Date   
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




Re: LM324 AGC Issue

 

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

Re: sotabeams filter

HB9FIH
 

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

 

sotabeams filter

dgclifford@...
 

Hi men I am contemplating fitting the Sotabeams filter to my ubtix  v5, Richard Newstead the owner of Sotabeams   recommends fitting the filter "further back  down the audio chain", any one fitted one of these and if so what do you recommend .  Many thanks   Dave C

Re: uBITX Code Compilation Problem

Adrian Rees
 

Mark, Jack
Thank you for the emails. I'll try a few things this weekend and see how I get along.

Thanks again.

Adrian M1LCR

On 18/10/2019 16:34, Jack, W8TEE via Groups.Io wrote:
Mark:

It is possible to still get errors even if you have all of the proper source code files in the right project directory. My experience is that some people don't install the proper library files in the right directories or they use the "<>" and double-quoted header file directives incorrectly. Unfortunately, the actual error message displayed varies according to the exact nature of the error, so it's difficult to summarize.

While this is a simplification, it may help some understand the process. When you use a standard library function (e.g., Serial.print(), delay(), pinMode(), etc.), the source code for those functions is not in your project directory. Because the compiler doesn't see the code for these standard functions, it leaves question marks after the function name at the point where those functions' code should be placed. When the compiler is done, it automatically loads another program called a Linker. It's the Linker's responsibility to plug those holes in the program where the question marks are. If you surround the library name in double quotes:

    #include "MyLibrary.h"

the Linker looks in the current project directory for the missing library code (i.e., probably MyLibrary.cpp). If the Linker still can't find the library code, it will search the default library path (e.g., C:\Arduino1.8.10\libraries) for the missing code. If you use angle brackets on the library file:

   #include <MyLibrary.h>

the Linker only looks in the default library path. So, double-quotes searches the project directory for the missing code and, if not found, it searches the default library path. If you use angle brackets, it only searches the default library path, not the project directory.

Anyway, you need to have both your project's code and any called libraries in their expected places or you will get an error message.


Jack, W8TEE

On Friday, October 18, 2019, 10:38:51 AM EDT, Mark - N7EKU <n7eku@...> wrote:


Hi Adrian,

When you unzip the original files, there will be an .ino file named for the code version.  You need to make a folder with the exact same name (except the .ino part) and put all the files into that folder.  Then it should compile fine.  The IDE only looks for the needed files in a folder with the same name as the code.

73,


Mark.

--
Jack, W8TEE


Re: uBITX Code Compilation Problem

MVS Sarma
 

I use older version ide  1.8.5.
 it does compile without issues.
 latest versions , i have issues  with my laptop working win7 64bit.


On Sat, Oct 19, 2019 at 8:30 AM Mark - N7EKU <n7eku@...> wrote:
Yeah for sure,

However it sounds like he is just trying to compile the orginal code, so all that is required should be in Farhan's zipped package on github.  Also, the error message is the exact same that I got when I didn't have these files placed correctly.

73,


Mark.

Re: Using FT8 with Bitx40 (and microphonic problem). #bitx40 #ft8

Werner de Vos
 

JS8CALL will do the job.

LM324 AGC Issue

Murray Wills (ZL2IQ)
 

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: uBITX Code Compilation Problem

 

Yeah for sure,

However it sounds like he is just trying to compile the orginal code, so all that is required should be in Farhan's zipped package on github.  Also, the error message is the exact same that I got when I didn't have these files placed correctly.

73,


Mark.

Re: Cal Fire Moves to Dismantle Ham Radio System,EndangeringLives Amid Blackouts and Wildfires | Trending

Terry L. Morris
 

I said this incorrectly;
I agree with Michael. This board is about the Bitx20 not Cal Fire. I've checked most of the groups on this board from or having anything to do with California. None of the (less than 50% that permit message topics) groups are discussing this issue.

I don't disagree that this issue should be discussed, just not here. Another group should be started for this issue and further discussion in this group about CAL fire should be halted.

My two cents worth! KB8AMZ

Re: cw filters

Jerry Gaffke
 

The MAX7400 is a low pass filter, however if the uBitx crystal filter is doing 
its job there should already be a sharp lower cutoff frequency of around 300 Hz.
So the total system is effectively a good sharp bandpass filter.
That lower cutoff frequency can be adjusted by moving the BFO.

Jerry, KE7ER


On Fri, Oct 18, 2019 at 03:58 PM, Jerry Gaffke wrote:
The MAX7400 switched capacitor audio low pass filter is an interesting part.
Simple to use, and only draws a couple ma.
Has an internal oscillator that Andy is tuning with the 1n4148 used as a varicap diode,
but could drive the clock pin from a Nano counter-timer at 100 times the desired corner frequency.
That way you could tune it in firmware.

