Tuning Rates and fine tune shift.

[David Walker-8]

I used to notice that when I was tuning in  1Khz steps my frequency used to always end up about 30khz or 50khz higher.  So from tuning say from 5050.00 to 7070.00 using the 1Khz tuning rate the fine tune frequency read at would be 7070.03 or 7070.05.

Anyway, I did the recalibration of my K2 using Wayne's calibration posted on Don Wilhelm's website this avo because my dial frequency was 70hz out and I wanted to get it more accurate.  

I've got the calibration within 20-30khz however NOW I've noticed my 1khz tuning rate begins and ends perfectly.  So tuning from 7050.00 to 7070.00 by readout now shows 7070.00.

I've never seen this discussed before. I assume that if the 1khz tuning rate creates fine tune shift this must be related to a calibration problem?

Dave VK2NA
(ex VK2ICQ)
SN 3222
Albury, Australia.
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[Don Wilhelm-2]

Dave,

>From my observations, if the lower order digits on the frequency display are
different than xxxx.00 when you switch to 1kHz tuning steps, those
undisplayed digits will stay the same as they were. - in other words, if you
were tuned to 7070.35 and go to the 1 kHz tuning the steps will be to
7071.35, 7072.35 etc.

Perhaps Wayne will chime in here with the 'real' answer.  I never paid a lot
of attention to it and just assumed it was like I said above.

73,
Don W3FPR

Life is what happens when you are making other plans

----- Original Message -----

I used to notice that when I was tuning in  1Khz steps my frequency used to
always end up about 30khz or 50khz higher.  So from tuning say from 5050.00
to 7070.00 using the 1Khz tuning rate the fine tune frequency read at would
be 7070.03 or 7070.05.

Anyway, I did the recalibration of my K2 using Wayne's calibration posted on
Don Wilhelm's website this avo because my dial frequency was 70hz out and I
wanted to get it more accurate.

I've got the calibration within 20-30khz however NOW I've noticed my 1khz
tuning rate begins and ends perfectly.  So tuning from 7050.00 to 7070.00 by
readout now shows 7070.00.

I've never seen this discussed before. I assume that if the 1khz tuning rate
creates fine tune shift this must be related to a calibration problem?



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[G3VVT]

Dave,
 
I can get my recent K2 built and calibrated about two months back to give  
the same change of the last digit on the full display (10Hz steps) when changing
 tuning steps (RATE). I had seen this pop up on odd occasions when going  
from different tuning rates, but could not pin down the mechanics of it.
 
Now seem to be able to duplicate the effect on a regular basis with the  
following steps:
 
1.    Set the display on 10Hz steps and zero  the last digit of the display.
2.    TAP the RATE button once to remove the last two  display digits and the
tuning rate to 1kHz steps.
3.    Turn the VFO at this 1kHz rate to another  setting.
4.    TAP the RATE button once to add the first of the  last two digits on
the display and the tuning rate to 100Hz steps.
5.    Turn the VFO at this 100Hz rate to another  setting.
6.    TAP the RATE button once to add the last digit of  the display and the
tuning rate to 10Hz steps. Find the last digit now reads 5  even though it was
left on zero.
 
There may be other ways of duplicating the effect though not stumbled on to  
those as yet. Seem to remember there was a discussion on what could be a  
similar topic about a month or two back in regard to exactly setting of the  BFO
or some other preset frequencies during calibration and it  was said to be
related to the resolution of the ADC in the K2.
 
 
Bob, G3VVT
K2 #4168
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[Rich Lentz]

In previous discussions on this reflector I have read that the 50  Hz change
when 100 Hz is selected is a "Design Feature."  If you listen very
carefully, or if you look at a display of WWV with Spectrogram or any PSK
display you will see that when you turn the knob very slowly that it
actually changes if 50 Hz steps but only shows 100 Hz increments.


Rich,
KE0X

--

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[Tom Arntzen]

I think this can be changed in secondary menu.

----- Original Message -----
From: <[hidden email]>
To: <[hidden email]>; <[hidden email]>
Sent: Monday, July 05, 2004 6:11 PM
Subject: Re: [Elecraft] Tuning Rates and fine tune shift.


> Dave,
>
> I can get my recent K2 built and calibrated about two months back to give
> the same change of the last digit on the full display (10Hz steps) when
changing
>  tuning steps (RATE). I had seen this pop up on odd occasions when going
> from different tuning rates, but could not pin down the mechanics of it.
>
> Now seem to be able to duplicate the effect on a regular basis with the
> following steps:
>
> 1.    Set the display on 10Hz steps and zero  the last digit of the
display.
> 2.    TAP the RATE button once to remove the last two  display digits and
the
> tuning rate to 1kHz steps.
> 3.    Turn the VFO at this 1kHz rate to another  setting.
> 4.    TAP the RATE button once to add the first of the  last two digits on
> the display and the tuning rate to 100Hz steps.
> 5.    Turn the VFO at this 100Hz rate to another  setting.
> 6.    TAP the RATE button once to add the last digit of  the display and
the
> tuning rate to 10Hz steps. Find the last digit now reads 5  even though it
was
> left on zero.
>
> There may be other ways of duplicating the effect though not stumbled on
to
> those as yet. Seem to remember there was a discussion on what could be a
> similar topic about a month or two back in regard to exactly setting of
the  BFO

> or some other preset frequencies during calibration and it  was said to be
> related to the resolution of the ADC in the K2.
>
>
> Bob, G3VVT
> K2 #4168
> _______________________________________________
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> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):

http://mailman.qth.net/mailman/listinfo/elecraft    Help:
http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>


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[G3VVT]

Rich,
 
Missed that cause somehow when trying to find the reason for the 50Hz  shift.
 
Can confirm that if in the 100Hz step position it is possible to slightly  
move the VFO without changing the display on that RATE selection, though does  
show up as a 50Hz shift when the 10Hz RATE selection is made. If a normal  
shift of the VFO is made on the "100Hz" step selection to a desired  frequency, it
is a matter of luck where the last 10Hz digit can end up.  Most times it
seemed to end up unchanged when tried originally.
 
The question will no doubt come up again in the future.
 
Bob, G3VVT
K2 #4168
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