Re: [Elecraft] K3 Frequency Calibration

[David Hachadorian]

That Keuwlsoft Audio Frequency Counter is pretty cool!  Thanks for 
pointing it out.


I found the easiest way to use it is to put the K3 in reverse CW, tune 
to 10.00 MHz, and set REF CAL to a setting that "eyeball averages" 
best to your PITCH setting.  Even with the eyeball averaging, it is 
pretty obvious which REF CAL setting is best. Use reverse CW, because if 
you rotate REF CAL to the right, the pitch will increase, so it is more 
intuitive than normal CW.


I will use this as my go-to cal procedure.

Dave Hachadorian, K6LL
Yuma, AZ


On 12/19/2021 5:18 AM, Nate Bargmann wrote:

* On 2021 18 Dec 23:09 -0600, David Hachadorian wrote:

After exchanging emails with N4ZR, who started this thread, we think this is
the easiest procedure:

Tune the rig to 10.000 MHz in CW mode.  Listen to the tone of the WWV
carrier, which should be close to your CW PITCH setting.
Switch back and forth between reverse cw and normal cw, adjusting REF CAL
until the tones are equal in pitch on normal and reverse.

This procedure should get you calibrated well within 1 Hz, much better than
required for any amateur radio application that I can think of.

In addition, I installed the "Keuwlsoft Audio Frequency Counter" app on
my Android phone and set it next to the speaker.  Its display in Hertz
makes dialing in the reference calibration value quick and easy.  On my
K3 it shows about .5 Hz difference between Norm and Rev.  I certainly
cannot hear that!

73, Nate, N0NB


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Re: [Elecraft] K3 Frequency Calibration

[Joe Subich, W4TV]

I use WSJTX but not in its CAL mode.  Simply set the VFO for x.000 on
the highest frequency you can reliably hear WWV (10, 15, 20 or 25 MHz)
and "dial in" the audio tone (SSB or DATA A) to the proper 500/600 Hz
frequency using REF CAL.

I've stopped using the "toggle between USB/LSB or CW/CW_R" and match
the tone as it's far easier to set the trace on the waterfall -
particularly if one sets "bins per pixel" to 1.

73,

   ... Joe, W4TV


On 2021-12-19 12:04 AM, David Hachadorian wrote:
After exchanging emails with N4ZR, who started this thread, we think 
this is the easiest procedure:


Tune the rig to 10.000 MHz in CW mode.  Listen to the tone of the WWV 
carrier, which should be close to your CW PITCH setting.
Switch back and forth between reverse cw and normal cw, adjusting REF 
CAL until the tones are equal in pitch on normal and reverse.


This procedure should get you calibrated well within 1 Hz, much better 
than required for any amateur radio application that I can think of.


Dave Hachadorian, K6LL
Yuma, AZ


On 12/18/2021 2:39 PM, Bob McGraw wrote:
The method I use seems to work great and be easy enough to do. No zero 
beating required and no external measurements required.


Put the radio in CW mode, tune to a WWV frequency and press and 
release SPOT.  The radio will automatically zero to the carrier with a 
tone that matches your preferred CW note.  Then via the CONFIG MENU go 
to REF CAL and adjust up or down with the VFO A knob,  the number of 
Hz error the previous SPOT routine disclosed.   A 10 Hz change on the 
REF CAL will equate to about 2 Hz at 10 MHz.    I find that checking 
several different WWV frequencies is even better using this method. To 
make sure it is optimum, tune to 5 or 10 Hz above and below each of 
the WWV frequencies.  Press SPOT from both above and below and see how 
it resolves.   Usually I can get within 2 Hz or better on all of 
them.  You may need to do this several times.  Be sure the radio has 
been on for at least 1/2 hour to allow things to stabilize.


73

Bob, K4TAX



Message: 4
Date: Thu, 16 Dec 2021 18:46:59 -0500
From: Don Wilhelm
To: Pete Smith N4ZR, Elecraft List

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<81d4d693-6cd1-f11b-30b7-d4523ce74...@w3fpr.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

Pete,

When using WWV to set the K3 reference, make certain you are listening
to the carrier.? WWV is an AM signal that is modulated by a 500 or 600
Hz tone on alternate minutes (440 Hz 2 minutes after the hour).? That
produces tones that are both above and below the carrier.
So be certain you are hearing the carrier and not one of the modulating
tones.

