Posted by
Steve Ellington on
Feb 05, 2009; 6:57pm
URL: http://elecraft.85.s1.nabble.com/K3-Relay-noise-tp2269079p2276609.html
Apparently Elecraft is not aware of the relay and very few of us can hear
it. I had my K3 for many months before hearing it. It's as if something
suddenly got it started clicking. Either just a few rigs do this or most of
us are nearly deaf. Elecraft, can we get an answer on this?
Steve Ellington
[hidden email]
----- Original Message -----
From: "Classe Bergman" <
[hidden email]>
To: <
[hidden email]>
Sent: Thursday, February 05, 2009 12:54 PM
Subject: Re: [Elecraft] K3: Relay noise?
>
> I have heard this relay noise since I put together my K3 kit s/n 1484 in
> August 2008. I always use full QSK, and then it's easy to hear the clicks
> if
> the room is silent.
> I was little surprised in the beginning, as I had read that the T/R
> switching should be all electronic. I didn't think no more about that, as
> I
> have KPA100, KAT3 and KXV3 installed I thought that there was a small
> relay
> somewhere on the options modules.
>
> Today I did some tests, and took the top cover off and tried to listen
> carefully after the clicks. I am sure that it comes from a relay located
> somewhere under the KPA100 module. Not from KAT3 or the LP filter relays.
>
> There is no change in clicks if I put the radio in TX TEST mode or have
> full
> RF output, so it is not RF or high current related.
>
> It very hard to hear if I close PTT or a key manually or tap XMIT, but it
> is
> still there.
>
> CW mode , SSB mode or KPA100 disabled, it is still there every time T/R is
> switching.
>
> After a quick look at the K3 LPA schematic, I can se a small relay K1, "3
> dB
> attenuator". What is that relay doing ? Can that be a candidate for
> causing
> the noise?
>
> I have just done the same tests with an other K3 that was factory build.
> Both radios produces exactly the same relay noise.
>
> I am using the lastest software in the radios now, but it have been the
> same
> thing with older software.
>
> 73 Classe SM3GSK
>
>
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