Date   

Re: Ubitx V3 - No tx issue #v3

Praba Karan
 

I mean bottom one of two square pots.


On Tue 13 Oct, 2020, 10:36 PM Jonas Sanamon, <sanamon@...> wrote:
Hi Praba,

I suspect that the pot you refer to as bottom pot is the drive level adjustment. 
The bias pots are of same type but the drive level pot is of a different type in my v3

regards, 
Jonas - SM4VEY

13 okt. 2020 kl. 19:02 skrev Praba Karan <vu3dxr@...>:

Please clarify whether bottom pot bias pairing with left side MOSFET?

I noted 0.9 V only on tab of left MOSFET. However during PTT, 3.6V noted in gate. Similiarly, anticlockwise movement of bottom pot do not vary current drawn.


Re: Ubitx V3 - No tx issue #v3

Jonas Sanamon
 

Hi Praba,

I suspect that the pot you refer to as bottom pot is the drive level adjustment. 
The bias pots are of same type but the drive level pot is of a different type in my v3

regards, 
Jonas - SM4VEY

13 okt. 2020 kl. 19:02 skrev Praba Karan <vu3dxr@...>:

Please clarify whether bottom pot bias pairing with left side MOSFET?

I noted 0.9 V only on tab of left MOSFET. However during PTT, 3.6V noted in gate. Similiarly, anticlockwise movement of bottom pot do not vary current drawn.


Re: Yes, My homebrew µBitx now work!!

Gerard
 

hello Mick,
Thanks for the information.
 Yes, today I worked on the ubitx manager for the Smeter and saw that there was an option to save these settings IFS
My calibration and BFO setting must not be too bad, because I am in the center of the IF shift.
I still have to adjust the pb of the Smeter on the Nextion screen, because it is always full.
The story of the wire on the signal A7 of the arduino is a bad track. to connect it to what? No, I think it’s soft and an option to activate correctly the smeter  as Evan said.
Moreover I look forward to an amplifier because, even with an output on HP of 0.5W, it is too weak to understand.... except for a Ham ... Victoria Bravo ...who passed very hard over everyone. Besides, he is in Mexico, so for me it is a satisfaction to have heard  it from France with a tempory installation.
There is still work to do
I use the ubitx in reception mode. Power stage is not cabled

cdt


Re: Ubitx V3 - No tx issue #v3

Praba Karan
 

Please clarify whether bottom pot bias pairing with left side MOSFET?

I noted 0.9 V only on tab of left MOSFET. However during PTT, 3.6V noted in gate. Similiarly, anticlockwise movement of bottom pot do not vary current drawn.


Re: Yes, My homebrew µBitx now work!!

Mick
 

Evan, Gerard,
If you use Ian’s KD8CEC software you can save the ATT and IF shift values and up load them to memory. I’ve found if you get the BFO and frequency correct you don’t need to use IF shift.
The best process for fine tuning the BFO (after following Ashhar’s directions) is to use Roberts N8RT tone generator suggestion. See below

 

“A way to Check the audio SSB frequency response of your microphone. 

There is a an audio ONLINE Tone Generator that is free and tunes covers 1Hz to 20,000 Hz .

The Generator is available here:

 https://www.szynalski.com/tone-generator/

Works on ANDROID and PC’s maybe others.

Connect your transmitter into a DUMMY LOAD, Connect a Wattmeter appropriate to your transmitter power. 

Key the transmitter in CW Mode to make sure your wattmeter is showing at least ½ scale on the watt meter, this is not super important and is just a reference.

Now switch back to SSB and place the device you have downloaded the tone generator speaker next to your microphone, key your transmitter and on the Tone, Generator slide the button left and right and you can now see the PEAK frequency response of your SSB audio. ( The distance from the device speaker and the mic will only increase or decrease the power reading) 

I wanted to check my UBITX Ver 6 , SSB Rf output power, frequency response of my  Modified Baofeng mic. (posted here) https://groups.io/g/BITX20/message/81778

 This frequency  measurement is very dependent on your UBITX  BFO adjustment, make sure that you have calibrated that before you do this test. My UBITX SSB power,   mic frequency peaked at about 900 hz , and fell off on each side of the 900hz frequency. 

Rob N8RT“

 

--
 

73
Mick VA3EPM 


Re: Yes, My homebrew µBitx now work!!

Gerard
 

Evan,
I think I found a solution to a pb
I said that sometimes I had to reinstaller ubitx manager to communicate.
In fact, I think the ubitx should not be on, but simply make the connection with the USB socket. in this case the arduino is self-powered and it works.
So for me it’s settled.
For the Smeter, reading in manager gives low 252 and hight 250!!!!
But here too, I think have found
We have to make a connexion in the Ubitx 
Thank you for confirming that you need to go through this step
cdt
on hamskey:
2.S.Meter signal connection
 
When uBITX is shipped and assembled according to manual, one purple line is left. (A7 Pin)



The purple line in the picture below. Input the signal for S.Meter to this line.
There are various ways to get S.Meter signals from uBITX.
What should be noted is that you must have enough current to be able to measure in the Arduino.

