[Elecraft] using K3 with Ameritron RCS-12 antenna switch

[AB2E Darrell]

Hello all,
Is anyone using a ready made cable to interface the Ameritron RCS-12 auto 
switch to the K3?
If so, let me know what you are using (offlist).

Thanks and 73,
Darrell AB2E
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[Elecraft] Looking for K2 SN 5251

[wks9478]

All,

Wondering if anyone on this net has K2 SN 5251. If you do, please reply to
me at wks9...@charter.net  .

Thanks,

Bill K5EMI

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Re: [Elecraft] Where to put the wattmeter

[Jim Brown]

On 4/21/2023 8:40 AM, Steve L wrote:

Rob argues we have many excellent receivers available to us today - and goes on 
to argue today’s transmitters are the problem  loading the bands with splatter, 
phase noise, key clicks and other undesirable artifacts, with Elecraft among 
the cleanest (and several other popular radios among the dirtiest).

Look up Rob on YouTube for several excellent presentations.


I'm happy to see that Rob has finally awakened to the transmitter 
problem, which I started banging the alarm about nine years ago.


Analysis of Noise Performance of Selected HF Transceivers  For nearly a 
decade, Rob Sherwood, NC0B, has been testing and publishing comparisons 
of the receive performance of selected transceivers, and receive 
performance has greatly improved as a result. Transmitter performance 
has been largely ignored. This document, which compares the data from 
ARRL lab product reviews, is an attempt to shed the same sort of light 
on transmitter performance, and encourage manufacturers to do better. 
NEW! September 2014  http://k9yc.com/TXNoise.pdf


And a study of one of the worst six months later. Here is a preliminary 
in-progress report on my ongoing project to measure  the Occupied 
Spectrum  of various ham rigs. This second file includes some of the 
same data, but focuses on the FTDX5000  before and after implementation 
of the September 2014 firmware upgrade. For all of these measurements, 
both of the K3s in use had the original synthesizer board. Note that 
while these reports use Power Point because it's a good way to view the 
data, they are not intended for live presentation in their current 
preliminary form.   NEW! March 2015


 http://k9yc.com/FTDX5000_Report.pdf

73, Jim K9YC


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Re: [Elecraft] Where to put the wattmeter

[Steve L]

My eyes were recently opened in reviewing several Rob Sherwood NC0B 
presentations regarding the receiver testing he is famous for…. as the 
presentations really focused on transmitter cleanliness.  In the presentations, 
Rob argues we have many excellent receivers available to us today - and goes on 
to argue today’s transmitters are the problem  loading the bands with splatter, 
phase noise, key clicks and other undesirable artifacts, with Elecraft among 
the cleanest (and several other popular radios among the dirtiest).

Look up Rob on YouTube for several excellent presentations.

Steve
AA8AF



> On Apr 20, 2023, at 2:20 PM, Jim Brown  wrote:
> 
> On 4/20/2023 11:05 AM, Fred Jensen wrote:
>> I've just never found that the time-domain waveform was a very good 
>> indicator of signal quality.
> 
> RIGHT!
> 
> By far, the most sensitive (and the most meaningful) measure of transmit 
> distortion is occupied bandwidth, as measured on a spectrum display with 
> narrow resolution bandwidth and narrow display bandwidth, and that can 
> display and hold signal peaks. The P3 is quite good for this, and even better 
> with the SVGA module. For voice modes, the waterfall can be adjusted to 
> display splatter as horizontal expansion of the signal on voice peaks.
> 
> Elecraft rigs look great on such a display, straight vertical bars; 
> overdriven power amps and many recent model Yaesu rigs produce splatter about 
> 2.5 kHz both sides of their signal (those vertical bars), only 20 dB down 
> from PEP. That is, 2.5 kHz on both the suppressed carrier side, and 5.5 kHz 
> on the other side of the suppressed carrier.
> 
> 73, Jim K9YC

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