Re: DIGITAL FREQUENCY READOUT

Gordon Gibby <ggibby@...>
 

look in your software and see what frequency is set for the crystal.
use a script that puts the oscillator right on a known frequency (best to use the crystal frequency)
calculate how far off it is, calculte the real crystal frequency
adjust your software.

or use the calibration method specific to the firmware you have chosen, if you aren't able to do the above.

All mine have been 3-4 kilohertz off from the crystals "stated"' frequency. Putting in the correct constant for the effective true oscillation frequency of the crystal clock is a huge step toward having accurate frequencies. Then set your BFO if needed.

This is really a short-kit and you have to apply some of your "ham-smarts" to make things work correctly.
Because you studied and passed a ham radio license exam, you're one of the few people who are enabled to make such changes to your own amateur radio gear! Take advantage and develop your knowledge and skills!!!

Gordon


________________________________________
From: BITX20@groups.io <BITX20@groups.io> on behalf of Vince Vielhaber <vev@...>
Sent: Friday, November 9, 2018 2:55 PM
To: BITX20@groups.io
Subject: Re: [BITX20] DIGITAL FREQUENCY READOUT

To see the 25MHz xtal on mine I had to pull the display.

Vince.



On 11/09/2018 02:42 PM, Arv Evans wrote:
Bill W4NFR

The picture you provided is the back side of an Arduino Nano board. The
crystals on this PCB
have nothing to do with the transmitting frequency of your transceiver.
The SI5351a frequency
synthesizer is a small 10-pin MSOP IC, or 20-pin QFN IC. It should be
clearly labeled on the
top as an Si5351A device. Do you have a picture of the Raduino board
with its Si5351A chip
and crystal?

Arv K7HKL
_._


On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:

HERE IS A PHOTO OF BOARD AND CRYSTAL.

W4NFR

On 11/9/2018 9:57 AM, Mvs Sarma wrote:
OMG. acidentally crept in perhaps .
could you please share a photo please, !!!!!

regards
sarma
vu3zmv

On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH <w4nfr@...
<mailto:w4nfr@...>> wrote:

I OPENED UP MY uBITX AND TOOK A LOOK AT THE S1535A BOARD. THE
CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?

On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.hamskey.com_2018_05_frequency-2Dadjustment-2Dof-2Dubitx-2Dsi5351.html&d=DwICaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=mAUii3YaxPtywhZnzMLlmMvPiPtMo5OwMNFv6xTOoAo&s=Kc0Z75Apkcl8tA9B-xNE9Ip0f0Sgpei-_xfrvVKO9r0&e=


------------------------------------------------------------------------
AVG logo <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.avg.com_internet-2Dsecurity&d=DwICaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=mAUii3YaxPtywhZnzMLlmMvPiPtMo5OwMNFv6xTOoAo&s=6K1mVgDOZquT0Umhtr4HP-ThrOMYwjPKIsLmBo1l8G0&e=>

This email has been checked for viruses by AVG antivirus
software.
www.avg.com <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.avg.com_internet-2Dsecurity&d=DwICaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=mAUii3YaxPtywhZnzMLlmMvPiPtMo5OwMNFv6xTOoAo&s=6K1mVgDOZquT0Umhtr4HP-ThrOMYwjPKIsLmBo1l8G0&e=>


<#m_4175695945886965737_m_2844835715575407798_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
--
K8ZW https://urldefense.proofpoint.com/v2/url?u=http-3A__www.metalworkingfun.com&d=DwICaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=mAUii3YaxPtywhZnzMLlmMvPiPtMo5OwMNFv6xTOoAo&s=IDgedOO3B8-YG4hw7NNxr0wxmz03BtHDWm_utsVqy-M&e= https://urldefense.proofpoint.com/v2/url?u=http-3A__www.hamradio.fun&d=DwICaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=mAUii3YaxPtywhZnzMLlmMvPiPtMo5OwMNFv6xTOoAo&s=K12BpjbgtBoOSacLnf7IeEQTMo5Ptr6mMN0L6nAlw-g&e=

Join BITX20@groups.io to automatically receive all group messages.