Fwd: RE: [Elecraft] K2 can't reduce power

Mon Feb 17 05:28:01 2003

Paul answerd to my question, but only to me, not to the group. Thanks Paul.
I will check the FET Q3 and Q4. I detected a blown FET Q5 (sidetone) on the
Control Board. May be this was not the only one.

Regards
Frank, DH8JF

--- Weitergeleitete Nachricht / Forwarded Message ---
Date: Mon, 17 Feb 2003 09:36:27 -0000
From: "Fletcher, Paul" <[email protected]>
To: 'Frank Jonischkies' <[email protected]>
Subject: RE: [Elecraft] K2 can't reduce power

> Frank,
> 
> I had exactly the same problem when building my K2. In my case the problem
> was caused by the T/R switching (blown FET on the control board) but this
> can also be caused by an open circuit RFC in the PA stage (RFC16 I seem to
> remember - but someone will correct me if I'm wrong) check the 8R and 8T
> voltages to make sure they are switching - 8R must be close to 0V during
> transmit and if it isn't that's your problem.
> 
> Hope this helps.
> 
> Regards,
> Paul (M3BNF)
> 
> -----Original Message-----
> From: Frank Jonischkies [mailto:[email protected]]
> Sent: 17 February 2003 01:26
> To: [email protected]
> Subject: [Elecraft] K2 can't reduce power
> 
> 
> Hello,
> 
> I finished assembling K2#3227 and run the first transmitter test. When I
> press tune (or keying the rig) the display shows HiCurr and an external
> power meter with dummy load shows nearly 16 watts. I resoldered all
> junctions in the amplifier. I did the receiver trace, all in the range. I
> can't measure any values in transmit mode because the transmit is switched
> off immediately. Looks like the ALC is not working. Which parts I have to
> check? Any hints?
> 
> Regards
> Frank DH8JF

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