Date   

Re: has the supply chain for the uBITX been affected by the covid-19

Alex
 

I recieved mine with only 3 days shipping time using DHL. That was about 10 days ago.

Alex

WD2T


Re: A long long video on building feedback amplifiers

Gordon Gibby
 

Thanks!!


On Jun 20, 2020, at 11:20, Ashhar Farhan <farhanbox@...> wrote:


Gang,
I have recorded a video on how to build feedback amplifiers. It is little long. Do take a look if you are into homebrewing. I explain what a feedback amplifier is, how to choose the component values, how to build it and how to measure all the aspects like gain, input and output impedances and IIP3.
- f


Re: RFI on 2 meters from uBitx

Jay - WS4JM
 

Update,

I put a couple small ferrites I brought home from work, and the interference was reduced markedly with 3 turns through the ferrites. I will have to add wire to the power leads to get a few more wraps and I believe that this should solve my issues. Thanks to everyone who offered advice, and I hope to catch you on the air. I try to be on 7.277 around sunset on Sunday evenings.

73 de WS4JM
Jay


Re: Characterized my new v6

Dexter N Muir
 

As Sir Terry Pratchett's Discworld "Hex" thinking engine would say (in
cursive script): + + + Re-do from start  + + +

I rather like Discworld: it has an oddball similarity to the world of
Electronics (and Ham Radio!), its own sort-of logic, comprehensible to
those akin to Ponder Stibbons.

73 de ZL2DEX :)


Re: ANTUINO antenna analzer CERTAIN CLARIFICATIONS REG

iz oos
 

I would try with a coax choke at the antenna feedpoint and then measure it with Antuino. I would not be too obsessed to find a 1:1 swr unless your transceiver lowers automatically the power output to protect its finals.


Il 20/giu/2020 16:59, "LAKSH MUTHU" <vu2lmn@...> ha scritto:
DEAR ALL,
        Thank you all for the guiding replies.
Dear Peter, you have given a detailed elucidation. You have pointed out that the probability of an extra resonance in the middle, coming from one arm of the 40m dipole and an opposite arm of the 20m dipole resonating together.In this connection, I am to give my present observation. When I make a short test transmission in LSB mode on 40 m band, there is heavy (RF) feed back. I think this reinforces your finding of the resonating  of  opposite arms together. Am I correct? Dear Peter, Please through some light on this. . Tomorrow, I will change the lengths and position of arms and try again.
     Thanks a million once again
                        73
      MUTHU   VU2LMN


Re: Sketch too big

Bill Cromwell
 

Hi,

I have 8.1.9 and I compiled/installed with that.

73,

Bill KU8H

bark less - wag more

On 6/20/20 3:58 PM, joe@... wrote:
when compiling code for a V6 from https://github.com/reedbn/ubitxv6/ I received this error message
Arduino: 1.8.13 (Windows 10), Board: "Arduino Nano, ATmega328P"
Sketch uses 30750 bytes (100%) of program storage space. Maximum is 30720 bytes.text section exceeds available space in board
Global variables use 819 bytes (39%) of dynamic memory, leaving 1229 bytes for local variables. Maximum is 2048 bytes.
Sketch too big; see http://www.arduino.cc/en/Guide/Troubleshooting#size for tips on reducing it.
Error compiling for board Arduino Nano.
I thought I read this code would fit a V6 kit
option enabled in File -> Preferences.


Re: Sketch too big

W2CTX
 

I too got same as you Jack with 1.8.12.
So I loaded 1.8.13 and it does give too large error!

rOn

On Saturday, June 20, 2020, 4:10:08 PM EDT, Jack, W8TEE via groups.io <jjpurdum@...> wrote:


I just compiled it to 30316 bytes just fine. However, I'm using release 1.8.12.

Jack, W8TEE

On Saturday, June 20, 2020, 3:58:57 PM EDT, joe@... <joe@...> wrote:


when compiling code for a V6 from https://github.com/reedbn/ubitxv6/ I received this error message

Arduino: 1.8.13 (Windows 10), Board: "Arduino Nano, ATmega328P"
Sketch uses 30750 bytes (100%) of program storage space. Maximum is 30720 bytes.text section exceeds available space in board
Global variables use 819 bytes (39%) of dynamic memory, leaving 1229 bytes for local variables. Maximum is 2048 bytes.
Sketch too big; see http://www.arduino.cc/en/Guide/Troubleshooting#size for tips on reducing it.
Error compiling for board Arduino Nano.

I thought I read this code would fit a V6 kit




option enabled in File -> Preferences.

