#ubitx Calibration resolution
#ubitx
Hello Ian
Where can I download v 1.03 of your software or the source to compile?
Another question I have, IF-Shift is working perfect in LSB-Mode but has =
no effect with USB-Mode. =3D Where should I have to look for, or ist =
this the momentary state?=20
Thanks for any information and 73, Gerald - HB9CEY
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Re: #ubitx Calibration resolution
#ubitx
Thanks Ian, that will help greatly. I figured I could do the calibration from the uBitx manager but didn't know what value to input there. I look forward to some detailed instructions on how to use the new features of the firmware and the uBitx manager. For the time being everything is working quite well.
Joel
N6ALT
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Re: #ubitx replaced Arduino Nano gives a lot of I2C interference during reception
#ubitx
John,
?I was seeing at different possibilities. ?Not i2c clicks alone. ?Thereby the FT-8 signalling on usb? cam eup as a thought. Try to power and ground returen wires as a pair, from some common point? instead of leaving gnd return indirect.There I suggested to have filter on the power wire.( like LC pi filter.). If the rotary encoder is externally wired? (i mean not? on board), you need to decouple the encoder pins to ground close at NANO. Also try to use s shielded (screened pairor tripple that includes the switch wire) for connecting rotary encoder. Perhaps you know all these tricks ,. already. regards ?sarma ?vu3zmv
On Thu, Feb 22, 2018 at 8:03 PM, John <passionfruit88@...> wrote: Alex,
I had the problem in reverse where the clicks where very noticeable with the factory nano as mounted on the Raduino.?
After? I changed the nano for a cheap eBay one, the clicks went away (as well as the audio tones I had).
This seems to indicate large variations in values of some components leading to part-to-parts variations.
Maybe better luck with the next one unfortunately.
All the best,
73, John (VK2ETA)
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Re: Erratic Tuning bitx40!
Can I update to a later software? If so what are the benefits of this? Thanks
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Re: Erratic Tuning bitx40!
Ok I will replace the pot. Thanks for the help guys.?
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Re: Variable power control
?Thanks -- great info.? 3db insertionloss.??
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There is an HP application note about PIN diode attenuators:?
I was just about to recommend a PIN diode attenuator as well. The device used in this particular configuration reached it's end of life, and may be hard to get soon. There are alternatives:?
The data sheet has a chart that shows insertion loss based on frequency and control voltage.?
--
Karl Heinz - K5KHK
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Re: Using external amp with ?Bitx
Measure the unmodified volume control with a volt meter. It there is DC present, then couple your audio through a 1-2Uf non polarized capacitor. DC on the audio input can "turn off" that external amp.? You want audio. Not audio on top of some DC level.
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Re: Variable power control
There is an HP application note about PIN diode attenuators:?
I was just about to recommend a PIN diode attenuator as well. The device used in this particular configuration reached it's end of life, and may be hard to get soon. There are alternatives:?
The data sheet has a chart that shows insertion loss based on frequency and control voltage.?
--
Karl Heinz - K5KHK
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Re: #ubitx replaced Arduino Nano gives a lot of I2C interference during reception
#ubitx
Alex,
I had the problem in reverse where the clicks where very noticeable with the factory nano as mounted on the Raduino.?
After? I changed the nano for a cheap eBay one, the clicks went away (as well as the audio tones I had).
This seems to indicate large variations in values of some components leading to part-to-parts variations.
Maybe better luck with the next one unfortunately.
All the best,
73, John (VK2ETA)
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Re: #ubitx replaced Arduino Nano gives a lot of I2C interference during reception
#ubitx
Hi Sarma,
Thanks for your answer, any help is welcome, and I'm sure I will finally find out what's happening. It's also the fun of building your own rig, hey?
Please note, I am not using the Raduino, but a standard Nano and an Adafruit SI5351 board. Neither do I use a rotary encoder but the old 'analog' method of tuning, where the rigs start running up and down at the tuning pot's ends.
Currently I am 'walking around' with the oscilloscope probe to get a 'feeling' about the signal. It's clear that the ground copper clad around the audio amp is not clean from noise. I just need to find out why it does work with the old Nano. The supply and ground leads around the Nano and SI5351 boards are clean. The tuning pot leads are clean also. I can reduce the clicks slighty by connecting a heavy screwdriver from the metal cabinet to ground close to the audio amp.
Better grounding will help, but it's strange that with the old Nano it works without any noise. I can't imagine that the broken IO port actually helps in this case.
I'm confused as to what you mean with the CH340 USB chip with FT8. USB is not connected during the tests. Firmware is uploaded to both Nano's and then USB is disconnected
73, Alex
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Re: Second batch of uBITX shipping?
#ubitx
I am planning on it. See you there, God willing and the creeks don't rise...
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Re: uBITx shipping and all
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Re: Variable power control
Thank you very much! I learned something from that. ?Do you have any idea what is the minimum insertion loss?
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I
want to suggest a circuit that I have tested to regulate the power in my previous self-built HF transmitter. It is based on an HSMP3816 QUAD PIN DIODE.
I
enclose the circuit file 73 IK6BLO
<ss.bmp>
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Re: #ubitx replaced Arduino Nano gives a lot of I2C interference during reception
#ubitx
Alex, I now understand that you had used co-ax cables to connect the clocks to main board.
