[Elecraft] K3 - stuck at MCU LD we upgrading software

[Tom]

Are folks hooking their radios directly to the power supply without a fuse
inline?  I noted that the Elecraft supplied cable for my K3S did not
include a fuse.


73,
Tom - KQ5S

On Sun, Jan 29, 2017 at 12:49 PM, George Thornton <
gthornton at thorntonmostullaw.com> wrote:

> The history of my Astron 35 metered power supply is that it has been moved
> around a lot because I have brought it to Field Day for multiple years.
>
> I took it apart today and found that although the connection between the
> power leads and the bolts was tight, the connection between the bolt and
> the housing of the power supply had worked a bit loose over the years.   I
> took things apart and tightened the connection between the case and the
> bolt.
>
> It is all back together and working fine.  I also have a direct connection
> between the PS and the K3 using thicker wire.
>
> The K3 is working fine right now.
>
> In the past I suffered loss of transmit power although RX was fine.  I
> don’t remember the error message but I think it was ERR DSP.  With every
> failure reloading the firmware and calibrating power cleared it up.   The
> information I had was that this error can be associated with erratic power
> supply issues.
>
>
>
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don
> Wilhelm
> Sent: Saturday, January 28, 2017 7:28 PM
> To: James Walker <jimmy.walker at outlook.com>; N2TK, Tony <
> tony.kaz at verizon.net>
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 - stuck at MCU LD we upgrading software
>
> Jimmy,
>
> You should see little voltage sag on transmit, especially at QRP levels.
>
> Compare the voltage directly at your power supply terminals between
> receive and transmit. If it stays up, then check your power cable to
> the K3 for adequate size wire and good connections. If you have a DC
> power distribution device like the RigRunner, remove the K3 from it and
> connect direct from the power supply to the K3.
>
> OTOH, if the voltage at the terminals droops during transmit, open the
> power supply cover and remove the bolt terminals - clean the solder lugs
> on the inside and the bolts, then reassemble making certain the bolts
> are tight. If those bolts turn even a little bit when tightening the
> external bolts, they are not tight. You must have tight connections at
> the power supply.
>
> 73,
> Don W3FPR
>
> On 1/28/2017 3:49 PM, James Walker wrote:
> > Yours is not the Astron power supply I was using. Mine was the 35A,
> transformer style, not switching, with dual meters. I’m still using it for
> other radios with no problem. And yes, I did check the voltage reading on
> the K3/100 and it did reduce severely under any load, even QRP. That’s a
> strange quirk in the equipment but I think that’s it.
> >
> > Jimmy Walker
> > WA4ILO
> > Macon, GA
> >
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