Date   
Re: µBITX : Try starting to build a new kit .....-- some mistake

HB9FIH
 

SRI... the Nextion was from Amazon one deliverer in UK:

https://www.amazon.de/dp/B008RU8WAK/ref=pe_3044161_185740101_TE_item

Erich

Re: µBITX : Try starting to build a new kit .....

HB9FIH
 

Bonjour Jean-Pierre

I am (was) in same progress / state for decisions. But now I have ordered all parts for me.

- AGC - bestellt (from kit-projects.com)
- CW Filter (300/1000Hz) - bestellt (from SOTABEAMS)

- Touch Display 2.8" - bestellt - (from hf-signals)
- ALU Case - the Parts from a manufacturer in Germany

Here in my blog I write all about my uBITX build: http://www.hb9fih.org/?p=p_629&sName=ubitx-2019

I am still in TA3 - mid of November all parts should be arrive (some are already arrived) in HB9.

I will start in December in my QTH on EA8 to build them up.

Erich

µBITX : Try starting to build a new kit .....

Behiels Jean-Pierre
 




 

Hi members;

 

I like to receive some additional documentation and info and possible some suggestions from experienced builders.

I like to buy a standard µBITX kit,but I will also add the already published modifications ,if they are ..

I do not exactly who they are and where I can found a full documentation of those mods ?

Like a full colour touch screen and many released mods and useful add-on features …

 

  • I hear talking about some NEXTION screens and so on ….
  • Updated software implementations ?
  • K5BCQ kits ?

 

Could some of you point me in the right direction where I can found what like components (NEXTION screen) some add -on kits and of course the building documentation and information.

So I can read a lot,before I make a decision for full add-on µBITX kit with some additional features ?

I hope some people µBITX builders could give me the correct suggestions,and help to start with

 

Kindly regards Jean ON4AEF.

 

http://ubitx.net/recommended-fixes-and-mods/

 

 

ENGIE Mail Disclaimer: http://www.engie.com/disclaimer/


test

Behiels Jean-Pierre
 

Re: Gordon Gibby Digital Interface

Gordon Gibby
 

On the input to the VOX push to talk switch transistor, I used to use a 47K but we switched to a 4.7K to get a little better sensitivity for that circuit.  It’s still presents almost 0 loading to the audio source.   

I use the extremely cheap adafruit 1475 usb sound dongle , but probably there are much better ones out there— if anyone has ever found a study comparing them I’d be very interested

A good number of these are what is called “classless “. They don’t require any drivers other than what comes already in your computer.  I don’t completely understand that, but they work with raspberry pie as well as windows




On Oct 21, 2019, at 05:57, Gordon Gibby <ggibby@...> wrote:

[External Email]

​If he has a 47K, you can just slip the 4.7K in parallel, solder to the original leads of the 47K and it will be about 4K and work fine.   

There just isn't that much that is "critical"



From: BITX20@groups.io <BITX20@groups.io> on behalf of N8DAH <Dherron@...>
Sent: Monday, October 21, 2019 1:58 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Gordon Gibby Digital Interface
 
[External Email]

Gordon,

 Thanks for the reply!

Sascha,

 I do apologize for the mix up I built a lot of them in a haze and must have mixed them up. Again very sorry about the mix up.

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: LM324 AGC Issue

Neil Tolman
 

Albert,
This download only works if you've purchased something from them. Is it possible you could share the pdf with us?
K1NBT
Neil

On Sunday, October 20, 2019, 7:59:09 PM EDT, <albert@...> wrote:


Here is some information I passed to another person that helped them.
I had issues also but using the alternate calibration method, things popped right in.

Go to the amateurradiokits website.
You have to go to "My Account" dropdown (Orange Button)
Depending on the login state you may have to login.
There you will find a "downloads" link. (7th down)
Download the "uBitx Nextion Case" (last one, takes a while) 
Decompress is and look for a folder called "AGC" 
When you get to building / calibrating the AGC board use the "AGC Details.pdf" file found in the AGC folder! 
This is a multi-page PDF file.