After connecting S.Meter signal line to A7, it must be set in uBITX Manager. This way we can apply most S.Meter modifications completely to uBITX.
cdt


Re: Very low audio/hiss from uBitx speaker after Nextion 3.5 update #nextion #v6 #ubitx #ubitxv6

vu3gwn
 

After trying out the steps, I think I have arrived at a good value for 40m which is 210000 and 110570500. But the problem is this setting completely makes the 20m sound bad. If I adjust 20m, then 40m goes for a toss. Never used to happen with plain vanilla Bitx...How to correct this with Kd8CEC....Can we store band specific calibration values ?

Thanks !


Re: Very low audio/hiss from uBitx speaker after Nextion 3.5 update #nextion #v6 #ubitx #ubitxv6

vu3gwn
 

Thanks. I had not seen the menu options for Calibration in KD8CEC builds...And I had not set the code to V5...You were right now both counts...now trying to get the best possible voice...

Thanks !


Re: Hfsignals send ubitx on 3rd of march #ordering #ubitxv6 #homebrew #v6

Support HF Signal
 

Hello Burcak,

Yes we will sort this out for you. Please do write to us at support@...

Thanks,

Thomas

On Tue, 13 Oct 2020 at 14:01, Burçak Çubukçu <burcakcubukcu@...> wrote:

My tracking code is RN190061493IN

Still waiting for my uBitx since march

Please help.

Thanks,
de TA2EE Burçak Cubukcu



--
Support@HFSignals


--
Support@...


Re: Hfsignals send ubitx on 3rd of march #ordering #ubitxv6 #homebrew #v6

Jonas Sanamon
 

Hi Burçak,

I'd contact support@... for help with this. They are very helpful and should be able to help and solve the problem.

Regards, Jonas


Den tis 13 okt. 2020 kl 10:31 skrev Burçak Çubukçu <burcakcubukcu@...>:

My tracking code is RN190061493IN

Still waiting for my uBitx since march

Please help.

Thanks,
de TA2EE Burçak Cubukcu


Re: Portable Ops #ubitxv6 #portable

Jonas Sanamon
 

Hi Aaron,

The aluminium case is the Hammond 1455T1601 which is a nice size, but really a tight fit for the uBitx. The board need to sit sideways (I have Radiuno on right side and IRF510 on left side), and the height is so low that I need to bend the pins on the Radiuno to 45 deg in order for it to get under the lid. I have a piece of copper plate screwed to bottom of case on left side that the IRF510 transistors are screwed into for cooling. I feed the raw voltage from LiPo battery pack( approx 18v) to the PA and have a 12v linear regulator (planning to replace with a switch mode when I find one sufficiently QRM-free) also on the copper plate to get the voltage down for the 12v part of the radio. I have also moved the 5v linear regulator to the back plate for better cooling (also thinking of a switch mode replacement here)
Photo from inside during assembly, You can see copper plate and radiuno angle;
image.png


Yes, the Makita battery powers the uBitx. Works for hours of portable use, and its easy to have a replacement in the pocket. Handy if you already have their tools and batteries + charger (recommended by the way, I've used my "impact screwdriver" and drill for years and thousands of holes and screws, still works perfectly and is strong as an oxe)

The case is 3D-printed from this design: https://www.thingiverse.com/thing:2925336
The Makita battery holder is 3D-printed from: https://www.thingiverse.com/thing:352094  

I'm considering installing a N7DDC tuner inside the 3D-printed black enclosure. It wont fit inside the Hammond case unless I remove the speaker.
The black case has a small CPU-fan that cools the IRF510 heat sinks, it's running half speed in RX and full speed in TX-mode.  It has a LM386 module added for more audio volume, can be seen on manhattan-style PCB to the right. Copper plate installed for heat sinking of 7812 and 7805 Linear regulators:
image.png

Cheers, Jonas - SM4VEY


Den mån 12 okt. 2020 kl 20:26 skrev Aaron K5ATG via groups.io <k5atg=yahoo.com@groups.io>:

Jonas,
I like the aluminum case, the 3-d printed one looks cool. Is the Makita powering the UBitX?
I also have the N7DDC Tuner for the UBitX. I don't have it finished yet, I am making a case for it from PCB board and I need to order some buttons for it. I literally finished installing a Nextion on my BitX this morning, I don't have any extras for it as I am still learning it. 
--
'72
Aaron Scott


Re: Yes, My homebrew µBitx now work!!

Evan Hand
 

Gerard,
I have one of these installed in one of my v4 uBITX.  It works very well.  As others have said, you will need to be careful with earphones, as it can generate a very high sound level.

I have not used the ATT and IF Shift much, but do believe that the settings are not saved after shutting down the uBITX.  It would be nice, however, that would require a lot of reads and writes to the EEPROM that could cause an early failure.  The buttons are on the main screen.  There are sliders for each of them, however they are small.  Maybe just modifying the Nextion screen to enlarge them would work for you.

