[Elecraft] kpa 500

[Doug Faunt]

Is there any way making the 100watt PA kick in before 12 watts?  My IC2KL
needs about 12W for 400W output, and I'd prefer to be using the KPA100 amp
at 12W then pushing the low power PA.  OTOH, which would give the cleanest
signal at 12W, the low power or the high power PA?

73, doug

packing tomorrow to leave VK9NN


> And if you care about transmitting the cleanest signal, you'll hold the
> K3/10 output to 10 watts PEP. Squeezing higher power out degrades the IMD.
> The Power control provides some additional room to be sure everyone can
> make
> the rated 10 watts.
>
> The same is true for the K2/10.
>
> Ron AC7AC
>
> -----Original Message-----
> Well, let's see if I can do this right:  15 db = 10 log (Pout / 12 watts)
>
> where 15db is the FCC maximum allowed gain.  Assuming that 12 watts
> will drive the KPA500, we solve for Pout as:  12 watts * 10^1.5 = 379
> watts
>
> So, if I did the calculation correctly, that would be legal maximum. I
> would suspect the gain to be less, perhaps in the 200-300 watt range
> for no other reason than it feels right to my mind. There may also
> have been an email from Lyle that mentioned something in the 200 watt
> range, but I'm not sure.
>
> 73, Byron N6NUL
>
>
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