[Elecraft] Rig forCW

[Edward R Cole]

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 <lladerman at earthlink.net>
To: elecraft at 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
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