K3 Reference Oscillator

[Ed White WA3BZT]

Hi Gang:
Need help insetting up the TCXO 1ppm oscillator.
I was trying to get Method 3 to work in setting up the oscillator.
I can get to the menu CONFIG:REF CAL but when I tap  1 I do not get EWF
xxC. I assume tap  1 is the #1 key on the key pad? Any help will be great.
Ed
WA3BZT
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[BigAlT]

Method 3 isn't implemented in firmware yet. Use Method 2.
 Al
 WB6HPF

Ed White WA3BZT wrote

Hi Gang:
Need help insetting up the TCXO 1ppm oscillator.
I was trying to get Method 3 to work in setting up the oscillator.
I can get to the menu CONFIG:REF CAL but when I tap  1 I do not get EWF
xxC. I assume tap  1 is the #1 key on the key pad? Any help will be great.
Ed
WA3BZT
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[Don Wilhelm-4]

Ed,

You errata sheet should tell you that Method 3 is not yet implemented.
Use Method 2 until the firmware includes Method 3.  You still have the
1ppm TCXO.  When implemented, Method 3 will allow you to do temperature
compensation that can produce a stability better than the 1ppm.

73,
Don W3FPR

Ed White WA3BZT wrote:
> Hi Gang:
> Need help insetting up the TCXO 1ppm oscillator.
> I was trying to get Method 3 to work in setting up the oscillator.
> I can get to the menu CONFIG:REF CAL but when I tap  1 I do not get
> EWF xxC. I assume tap  1 is the #1 key on the key pad? Any help will
> be great.
> Ed
> WA3BZT
>
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[Greg - AB7R]

Ed,

Please review your errata sheet that came with the radio.  The firmware is
not yet ready for this calibration method.

Tnx
Greg
AB7R
----- Original Message -----
From: "Ed White WA3BZT" <[hidden email]>
To: "K3 Elecraft" <[hidden email]>
Sent: Sunday, November 23, 2008 12:04 PM
Subject: [Elecraft] K3 Reference Oscillator

> Hi Gang:
> Need help insetting up the TCXO 1ppm oscillator.
> I was trying to get Method 3 to work in setting up the oscillator.
> I can get to the menu CONFIG:REF CAL but when I tap  1 I do not get EWF
> xxC. I assume tap  1 is the #1 key on the key pad? Any help will be great.
> Ed
> WA3BZT
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> 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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[gm3sek]

Greg Wrote:

>> Hi Gang:
>> Need help insetting up the TCXO 1ppm oscillator.
>> I was trying to get Method 3 to work in setting up the oscillator.
>> I can get to the menu CONFIG:REF CAL but when I tap  1 I do not get EWF
>> xxC. I assume tap  1 is the #1 key on the key pad? Any help will be great.
>> Ed
>> WA3BZT
>Ed,
>
>Please review your errata sheet that came with the radio.  The firmware
>is not yet ready for this calibration method.
>

For the record, here is another method for anyone who has an accurate
10MHz frequency standard and an oscilloscope with X-Y inputs.

1. Set up the 'scope to display a Lissajous pattern in its X-Y mode,
with sampled RF at 50MHz into the Y input and your 10MHz standard into
the X input.

2. Set the K3 to 50.000000MHz CW. Key down. You should see a slowly
rotating 5:1 Lissajous pattern.

(The pattern looks something like
http://www.math.com/students/wonders/lissajous/lissajous.html
with the following user settings:
xFreq = 10 000
yFreq = 50 001
hue Freq - any setting
Samples = 500 or more.
In this simulation, the offset between xFreq and yFreq gives a pattern
that goes through one complete evolution in about 20 seconds. Click
yFreq down to 50 000 to freeze the pattern at its current phase
difference; this corresponds to 'zero beat' between the two
frequencies.)

3. Use the VFO A knob to 'tune' the CONFIG: REF CAL setting until the
Lissajous pattern is rotating as slowly as possible. Using this visual
method you should be able to zero-beat the two frequencies much more
accurately than by ear  (Method 1). The practical limitation is the 1Hz
granularity in REF CAL settings.




--

73 from Ian GM3SEK
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[AC7AC]

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