Hello Folks,
i bought an BITX40 v3 from?. I don't have any folks that can send signal with good quality transceiver to calibrate my bitx.
I have an oscilloscope with frequency meter, and what I'm trying to do is to calibrate VFO and BFO (Mod from?) to proper frequencies.
Please, provide me an information how can I do that operation properly, if I can do it at all.
Regards,
?ukasz SP7WKY
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Pic. a bit out of focus but possible to fit coax cable to the connector.?? Crimp the terminals by hand and solder as well. Advantage also that you can unplug the cable if you need to remove the PCB. 
On Tue, Jul 31, 2018 at 02:10 PM, Nick VK4PLN wrote:
Great idea,
Do you think it makes a difference??
How about using coax instead for the normal wires?
Cheers
Nick, VK4PLN
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Re: uBITx V3 Stuck in Transmit
#ubitx
When you plug back the top connector the resistance should not change.
Since the resistance is changing it means your key jack wiring is the problem.
If you wired a stereo socket for a paddle and plugged in a mono plug then
you will be shorting the middle connection.. and keying up the TX.
For RX the key line must have 5V through the 4.7K.. if the voltage drops
then the Nano will key up the TX.
Check!
Raj
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At 31-07-18, you wrote: The plug on top of the Raduino.
--
Kind Regards
Rodger - ZL1RAH
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Re: uBITx V3 Stuck in Transmit
#ubitx
The plug on top of the Raduino.
--
Kind Regards
Rodger - ZL1RAH
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Re: uBITx V3 Stuck in Transmit
#ubitx
Rodger,
Which is the "digital plug" that you pulled off ?
Raj
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At 31-07-18, you wrote: Hi Raj
I checked for a short. When I pull the digital plug off and measure resistance between the blue and green wires, there is 4k7 there. When I plug it back into the digital port, the resistance is very small.(1k18)
I'm not sure if there is something funny with that raduino board, but maybe. I have nothing to compare it to. Thanks for the help.
--
Kind Regards
Rodger - ZL1RAH
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Anyone with a Raduino for the uBITX version3 for sale?
Hello all
How can I get a new raduino for my uBITX version 3. I'm almost sure the one I received from India is stuffed and I don't think they sell it separately.
Perhaps Ashhar Farhan, VU2ESE can let me now things to test on the board.
The condition is it has the 4k7 resister across the blue and green digital connection, but it goes into CW TX as soon as it's booted. I've tried removing the raduino from the radio and it's the same condition. Tried reloading the sketch, same issue.
Any help will be much appreciated.
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Kind Regards
Rodger - ZL1RAH
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Re: uBITx V3 Stuck in Transmit
#ubitx
Hi Raj
I checked for a short. When I pull the digital plug off and measure resistance between the blue and green wires, there is 4k7 there. When I plug it back into the digital port, the resistance is very small.(1k18)
I'm not sure if there is something funny with that raduino board, but maybe. I have nothing to compare it to. Thanks for the help.
--
Kind Regards
Rodger - ZL1RAH
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Re: CW keyer issues#ubitxcw
Mike you need to remove the 4.7K resistor from the tip and connect it to the blue wire. That will st your jack up for paddle operation. The 4.7k resistor set the keyer pin high which keeps it in receive. This input is an analog input that looks for variations in voltage to set different states, receive, transmit, TX dits, or TX dahs.
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On Jul 30, 2018, at 23:08, Mike Short < ai4ns.mike@...> wrote: I am having issues with the keyer.? I will only use paddles for CW. Tip is dit, I connected the 2.2k to it. The middle contact is dah, connected the 10k to it. Other ends of the resistors are soldered together with the blue wire. The 4.7k is connected to the dit, and them to the green. What did I do wrong? I only get dahs,?
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Mike
AI4NS
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Re: Spurious RF at beginning of CW transmission in the uBitx
Raj had a nice simple fix for the carrier burst on the Bitx40, might be applicable to the uBitx:?? ? ?? /g/BITX20/message/33707? ?? /g/BITX20/message/33742As I recall, there were a half dozen other fixes that worked. We've already mentioned delays in software as Allard has done for the Bitx40.
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I thought of that, but I don't have a Molex crimper,? and it would be more work in my opinion.?
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Mike
AI4NS
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Great idea,
Do you think it makes a difference??
How about using coax instead for the normal wires?
Cheers
Nick, VK4PLN
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How does the Nextion display look in bright light, or the sunlight.
73
Ken VA3ABN
Hi Al
A few of us have the ubitx and bitx40. We had quite few people at the meeting, which is odd for the summer months. Anyways we have a few teens joining and decided we could do something they could use. In the next month we'll be coming with a plan and we do have a resident software guy.
Next buildathon news to come.
73 Ken
On Mon, Jul 30, 2018, 9:36 AM Al Duncan VE3RRD < ve3rrd@...> wrote: Hi Ken, our little builder group in Barrie has been focusing on the uBitx and the amazing firmware from Ian KD8CEC . A number of us also have the Bitx40 which works very well with the Allard PE1NWL firmware .