Look at the entire file, at almost the end of the document is an alternate calibration method. Try that.

BTW:
DON'T download the second folder down (AGC) from the downloads amateurradiokits website. It will not give you ALL the information you need to know.
I used the AGC folder from the "ubitx nexton case" folder. (Spent a couple of days figuring that out.)


Hope this helps!
Albert
KE0PRX

Re: Gordon Gibby Digital Interface

Gordon Gibby
 

​If he has a 47K, you can just slip the 4.7K in parallel, solder to the original leads of the 47K and it will be about 4K and work fine.   

There just isn't that much that is "critical"



From: BITX20@groups.io <BITX20@groups.io> on behalf of N8DAH <Dherron@...>
Sent: Monday, October 21, 2019 1:58 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Gordon Gibby Digital Interface
 
[External Email]

Gordon,

 Thanks for the reply!

Sascha,

 I do apologize for the mix up I built a lot of them in a haze and must have mixed them up. Again very sorry about the mix up.

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: Gordon Gibby Digital Interface

 

Gordon,

 Thanks for the reply!

Sascha,

 I do apologize for the mix up I built a lot of them in a haze and must have mixed them up. Again very sorry about the mix up.

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

kit-projects.com ND6T AGC - how to verify / S-meter settings / RF gain control #ubitx

Rob French (KC4UPR)
 

Hello,

I'm slowly upgrading my uBITX.  My latest add was the ND6T AGC from kit-projects.com.  I have it successfully (I think!) installed, but I'm thinking I may have missed something.  

I have all of the wires connected correctly, as far as I can tell.  I can listen just fine to signals pretty much as I did previously, so clearly I have managed to get a signal through the board (since I did verify that I had successfully cut the trace between the board input/output).  I did wire up the RF gain control, using RG-174 that I grounded at the panel (but not at the AGC; I do have a chassis ground).  

However, for the life of me, I can't tell if there's any difference between off/slow/fast.  If they are supposed to keep my signal level relatively even, that is definitely not happening.  I can definitely tune the volume to a comfortable level for one signal, and then have another strong signal pop in nearby, and it doesn't seem to gain anything down.  

How can I go about testing that this is working correctly?  I have verified (a) that I can receive signals, (b) that the RF gain control works, and (c) that the board is receiving 12 VDC.  I haven't been able to verify anything else though, i.e. that it's actually doing AGC.

Also, does anyone have a reasonable set of S-meter settings for the KD8CEC firmware, when used with the stock Raduino A7 pin connected to the AGC S-meter output?  Did anyone have to do anything special as far as connecting the A7 pin to the AGC?  When there are no transmitted signals on 40 meters, just static, my S-meter voltage is literally 0, which surprised me (maybe that's right?), and I haven't seen it go about 50 while listening to all the FT8 traffic on 7074.  Does that signal need to be amplified, or should it be fine as it comes off the board?

Finally, as mentioned, I did install an RF gain control.  I used a 1K audio taper pot... is that the right thing to use?  It seems like almost all of the change is in the last 1/4 turn.

Thanks for your help! 

-Rob

Re: LM324 AGC Issue

Murray Wills (ZL2IQ)
 

Thank you. Murray ZL2IQ


From: BITX20@groups.io <BITX20@groups.io> on behalf of albert via Groups.Io <albert@...>
Sent: Monday, October 21, 2019 12:59:02 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] LM324 AGC Issue
 
Here is some information I passed to another person that helped them.
I had issues also but using the alternate calibration method, things popped right in.

Go to the amateurradiokits website.
You have to go to "My Account" dropdown (Orange Button)
Depending on the login state you may have to login.
There you will find a "downloads" link. (7th down)
Download the "uBitx Nextion Case" (last one, takes a while) 
Decompress is and look for a folder called "AGC" 
When you get to building / calibrating the AGC board use the "AGC Details.pdf" file found in the AGC folder! 
This is a multi-page PDF file.