However, this is a low pass filter, not a band pass filter like some of the alternatives are.
So it will not attenuate frequencies that are below the desired signal.

Jerry, KE7ER
 

Re: cw filters

Jim Willis
 

Nice!

 

73,

 

Jim KX4TD

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of jim via Groups.Io
Sent: Friday, October 18, 2019 7:14 PM
To: BITX20@groups.io
Subject: Re: [BITX20] cw filters

 

As an "analog" alternative, I use this on my uBitx

Jim

On Friday, October 18, 2019, 3:59:02 PM PDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

 

 

The MAX7400 switched capacitor audio low pass filter is an interesting part.
Simple to use, and only draws a couple ma.
Has an internal oscillator that Andy is tuning with the 1n4148 used as a varicap diode,
but could drive the clock pin from a Nano counter-timer at 100 times the desired corner frequency.
That way you could tune it in firmware.

However, this is a low pass filter, not a band pass filter like some of the alternatives are.
So it will not attenuate frequencies that are below the desired signal.

Jerry, KE7ER
 

On Fri, Oct 18, 2019 at 10:58 AM, Martin Potter wrote:

Here is a simple circuit that I have been using and find that it works quite well for both CW and SSB. It is a variable bandwidth filter, based entirely on the circuit developed by Andy, RW9RN (thanks, Andy!!). It uses the MAX7400 switched-capacitor filter (SCAF) chip

Re: uBITX v5.1 and uBITX_Manager_V1.11 problem

pd0zz@...
 

Ahhh, Thank you Herman.
With this short instruction I will try to find my way! Now is JOTA, so busy this weekend!
Thanks from Martin, PD0ZZ

Op 17-10-2019 om 23:04 schreef Herman Scheper:

First you have to use Xloader software to programm the Arduino nano with the CEC hex file you need. You can find it on the hamskey.com website. I am now on the wrong place to inform you better. It take me a week before i get it running on my ubitx v5. Before have Xloader working take a day for me as Arduino nano rookie.  I printed a lot of information all coming from the Hamskey site.  Veel succes van PA0BAB

Herman vanaf z'n IPad.

Op 17 okt. 2019 om 22:23 heeft pd0zz@... het volgende geschreven:

Hello, the arduino nano in my newly installed uBITX V5.1 is unreacheble from the program uBITX_Manager_V1.11.
I wanted to install uBITX_CEC_V1.200, but alas, as rookie I can't get it working.
The problem is that uBITX-Manager cannot contact the arduino, even after checking portsettings in win10.
Tell me what to do?
Thanks, Martin


Virusvrij. www.avast.com

Re: cw filters

jim
 

As an "analog" alternative, I use this on my uBitx

Jim


On Friday, October 18, 2019, 3:59:02 PM PDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:


The MAX7400 switched capacitor audio low pass filter is an interesting part.
Simple to use, and only draws a couple ma.
Has an internal oscillator that Andy is tuning with the 1n4148 used as a varicap diode,
but could drive the clock pin from a Nano counter-timer at 100 times the desired corner frequency.
That way you could tune it in firmware.

However, this is a low pass filter, not a band pass filter like some of the alternatives are.
So it will not attenuate frequencies that are below the desired signal.

Jerry, KE7ER
 

On Fri, Oct 18, 2019 at 10:58 AM, Martin Potter wrote:
Here is a simple circuit that I have been using and find that it works quite well for both CW and SSB. It is a variable bandwidth filter, based entirely on the circuit developed by Andy, RW9RN (thanks, Andy!!). It uses the MAX7400 switched-capacitor filter (SCAF) chip

Re: cw filters

Jerry Gaffke
 

The MAX7400 switched capacitor audio low pass filter is an interesting part.
Simple to use, and only draws a couple ma.
Has an internal oscillator that Andy is tuning with the 1n4148 used as a varicap diode,
but could drive the clock pin from a Nano counter-timer at 100 times the desired corner frequency.
That way you could tune it in firmware.

However, this is a low pass filter, not a band pass filter like some of the alternatives are.
So it will not attenuate frequencies that are below the desired signal.

Jerry, KE7ER
 


On Fri, Oct 18, 2019 at 10:58 AM, Martin Potter wrote:
Here is a simple circuit that I have been using and find that it works quite well for both CW and SSB. It is a variable bandwidth filter, based entirely on the circuit developed by Andy, RW9RN (thanks, Andy!!). It uses the MAX7400 switched-capacitor filter (SCAF) chip

Re: cw filters

MONEYSMITH
 

I BUILT THE HIPERMITE AND IT IS EXCELLENT. SIMPLE AND SMALL IN SIZE.
IT IS AN EXCELLENT ACC TO ANY RECEIVER.
W4NFR BILL


On 10/18/2019 2:54 PM, DD5ET wrote:
As seen by these answers so far, there are lots of options. If, like me, you'd prefer to go the kit or pre-built route, there are options from cheap and simple to expensive and more complex.

