[Elecraft] Data mode and filters

[Joe Subich, W4TV]

On 2015-05-11 8:55 PM, Jim Brown wrote:
> I disagree, only because the signal is 12 dB weaker without the amp.
> And even at 100W, the K3 is cleaner than most rigs.

The K3 may be cleaner than low end 12V/100W rigs like the Icom 706mkIIg
7000, 7100, Yaesu FT-450/991, etc. but it is certainly *not* as clean as 
the other top of the line contest rigs like the Icom 7600/7800,
Yaesu 2000/5000, Kenwood 990, etc.  For example, ARRL measured the K3
at -29/-43/-46/-51 dB vs. -32/-49/-52/-54 dB for the Icom 7800 and
-31/-46/-54/-57 dB for the TS-990.  That makes the K3 3 to 6 dB *worse*
than other top of the line rigs at rated output.

Again, it's time to get past this silly attachment to PA stages that
can be run from a battery pack and move to higher voltage devices for
lower IMD.

73,

   ... Joe, W4TV


On 2015-05-11 8:55 PM, Jim Brown wrote:
> On Mon,5/11/2015 1:50 PM, Joe Subich, W4TV wrote:
>> Considering that a great many stations operate at the 100 - 150W level
>> *with no amplifier*, moving to 48V final amplifiers capable of -37 dB
>> or better IMD is *very* important.
>
> I disagree, only because the signal is 12 dB weaker without the amp. And
> even at 100W, the K3 is cleaner than most rigs.
>
> 73, Jim K9YC
>
>
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