73,
Don W3FPR

On 12/16/2021 4:34 PM, Pete Smith N4ZR wrote:

I've been wondering for some time if my 10-year-old K3's frequency
calibration was off, because it seemed like most spots of me were well
off when I clicked on them, usually in one direction.? Not having a
frequency counter, I went to the alternative method outlined in page
49 of the manual.? I thought I did it all "by the book", but found
that when I was done 15-MHz WWV's carrier frequency (determined by
zero-beating the carrier) was almost 400 Hz low. Since I wasn't
looking for FMT-level accuracy, I went back to WWV and adjusted the
REF CAL setting by ear until 15.000 on my RX dial was as close to
zero-beat with WWV as I could tell. We'll see how it worked out, but I
wonder if I simply have some fundamental misunderstanding of what's
involved.? Wouldn't be the first time...



--

Message: 5
Date: Thu, 16 Dec 2021 17:01:50 -0700
From: David Hachadorian
To: Pete Smith N4ZR, Reflector Elecraft

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<6453871f-7e7d-fa93-8a79-7b1efd5e4...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

You had it fixed, but then you broke it again. After doing the
alternative method on page 49, when you tune in to 10. MHz in CW
mode, you should hear a CW note at the same frequency as your PITCH
selection.? I presume that is 400 Hz.

I got an extremely good score on last year's Frequency Measuring Test
using only that alternative calibration method.

73

Dave Hachadorian, K6LL
Yuma, AZ



--

Message: 6
Date: Thu, 16 Dec 2021 23:04:36 -0800
From: Ray
To: Wes, "elecraft@mailman.qth.net"

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<61bc3686.1c69fb81.f8fd0.8...@mx.google.com>
Content-Type: text/plain; charset="utf-8"

Gents
Go to a WWV signal, (5.00)  on a Good Strong Frequency.
Place the Mode To Upper SSB, Listen to the Beat note Tone Freq,
Now Move the Mode to Lower SSB. Adjust the  Ref. Cal. Osc. until the 
Beat Note is the Exact Same Freq

On Lower SSB and Upper SSB.   Done
Ray WA6VAB  K3

___

Re: [Elecraft] K3 Frequency Calibration

[Nate Bargmann]

* On 2021 18 Dec 23:09 -0600, David Hachadorian wrote:
> After exchanging emails with N4ZR, who started this thread, we think this is
> the easiest procedure:
> 
> Tune the rig to 10.000 MHz in CW mode.  Listen to the tone of the WWV
> carrier, which should be close to your CW PITCH setting.
> Switch back and forth between reverse cw and normal cw, adjusting REF CAL
> until the tones are equal in pitch on normal and reverse.
> 
> This procedure should get you calibrated well within 1 Hz, much better than
> required for any amateur radio application that I can think of.

In addition, I installed the "Keuwlsoft Audio Frequency Counter" app on
my Android phone and set it next to the speaker.  Its display in Hertz
makes dialing in the reference calibration value quick and easy.  On my
K3 it shows about .5 Hz difference between Norm and Rev.  I certainly
cannot hear that!

73, Nate, N0NB

-- 
"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."
Web: https://www.n0nb.us
Projects: https://github.com/N0NB
GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819

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Re: [Elecraft] K3 Frequency Calibration

[David Hachadorian]

After exchanging emails with N4ZR, who started this thread, we think 
this is the easiest procedure:


Tune the rig to 10.000 MHz in CW mode.  Listen to the tone of the WWV 
carrier, which should be close to your CW PITCH setting.
Switch back and forth between reverse cw and normal cw, adjusting REF 
CAL until the tones are equal in pitch on normal and reverse.


This procedure should get you calibrated well within 1 Hz, much better 
than required for any amateur radio application that I can think of.


Dave Hachadorian, K6LL
Yuma, AZ


On 12/18/2021 2:39 PM, Bob McGraw wrote:
The method I use seems to work great and be easy enough to do. No zero 
beating required and no external measurements required.


