Date   

Re: Installing nextion 3.2P

Gerard
 

Hello,

Some pb's with my home made PCB µBitx. LOL

1) When I test the frequency encoder potientiometer, I have the impression that it does not follow correctly.
If I am on the step of 50htz for example, by turning the encoder it can jump from 100Htz and more instead of 50. It does the same thing on your µBitx. I had other encoders, I change it, it’s the same.
Everything is well wired and the signals are good at the oscillo.
An idea?

2)another very strange phenomenon!!
When I go into the LCD option for intensity. I have to always be 100%. If I touch the setting, a sound (low frequency ) is heard and it varies in frequency linearly if we go from 99 to 0%.!!!!!!!

3)
When I use Spectrum analyser, there is always a 7.5 khz frequency that comes from the µBitx. It never changes any settings.

4) For your information, here the list of options that i have with the yellow menu:
band select,Select VFO B,Select Mode, RIT on?,IF shift on?,ATT on?,CW: 12WPM change?,Split on?,VFO to channel?,Channel to VFO?,Memory Keyer,WSPR Beacon,SDR mode on?,Setup OFF?,Exit Menu, Set Calibration?,Set the BFO,Set CW RX BFO,Change CW Tone,CW TX->RX Delay,CW Start Delay,Change Key Type?,TX OFF,Exit menu.
I think it’s complete, here the encoder seems to display all the options. Thank you for confirming me.

Another thing, I saw that you align your µbitx with WWC radio. I don’t think I have a transmitter of this type in France. How to do it then.
Last point, I checked everything on my PCB, welding, short circuit possible, value of components. Nothing abnormal.
He saved a lot of work.
Thank's for your help.
Cdt


Re: Raduino 4 Line Single Sided PCB boards

Evan Hand
 

Adrian,
I would recommend sending a private message to Rahul.

I would also recommend that you direct your post to an individual, or at least be more specific as to what you are asking.  Gordon's reply was for the original HF Signals boards that are not open source.  I believe that you are asking about the board designed by Rahul VU3WJM.

Just suggestions on my part.

Welcome to the group!
73
Evan
AC9TU


Re: No ssb out in ubitx v3 #ubitx #v3 #power

Evan Hand
 

Nikhil B,
Did you try CW?  That would isolate it to the power amp if no power in that mode.

Here is a PDF with static dc voltages for the uBITX.

NOTE: You do need to press the PTT to go into TX mode to take the TX voltages.  Be sure to have a dummy load or tuned antenna when doing those tests.

73
Evan
AC9TU


Re: Raduino 4 Line Single Sided PCB boards

Gordon Gibby
 

I don't think the company prefers to give away its intellectual property however several folks (including me) have created pcb's that control the si5351 chip and include the raduino and could do that job easily.
for example consider the files at:    https://www.qsl.net/nf4rc/Tech/BeginningSWRBoardFinalV11.dip

That board was intended to be usable as either a raduino or as an SWR system (the latter never really worked very well)   
Gordon


On Sun, Sep 6, 2020 at 6:21 AM Adrian Stokes via groups.io <kerravon=blueyonder.co.uk@groups.io> wrote:
new to this group where can i find the gerbers for this board.


Re: Raduino 4 Line Single Sided PCB boards

Adrian Stokes
 

new to this group where can i find the gerbers for this board.


Re: Yaesu MH-31 mic works great!

Erwin - PE3ES - F4VTQ
 

Could you post a connection diagram please Chris.
--
PE3ES - F4VTQ - Erwin
73


Re: No ssb out in ubitx v3 #ubitx #v3 #power

 

Does the RX work ?

If that is Ok then start with D1/2/5 Q20/21/22 and Q40/41/42. Check transistor voltages
and diodes for dry solder. It could also be the interstage toroids if RX is poor.

Raj

At 06/09/2020, you wrote:
When i keep my other SSB reciver in the room and talk, i can hear my voice on that receiver. But watt meter show no power. What is the problem? Which part do i need to check?


Re: No ssb out in ubitx v3 #ubitx #v3 #power

Nikhil B
 

BTW when i say no power i mean zero power (no means to measure miliwatts).

With my limited knowledge i think, SSB signal is generated, converted to RF signal but that RF signal is not getting amplified to give more power.

As CW is giving 5watts, final IRF must be ok. Problem lies somwhere in between.


Re: No ssb out in ubitx v3 #ubitx #v3 #power

Nikhil B
 

Thanks Evan for prompt reply, but i dont think mic drive is an issue here because with the same setup earlier it was pushing 5 to 7 watts on ssb.
Then it was sitting idle for 5-6 months away from any RF source. Now when i power it on with same setup, no SSB.
Wattmeter i am using is sensitive for low 1watt.
I tried long Helooooowwww, no power.


Re: uBitX V6 no transmit power #ubitxv6 #ubitx-help #tx

Evan Hand
 

Measure DC voltage from each of the three leads of the SMD transistor (collector, base, emitter) to Ground or common on the uBITX.  Here is the pinout of the transistor.   


