Elecraft has made their design decisions for the K4.
Since someone suggested running a 100w 12v device at 60w then it
occurs to me to obtain 100-120w then run two devices in parallel or
push-pull. Should not increase weight or drive requirements by a
significant amount. Cost probably under 150%.
I bought the K3/10 initially because i mainly operate VHF thru
mw. Later I bought a 10w KX3. Then decided on the KXPA100 which
either can drive with about 5w for full output thru 24m. Of course
the KXPA100 uses 12v devices but a clever ham could build a two
device amp, instead. Only on 6m is full 8w drive required for 80w
output of the KXPA100.
I use the 1mw (nom) transverter interface to drive transverters on 2m
and above so output is clean. I have a 1000w linear* for 6m which
drives with 11w from the KXPA100 (have to switch on the 3-dB attn on
input to get that low). The 1000w amp runs with 48v as do my 2m
1500w and 600w 1296 LDMOS amps. I keep output at start of saturation
or lower on all the high power amps.
*6m 1000w amp is capable of 1600w 24/7 keydown AM operation on ch.2
TV, so is loafing at 1000w which is the limit of my 48v - 50A PS.
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubus...@gmail.com
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