I personally built the Hi-Per-Mite from Four State QRP: http://www.4sqrp.com/hipermite.php. It's a 200 Hz (fixed bandwidth) CW filter kit that costs $25 delivered and is powered by a 9 volt battery. It can all fit in an Altoids tin or other similarly sized enclosure. I had ordered some jacks and small enclosures (about the size of a deck of cards) for another project and used them for this, too (see photo -- Altoids tin is for size reference -- email me for parts sources, if interested). As Jerry Gaffke indicated, it's easy to use because it connects between the uBITX and your headphones. And, since it's an external device, it can be used with any radio that has an audio out jack. I've used it with my uBITX and my Xiegu G90 and it works well. Once I add an on/of switch, it'll be complete.



If you want a wider (but still fixed) bandwidth, QRP Guys have a CW filter kit with a 600 Hz bandwidth for only $20: https://qrpguys.com/qrpguys-active-600hz-audio-filter. This kit even comes with on/off and in/out switches and two audio jacks. All you need to supply is an enclosure, if you want one, and a 9 volt battery.

SOTABEAMS has a slightly more expensive DSP audio filter kit (also available pre-built), but it is more flexible because it comes with selectable filter bandwidths: https://www.sotabeams.co.uk/dsp-audio-filter-units-ready-to-use/. Prices start around $60 if bought outside the EU (EU customers pay a 20% VAT).

SOTABEAMS also has their new Wolfwave audio processor, but that is probably overkill and starts at around $300 if bought outside the EU: https://www.sotabeams.co.uk/wolfwave-advanced-audio-processor/.



Virus-free. www.avg.com

Re: cw filters

MadRadioModder
 

Well i don't know about that.  Its good no doubt but you can do just as well with a sotabeam filter or customize one by purchasing the audio shield from PJRC and a teensy and make just about any kind of filter you want at a much lower cost. Worst case you can just use the filter part of the code in the JackAl.


MRM

 


On Oct 17, 2019, at 10:05 AM, Ashhar Farhan <farhanbox@...> wrote:


Nothing beats the jackal board.

On Thu 17 Oct, 2019, 4:50 PM Jerry Gaffke via Groups.Io, <jgaffke=yahoo.com@groups.io> wrote:
Easiest is to add an audio filter of some sort between the phone jack on your uBitx and your headphones.
For most of us, easiest means best.

Strong adjacent signals will cause audio distortion, for this reason somebody looking for the ultimate in performance
will want a separate crystal filter for the uBitx.  This is moderately easy to do, but be prepared to learn about
building crystal filters and how to modify the firmware on your rig.

A discussion of CW filters can be found here:  https://groups.io/g/BITX20/topic/32840565

Jerry, KE7ER



On Thu, Oct 17, 2019 at 08:39 AM, <dgclifford@...> wrote:
I have my basic ubitx working nicely, i just wish the cw filtering was a bit (lot) better.  What is the best way to improve the cw filtering and narrow it down.   Dave c


--

…_. _._

Re: cw filters

DD5ET
 

As seen by these answers so far, there are lots of options. If, like me, you'd prefer to go the kit or pre-built route, there are options from cheap and simple to expensive and more complex.

I personally built the Hi-Per-Mite from Four State QRP: http://www.4sqrp.com/hipermite.php. It's a 200 Hz (fixed bandwidth) CW filter kit that costs $25 delivered and is powered by a 9 volt battery. It can all fit in an Altoids tin or other similarly sized enclosure. I had ordered some jacks and small enclosures (about the size of a deck of cards) for another project and used them for this, too (see photo -- Altoids tin is for size reference -- email me for parts sources, if interested). As Jerry Gaffke indicated, it's easy to use because it connects between the uBITX and your headphones. And, since it's an external device, it can be used with any radio that has an audio out jack. I've used it with my uBITX and my Xiegu G90 and it works well. Once I add an on/of switch, it'll be complete.



If you want a wider (but still fixed) bandwidth, QRP Guys have a CW filter kit with a 600 Hz bandwidth for only $20: https://qrpguys.com/qrpguys-active-600hz-audio-filter. This kit even comes with on/off and in/out switches and two audio jacks. All you need to supply is an enclosure, if you want one, and a 9 volt battery.

SOTABEAMS has a slightly more expensive DSP audio filter kit (also available pre-built), but it is more flexible because it comes with selectable filter bandwidths: https://www.sotabeams.co.uk/dsp-audio-filter-units-ready-to-use/. Prices start around $60 if bought outside the EU (EU customers pay a 20% VAT).

SOTABEAMS also has their new Wolfwave audio processor, but that is probably overkill and starts at around $300 if bought outside the EU: https://www.sotabeams.co.uk/wolfwave-advanced-audio-processor/.