[Elecraft] Data mode and filters

[Walter Underwood]

Unlike other high-end rigs, the K3 was designed as a transportable radio. It is almost certainly the best Field Day radio ever made.

Every design has tradeoffs. If Elecraft was directly targeting the TS-990/HIlberling market, I have no doubt that you’d see a 50V PA. But they are beating all of those heavy rigs in a small package. Yes, I trust Jim Brown’s results. Though I’m a software guy now, I started my career as a DSP engineer. 

wunder
K6WRU
CM87wj
http://observer.wunderwood.org/ (my blog)

On May 11, 2015, at 6:45 PM, Joe Subich, W4TV <lists at subich.com> wrote:

> 
> 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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