Look at the entire file, at almost the end of the document is an alternate calibration method. Try that.

BTW:
DON'T download the second folder down (AGC) from the downloads amateurradiokits website. It will not give you ALL the information you need to know.
I used the AGC folder from the "ubitx nexton case" folder. (Spent a couple of days figuring that out.)


Hope this helps!
Albert
KE0PRX

Re: LM324 AGC Issue

albert@...
 

Here is some information I passed to another person that helped them.
I had issues also but using the alternate calibration method, things popped right in.

Go to the amateurradiokits website.
You have to go to "My Account" dropdown (Orange Button)
Depending on the login state you may have to login.
There you will find a "downloads" link. (7th down)
Download the "uBitx Nextion Case" (last one, takes a while) 
Decompress is and look for a folder called "AGC" 
When you get to building / calibrating the AGC board use the "AGC Details.pdf" file found in the AGC folder! 
This is a multi-page PDF file.

Look at the entire file, at almost the end of the document is an alternate calibration method. Try that.

BTW:
DON'T download the second folder down (AGC) from the downloads amateurradiokits website. It will not give you ALL the information you need to know.
I used the AGC folder from the "ubitx nexton case" folder. (Spent a couple of days figuring that out.)


Hope this helps!
Albert
KE0PRX

Re: Reset Raduino - How

Clark Martin
 

One of my goto tools is a logic probe.  It’s 30-40 years old, the LEDs are a little hard to read at times but it still works great.  It would quickly diagnose a problem like this by testing each pin of the encoder as I turn the knob.  The encoder A&B lines would show high - low - high… transitions and ground would stay low all the time if it’s working right.  You can do it with a DVM but the logic probe makes it far easier.

Clark Martin
KK6ISP

On Oct 20, 2019, at 10:54 AM, Curt via Groups.Io <wb8yyy@...> wrote:

If turning knob no longer changes frequency and the display, first I would wonder if it still has electrical contact via that inter board connector, possibly it is no longer properly seated. Try jiggling it to see if function is restored. Next likely may be a solder joint in the path has failed. Turning off dc power should take it back to a default condition,  showing perhaps the issu is not within the raduino.

Re: Reset Raduino - How

MVS Sarma
 

At times I forget to plug in the digital 8 way plug. If such is the case by mistake, no woner encoder is not connected.

Secondly, the op needs to check ground connection of rotary encoder for possible dry or break.

On Sun, 20 Oct 2019, 11:25 pm Curt via Groups.Io, <wb8yyy=yahoo.com@groups.io> wrote:
Luke

If turning knob no longer changes frequency and the display, first I would wonder if it still has electrical contact via that inter board connector, possibly it is no longer properly seated. Try jiggling it to see if function is restored. Next likely may be a solder joint in the path has failed. Turning off dc power should take it back to a default condition,  showing perhaps the issu is not within the raduino.

Curt

Re: Reset Raduino - How

Curt
 

Luke

If turning knob no longer changes frequency and the display, first I would wonder if it still has electrical contact via that inter board connector, possibly it is no longer properly seated. Try jiggling it to see if function is restored. Next likely may be a solder joint in the path has failed. Turning off dc power should take it back to a default condition,  showing perhaps the issu is not within the raduino.

Curt

Reset Raduino - How

Luke
 

uBitx ver 4,3
Frequency stucked at 7.149,950

How to reset Raduino

Re: S Meter Nextion 3.2

Jerry Gaffke
 

Monitoring the control voltage of an added AGC circuit or the output of a logarithmic detector such as the AD8307
can give a useful S-meter indication. 
A diode detector on the audio read by a 10 bit ADC will have severely limited dynamic range,
a max of 3 S-units assuming the logarithmic conversion is carried out in firmware.


