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Raduino BFO hook up?

 

Group,

I was wondering if anyone has hooked up CLK0 for the BFO and if so, is it as easy as pulling the 12Mhz xtal and just feeding ~11.995 in?

Thank you

Mike WA3O?
 

Ashhar uses CLK0 for the BFO on the uBitx: ?http://www.phonestack.com/farhan/ubitx/ubitx.html

On Fri, Mar 31, 2017 at 05:28 am, Mike wrote:

I was wondering if anyone has hooked up CLK0 for the BFO and if so, is it as easy as pulling the 12Mhz xtal and just feeding ~11.995 in?

?
 

I did this and its working ok. You will need to adjust the USB/LSB frequency for your rig. Attached is a pic of how I attached CLK0 to the board.
 

Pete is using a piece of coax to go from P3 pin 8 of the Raduino over to T4 pin 6 of the main board. ?And of course, grounds on both ends of that piece of coax. ?Crystal X5 is removed to shut down the old BFO. ? The Raduino has a 0.1uF DC blocking cap, that cap is necessary if you are using some other source of 12mhz.

On the uBitx, Ashhar has a 4 resistor network to attenuate CLK0 from the Raduino where it drives the transformer, that may give better results. ?Ashhar is not one to add 4 extra parts where they are not needed.

Note that both Pete's Bitx40 and Ashhar's uBitx have the BAT54SL schottky dual diodes in the modulator, those with an older Bitx40 that is using two 1n4148's probably don't want Ashhar's attenuator.

Jerry, KE7ER



On Fri, Mar 31, 2017 at 07:37 am, peatmoss - ki6ssi wrote:

I did this and its working ok. You will need to adjust the USB/LSB frequency for your rig. Attached is a pic of how I attached CLK0 to the board.

?
 

Thanks for pointing that out Jerry. I'll have a look at that resistor network, I may have too much bfo signal.
 

run a coax from the raduino. there are ground pins around every clock output.

- f

On Fri, Mar 31, 2017 at 9:56 PM, peatmoss - ki6ssi <pete@...> wrote:
Thanks for pointing that out Jerry. I'll have a look at that resistor network, I may have too much bfo signal.


 

Pete,

Do you have any problems resulting from the level?

I have easy access to the top of the board so, instead of pulling the xtal I was going to cut the inductor (jumper wire) and feed it like Pete did? would this work as well?

Thanks

Mike WA3O?
 

Looks like cutting the jumper will work its in series with the xtal. My only issue is I lost some sensitivity and not sure if its because I switched my vfo to 19MHz or the bfo mod?

Ashhar, can you comment on what that resistor network is for on the ubitx? You have it in front of all the clocks. Some kind of impedance matching?
 

Did you remove C91 and 92?

73

Ken VA3ABN

On Fri, Mar 31, 2017 at 12:57 PM, peatmoss - ki6ssi <pete@...> wrote:

Looks like cutting the jumper will work its in series with the xtal. My only issue is I lost some sensitivity and not sure if its because I switched my vfo to 19MHz or the bfo mod?

Ashhar, can you comment on what that resistor network is for on the ubitx? You have it in front of all the clocks. Some kind of impedance matching?
 

Mike,
you could perhaps just remove R101 (or lift one leg - thumbstone it).
That would cut the supply voltage to the BFO and completely disable the
oscillator.

This would leave the analog BFO intact, so if you ever want to go back to
the original setup then you just need to reinstall R101.

73, Allard PE1NWL
 

Allard,

Excellent idea...I will remove the resistor!

Thank you!

MIke
 

Allard and all,

I removed R101 and connected my BFO as the Pete's picture and after some BFO adjustment I have my BFO supplied via CLK0 and I am am able to switch USB and LSB. My sensitivity seems fine and all CLK's are set at 2ma.

Thanks for all who helped!

73's

Mike WA3O
 

Does anyone know of Arduino code that works on a Arduino with an encoder that handles 10 MHZ and below (LSB) and above USB with the correct frequency readout? The Pa3fat code I am using works well below 10 MHZ but 20 meters I am at 9MHZ and tuning is backwards (when display shows going up in frequency.. Output is actually going down) which makes converting tuff!
 

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The sketch by Gene Marcus W3PM can be found in the group and does what you want.

?

v/r

Fred W4JLE

?

From: [email protected] [mailto:[email protected]] On Behalf Of Mike via Groups.Io
Sent: Sunday, April 2, 2017 7:53 AM
To: [email protected]
Subject: Re: [BITX20] Raduino BFO hook up?

?

Does anyone know of Arduino code that works on a Arduino with an encoder that handles 10 MHZ and below (LSB) and above USB with the correct frequency readout? The Pa3fat code I am using works well below 10 MHZ but 20 meters I am at 9MHZ and tuning is backwards (when display shows going up in frequency.. Output is actually going down) which makes converting tuff!

 

I seen that but I shy away because of the GPS correction . ..wonder if it can be disabled easily?


Thank you

Mike
 

开云体育

Yep. Simply // it out.

?

v/r

Fred W4JLE

?

From: [email protected] [mailto:[email protected]] On Behalf Of Mike via Groups.Io
Sent: Sunday, April 2, 2017 5:01 PM
To: [email protected]
Subject: Re: [BITX20] Raduino BFO hook up?

?

I seen that but I shy away because of the GPS correction . ..wonder if it can be disabled easily?

?

Thank you

Mike
 

OK Group,

I have W3PM's code working with some slight modifications to the software and hardware (I had to rewire The clocks and add a push button for band change).

Thanks to all that helped!

Mike WA3O

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