?if the raduno is farhans original, why not try direct connection once with no cables. Secondly, I suppose (again I suppose) Farhan himself is using such Nanos only. Nothing vwery special. Hence can you please to clatrify whether these clicks could also be due to CH340 USB chip in case you use computer related FT-8 etc? ?If so original nano has to be? checkd for whether original NANO used CH340 or FT232RL or any other chip. Finally try to use a 1mH choke on the 12V dc line with proper filter. Also can you place 10nF? smd caps on the rotary encoder pins to ground. I suppose those clicks are due to encoder rotation. ?With these changes, perhaps the clicks can be minimized. Please don't feel that I am re-inventing the wheel, LoL regards sarma vu3zmv
On Thu, Feb 22, 2018 at 7:01 PM, Alex Buurlage <pa1fox@...> wrote: Hi all,
I have replaced the Nano in my homebrew rig as one of the IO ports was dead. Now, with the new Nano, same firmware, same rig, I have a lot of tuning clicks.?
When I disconnect the SI5351 the clicks are gone. When I disconnect the coax cables from the mainboard carrying the oscillator signals, clicks are nearly gone.
When I put back in the original Nano, clicks are hardly audible as it used to be until now.?
Has anyone found such differences in behaviour between cheap Nano boards from Ebay? Reviewing the method I2C works, I can't really imagine the big difference in behaviour as the output ports of the Nano seems to be open drain mosfets and the pull-up resistors at the SI5351 are the same.
Even with the volume pot completely down the clicks are very loud with the new Nano. One should think it is ground looping somewhere differently with this new Nano.
Any ideas?
73, Alex
PA1FOX
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#ubitx replaced Arduino Nano gives a lot of I2C interference during reception
#ubitx
Hi all,
I have replaced the Nano in my homebrew rig as one of the IO ports was dead. Now, with the new Nano, same firmware, same rig, I have a lot of tuning clicks.?
When I disconnect the SI5351 the clicks are gone. When I disconnect the coax cables from the mainboard carrying the oscillator signals, clicks are nearly gone.
When I put back in the original Nano, clicks are hardly audible as it used to be until now.?
Has anyone found such differences in behaviour between cheap Nano boards from Ebay? Reviewing the method I2C works, I can't really imagine the big difference in behaviour as the output ports of the Nano seems to be open drain mosfets and the pull-up resistors at the SI5351 are the same.
Even with the volume pot completely down the clicks are very loud with the new Nano. One should think it is ground looping somewhere differently with this new Nano.
Any ideas?
73, Alex
PA1FOX
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Re: Using external amp with ?Bitx
David - Thank you for pointing out that the top of the volume pot and wiper wires are reversed in the wireup diagram. I will try taking the audio from there.
Dexter - Yes, I have passed a ham exam. Only missed one question on the General. I have been building electronics for over 20 years, so I felt bad even having to ask a basic question like this one. Like I said in my earlier post, I've scratch built a single conversion Bitx with the same exact audio detector module with no issues.
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Re: Erratic Tuning bitx40!
You are right Allard,
The pot would have smoked! Pot smoking has happened before here..
M0clscarl, please replace your 10T pot and wire it right there sill be no problem.
Raj
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At 22/02/2018, you wrote: So you have a 10-turn pot?
Then it should indeed be wired as shown here:
On the purple wire (slider) the voltage should range from 0 - 5 Volts,
depending on the pot position.
73 Allard PE1NWL
On Thu, February 22, 2018 12:55, M0clscarl@... wrote:
I also noticed that the wiring for my tuning pot is different to the
online wiring guide. The tuning pot is a bourns (blue) pot so obviously
different to the guide, and this did work before so I assume this is
correct for this particular tuning pot. The purple wire goes to the
outermost pin, the yellow to the middle and the green to the innermost
pin. The cap is soldered over the yellow and purple.
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Re: Erratic Tuning bitx40!
So you have a 10-turn pot?
Then it should indeed be wired as shown here:
On the purple wire (slider) the voltage should range from 0 - 5 Volts,
depending on the pot position.
73 Allard PE1NWL
toggle quoted message
Show quoted text
On Thu, February 22, 2018 12:55, M0clscarl@... wrote: I also noticed that the wiring for my tuning pot is different to the
online wiring guide. The tuning pot is a bourns (blue) pot so obviously
different to the guide, and this did work before so I assume this is
correct for this particular tuning pot. The purple wire goes to the
outermost pin, the yellow to the middle and the green to the innermost
pin. The cap is soldered over the yellow and purple.
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Re: Using external amp with ?Bitx
Davis, you are absolutely right! According to this diagram the wires
are
interchanged.. the yellow should be pot TOP and ORANGE is pot middle.
That explains the crappy sound at low volumes.. never noticed!
Thanks!
Raj
At 22/02/2018, you wrote:
Raj / Richie
That's odd, the orange wire on my Ubitx is the input to the audio amp,
the wire colours and positions on the socket is the same as in the
wire-up but the orange wire definitely goes to the TDA2822 pin 7, there's
also a C78 connected to pin 7 that's not on the schematic.? The
(full) audio feed is on the yellow wire, an oscilloscope confirms this.
The orange wire need a DC path to ground for the TDA2822 to function
correctly.? It seems there's an error on the wire-up
drawing.
Regards
Davis S? G8DJM
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Re: Erratic Tuning bitx40!
And when fully clockwise what do you read? If not near 5 volts, then trace that lug back to the source. If you do find 5 volts and the center (wiper) pin is still zero then replace that control. Any linear control from 1 K to 50 K will work. 10K is what it came with. You are running the original native software apparently.
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Joel Caulkins/N6ALT
Raj vu2zap
Allard PE1NWL
Don, ND6T