Date   

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


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

Evan Hand
 

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

Again, thank you.
73
Evan
AC9TU


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

Jack, W8TEE
 

Yep, it does. Some idiots read the posts here (e.g., me) and simply cut-and-paste the URL and expect it to work. That's not always the case.

Jack, W8TEE

On Saturday, June 20, 2020, 8:52:45 AM EDT, Art Olson <olson339@...> wrote:


This works


Art N2AJO 


On Jun 20, 2020, at 8:20 AM, Evan Hand <elhandjr@...> wrote:

Jack,
I checked, and HamsKey.com takes you to the current blog from Dr. Lee, so not directly to the KD8CEC software.  There are so many options and features that have been added that I thought going to the start and then working through all the projects would be best.

I do not have a link to all topics, here are a few:
http://www.hamskey.com/2019/04/release-cec-firmware-v1200-for-ubitx.html
http://www.hamskey.com/2018/08/ubitx-firmware-cec-version-1097beta.html
http://www.hamskey.com/2018/
http://www.hamskey.com/2018/04/how-to-connect-sdr-rtl-sdr-to-ubitx-and.html

If you mean that the text is not a link, then here is the actual link:
http://www.hamskey.com/

I apologize for any confusion and thank you for the question.
73
Evan
AC9TU

--
Jack, W8TEE


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

Art Olson
 

This works


Art N2AJO 


On Jun 20, 2020, at 8:20 AM, Evan Hand <elhandjr@...> wrote:

Jack,
I checked, and HamsKey.com takes you to the current blog from Dr. Lee, so not directly to the KD8CEC software.  There are so many options and features that have been added that I thought going to the start and then working through all the projects would be best.

I do not have a link to all topics, here are a few:
http://www.hamskey.com/2019/04/release-cec-firmware-v1200-for-ubitx.html
http://www.hamskey.com/2018/08/ubitx-firmware-cec-version-1097beta.html
http://www.hamskey.com/2018/
http://www.hamskey.com/2018/04/how-to-connect-sdr-rtl-sdr-to-ubitx-and.html

If you mean that the text is not a link, then here is the actual link:
http://www.hamskey.com/

I apologize for any confusion and thank you for the question.
73
Evan
AC9TU


Re: Characterized my new v6

Ashhar Farhan
 

You dont have enough attenuation for proper measurement. The fundamental as fed into the spectrum analyser should be -30bdm. Which would indicate about 70 db of attenuation. 
Stronger signals can easily overload the spectrum analyzer leading to second order distortions (harmonics).
- f

On Sat 20 Jun, 2020, 5:25 PM Raj vu2zap, <rajendrakumargg@...> wrote:
Try reducing power by a watt or two and see. If the harmonics drop significantly then I'd say the PA
is being over driven a bit.

The power you are getting at the low bands is less than I would expect and power at high end (10M) is higher
than my expectation.

An external 30MHz LP Filter should help.

Raj

At 20/06/2020, you wrote:
I did some baseline measurements on my new V6 running Reed's FW before I start changing too many things.
The power's a good bit lower than expected and the third harmonics on both 15m and 30m are 4-5 dB over.

I've seen other references to low power, but I didn't notice anyone reporting issues with the third harmonic on 15/30m.
Not sure what I'll do about it yet.

John
K6JDS




Measurements are with 40dB attenuation before the SA with the ubitx in CW.
The SA is a fairly decent Agilent unit.
 


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

Evan Hand
 

Jack,
I checked, and HamsKey.com takes you to the current blog from Dr. Lee, so not directly to the KD8CEC software.  There are so many options and features that have been added that I thought going to the start and then working through all the projects would be best.

I do not have a link to all topics, here are a few:
http://www.hamskey.com/2019/04/release-cec-firmware-v1200-for-ubitx.html
http://www.hamskey.com/2018/08/ubitx-firmware-cec-version-1097beta.html
http://www.hamskey.com/2018/
http://www.hamskey.com/2018/04/how-to-connect-sdr-rtl-sdr-to-ubitx-and.html

If you mean that the text is not a link, then here is the actual link:
http://www.hamskey.com/

I apologize for any confusion and thank you for the question.
73
Evan
AC9TU


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

Jack, W8TEE
 

Bad URL??

Jack, W8TEE

On Saturday, June 20, 2020, 7:31:08 AM EDT, Evan Hand <elhandjr@...> wrote:


Freeing up the code space that is required for the stock display allows for more features to be implemented.  The KD8CEC software also allows additional controllers to be added for things like spectra scopes, second displays, CW decoding, and others.  There is also an S meter addition that uses the spare A7 pin on the Nano.  Dr. Lee has also built an SDR interface into the KD8CEC software that allows you to connect an RTL-SDR like radio to the IF of the ubitx and manage it through the PC memory manager software that he also wrote.

It is a powerful ecosystem for the ubitx.  I would encourage you to look through his blog at HamsKey.com

My opinions, yours may differ.
73
Evan
AC9TU

--
Jack, W8TEE


Re: Characterized my new v6

 

Try reducing power by a watt or two and see. If the harmonics drop significantly then I'd say the PA
is being over driven a bit.

The power you are getting at the low bands is less than I would expect and power at high end (10M) is higher
than my expectation.

An external 30MHz LP Filter should help.

Raj


At 20/06/2020, you wrote:
I did some baseline measurements on my new V6 running Reed's FW before I start changing too many things.
The power's a good bit lower than expected and the third harmonics on both 15m and 30m are 4-5 dB over.

I've seen other references to low power, but I didn't notice anyone reporting issues with the third harmonic on 15/30m.
Not sure what I'll do about it yet.

John
K6JDS


[]

Measurements are with 40dB attenuation before the SA with the ubitx in CW.
The SA is a fairly decent Agilent unit.
[]  


Re: "sketchy"

@KF4ZGZ
 

The hex I loaded was the one Reed posted in message # 75440.
I still have the stock screen and it works fine.
My next step it to get a better mic going ..... just waiting on plugs to arrive.
After that. I'm going to add a new screen. I'm going to go with the biggest that will fit in the
full kit box without hacking out the box ..... and see where happens from there.


Characterized my new v6

 

I did some baseline measurements on my new V6 running Reed's FW before I start changing too many things.
The power's a good bit lower than expected and the third harmonics on both 15m and 30m are 4-5 dB over.

I've seen other references to low power, but I didn't notice anyone reporting issues with the third harmonic on 15/30m.
Not sure what I'll do about it yet.

John
K6JDS




Measurements are with 40dB attenuation before the SA with the ubitx in CW.
The SA is a fairly decent Agilent unit.


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

Evan Hand
 

Freeing up the code space that is required for the stock display allows for more features to be implemented.  The KD8CEC software also allows additional controllers to be added for things like spectra scopes, second displays, CW decoding, and others.  There is also an S meter addition that uses the spare A7 pin on the Nano.  Dr. Lee has also built an SDR interface into the KD8CEC software that allows you to connect an RTL-SDR like radio to the IF of the ubitx and manage it through the PC memory manager software that he also wrote.

It is a powerful ecosystem for the ubitx.  I would encourage you to look through his blog at HamsKey.com

My opinions, yours may differ.
73
Evan
AC9TU