Put the radio in CW mode, tune to a WWV frequency and press and 
release SPOT.  The radio will automatically zero to the carrier with a 
tone that matches your preferred CW note.  Then via the CONFIG MENU go 
to REF CAL and adjust up or down with the VFO A knob,  the number of 
Hz error the previous SPOT routine disclosed.   A 10 Hz change on the 
REF CAL will equate to about 2 Hz at 10 MHz.    I find that checking 
several different WWV frequencies is even better using this method.   
To make sure it is optimum, tune to 5 or 10 Hz above and below each of 
the WWV frequencies.  Press SPOT from both above and below and see how 
it resolves.   Usually I can get within 2 Hz or better on all of 
them.  You may need to do this several times.  Be sure the radio has 
been on for at least 1/2 hour to allow things to stabilize.


73

Bob, K4TAX



Message: 4
Date: Thu, 16 Dec 2021 18:46:59 -0500
From: Don Wilhelm
To: Pete Smith N4ZR, Elecraft List

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<81d4d693-6cd1-f11b-30b7-d4523ce74...@w3fpr.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

Pete,

When using WWV to set the K3 reference, make certain you are listening
to the carrier.? WWV is an AM signal that is modulated by a 500 or 600
Hz tone on alternate minutes (440 Hz 2 minutes after the hour).? That
produces tones that are both above and below the carrier.
So be certain you are hearing the carrier and not one of the modulating
tones.

73,
Don W3FPR

On 12/16/2021 4:34 PM, Pete Smith N4ZR wrote:

I've been wondering for some time if my 10-year-old K3's frequency
calibration was off, because it seemed like most spots of me were well
off when I clicked on them, usually in one direction.? Not having a
frequency counter, I went to the alternative method outlined in page
49 of the manual.? I thought I did it all "by the book", but found
that when I was done 15-MHz WWV's carrier frequency (determined by
zero-beating the carrier) was almost 400 Hz low. Since I wasn't
looking for FMT-level accuracy, I went back to WWV and adjusted the
REF CAL setting by ear until 15.000 on my RX dial was as close to
zero-beat with WWV as I could tell. We'll see how it worked out, but I
wonder if I simply have some fundamental misunderstanding of what's
involved.? Wouldn't be the first time...



--

Message: 5
Date: Thu, 16 Dec 2021 17:01:50 -0700
From: David Hachadorian
To: Pete Smith N4ZR, Reflector Elecraft

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<6453871f-7e7d-fa93-8a79-7b1efd5e4...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

You had it fixed, but then you broke it again. After doing the
alternative method on page 49, when you tune in to 10. MHz in CW
mode, you should hear a CW note at the same frequency as your PITCH
selection.? I presume that is 400 Hz.

I got an extremely good score on last year's Frequency Measuring Test
using only that alternative calibration method.

73

Dave Hachadorian, K6LL
Yuma, AZ



--

Message: 6
Date: Thu, 16 Dec 2021 23:04:36 -0800
From: Ray
To: Wes, "elecraft@mailman.qth.net"

Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<61bc3686.1c69fb81.f8fd0.8...@mx.google.com>
Content-Type: text/plain; charset="utf-8"

Gents
Go to a WWV signal, (5.00)  on a Good Strong Frequency.
Place the Mode To Upper SSB, Listen to the Beat note Tone Freq,
Now Move the Mode to Lower SSB. Adjust the  Ref. Cal. Osc. until the 
Beat Note is the Exact Same Freq

On Lower SSB and Upper SSB.   Done
Ray WA6VAB  K3





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This li

Re: [Elecraft] K3 Frequency Calibration

[Gary Johnson via Elecraft]


Not sure why nobody has mentioned using WSJT in frequency calibration mode. 
It’s the bottom selection in the Mode menu. Shows  your offset in Hz to about 5 
decimal places. Just pick from the list of standard freqs and away it goes. 
Then adjust the K3 ref frequency to walk it in. There are even guys doing 
long-term observations on Allen variance this way.

