Dave speculated about the KFL1-2 filter board:
> ...aren't all the boards the same except for the frequency
> determining parts (toroids and caps)?
Yes, plus the two heterodyne crystals.
> you could just swap out those parts on your 20/30 board.
> Pretty sure the caps and cores would still be
Again, I'm not sure about this, but aren't all the boards the same
except for the frequency determining parts (toroids and caps)? If so,
you could just swap out those parts on your 20/30 board. Pretty sure
the caps and cores would still be available somewhere, and somebody is
bound to have
I apologize. I’ve dumped the digest, so it won’t happen again.
I was hoping we could poke around and maybe find new, old stock parts that
might meet the specs for the 4-band board. If that doesn’t pan out, I think
I’ll see if someone is willing to part with a 2-band 40/80 board.
Regards,
Randall,
Wayne was referring to the 4 band board which had 16 wide range trimmers
with a low temperature coefficient.
The 2 band board does not have that limitation. All the capacitors are
fixed and the ones in the frequency determining circuits are C0G or NP0
types.
Please do us all a
ssage: 1
> Date: Sat, 30 Jun 2018 09:57:47 -0700
> From: David Gilbert
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K1 Band Boards
> Message-ID:
> Content-Type: text/plain; charset=utf-8; format=flowed
>
>
>
> What's not so hot about 20/30?? Seems to m
The K1 band modules, as designed, required high-value trimmer capacitors with a
low temperature coefficient. Unfortunately, these have become unobtainium.
The KX2 and KX3 take a different approach. They still have per-band filters
with excellent stopband attenuation, but they don’t require
What's not so hot about 20/30? Seems to me that's still a good combination.
But I thought the reason the boards aren't available anymore was that
critical parts weren't available anymore. If so, having the boards
isn't going to help you much.
There were several of us who bought the
I've rejoined the list after some time away.
I built a K1 several years ago with 2 bands (20/30). It turns out that's
not so hot anymore, and Elecraft sold down their old inventory of band
boards. Does anyone know if they publish board layouts if folks wanted to
try to reproduce them on their
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