[Elecraft] K3 off frequency?

[David Olean]

Hello Elecrafters,

I had a similar problem with a K3 this past March. My brother had his K3 
die and I offered to look at it for him.  He claimed that he could only 
hear things on part of 80 meters. All the other bands were dead on RX 
and TX.  When I checked it, I found similar symptoms. At one point it 
started working again normally, then, with the next power cycle, it died 
again.  The problem was traced to the synthezizer.  Board layout 
diagrams are a bit sketchy for troubleshooting. I contacted Customer 
Support and a wondeful tech guy gave me some pointers on where to look.

The problem, while seeming to be serious, turned out to be a simple 
fix.  The 8 volt three terminal regulator mounted on the side panel had 
rolled over and died.  When I got everything running again, I made some 
notes (complete with pictures and arrows )  I tried to attach it to my 
response to N2RD and the reflector, but the  e mail was rejected as it 
was too big. I think the notes are pretty good as it shows where to look 
for voltages involved with the synthesizer, as well as LO signal levels 
and frequencies, on each band for the receive and transmit paths.

Is there a simple way I can post these notes so all can see it? I did 
send them to N2RD to help him figure things out.  If anyone is 
interested, I can send them the note. It is a WORD document and is about 
3.2MB in size.  The size is due to color pictures of the circuit boards 
showing the test points etc.

73

Dave K1WHS

On 10/7/2020 11:26 AM, Rajiv Dewan via Elecraft wrote:
> My K3 (with all S upgrades, ser #170) stopped working over the weekend.  I noticed that on 80m, while the frequency on the rig was 3574, the frequency reported by KAT500 was 3152 (or so).   No output on any other band.  I then checked reception of WWV - no reception of the 10Mhz signal.  I fed in a -50dBm signal at 3574KHz.  No reception.
>
> I am going to crack the case on the weekend.
>
> The only think I can think of is that something has shaken loose as the rig was transported by car a while ago.  Given the odd frequency, I am thinking that it may in the LO chain.
>
> Any thoughts?
>
> Raj, N2RD
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