Date   
Re: Audio - R63 mod v2.0

Sajid Rahum
 

i went ahead and mod'ed it with 10ohm in parallel.  Improvement is there; i dont need to shout loud.

Best thing is to get the 70w/ssb kit going.

Updated to a larger Nextion screen

Ian Reeve
 

I have a V4 board with KD8CEC software on the Arduino and a 2.8" Nextion screen.
This has been working well but I wished to have a larger screen as the case can accomodate a 3.5" one.
Having purchased a Nextion standard (not enhanced) 3.5" screen, I proceeded to download and install via micro sd card,the KN4UD 3.5" tft image as shown on the ubitx.net web pages.
The file loaded and after removing the micro sd card and rebooting the display, got a perfect screen which looked complete.
On connecting to the arduino in the rig using the same 4 wires the various field are not populated.
Clearly I must be missing some thing else that needs to be done.
Plugging the original display back in results in all the info being displayed.
May I have your thoughts
The version is 1.097
Many Thanks
Ian M0IDR

Re: ubitx 2.0 - Mic cannot get to TX

Sajid Rahum
 

mic:
Updated the R63 with a 10ohm in parallel.  at least no need to shout for now.  will try next to improve the mic with a compressor/amp replacing the speaker in the case.

Re: Updated to a larger Nextion screen

Mark Hatch
 

Hi, 

Assuming you didn't mess up the blue and yellow wires... perhaps a mismatch between Nextion screen versions and KD8CEC?

Believe the current release s 1.2 (or 1.1+)?

73
Mark

Re: Microphone audio leaking into speaker

Jay - WS4JM
 

I have found a work around, I had previously added a relay to key an external amplifier. I used one of the original relays that I replaced with the Axicom relay. I put the audio line on the unused half of the relay's NC contact and switched out the audio. Success!

Next step is to add a bypass switch to restore the CW side tone.

Thanks to all who offered suggestions

WS4JM
Jay

Re: Wanted

Balasubramanyan Cp
 

Anybody can help me in purchasing USED TUNER low power working type  (upto 100 Watts) ?  Email  bsnvu2yc73s@...


On Thu, Jun 6, 2019 at 7:39 PM iz oos <and2oosiz2@...> wrote:

The ubitx might scare the majority... being too educational. There are by the way really good (low phase noise, good blocking etc) and durable transceivers, like the IC-765. Of course I would vote for the ubitx, but consider the 'hey teacher we don't need education' .


Il 06/giu/2019 08:51, "Balasubramanyan Cp" <bsnvu2yc73s@...> ha scritto:
Dear CLUB MEMBERS/OM/YL,
Why not to get uBITX VERSION 5 LSB & CW MULTIBAND 10W QRP from OM Farhan, INDIA ?  It is very very very good IN ALL RESPECT !!!!!!
73s.  Email bsnvu2yc73s@....


On Wed, Jun 5, 2019 at 8:55 PM Adrian Chadd <adrian@...> wrote:
Yeah, hit me up. I'm local to you (east oakland) and can help you get
a HF transceiver.



-adrian

On Wed, 5 Jun 2019 at 10:38, Martin KM6TCD <peaceofandalus@...> wrote:
>
> Our club is looking for a built, tested, and working transceiver.
>
> Anyone got one they might sell?
>
> km6tcd
>



Re: Nextion 5/Enhanced for KD8CEC 1.2?

Mark Hatch
 

Never mind. It was an easy photoshop change. All done!

More screens to do....

73
Mark

no audio

Sam Tedesco
 

Hi everyone. It's that time again.... Opened sunil case w/ v4 board to add audio amp. Removed audio pin 7 to the front input board and brought audio to amp from d16. Hooked internal speaker to amp and it worked great. Added front audio input and got buzzing/oscillations over audio. Turned off, removed front input, turned on, no audio. Took everything off amp and put audio back to board...nothing. changed q71, 72, and 73...nothing. Any ideas?? Thanks 

Re: no audio

 

Not too clear what you did as I have not used Sunils case.

Sometimes the culprit in such case is the EP socket. Some plugs have a different tip shape and may damage the contact
inside the socket. If you used an external speaker through EP socket then check that.