--
Jack, W8TEE


Re: Sketch too big

Jack, W8TEE
 

I just compiled it to 30316 bytes just fine. However, I'm using release 1.8.12.

Jack, W8TEE

On Saturday, June 20, 2020, 3:58:57 PM EDT, joe@... <joe@...> wrote:


when compiling code for a V6 from https://github.com/reedbn/ubitxv6/ I received this error message

Arduino: 1.8.13 (Windows 10), Board: "Arduino Nano, ATmega328P"
Sketch uses 30750 bytes (100%) of program storage space. Maximum is 30720 bytes.text section exceeds available space in board
Global variables use 819 bytes (39%) of dynamic memory, leaving 1229 bytes for local variables. Maximum is 2048 bytes.
Sketch too big; see http://www.arduino.cc/en/Guide/Troubleshooting#size for tips on reducing it.
Error compiling for board Arduino Nano.

I thought I read this code would fit a V6 kit




option enabled in File -> Preferences.

--
Jack, W8TEE


Sketch too big

joe@...
 

when compiling code for a V6 from https://github.com/reedbn/ubitxv6/ I received this error message

Arduino: 1.8.13 (Windows 10), Board: "Arduino Nano, ATmega328P"
Sketch uses 30750 bytes (100%) of program storage space. Maximum is 30720 bytes.text section exceeds available space in board
Global variables use 819 bytes (39%) of dynamic memory, leaving 1229 bytes for local variables. Maximum is 2048 bytes.
Sketch too big; see http://www.arduino.cc/en/Guide/Troubleshooting#size for tips on reducing it.
Error compiling for board Arduino Nano.

I thought I read this code would fit a V6 kit




option enabled in File -> Preferences.


Re: [GCBG] A few good Beta Readers needed...

Jack, W8TEE
 

All:

Thank you for the response. I think I have enough people who have expressed interest to accomplish the Beta read program. I'll be going through them today and tomorrow and will let the Beta's know no later than Monday evening.

Thanks again!

Jack, W8TEE

On Saturday, June 20, 2020, 12:48:17 PM EDT, jjpurdum via groups.io <jjpurdum@...> wrote:


All:

I'm writing a new beginning C book titled Beginning C for Microcontrollers. It will be similar to my existing Beginning C for Arduino (see Amazon.com), but also includes code for the Teensy 4.0, STM32, and ESP32 microcontrollers as well as the Arduino family. All of them can be programmed in the same Arduino IDE.

Who I'm looking for.

Ideally, I would really like to get readers who don't know any programming at all...zero. Those people come in without preconceived notions and don't have to "unlearn" anything. Also, I have my own way of teaching programming and it is probably unlike how others teach it.

How the Beta program will work.

I currently have 10 of the 14 chapters written. (See the attached TOC.) I will select about 6-10 Beta readers. Once that is done, I will send out the first two chapters. (The first chapter is the usual intro and getting the software and patches installed.) When I receive your comments on those chapters, I will send you the next chapter. I would really like to get the comments back within a week or so (...I'm old and you never know!) After the chapter comments come in, I'll send you the next chapter and wait for your comments. We will repeat until done. Anyone who doesn't submit some chapter comments, or takes longer than I hope for to submit those comments, will be dropped from the program.

How do I get paid?

You don't...I can't afford to! I honestly believe that, if you complete the Beta read, you will be able to read and write your own C programs for the microcontrollers mentioned. Only you can decide if that's worth the effort.

If you're interested...

Send me an email at jack52443@... with the tag line "Beta Reader". Just write a couple of sentences confirming that you have no real programming experience and that you have time to finish the program.

Please excuse the bandwidth pollution, but I'd really like some feedback before the book's content is etched in stone.

Thanks!

Jack, W8TEE

--
Jack, W8TEE


A few good Beta Readers needed...

Jack, W8TEE
 

All:

I'm writing a new beginning C book titled Beginning C for Microcontrollers. It will be similar to my existing Beginning C for Arduino (see Amazon.com), but also includes code for the Teensy 4.0, STM32, and ESP32 microcontrollers as well as the Arduino family. All of them can be programmed in the same Arduino IDE.

Who I'm looking for.

Ideally, I would really like to get readers who don't know any programming at all...zero. Those people come in without preconceived notions and don't have to "unlearn" anything. Also, I have my own way of teaching programming and it is probably unlike how others teach it.

How the Beta program will work.