Most hams use a stylus to operate the small touch screen.  Plastic with a rounded and smooth tip so that you do not scratch the screen. 

73
Evan
AC9TU


Re: Hfsignals send ubitx on 3rd of march #ordering #ubitxv6 #homebrew #v6

Burçak Çubukçu
 

My tracking code is RN190061493IN

Still waiting for my uBitx since march

Please help.

Thanks,
de TA2EE Burçak Cubukcu


Re: Yes, My homebrew µBitx now work!!

Gerard
 

Evan,
I ordered the amplifiers. (5 modules for 10 euros!!! + free shipping) so only 2 euros per module. I’ll have them in less than 4 days. Thanks Jeff!
Another question on use.
On the Nextion and also in the yellow menu, you can set ATT and RIF.
Is this adjustment to be done once and for all, where should it be constantly adjusted according to the reception and the band?
If so, I find that this is not very convenient with the touch screen because it’s very small even with a 3.2-inch screen. And if you have to go through the encoder, it’s also not easy.
I was wondering, if it would be simpler to keep these 2 buttons on the main screen of the nextion, and by clicking on it make appear a bargraph all screen for setting. But this requires some modifications in the soft. 
Cdt


Re: Yes, My homebrew µBitx now work!!

Ashhar Farhan
 

Mick,
Be very careful. With a strong signal, the TDA2030 can deliver a full 20 watts directly to your ear drum. Unless you are using a reliable AGC, you risk ruining your hearing.
- f

On Tue 13 Oct, 2020, 5:13 AM Mick, <Mgsebele@...> wrote:
I installed the TDA 2030 audio amp for my speaker connection. It works very well. I use headphones normally and I don’t need the extra volume for them. The TDA has a volume pot on it so you can adjust so that switching between headphones and speaker is “balanced”.
--
 

73
Mick VA3EPM 


Re: Another twist to AGC for the ubitx

barry halterman
 

Mitchel, you are correct the schematic shows the cap then the resistors but on the board it is resistor then cap.
Barry

On Mon, Oct 12, 2020, 5:53 PM barry halterman via groups.io <kthreebo=gmail.com@groups.io> wrote:
The voltage off the emitter ranges from zero to about 7volts.


On Mon, Oct 12, 2020, 2:29 PM Mitchel Rought <mitchelrought@...> wrote:
on the print I have for the V6, R37 and C32 from Q32 are reversed, typo ?


Re: Yes, My homebrew µBitx now work!!

Mick
 

I installed the TDA 2030 audio amp for my speaker connection. It works very well. I use headphones normally and I don’t need the extra volume for them. The TDA has a volume pot on it so you can adjust so that switching between headphones and speaker is “balanced”.
--
 

73
Mick VA3EPM 


Re: Another twist to AGC for the ubitx

barry halterman
 

The voltage off the emitter ranges from zero to about 7volts.


On Mon, Oct 12, 2020, 2:29 PM Mitchel Rought <mitchelrought@...> wrote:
on the print I have for the V6, R37 and C32 from Q32 are reversed, typo ?


Re: Yes, My homebrew µBitx now work!!

Gerard
 

Evan,
I made the change this afternoon for pop
This cuts the sound well when I switch to TX, but as soon as we return to RX there is always a noise as if a capacitor were draining. This noise is lower and lower if you stay longer in TX.
I’ll look at the diagram again and remove the 220µ condenster changed recently and put one of 1µ on the audio input.
For the speaker, the circuit is a mjn2073. The datasheet gives only 0.5Watts.
It is too weak.
I saw this post
https://groups.io/g/BITX20/topic/71617932#76585
I think we need to add this module or other like that:
https://www.amazon.com/XLX-TDA2030A-Amplifier-Speakers-Converter/dp/B07QNW61G5/ref=sr_1_1?keywords=XLX+5PCS+TDA2030A&qid=1582959342&sr=8-1

Then if we want to chipper, I noticed that the more frequency we get, the more we hear the rotation of the encoder....

cdt


Re: Portable Ops #ubitxv6 #portable

Aaron K5ATG
 

Vic,
Your case is pretty sharp. 
One thing I love about the uBitX and BitX is the creativity. You can find 500 IC7300 or KX3 and they will all pretty much look and operate the same. You can find 10 uBitx or BitX's and they will all be different. These little rigs have some character and some soul to them. 

Frank,
Yeh I use cheap Westinghouse brand AA Ni-Ma 2000 mAh batteries. I think I found a deal where I got 40 batteries for $20 back in 2015 and I have only 2 batteries go bad since. This is the battery holder I  use

It has a plug on the short cord that fits perfectly in my radios and an on and off switch that I use then they are not in use. They were a few bucks on E-bay and I take a few with me when I go operate portable. A single pack is not going to last all day long and it is what it is so you have to have realistic expectations on them but they can do the job. I don't know how well it will work on my uBitX because I suspect that the Nextion is a bit power-hungry.
I have no experience with the 18650 cells but giving them a quick look shows a lot of options for them.
--
'72
Aaron Scott
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