.5 Install all the ceramic capacitors"
Have had an "item count" that I have them all but find out that I have two that are not listed in the manual.
15J I have one too many of, and I can't find 33K in the component list.
After distributing all components to the correct location (paper sheet), I am then missing C402 which should be marked 330 or 33J and then I am missing C542 which should be marked 680 or 68J
Have put everything together on a sheet and triple checked values. Can any of the ones I can't find be used or do I have to get what is missing?
