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TOPIC: Ricalibrazione frequenza....

Ricalibrazione frequenza.... 04 May 2022 19:47 #1

  • Anto66
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Salve, qualcuno mi spiega come procedere con la calibrazione della frequenza? Sono andato sulla frequenza campione a 14996 Mhz e sono andato sulla voce Write ma l'Sdr non si è centrato. Nel software si può impostare anche manualmente lo scarto di frequenza ma non capisco quale valore inserire nell'immagine allegato visto che sono spostato di 16 Hz, grazie.
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Ricalibrazione frequenza.... 05 May 2022 10:53 #2

  • N8SDR
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Anto66 wrote:
Salve, qualcuno mi spiega come procedere con la calibrazione della frequenza? Sono andato sulla frequenza campione a 14996 Mhz e sono andato sulla voce Write ma l'Sdr non si è centrato. Nel software si può impostare anche manualmente lo scarto di frequenza ma non capisco quale valore inserire nell'immagine allegato visto che sono spostato di 16 Hz, grazie.

You must use a Calibrated Signal as a reference frequency!

or something like here stateside using WWV but only is signal is strong from them. you then adjust in small steps until it is zero beated
73 Rick
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Ricalibrazione frequenza.... 05 May 2022 17:28 #3

  • Anto66
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yes but how? how?
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Ricalibrazione frequenza.... 05 May 2022 18:17 #4

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If I go to the sample signal and center the signal at 14996 Mhz and save with WRHITE, I don't hear the changes !!! I am using eesdr 3.0
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Ricalibrazione frequenza.... 05 May 2022 22:54 #5

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Anto66 wrote:
If I go to the sample signal and center the signal at 14996 Mhz and save with WRHITE, I don't hear the changes !!! I am using eesdr 3.0

In a nutshell:

find a good true KNOW CALIBRATED SIGNAL and try to find something MID BANDS in this example I'll use WWV at 10MHZ

Place radio in AM MODE ( DO NOT USE SYSNCROUCHS AM)

Place radio on 10.000.00 MHz (DO NOT CHANGE THE RADIO FREQUENCY LEAVE IT SET AFTER YOU HAVE YOUR SORUCE)

Now listen to the tone adjust the frequency correction calibration numbers up or down till you find correct direction you need to go (Your listening for the ZERO BEAT) at first you may need to move in larger numbers say 0.000100 or 0.000200 0.000300 etc.

once you find which way gets you closer too the zero beat start adjusting in smaller steps like in tenths like say 0.000230

And go from there once you have it zero beat then click the WRITE and reboot radio and software and test again

as an example Mine ended up at 0.000112 the factory setting for mine was 0.000093 if I recall correctly

You need to use either AM or use UPPER then Lower to make sure you are centered on the zero beat, again DO NOT USE SYNCROUS AM MODE

If you use a frequency closer to the center of the bands, you should be closer calibrated through the spectrum of 160-6 Which is why I use 10.000.000 when I calibrate, which I haven't had to do in over a year.

Otherwise look into a reference oscillator and use the connection on back of radio
73 Rick
Last Edit: 05 May 2022 22:55 by N8SDR.
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Ricalibrazione frequenza.... 06 May 2022 05:12 #6

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thanks first of all, I can feel it at +16 Hz, setting that value (-0.000016) I DON'T feel it centered it's still out of frequency! I tried with other values ​​but nothing .... if instead I set on the main frequency +16 Hz (the one in the center of the software) the sdr remains centered .... it is as if the frequency is not orendesse correctly from the frequency coefficient, thank you
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Ricalibrazione frequenza.... 06 May 2022 13:14 #7

  • N8SDR
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Anto66 wrote:
thanks first of all, I can feel it at +16 Hz, setting that value (-0.000016) I DON'T feel it centered it's still out of frequency! I tried with other values ​​but nothing .... if instead I set on the main frequency +16 Hz (the one in the center of the software) the sdr remains centered .... it is as if the frequency is not orendesse correctly from the frequency coefficient, thank you

The correction Number is NOT THE SAME AS the OFFSET NUMBER:

Being off 16Khz is not the same as entering 0.000016

Infact 0.000016 I would say is a Very Low value: From what I have seen in adjusting others nearby me and my own

Typically the numbers in the 100ths from the Units I have helped or personally adjusted: Like I mentioned mine ended up at 0.000112

Again You do not adjust the actual Frequency leave that at the centered like in the example using WWV at 10.000.000 you want to enter that as the frequency and LEAVE IT that is what you are adjusting for if your moving that around your going to screw it up even more!