Gary Johnson NA6O  
g...@me.com
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Re: [Elecraft] K3 Frequency Calibration

[Fred Jensen]

I find that trying to match two beat notes when I can only hear one at a 
time to be hard, best I can do is maybe 10 - 15 Hz Hz depending on the 
frequency.


FWIW:  The Burdick Calibration Method [BCM] for the K3 is actually much 
easier to perform than has been suggested in this thread,it is 
incredibly accurate, and it works for me every time. A couple of 
possibly helpful hints:


1.  The WWV signal is somewhat complex.  In addition to the carrier and 
AM voice announcements, it transmits tones, 500 Hz and 600 Hz on some 
but not all alternate minutes, and 440 Hz as an hour marker.  
Additionally, a continuous time code in a slightly modified IRIG-H 
format is transmitted on a 100 Hz sub-carrier using both PWM and PM 
modulation.  The 500 and 600 Hz tones produce sidebands and it is very 
easy to attempt to zero beat one of those instead of the carrier, so 
choose the period :43 to :52 in each hour when there are no tones.


2.  Put the K3 into USB [or LSB], either will work fine.  Choose a time 
when at least one of the WWV frequencies is strong at your QTH.  Any WWV 
freq will work ... if you are OCD, 20 MHz may result in tiny 
improvements in calibration accuracy which you'll never notice in normal 
operation.


3.  Generally, wider DSP bandwidths will make the true zero beat more 
discernible so long as other adjacent signals are not present but it 
does depend on your hearing.


4.  Not all WWV frequencies are created equal.  If you have a P3, you 
can look at the spectrum of each of the signals.  For the 5, 10, and 15 
frequencies:  It appears these use 10 KW plate-modulated, transmitters, 
likely with Class C PA's and there is more distortion present than I 
expected from NIST/WWV. You can see the 100 Hz sub-carrier and the very 
close in sidebands from the IRIG-H time code, and the first sidebands of 
the 500/600 Hz tones.  Because of the distortion, the two 1st sidebands 
will be modulated by the 100 Hz sub-carrier and its sidebands.  You will 
also see the two sidebands from the 2nd harmonic of the tones at reduced 
level too, also modulated by the 100 Hz sub-carrier.  On 10 MHz, I can 
also see the 3rd harmonics of the tones clearly, and can sometimes make 
out the 4th.  It's a great demo of how to annoy your fellow hams with 
distortion in your transmitter. 😉


The 2.5 and 20 MHz signals use 2.5 KW transmitters that are apparently 
much more linear.  They exhibit the carrier, sub-carrier and its 
sidebands, and only the fundamental sideband of the tones.  This will 
help a little in finding exact zero-beat, however a strong overall WWV 
signal with minimal QSB is way more important.


5. Set your K3 for 1 Hz display resolution.  You may want to experiment 
between high and low counts/revolution of the knob, I find lower 
counts/rev works better but YMMV.  Don your headphones, AF gain up 
almost to the point of uncomfortable, set the freq display to exactly 
the WWV freq.  Then, tap MENU->CONFIG and tune VFO B to select the REF 
CAL menu entry.  The display will show a long number. Mine is 49.379682


6.  Now the fun part.  Carefully adjust VFO A to achieve zero beat.  V e 
r y  s l o w l y rock VFO A through zero beat. The tone will get too low 
to hear, and as you go thru ZB, the background noise will begin to 
"pulse", fast at first and then slower, until you can count the 
amplitude pulses, and then begin to speed back up as you move to the 
other side of ZB.  You want the point where the pulses are the furthest 
apart.  In my K3, I can get down to about 1 pulse/2 sec and then 
continuing one encoder step, it goes up to 1 pulse/sec.  True ZB is 
between those two encoder steps, I set mine to 1 pulse every 2 sec. Tap 
MENU, and call CQ on exactly the frequency of your choice.


You can switch between USB and LSB after you've found your ZB spot, it 
just inverts the process.  The whole BCM takes way longer to describe 
than to do.  I've run it a few times over the years and my K3 [S/N 642] 
has never varied more than about 4 Hz in that long Ref Cal number.