73, AL? VE3RRD
On Sun, Jul 29, 2018 at 08:09 PM, Ken wrote:
Thanks all for the input.
?
Al Duncan, we're thinking of a transceiver for the next buildathon. Last Wednesday's meeting we asked for ideas. Transceiver sounds like what people want. I suggested the Nextion display for something a little fancier.
?
73
?
Ken VA3ABN
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I added an SMA connector instead of the existing connector. Should help with stray RF.
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Mike
AI4NS
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Re: Gamma-matching antenna tuner
Ah, correction:
I saw somewhere that spurious emission OF UBITX is at the level of -45dB toward the fundamental frequency.// hiro
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Christopher,
I saw somewhere that spurious emission is at the level of -45dB toward the fundamental frequency.
However, Japan¡¯s latest spurious regulation requires more than -50dB and so I started thinking about pi-match tuner or BPF.
This doesn¡¯t mean that uBitx doesn¡¯t suppress good enough spur but it just means that Japan¡¯s regulation is a little tight, I suppose.
// hiro, JJ1FXF
Would they not just need band pass filters for whatever the desired band is? I kind of see where you might be able to suppress spurious emissions in a tuner, but why? My limited understanding is that the ubitx has filters for hf bands 20 meters and lower. Do they not provide enough suppression?? If not a filter should be pretty straight forward to construct. No?
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I am having issues with the keyer.? I will only use paddles for CW. Tip is dit, I connected the 2.2k to it. The middle contact is dah, connected the 10k to it. Other ends of the resistors are soldered together with the blue wire. The 4.7k is connected to the dit, and them to the green. What did I do wrong? I only get dahs,?
--
Mike
AI4NS
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Re: Gamma-matching antenna tuner
Christopher,
I saw somewhere that spurious emission is at the level of -45dB toward the fundamental frequency.
However, Japan¡¯s latest spurious regulation requires more than -50dB and so I started thinking about pi-match tuner or BPF.
This doesn¡¯t mean that uBitx doesn¡¯t suppress good enough spur but it just means that Japan¡¯s regulation is a little tight, I suppose.
// hiro, JJ1FXF
toggle quoted message
Show quoted text
Would they not just need band pass filters for whatever the desired band is? I kind of see where you might be able to suppress spurious emissions in a tuner, but why? My limited understanding is that the ubitx has filters for hf bands 20 meters and lower. Do they not provide enough suppression?? If not a filter should be pretty straight forward to construct. No?
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Re: End Fed antennas w/ uBITX
#ubitx
John,
Two ways.... peel away the goop and see.? the 1:1 is obvious.
The 1:9 if its really 1:9 put a 450ohm resistor (a 470 will do in a pinch) from the output terminal
to the coax ground with short leads.? The use an antenna analyser if its 1:9 then he reflected
SWR will be 1:1 or ver very close.
The inductance can only tell you the number of turns of the trifilar bundle.? To get that you need
the ferrite type and size and use one of the kits and parts calculators for that ferrite and do it by trial.
IF expect between 6 and 9 turns of the triple wires.
Did you look at the ERACHI End fed kit manual posted earlier today? it makes that 1:9 transformer.
Allison
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Re: End Fed antennas w/ uBITX
#ubitx
Hi Allison, I have been looking at how 9:1 are wound and most of them look like the example you shared, except for one and it kinda matches what I have. I have a twisted trifilar 4 wraps transformer but it's smaller than the example I found at -??I am including a picture, the one on the left is the new 9:1, and the right is the 1:1. And the inductance I didn't measure before is 197uH between posts on the 9:1. Is there an old school way to determine rf impedance with these measurements or does that require specific test equipment? Or am I fussing too much about something that's probably fine anyway? It's new territory. 
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Re: End Fed antennas w/ uBITX
#ubitx
Chuck,
Right on point.? You nicely summarized methods and process of antenna development
in an?antenna engineering firm I worked for.
Use case, establish what you need the antenna to do.? ?Also try to not succumb
to excess added features.? ?The other side of that is no antenna need be forever,
so try different things to meet the need. That includes ways to easily to raise and
lower antennas.
Design/build/evaluate/modify process is a well known engineering procedure
to developing a functional product.? To that I add conceive and evaluate candidates
as that is where the process is process started.? Its research, look at antennas and?
try to understand what they can do in a specific case.? ?Not all candidates pass
muster but one may be the diamond.? ?Also failures can evolve to be the niche
solution rather than the general.
Simplicity,?within the bounds of fitness for the design purpose.??
Always keep in mind the goal.? ?And if all else fails, KISS, then build it well.
All to often antennas are a target of magic thinking or outrageous claims.?
Substance is measurable, construction quality, material quality, applicability
and frugality.? The latter is not "is it cheap" but "is it a good value".
Allison
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I got some time to build up the power managememt, Si5351 and LCD sections.? Updates are posted to: www.w3jdr.com
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Raj vu2zap
Skip Davis
Nick VK4PP
