[Elecraft] Loud relay click on CW using RX ant only on some bands

Oliver Dröse droese at necg.de
Mon Apr 13 13:34:40 EDT 2015


Because the COR relay only adds about 20-25 dB additional attenuation 
which might not be enough. Besides this you always have the delay of the 
relay switching. Even if it is quite fast (not sure about the COR in the 
K3, might be 5 ms or 30 ms, haven't checked what type of relay Elecraft 
used), there is a moment of no isolation so it could still destroy the 
front-end.

Whenever you hear the COR activating you should take it as the last 
warning and take according measures to cure the source of the problem, 
not it's symptoms. ;-)

73, Olli - DH8BQA

Contest, DX & radio projects: http://www.dh8bqa.de


Am 13.04.2015 um 18:48 schrieb Hank Garretson:
> Help please.
>
> If the K3 is protecting itself, other than the noise, why is an external
> protection device needed?
>
> 73,
>
> Hank, W6SX
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