[Elecraft] KX3 reboot only on JT modes?

[Brian Waterworth]

I can run JT modes for hours with my KX3/PX3.  I don't have a KXPA100.
>From a gross component perspective, try removing the kxpa100 from the chain
and see if that results in a different behaviour.

I do monitor my osc temp and have the pro audio heat sink.  After hours of
operation calling cq and responding to QSOs at 5w, I see temps in the high
40Cs.  But all is ok with the kx3 at this temp.  I also performed the
extended temp compensation; a must for JT modes.  I am serious about the
last comment.  You must do the extended temp compensation.

What is your heat sink situation and what is your osc temp during operation?

Regards
Brian
VE3IBW


On Mar 21, 2017 7:48 PM, "rich hurd WC3T" <rich at wc3t.us> wrote:

But only on JT modes?   And this is a 7XXX serial number KX3.

I do not think this has anything to do with the physical power connections,
but I did inspect them and they were all tight.
Going to pay more attention to see what might be going on during these Tx
cycles.

On Tue, Mar 21, 2017 at 3:17 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:

> Rich,
>
> First check your power cables carefully for any sign of looseness.
> If none found, try wiggling the KX3 2.1mm power plug to see if that
> induces the failure.  You may have a failed power jack.
> Early KX3s did not have the power jack glued to the board and could fail
> (even with the right angle power plug).  The failure would be
intermittent.
>
> I don't think it has anything to do with your operating mode.
>
> 73,
> Don W3FPR
>
>
> On 3/21/2017 2:47 PM, rich hurd WC3T wrote:
>
>> Okay, here's an odd one and I couldn't find any suggestions in the
>> archives
>> or using Google-fu.
>>
>> I can run any mode with my KX3/PX3/KXPA100 station with no incident
except
>> for JT modes; using WSJT-X, I will complete a Tx cycle and randomly the
>> KX3
>> will bounce (power off/power on.)
>> 9 times out of 10, I'm operating at 3W.   I'll sometimes bump to 5.  To
>> test this, I have also bumped it to 11 watts to kick the amp in and I get
>> the same reaction; that is, sometimes (but not always) the station just
>> decides it's had enough and the power bounces.   Power supply is a Samlex
>> SEC-1223.
>>
>


--
73 (or 72 for the QRP folks),
Rich Hurd / WC3T
Northampton County RACES
EPA-ARRL Public Information Officer for Scouting
Latitude: 40.761621 Longitude: -75.288988  Grid: *FN20is*
40°45.68' N 75°17.33' W
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