Looking at pic #2 seems to me that adding a 47nF capacitor to ground at each coil terminal as Arv hypothesized would make the uBitx a leap close to be legal compliant with respect to the harmonics.
Il 14/ott/2018 20:31, "Kees T" <
windy10605@...> ha scritto:
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> Plots of the coupling between N/C contacts on either side of the relay (which will include the armature) and what they look like with the addition of a 47nF capacitor to ground at each coil terminal.? You can see the dB of isolation improvement.
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> #1 HK16F-SHG "16 pin" relay (like the original uBITX relays)
> #2? same as #1 but with the 2 capacitors added (see less coupling ....a good thing).
> #3 NAIS TQ2-H "10 pin" smaller relay which does not have the long armature
> #4 same as #3 but with the 2 capacitors added (less coupling .....a good thing)
> #5 Axicom .....TBD waiting for the relays.
> #6 same as #5 but with the 2 capacitors added (less coupling .....a good thing)
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> 73 Kees K5BCQ
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