Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

Arv Evans
 

Not 100% sure but popular thinking indicates the "crystals" on smaller Arduino boards are actually ceramic resonators.  If this is true then it should be possible to use capacitence to pull them further than would be possible with a real crystal.  This also lends credibility to the caution about possibile need to change AVR internal oscilator capacitence if changing resonator or crystal device.

Recently i purchased some Arduino Pro-mini units that have a standard crystal for the CPU clock.  These are for a frequency counter project where the stability of a crystal is needed.  Search Ebay for "arduino pro mini crystal" for these units.  

The Pro-minii Arduino are also interesting because they do not include built-in USB and thus there is no 12 MHz crystal to interfere with the BITX 12 MHz IF.

Arv. K7HKL
_-_


Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: James Lawrie <lawriejk@...>
Date: 2/3/18 11:15 PM (GMT-07:00)
To: BITX20@groups.io
Subject: Re: [BITX20] #ubitx-help Strong Audio Tones in and outside audio receive passband

I know I'm late to this party but you cannot swap crystals on nano board without first using a atmel programmer to burn the fuse bits that tell what freq it will be using or you will brick your nano.... also if the ftdi or whatever usb chip is using 12mhz, you could get the sparkfunPro 16mhz/8mhz board that does not use usb but instead uses usb to serial cable to upload. Be warned 16mhz board is 5 volt and 8 mhz is 3.3 volt.

I only use the Sparkfun Pro 16 for my projects. Another note if you go with the ATMega32U4 boards they have built in usb....

Maybe this will help someone or maybe not....

James Lawrie

Sent from my Galaxy Tab A

-------- Original message --------
From: Arv Evans <arvid.evans@...>
Date: 2/3/18 09:38 (GMT-06:00)
To: BITX20@groups.io
Subject: Re: [BITX20] #ubitx-help Strong Audio Tones in and outside audio receive passband

Jerry

Interesting observation that the 12 MHz USB clock oscillator is on nearly the same frequency
as the uBITX IF and BFO.  If the BFO is offset to the high side of the IF passband it could well
be within audio range of the USB clock frequency.  If this is the problem then it might be possible
to pull the USB clock crystal down with a small parallel capacitor.  That should not make a
significant change in USB clock timing but could take it out of range of the receiver IF and BFO
frequencies.  Some experimenting is probably necessary to tell how far to pull the crystal.  It
would not be good to accidentally put it within the IF filter passband.

Arv  K7HKL
_._


On Sat, Feb 3, 2018 at 1:47 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
I assume you mean changing the Arduino crystal, not cap.

The 16mhz ATMega328P crystal is about 3mm x 1.5mm, goes to  ATMega328p pins 7 and 8.
It is on the top of the Nano, just above the silk for edge pin D5.
Seeing the actual crystal now, and not just looking at datasheets and schematics, I see that it is
extremely small.   I doubt most of those with uBitx in hand will want to mess with it.

I bought some spare Nano clones, I believe they're identical to what's on the Raduino.
Mine have a CH340G chip on the back of the Nano for the USB interface.
This chip has another 3mm x 1.5mm crystal nearby, this one happens to be 12mhz.
    http://www.datasheet5.com/pdf-local-2195953

Quite possibly it is the 12mhz oscillator for the USB interface that is causing the trouble in at least some cases.
Though in post 40432 it was reported that a finger on the Nano's crystal caused the tones to vary,
which suggests that case was due to the 16mhz crystal since the 12mhz crystal is not usually accessible.

None of this was ever a problem on the Bitx40v3, far as I know.
I'd like to think there will be a simple fix, perhaps soldering in a bit of copper tape somewhere for shielding,
or adding a few caps.    Moving the IF would be pretty disruptive.

Jerry



On Fri, Feb 2, 2018 at 11:55 pm, Ashhar Farhan wrote:
changing the arudino cap is going to be a challenge as the arduino is soldered and you need to access it from the underside to desolder it. we had to resort to solder it in as keep it on a socket was leading to bulge and an additional failure point on the board.
 


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