Posted by
Lu Romero - W4LT on
Aug 12, 2010; 6:11pm
URL: http://elecraft.85.s1.nabble.com/P3-a-modest-proposal-for-QSY-tp5410950p5417256.html
So now I am getting a much better understanding...
What Joe W4TV is saying is that a P3 is "never more than 50
cycles" from the K3 frequency readout when correctly
calibrated. With a 100 cycle bandwidth, this is somewhat
acceptable.
However, on a Flex, I can click on a signal and be DEAD ON
the signal I have selected.
I have never operated a LP-Pan, but can I assume that it
will function just like the Flex (it is the same software
front end after all)?
And Skimmer's waterfall display is also just as accurate.
This means that if I am a "shoot fish in a barrel" mult
operator and are combing the band for signals, I would be
much more efficient time wise using a Flex/LP-Pan or a
Skimmer than using a P3 on my K3, even with the Macro Magic
CWT solution, right? The upside is that no computer is
needed (which is a non trivial thing, IMO).
Will/can the P3/K3 combination approach the accuracy of the
above systems?
-lu-w4lt-
Date: Thu, 12 Aug 2010 02:58:27 -0400
From: "Joe Subich, W4TV" <
[hidden email]>
Subject: Re: [Elecraft] P3: a modest proposal for QSY
To:
[hidden email]
Message-ID: <
[hidden email]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> You're wrong Brett... No matter what you say the P3
doesn't
> automatically sync with the K3 to a 1Hz accuracy. The
Center line
> on the P3 CAN be and usually is off by as much as 99Hz.
You're wrong. The P3 display will never be more than 50 Hz
from the
K3 if you calibrate it properly. Hold "center" until the
"Center
Frequency" adjust display comes on and then hold "Center"
again.
The P3 center frequency will be calibrated to the K3
frequency ...
the display will change +/- 50 Hz (e.g. it will show
10.000.0 from
9.999.950 to 10.000.049).
> Look, try this.. it's a very simple test. Take your rig,
put it on
> 10.000.000 Now look at your P3, does it say 10.000.0.
Let's say
> that it does (according to you it should), now, turn your
VFO knob
> up until the P3 reads 10.000.1. Where is your K3
displaying? I'm
> sure it's not going to be 10.000.100.
No, the P3 display will change to 10.000.1 at 10.000.050 as
I just
explained above. The P3 shows the correctly rounded version
(not
truncated) of the K3 frequency. If you want the P3 center
frequency
to align with the K3 simply do the "Center" "Center" process
as
documented in the manual.
> You just can't set the Ref-cal until you know the center
has been
> set correctly. If you do, than you're going to have
EVERYTHING out
> of wack by that much difference. Moving that Ref cal just
confuses
> things more.
If you properly zero the "Center" as instructed in the
manual and
use WWV or an AM broadcast signal with SPAN set to 2 KHz,
you will
get REF-CAL set to well less than 0.1 Hz ... probably on the
order
of 0.01 Hz. It's not rocket science ... just follow the
instructions
from those who designed the product and stop trying to
argue.
73,
... Joe, W4TV
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