The wiring is per the SOT-23 pinout.

This must be done while the uBITX is transmitting.  That can be CW or SSB.  SSB is better, as with no audio on the mic there is very little RF to interfere with the DC measurements.

The expected voltages are in the PDF document in this message:
https://groups.io/g/BITX20/message/81762

73
Evan
AC9TU



Re: UBITX Ver6 Salvaging the Baofeng microphone for more SSB RF output power!

Jeff Debes
 

There has been at least two issues with the Baofeng mics:
1) Weaker than nominal modulation
2) A high failure rate
See other posts on this .




On Sep 5, 2020, at 11:21 PM, ohwenzelph via groups.io <Ohwenzelph@...> wrote:

Hi Rob,
I am not clear on what is going on here, is this the mike that comes with the uBitxV6? or some other Baofeng mic that you picked up to use? And you are just removing whatever surface mount resistor that you find inside so that the electret element inside gets fed with a higher voltage? Seems a little ill defined and vague, but seems you are having success. Are the internal workings of the supplied mics somewhat variable?
thanks
jer aa1of

--
jeff.debes@...


Re: UBITX Ver6 Salvaging the Baofeng microphone for more SSB RF output power!

ohwenzelph
 

Hi Rob,
I am not clear on what is going on here, is this the mike that comes with the uBitxV6? or some other Baofeng mic that you picked up to use? And you are just removing whatever surface mount resistor that you find inside so that the electret element inside gets fed with a higher voltage? Seems a little ill defined and vague, but seems you are having success. Are the internal workings of the supplied mics somewhat variable?
thanks
jer aa1of


Re: uBitX V6 no transmit power #ubitxv6 #ubitx-help #tx

Aaron K5ATG
 

Evan you asked;
Did you get a chance to measure the 3 leads of Q90?
What measurements do you want me to make to Q90
--
'72
Aaron Scott
QRPARCI# 16443
GQRP# 16389
4SQRP # 1080


Re: UBITX Ver6 Salvaging the Baofeng microphone for more SSB RF output power!

robert pohorence
 

Hi Evan, Ok on the mic capacitor and possible RF into the mic. As I mentioned my Baofeng mic did not have that capacitor installed! 

My Rf testing with an antenna and Dummy load did not have any RF issues.

So, some Baofeng mics like mine may not have that capacitor installed, installing one may be more trouble than its worth!

Evan, you are correct many Electret mics do have a .001 mfd capacitor connected across the mic element terminals.

If some users experience Rf in their transmit audio, that might be a place to look, amongst many other arears.

--
Rob N8RT


Re: Just finished my first uBitx

Chris WB4ULK
 

Yes. That was an attempt at humor on my part. 😂


Yaesu MH-31 mic works great!

Chris WB4ULK
 

The Yaesu MH-31 mic works very well with the uBitx v6.
My audio reports have been “It sounds like you.”
Doesn’t get any better than that! 😀

It also drives my old Clipperton L amp to 110-120 watts, so it is turning out to be a great edition to the shack!


Re: No ssb out in ubitx v3 #ubitx #v3 #power

Evan Hand
 

Nikhil,
I forgot to point out that if you are not hearing SSB signals correctly when receiving, that you could also have a BFO tuning issue.  If the BFO is too far off the SSB filter will attenuate the audio and you will also not get much output.

I would check it with this link:
https://www.hfsignals.com/index.php/bfo-tuning-aid/ 
it does require a mic connected to your PC and works best with the Chrome browser.

73
Evan
AC9TU


Re: No ssb out in ubitx v3 #ubitx #v3 #power

Evan Hand
 

Nikhil,
It is common for SSB to show low values on a wattmeter.  Try providing a constant tone, or a long Heeeeeelloooooooow.  In another thread, there is a website that has an audio tone generator.  You can use that with a 1kHz and the mic close to the speakers.  Try different volumes and distances to see if the power out changes.  If so, then most likely you have a low audio drive from the mic.

I solved the low SSP audio by getting an amplified mic and using that. Others have gone to a preamp in the rig enclosure, and for the high end, a speech compression amp for maximum punch.  I have not that, so you will need to search the groups.io site or the internet for speech compression uBITX.
https://groups.io/g/BITX20/message/76912

Hope this helps a little
73
Evan
AC9TU


Re: No ssb out in ubitx v3 #ubitx #v3 #power

Nikhil B
 

When i keep my other SSB reciver in the room and talk, i can hear my voice on that receiver. But watt meter show no power. What is the problem? Which part do i need to check?


No ssb out in ubitx v3 #ubitx #v3 #power

Nikhil B
 

Can anyone tell me what the problem is?
Problem: no power in SSB mode.
Ubitx V3
 
When i push the ptt the rig go into tx, i can hear the relay clicking, current draw increases to 680mA. But on talking no current increase. No output power.
In CW mode there is 5watt power with tone.
 
I checked the mic, mic connector, wires and connectors to the board, any bad solder joint. All ok.
 
What maybe the reason no power in SSB mode?
 
I am new ham and this is my first rig, please help.

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