On Sun, Oct 20, 2019 at 02:12 AM, Vic WA4THR wrote:
The S-meter requires an external circuit to supply the signal level information. There are several choices ranging from a simple diode detector all the way up to a more complicated second Arduino chip. Take a look at the KD8CEC website as he describes several easily wired circuits. I started with an LM386 amp and detector that connects between the volume pot and a spare Raduino input, and that worked very well. I later replaced that with the second Arduino to get some additional features.

Re: S Meter Nextion 3.2

Vic WA4THR
 

The S-meter requires an external circuit to supply the signal level information. There are several choices ranging from a simple diode detector all the way up to a more complicated second Arduino chip. Take a look at the KD8CEC website as he describes several easily wired circuits. I started with an LM386 amp and detector that connects between the volume pot and a spare Raduino input, and that worked very well. I later replaced that with the second Arduino to get some additional features.

=Vic=

Re: LM324 AGC Issue

Murray Wills (ZL2IQ)
 

Thanks Joel. I have replaced the LM324 just in case but still no luck.

Murray ZL2IQ


From: BITX20@groups.io <BITX20@groups.io> on behalf of Joel Caulkins/N6ALT via Groups.Io <caulktel@...>
Sent: Sunday, October 20, 2019 10:18:56 AM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] LM324 AGC Issue
 
Hi Murry,

I built it and am currently using it without trouble. When setting it up, all voltages were able to attained without problem. Perhaps the LM324 is bad or you have it plugged in backwards.

Joel
N6ALT

Re: Gordon Gibby Digital Interface

Gordon Gibby
 

Since you aren’t getting transmit power, I would change that 47K to 4.7 K. 

The other one I would leave alone. 

If the rig goes in the transmission, and the only thing you have to do is provide enough audio to get the output that you want.  BitX’s need a bit more audio, as does the line input of icoms.   It all depends on what the transceiver requires.  

If you still don’t have enough output, change the 4.7 K in the audio path to 1K!!!




On Oct 19, 2019, at 18:48, Sascha Bohnet | DL5SMB via Groups.Io <saschabohnet@...> wrote:

[External Email]
Still fighting to get the interface working.

I did make direct solder connections to the usb sound card - but the problem was something else. I did not pick the hot end of the poti but the wiper. So the RX path is pobably okay now.
But if i try to go to TX mode, the radio switches to transmission (vox) but I do not get any output out.

Comparing Davids schematics with Gordons original circuit, I noticed a change of resistors, probably  a confusion:

R3 which connects the sound cards left left output channel to the 500 Ohm Poti before the tranformer is a 47k resistor in Davids kit,
in Gordons documentation this resistor is 4,7k oder 10k (depending on the signal level) and is referenced to as R12.

In the vox circuit of Gordons documention the signal of the right audio channel is led through a 47k resistor to the base of the transistor Q1 -
in Davis kit this is a 4,7k resistor.

I will check tomorrow if changing both resistors helps in my case. And then I will give some feedback to Rob about the C60 tapping :-)

Re: Gordon Gibby Digital Interface

Sascha Bohnet | DL5SMB
 

Still fighting to get the interface working.

I did make direct solder connections to the usb sound card - but the problem was something else. I did not pick the hot end of the poti but the wiper. So the RX path is pobably okay now.
But if i try to go to TX mode, the radio switches to transmission (vox) but I do not get any output out.

Comparing Davids schematics with Gordons original circuit, I noticed a change of resistors, probably  a confusion:

R3 which connects the sound cards left left output channel to the 500 Ohm Poti before the tranformer is a 47k resistor in Davids kit,
in Gordons documentation this resistor is 4,7k oder 10k (depending on the signal level) and is referenced to as R12.

In the vox circuit of Gordons documention the signal of the right audio channel is led through a 47k resistor to the base of the transistor Q1 -
in Davis kit this is a 4,7k resistor.

I will check tomorrow if changing both resistors helps in my case. And then I will give some feedback to Rob about the C60 tapping :-)