trying using 0.000116 and see what happens or -0.000116. personally, I haven't seen or adjusted any of the 2DX models that have had a negative number, but I suppose that could happen

as a quick test try this: 0.000130- then press write and listen and see if the frequency is now Negative or Positive from zero beat, and adjust up or down from there, in steps of 20 to get closer the closer you get the smaller the value of adjustment you should need to make, press write after each adjustment and listen and adjust again repeat until your satisfied. Press Write each time you make an adjustment and listen and watch the panadapter

Yes, it would be nice if it had an auto correction like in older PowerSDR that would get you close then you manually had to adjust from there, EESDR is manually all the way thru Rember to press WRITE after each adjustment

as a side note I would write down where you are now incase you need to revert to it at some point,
73 Rick
Last Edit: 06 May 2022 13:15 by N8SDR.
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Ricalibrazione frequenza.... 06 May 2022 13:53 #8

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that's why I can't center because the displacement number I have (+ 16Hz) DOES NOT coincide with the number to be entered in the CORRECTION FREQUENCY .... I'll try, thanks !!


the sample signal for a calibration of up I have to hear it continuously ????
Last Edit: 06 May 2022 14:15 by Anto66.
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Ricalibrazione frequenza.... 07 May 2022 00:18 #9

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Anto66 wrote:
that's why I can't center because the displacement number I have (+ 16Hz) DOES NOT coincide with the number to be entered in the CORRECTION FREQUENCY .... I'll try, thanks !!


the sample signal for a calibration of up I have to hear it continuously ????

YES you must listen to the frequency continuously to calibrate it:

You as I said cannot adjust the frequency while you are trying to calibrate, only adjust the number in the calibration field then press write and compare again, and continue until you have the calibration number producing a zero beat the frequency.
73 Rick
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Ricalibrazione frequenza.... 07 May 2022 11:38 #10

  • KD8CGH
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As I understand it, "zero beat" refers to two signals that are close in frequency. You hear the heterodyne "beat" as the difference between them. You can tune the frequencies to be the same by adjusting the beat to slow down to zero.
If you tune to the frequency of a time station like WWV in AM mode you can see the carrier in the waterfall but can not hear it as a tone. If you tune 1 kHz lower and use upper side band you will hear a tone at about 1 kHz. You can adjust the calibration by zooming the panadapter all the way in and adjusting the calibration value to center the peak seen to 1 kHz. A better way is to use the free fldigi program in frequency analysis mode and measure frequency in the fft display there.
In the US we can use WWV and the Canadian CHU. In Europe I think you can use RWM (Russia) at 9.996 MHz or 14.996 MHz or EBC (Spain, intermittent) at 15.006 MHz. You can web search for more info on them.
It is a good idea to let the rig warm up before calibrating.
73
Bob KD8CGH
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Ricalibrazione frequenza.... 07 May 2022 14:03 #11

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do not take the change in TX, only in reception! isn't it version 3.0 that has a bug ??
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Ricalibrazione frequenza.... 07 May 2022 14:45 #12

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Anto66 wrote:
do not take the change in TX, only in reception! isn't it version 3.0 that has a bug ??

Nope no issues with calibration in V3

What mode are you using , I suspect since you also say its off 16 that your using a Digital mode and You have No Set the Digu offset to 0 and left it at 1600

Just a wild guess!

Set offset to 0 in DigU modulator I suspect you left it at default

DIGUModulatorOffsetshouldbe0.jpg
73 Rick
Last Edit: 07 May 2022 14:49 by N8SDR.
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Ricalibrazione frequenza.... 07 May 2022 18:07 #13

  • Anto66
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oh wow !! I have never touched that voice !! I didn't know it was part of the calibration !! The other values ​​what should I insert???
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Ricalibrazione frequenza.... 07 May 2022 19:48 #14

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Anto66 wrote:
oh wow !! I have never touched that voice !! I didn't know it was part of the calibration !! The other values ​​what should I insert???

Its not part of calibration:

It is part of frequency offsets for Digu or Digl modes:

almost all DIGU modes use 0 offset
RTTY which is typically a DIGL mode has an offset

so I question just what mode your using in which you say your TX is off but RX isn't, to me that sounds like your using DigU and your not using a 0 offset

here watch and listen to Tylers video it should give you insight! to what I am referring too




make a video and link it of what your saying isnt correct:
73 Rick
Last Edit: 07 May 2022 19:53 by N8SDR.
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Ricalibrazione frequenza.... 07 May 2022 21:17 #15

  • Anto66
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nothing was at 0 offset, these are my default parameters
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