Ray wrote on 12/16/2021 11:04 PM:

Gents
Go to a WWV signal, (5.00)  on a Good Strong Frequency.
Place the Mode To Upper SSB, Listen to the Beat note Tone Freq,
Now Move the Mode to Lower SSB. Adjust the  Ref. Cal. Osc. until the Beat Note 
is the Exact Same Freq
On Lower SSB and Upper SSB.   Done
Ray WA6VAB  K3





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Re: [Elecraft] K3 Frequency Calibration

[Ray]

Gents
Go to a WWV signal, (5.00)  on a Good Strong Frequency.
Place the Mode To Upper SSB, Listen to the Beat note Tone Freq,
Now Move the Mode to Lower SSB. Adjust the  Ref. Cal. Osc. until the Beat Note 
is the Exact Same Freq
On Lower SSB and Upper SSB.   Done  
Ray WA6VAB  K3 


rom: Wes
Sent: Thursday, December 16, 2021 3:24 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Frequency Calibration

What are you using it for?

Wes  N7WS

On 12/16/2021 3:18 PM, John Stengrevics wrote:
> Hi Pete,
>
> The WWV method worked for me until it didn’t.  On the advice of one of the K3 
> gurus, I am now using a Leo Bodnar frequency source.  Works great.
>
> 73,
>
> John
> WA1EAZ
>
>> On Dec 16, 2021, at 4:34 PM, Pete Smith N4ZR  wrote:
>>
>> I've been wondering for some time if my 10-year-old K3's frequency 
>> calibration was off, because it seemed like most spots of me were well off 
>> when I clicked on them, usually in one direction.  Not having a frequency 
>> counter, I went to the alternative method outlined in page 49 of the manual. 
>>  I thought I did it all "by the book", but found that when I was done 15-MHz 
>> WWV's carrier frequency (determined by zero-beating the carrier) was almost 
>> 400 Hz low. Since I wasn't looking for FMT-level accuracy, I went back to 
>> WWV and adjusted the REF CAL setting by ear until 15.000 on my RX dial was 
>> as close to zero-beat with WWV as I could tell. We'll see how it worked out, 
>> but I wonder if I simply have some fundamental misunderstanding of what's 
>> involved.  Wouldn't be the first time...
>>
>> -- 
>> 73, Pete N4ZR
>> Check out the new Reverse Beacon Network
>> web server at <http://beta.reversebeacon.net>.
>> For spots, please use your favorite
>> "retail" DX cluster.
>>

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Re: [Elecraft] K3 Frequency Calibration

[David Hachadorian]

You had it fixed, but then you broke it again. After doing the 
alternative method on page 49, when you tune in to 10. MHz in CW 
mode, you should hear a CW note at the same frequency as your PITCH 
selection.  I presume that is 400 Hz.


I got an extremely good score on last year's Frequency Measuring Test 
using only that alternative calibration method.


73

Dave Hachadorian, K6LL
Yuma, AZ

On 12/16/2021 2:34 PM, Pete Smith N4ZR wrote:
I've been wondering for some time if my 10-year-old K3's frequency 
calibration was off, because it seemed like most spots of me were well 
off when I clicked on them, usually in one direction.  Not having a 
frequency counter, I went to the alternative method outlined in page 
49 of the manual.  I thought I did it all "by the book", but found 
that when I was done 15-MHz WWV's carrier frequency (determined by 
zero-beating the carrier) was almost 400 Hz low. Since I wasn't 
looking for FMT-level accuracy, I went back to WWV and adjusted the 
REF CAL setting by ear until 15.000 on my RX dial was as close to 
zero-beat with WWV as I could tell. We'll see how it worked out, but I 
wonder if I simply have some fundamental misunderstanding of what's 
involved.  Wouldn't be the first time...



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Re: [Elecraft] K3 Frequency Calibration

[Don Wilhelm]

Pete,

When using WWV to set the K3 reference, make certain you are listening 
to the carrier.  WWV is an AM signal that is modulated by a 500 or 600 
Hz tone on alternate minutes (440 Hz 2 minutes after the hour).  That 
produces tones that are both above and below the carrier.
So be certain you are hearing the carrier and not one of the modulating 
tones.


