[Elecraft] Sequencer keying with K3/XV-144 without rigblaster?

[AD6XY]

Andy Cook, G4PIQ wrote:
> 
> 
> Now just need to find out why some of the Amphenol N-type relays used for
> high power switching have got into a state that can take up to 0.5 second
> to release after volts have gone. Maybe they've got magnetised - they were
> originally 115V AC relays re-wound for 28V DC, but one has already bitten
> the dust from the consequent hot switching where the sequencer didn't
> figure on needing to take 1 second to changeover!
>  
> 

This happens when you spot weld the contacts with excessive RF. How did you
manage that with only 400W?

Other possibilities are you are not giving the pulse of energy from the coil
somewhere to go and so the field can not collapse as quickly as you might
wish. Then the spring might have worn out, they don't have indefinite life.
If they really are magnetised, swap the coil windings round.

At least it is not the other way around, 1/2 second to stitch to TX would
defeat the sequencing.


I agree it can take some time and 20mS is not enough 60mS should be enough,
if not it is going to make rapid fire operation difficult, Half a second is
a long time in contests.

Mike
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