[Elecraft] Data mode and filters

Sat May 9 02:23:58 EDT 2015

.

My "testing" was using CW mode only.

I do include a snapshot from the P3 pan-adapter when I send the person a
mail.

In all cases, the screenshot had signals that are stronger than the one I
question and did not show phase and Key Klick issues.  This is EXTREMELY
easy to find and point out with stations that run the CWT during the week.
There you can find a good number of signals that are over 1.4 kHz in width
and the jitter on the sidebands jumps out at you.

The strength of the signals are no greater than -65 dBm on the pan adapter.

What is interesting is that the stations in question had a Yaesu or Icom
listed or shown on their QRZ page.

Take a look at the upcoming CWT test this week.  The contest runs from 19:00
to 20;00 Zulu on May 13 and 03:00 to 04:00 Zulu on May 14.  You will see the
stations I am talking about, clear as day on your P3.

The CW part of Sweepstakes is also unreal.  There are stations that
deliberately run the rise times at < 5 mSec to make sure they have elbow
room.  People have used old Drake transmitters with modified waveform
shaping values (easy to find and change values) to make sure they are wide
(Key Klicks), and then use a K3 as their receiver.

BTW, David, I have not heard you on CW, and have no idea of your signal
quality.

Jim
W6AIM

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of David
Cole
Sent: Friday, May 8, 2015 7:13 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Data mode and filters

Hi Jim,

Honestly, my first question to you would be how is YOUR radio setup, and how
strong was my signal at your location? Are you overloading?  Were you
running with the Attenuator on, did you have AGC on, etc.

I have heard many, many people accuse another ham of being broad, when they
were just strong, not wide.

When I send out a report to another ham, about wide signals, I include a
snap shot from the P3, with a good signal at the same strength as the
offending signal.  That way the person knows that his/her signal is
different from a signal that is the same strength, on the same screen, at
the same time.  

That sort of ends all questions along the lines of the one above I listed.

I am a bit surprised some folks actually responded that they did not care...
Ham radio has changed a lot over the past 40 years...

--
Thanks and 73's,
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On Fri, 2015-05-08 at 15:09 -0700, jim wrote:
> I also agree with K4TV.
> 
> I did a little experiment concerning the "poor" signals that I have heard
on
> the bands.  I only looked at CW as that is my mode of choice.
> 
> When I "saw" a poor signal, I looked them up on QRZ.com and advised them
via
> e-mail, of their signal quality, and attached the two articles authored by
> K6XX and K9YC that show the various 
> popular radios currently on the market and their corresponding transmitted
> spectrum.  I also took a "snapshot" of the P3 display, showing their
signal
> which then could be  to the others on the pan-adaptor.  
> 
> My efforts to accomplish this took place during the CWT tests.   This mini
> contest lent itself to showing a significant number of different signals
at
> the same time.
> 
> I sent emails to nine different people this week.
> 
> Three (3) people did not responsed to my email
> Three (3) people came back to me stating they did not care at all about
> their transmitted sitnal
> Two (2) people were concerned/interested about their signal and was going
to
> further research the matter for the model number radio they had.
> One (1)person was going to send his radio back to the mfg'er for an
> update/mod and to change the mfg'er out out of box setting to 10
> milliseconds.
> 
> Difficult to draw any conclusions from this small sample size, but people
> with a wider xmit signal do have more **elnoww room**
> 
> Jim
> W6AIM
> 
> 
> .
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
James
> Wilson
> Sent: Friday, May 8, 2015 7:56 AM
> To: Elecraft
> Subject: [Elecraft] Data mode and filters
> 
> I have to agree with Joe, K4TV  in that use of super wide audio and
> over-driven amplifiers are in poor taste. Look at your P3, Some have
> considerable "other" sideband and run 10 to 12 KHz wide on congested
bands.
> 
> 73,
> 
> Jim W4RKS.
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