73,
Don W3FPR

On 12/16/2021 4:34 PM, Pete Smith N4ZR wrote:
I've been wondering for some time if my 10-year-old K3's frequency 
calibration was off, because it seemed like most spots of me were well 
off when I clicked on them, usually in one direction.  Not having a 
frequency counter, I went to the alternative method outlined in page 
49 of the manual.  I thought I did it all "by the book", but found 
that when I was done 15-MHz WWV's carrier frequency (determined by 
zero-beating the carrier) was almost 400 Hz low. Since I wasn't 
looking for FMT-level accuracy, I went back to WWV and adjusted the 
REF CAL setting by ear until 15.000 on my RX dial was as close to 
zero-beat with WWV as I could tell. We'll see how it worked out, but I 
wonder if I simply have some fundamental misunderstanding of what's 
involved.  Wouldn't be the first time...




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Re: [Elecraft] K3 Frequency Calibration

[Wes]

What are you using it for?

Wes  N7WS

On 12/16/2021 3:18 PM, John Stengrevics wrote:

Hi Pete,

The WWV method worked for me until it didn’t.  On the advice of one of the K3 
gurus, I am now using a Leo Bodnar frequency source.  Works great.

73,

John
WA1EAZ


On Dec 16, 2021, at 4:34 PM, Pete Smith N4ZR  wrote:

I've been wondering for some time if my 10-year-old K3's frequency calibration was off, 
because it seemed like most spots of me were well off when I clicked on them, usually in 
one direction.  Not having a frequency counter, I went to the alternative method outlined 
in page 49 of the manual.  I thought I did it all "by the book", but found that 
when I was done 15-MHz WWV's carrier frequency (determined by zero-beating the carrier) 
was almost 400 Hz low. Since I wasn't looking for FMT-level accuracy, I went back to WWV 
and adjusted the REF CAL setting by ear until 15.000 on my RX dial was as close to 
zero-beat with WWV as I could tell. We'll see how it worked out, but I wonder if I simply 
have some fundamental misunderstanding of what's involved.  Wouldn't be the first time...

--
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at .
For spots, please use your favorite
"retail" DX cluster.



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Re: [Elecraft] K3 Frequency Calibration

[John Stengrevics]

Hi Pete,

The WWV method worked for me until it didn’t.  On the advice of one of the K3 
gurus, I am now using a Leo Bodnar frequency source.  Works great.

73,

John
WA1EAZ

> On Dec 16, 2021, at 4:34 PM, Pete Smith N4ZR  wrote:
> 
> I've been wondering for some time if my 10-year-old K3's frequency 
> calibration was off, because it seemed like most spots of me were well off 
> when I clicked on them, usually in one direction.  Not having a frequency 
> counter, I went to the alternative method outlined in page 49 of the manual.  
> I thought I did it all "by the book", but found that when I was done 15-MHz 
> WWV's carrier frequency (determined by zero-beating the carrier) was almost 
> 400 Hz low. Since I wasn't looking for FMT-level accuracy, I went back to WWV 
> and adjusted the REF CAL setting by ear until 15.000 on my RX dial was as 
> close to zero-beat with WWV as I could tell. We'll see how it worked out, but 
> I wonder if I simply have some fundamental misunderstanding of what's 
> involved.  Wouldn't be the first time...
> 
> -- 
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at .
> For spots, please use your favorite
> "retail" DX cluster.
> 
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Re: [Elecraft] K3 Frequency Calibration vs the Reverse Beacon Network

[Don Wilhelm]

Pete,

I think you are assuming that the spot frequency is "dead on", and I 
would believe that is a bad assumption.  The other fellow's receiver may 
not be well calibrated.

If your K3 receives 15 MHz WWV at the right frequency, I would say your 
K3 is calibrated correctly.

73,
Don W3FPR

On 8/11/2012 8:45 AM, Pete Smith N4ZR wrote:
> I love my K3, but one thing puzzles me.  When I jump to a Reverse Beacon
> Network spot (on CW), the perceived audio tone of the station's CW is
> almost always higher than where I have my Pitch set, so in order to
> center the signal, I wind up tuning up-frequency perhaps 100-200 Hz.
> This is not altogether a bad thing, because it may move me out of the
> packet spot pileup, but it strikes me as odd.
>
>

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