Why not add a 1 dB or 2 dB attenuator in line at the input of the amp?
That would allow for a bit higher drive power from the K3S. Three
carbon resistors will make a nice Pi attenuator.
73
Bob, K4TAX
On 11/21/2019 9:42 AM, [email protected] wrote:
I have operated RTTY with my K3S in the 11 watt range not knowing that
this was bad for the LPAs. It would be nice if the Elecraft K3/K3S
would allow the option to turn on the 100 watt power amp and a lower
power setting.
John KK9A
dgb ns9i wrote:
I run a lot of rtty and digital with my K3. I always set the amp to the
mid range getting 8-900w out. It takes only 8-11 w drive from the K3 to
accomplish that.
Note: SPE recommends to run the amp in Mid Range for digital operation.
When I first got the amp I made the mistake of running it in the high
range and melted the copper heat sink, which was not considered a
warranty repair, and was an expensive lesson learned.
Over the course of the 3 yrs. that I've owned the amp, I have blown 4
LPA's in the K3 running it at 8-11w. With latest repair the tech
informed me that the "LPA is not rated for continuous duty at upper
power levels (like the digital Modes)" They suggested running 13w vs 11w
so the LPA wouldn't be used. If I do that it over-drives the SPE in the
mid-range.
What is my suggested recourse?
thanks 73 Dwight NS9I
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