OK. So lets look at what 15-dB does with 10w; answer 316w. So if
you bought a KPA500 might feel that's wasting its full potential. If
you had a K3/10 or K3s/10 they put out 15w with the firmware
upgrade. That would result in 474w. 474/600 is 1-dB.
But then what is the cost differential between a new KX3 and a used K3/100?
Guess other factors might make one more attractive over the other.
My approach was a K3/10 and then a KX3, followed by a KXPA100. More
expensive than a basic K3/100 but you can buy a new KX3 or KXPA100
but not a new K3s. In my opinion (whatever that's worth) the KX3
measures up with my K3 pretty well for basic operating (plus smaller
foot print for the apartment liver). In full-out urban ham radio
competition the K3 wins!
Ed - KL7UW .. a long way from urbana
-----------------------
From: W0FK <llader...@earthlink.net>
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Rig forCW
AI4NS wrote
> Newer LDMOS amps don?t need much input power to develop full output. I am
> building a 600W amp that needs about 3watts input. My KX3 will do
> just fine. In fact I had an input attenuator made that will allow full
> power from the KX3 drive the amp at full power. I also have a K3/10.
>
> Mike
> AI4NS
That's fine for a homebrewed amp, but the FCC's 15dB gain limitation on
commercial amps makes the input power from a QRP rig like the KX3 limiting
relative to output power.
73, Lou, W0FK
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubus...@gmail.com
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