On Fri, Aug 10, 2018 at 1:10 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Kees,
A few options that come to mind: ? 1) Add external box with switchable filters ? 2) Remove relays, create daughterboard to replace relays and LPF's plus additional relays at the far side ? 3) Cut up current traces, add straps at board edge, use current relays only at input to LPF ? 4) Same as above, but add a daughterboard with just the 3 extra relays at the board edge ? 5) Clean up what goes into the final somehow so the LPF's don't see so much crud ?? My current favorite: ? 6) Cut up the traces, dead bug three surface mount relays to the bottom of the board between L13,16,19,22, ? ? ? power the coils from the same source as the corresponding relays at KT1, KT2, KT3
The surface mount relays are a bit more expensive than the high-volume through hole relays. Mouser?80-EE2-12NUX-L is $1.95 quantity one, down towards $1.00 in volume. At 10.35mm high, they are just a hair shorter than the board standoffs provided with the uBitx, at 7.5mm wide they fit nicely in the space available.? (There are smaller relays at extra cost.) A grand total of $6 for an individual to clean up all but the (45mhz-FOp) spur on 15m-10m. The coils can be powered from the same drivers as the existing relays, ? user will see no difference once the rig is put back in the enclosure.?
Jerry, KE7ER
On Fri, Aug 10, 2018 at 08:43 AM, Kees T wrote:
Do you have a summary of the various options available ? or being worked, with pros and cons ? or do we just wait for a "Eureka" thread ??
It might be that everyone just takes his/her own path.?
