Date   
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 :-)

Re: 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: LM324 AGC Issue

Murray Wills (ZL2IQ)
 

Thank you Raj I will try those today


From: BITX20@groups.io <BITX20@groups.io> on behalf of Raj vu2zap via Groups.Io <rajendrakumargg@...>
Sent: Sunday, October 20, 2019 1:42:51 AM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] LM324 AGC Issue
 
Check R2, probably a wrong value.

See if you have an PCB hair line short, hot the board up to a strong back light and see if you spot anything!

Raj

At 19/10/2019, you wrote:
>Hi I have built up one of the LM324 AGC kits from India and used all the usual sources for circuits and photos to make sure it is installed correctly. The instructions say that there should be 4 volts at PIN 3 on the LM324 but I only have .75 volts maximum.
>
>Has anyone else had success with this kit?
>if not is there a recommended kit
>I have replaced the LM324 and the BC547 and found no difference.
>
>Cheers
>Murray ZL2IQ




Bitx 40 For Sale

Scot McMath
 

For sale novice built Bitx 40 in AmateurRadioKits grey metal case. Amunter's 
1.28.1 firmware with 10 turn 10k pot and function button, all working. 
Baofeng speaker mic that I was unable to get wired up. I have uBitx 4 thats 
working well so I have lost interest in this one.
$100 shipped USA
Scot WB7AVU... good in QRZ.com

Re: S Meter Nextion 3.2

Herman Scheper
 

Have the same problem with S meter not working on my 5” Nextion.


Herman vanaf z'n IPad.

Op 19 okt. 2019 om 17:25 heeft Steven <wera106@...> het volgende geschreven:

Hi all,
Thanks for all the help so far. My V5 uBitX now has the cec firmware, a nice case, working cw, a Nextion 3.2, and memory manager! This rig is great fun. There are several issues to fix but I'd first like to get the S meter working on the Nextion. I have checked the box in the memory manager, but still get a flat red line and a static S meter bar. What am I missing?

  Also, any chance there is a users guide out there?

Thanks!
Steven KM4WIP

S Meter Nextion 3.2

Steven
 

Hi all,
Thanks for all the help so far. My V5 uBitX now has the cec firmware, a nice case, working cw, a Nextion 3.2, and memory manager! This rig is great fun. There are several issues to fix but I'd first like to get the S meter working on the Nextion. I have checked the box in the memory manager, but still get a flat red line and a static S meter bar. What am I missing?

  Also, any chance there is a users guide out there?

Thanks!
Steven KM4WIP

Re: sotabeams filter

Jack, W8TEE
 

I have a SOTA Beams DSP Filter unit and it works very well.

Jack, W8TEE

On Saturday, October 19, 2019, 7:23:11 AM EDT, HB9FIH <erich.rieder@...> wrote:


Hi Dave

not now finished with my uBITX but planned all the additional stuff....(for CW)

So I would build in like on schematic (I also have an AGC)

73 Erich

 


--
Jack, W8TEE

Re: LM324 AGC Issue

 

Check R2, probably a wrong value.

See if you have an PCB hair line short, hot the board up to a strong back light and see if you spot anything!

Raj

At 19/10/2019, you wrote:
Hi I have built up one of the LM324 AGC kits from India and used all the usual sources for circuits and photos to make sure it is installed correctly. The instructions say that there should be 4 volts at PIN 3 on the LM324 but I only have .75 volts maximum.

Has anyone else had success with this kit?
if not is there a recommended kit
I have replaced the LM324 and the BC547 and found no difference.

Cheers
Murray ZL2IQ

Re: sotabeams filter

Curt
 

Well his point is that its better to filter out potentially big signals sooner in the chain. Also if the filter board does not provide an amplifier,  more so.

You can always try an audio filter in a few spots,  to see what works. Since its easier at the very end, try it out.

Curt

Re: LM324 AGC Issue

MVS Sarma
 

Raj, 
It is there in files section og bitx20 groups site as pdf from vu3sua.
Regards 
Sarma vu3zmv

On Sat, 19 Oct 2019, 5:08 pm Raj vu2zap, <rajendrakumargg@...> wrote:
Could not find the circuit, could you share so we can look at it and see what may be the issue!

Raj

At 19/10/2019, you wrote:
>Hi I have built up one of the LM324 AGC kits from India and used all the usual sources for circuits and photos to make sure it is installed correctly. The instructions say that there should be 4 volts at PIN 3 on the LM324 but I only have .75 volts maximum.
>
>Has anyone else had success with this kit?
>if not is there a recommended kit
>I have replaced the LM324 and the BC547 and found no difference.
>
>Cheers
>Murray ZL2IQ