Posted by
Bob McGraw - K4TAX on
Oct 16, 2018; 8:56pm
URL: http://elecraft.85.s1.nabble.com/KPA500-Clicks-Pops-tp7645665p7645693.html
I've tried to determine where the clicks originate without success.
I've loosened screws on the top and right side and tightened screws on
the top and right side. No difference. Perhaps someone at Elecraft will
add a comment in this regard.
I did observe that the 5 screws at the center of the top cover are
longer than the others. I'm really at a loss as to the somewhat
annoying Rice Krispies Snap Crackle and Pop. Still love the amp in
all other aspects.
73
Bob, K4TAX
On 10/16/2018 8:52 AM, ANDY DURBIN wrote:
> I found this quite annoying too. My approach was to try to understand how the Z bracket temperature varied relative to the heat sink temperature. I placed a thermistor on the front end of the Z bracket and another on the heat sink fin closest to the Z bracket. I logged the standard PA temperature and these additional thermistor temperatures for every transmission I made (still do). I established baseline temperature characteristics and planned to use this data to see if any mods I made changed the characteristics.
>
>
> Surprise! - When I though I had enough data to move on to the next step in the investigation it stopped clicking.
>
>
> Adding the thermistors only required removal of the front panel and the Z bracket screws were no touched. It continued to click after the thermistors were added and then stopped a few weeks later.
>
>
> The data show the rapid change in temperature is at the PA sensor only. The heat sink and Z bracket change much more slowly and never have a large temperature difference. Their temperatures do cross over though.
>
>
> One problem with temperature logging is that I had no data, except for my test notes , on the clicks themselves. I had planned to added some inexpensive sound detection modules and add this data to the logger. That's on hold until the clicks come back.
>
>
> It's really nice not to have the amp click continuously on every FT8 transmission. I wish I knew what fixed it.
>
>
> 73,
>
> Andy k3wyc
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