I currently have 10 of the 14 chapters written. (See the attached TOC.) I will select about 6-10 Beta readers. Once that is done, I will send out the first two chapters. (The first chapter is the usual intro and getting the software and patches installed.) When I receive your comments on those chapters, I will send you the next chapter. I would really like to get the comments back within a week or so (...I'm old and you never know!) After the chapter comments come in, I'll send you the next chapter and wait for your comments. We will repeat until done. Anyone who doesn't submit some chapter comments, or takes longer than I hope for to submit those comments, will be dropped from the program.

How do I get paid?

You don't...I can't afford to! I honestly believe that, if you complete the Beta read, you will be able to read and write your own C programs for the microcontrollers mentioned. Only you can decide if that's worth the effort.

If you're interested...

Send me an email at jack52443@... with the tag line "Beta Reader". Just write a couple of sentences confirming that you have no real programming experience and that you have time to finish the program.

Please excuse the bandwidth pollution, but I'd really like some feedback before the book's content is etched in stone.

Thanks!

Jack, W8TEE

--
Jack, W8TEE


has the supply chain for the uBITX been affected by the covid-19

John KG9DK
 

I am thinking about ordering the latest version of the uBITX and wondering if there has been any delay in shipping???  

john kg9dk


A long long video on building feedback amplifiers

Ashhar Farhan
 

Gang,
I have recorded a video on how to build feedback amplifiers. It is little long. Do take a look if you are into homebrewing. I explain what a feedback amplifier is, how to choose the component values, how to build it and how to measure all the aspects like gain, input and output impedances and IIP3.
- f


Re: ANTUINO antenna analzer CERTAIN CLARIFICATIONS REG

LAKSH MUTHU
 

DEAR ALL,
        Thank you all for the guiding replies.
Dear Peter, you have given a detailed elucidation. You have pointed out that the probability of an extra resonance in the middle, coming from one arm of the 40m dipole and an opposite arm of the 20m dipole resonating together.In this connection, I am to give my present observation. When I make a short test transmission in LSB mode on 40 m band, there is heavy (RF) feed back. I think this reinforces your finding of the resonating  of  opposite arms together. Am I correct? Dear Peter, Please through some light on this. . Tomorrow, I will change the lengths and position of arms and try again.
     Thanks a million once again
                        73
      MUTHU   VU2LMN


Re: Nextion standard vs advanced displays #nextion #2meters

Mike WA0YCN
 

Dr. Lee’s implementation is excellent.  I have implemented nearly all the options/features - I consider it making my uBitx a “QRP 7300.”
--
Mike
WA0YCN


Re: Characterized my new v6

Evan Hand
 

Is it not possible to verify the distortion of the SA input with a step attenuation on the input?  Drop the input by some amount (like 3 or 6 db) and verify that all signals are reduced by the same amount.  If all drop, then the input is not distorting.

Please let me know if this test is not valid, still somewhat new to SA use.
73
Evan
AC9TU


Re: Characterized my new v6

Evan Hand
 

Allison,
The test was in CW mode, so the audio drive is not the issue.  I believe that Raj was talking about the RV1 adjustment to lower the drive to the finals.

Highest Regards,
73
Evan
AC9TU


Re: Characterized my new v6

ajparent1/kb1gmx <kb1gmx@...>
 

I'm with Raj,

Overdrive the audio and the output gets dirty fast.   Drop the audio in small
steps and if the harmonics drop faster its over drive.

Allison
---------------------------------
No direct email, it goes to bit bucket due address harvesting in groups.IO


Re: Characterized my new v6

ajparent1/kb1gmx <kb1gmx@...>
 

Farhan,

Depends on the SA, the rigol and HP units I ahve that can be as high as 5 dbm
for the rigol and 10dbm (with out attenuator on the HP8568B.

You want to have the strongest signal near the base line (usually 0DBM)
so you can see the maximum useable dynamic range.

For others it can be lower but TX fundemental needs to be attenutated any
way as watts at the input  would kill most SAs.


Allison
---------------------------------
No direct email, it goes to bit bucket due address harvesting in groups.IO


Re: Nextion standard vs advanced displays #nextion #2meters

Jack, W8TEE
 

Not a problem, Evan. I've been to Ian's site numerous times (he asked me to prepare a slide presentation on writing functions for his students in Korea, hence the many visits). I just forgot to prefix the URL as is sometimes needed.

Jack, W8TEE

On Saturday, June 20, 2020, 9:07:19 AM EDT, Evan Hand <elhandjr@...> wrote:


Jack,
No Problem.  I always appreciate any feedback, especially from experts like yourself.

Again, thank you.
73
Evan
AC9TU

--
Jack, W8TEE