Raj

At 07-06-19, you wrote:
Hi everyone. It's that time again.... Opened sunil case w/ v4 board to add audio amp. Removed audio pin 7 to the front input board and brought audio to amp from d16. Hooked internal speaker to amp and it worked great. Added front audio input and got buzzing/oscillations over audio. Turned off, removed front input, turned on, no audio. Took everything off amp and put audio back to board...nothing. changed q71, 72, and 73...nothing. Any ideas?? Thanks

Re: 24 volt

Mark Hatch
 

Found the reference....  WA2EBY.  Take a look at:

http://www.golddredgervideo.com/kc0wox/wa2ebyamp/  (pointer to availability of boards) and http://diycrap.blogspot.com/2016/06/wa2eby-irf510-amplifier.html and http://kit-projects.com/AMP.en-us.htm

Although I am already committed to the  ebay cheap amp, (nice construction with pointers to heat sync etc. at http://pa-11019.blogspot.com/2016/11/diy-kits-70w-ssb-linear-hf-power.html. ) certainly tempted to look at. WA2EBY...

73
Mark

Re: Updated to a larger Nextion screen

Ian Reeve
 

Hi Mark,  Thx very much for your reply.Double checked everything and still no joy.The 4 pin connector as supplied with the screen was used and delivered power to the display but the blue wire had been crimped over the insulation and was not making contact.Indeed a gentle pull on the blue wire separated it from the connector.so problem solved.Thx and ,73. Ian M0IDR


From: BITX20@groups.io <BITX20@groups.io> on behalf of Mark Hatch <mark2382@...>
Sent: Thursday, June 6, 2019 10:02:45 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Updated to a larger Nextion screen
 
Hi, 

Assuming you didn't mess up the blue and yellow wires... perhaps a mismatch between Nextion screen versions and KD8CEC?

Believe the current release s 1.2 (or 1.1+)?

73
Mark

Re: 24 volt

 

The WA2EBY is a great little qrp amp. I built one and love it, finding some of the boards might be tough but its a great amp.

 

Try Taydaelectronics for a Fan the sell some nice little ones I use for Pi's. https://www.taydaelectronics.com/electromechanical/dc-fan.html
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: no audio

 

What type of amp are you using. I remember using a type-d with my sota beams filter and needed to keep the GND isolated from radio/earth gnd.

Maybe try the audio jack when its not attached to the case and see if it works if so you know.
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: no audio

Sam Tedesco
 

David and Raj, thanks. I already tried both of your suggestions. I'm using Sunil's audio amp. I removed the amp and reverted to just the standard ubitx setup, and I have no audio... even at the pre-amp stage. I'm stumped...

Re: no audio

Mark Hatch
 

I assume those front panel jacks are not grounding to the case?  The early (smaller) Sunil cases attached the bottom handle right under that front board and it would ground out. I had to get my dremel out and then some electrical tapes to isolate these points from the front board.

BTW: I "think" i blew the standard audio push/pull transistor set q72/q73 when trying to install the amp. I replaced them both and never tried installing the amp again. So no certainly not confirmed that I didn't do something else wrong.

73
Mark

Re: no audio

Joe Puma
 

I dremeled and grounded all metal contacts to the front case. 



On Jun 7, 2019, at 11:18 AM, Mark Hatch <mark2382@...> wrote:

I assume those front panel jacks are not grounding to the case?  The early (smaller) Sunil cases attached the bottom handle right under that front board and it would ground out. I had to get my dremel out and then some electrical tapes to isolate these points from the front board.

BTW: I "think" i blew the standard audio push/pull transistor set q72/q73 when trying to install the amp. I replaced them both and never tried installing the amp again. So no certainly not confirmed that I didn't do something else wrong.

73
Mark

Re: 24 volt

Gary Anderson
 

Vaughn,
A brush-less fan is normally low on radiated EMI and is more likely problematic on conducted EMI (e.g. EMI current in the power and ground wires) There can be EMI radiated from the power / ground wires too, just like any signal wire.


I would suggest running the fan from an isolated / separate power supply (e.g. wall wart), with fan wiring away from your BITX40, and see if the "RF noise" persists.
  If you are happy with the results, than discuss build options.  How the fan is physically wired, ways to filter.  In the case that the EMI affects RX quality, but not TX quality: one possible solution is to just power the fan on transmit, which would be fine if your total thermal solution can handle 100% TX duty cycle.

Simple filtering schemes have a series resistor on both power and ground close to the fan and a capacitor (or numerous capacitors of different decade values in parallel)  electrically shunted across the fan.

Regards,
Gary

Re: 24 volt

ajparent1/KB1GMX <kb1gmx@...>
 

N8DAH,

Boards are easy for the EBY amp.  FARCircuits has them.

Its a good design and allwos for getting good performance at higher frequencies.
Mine with a little effort does 37W on 10M (1.8W drive) and with the same drive at 
40M about 55W.  80 and 20 are about 50.  Never though to try 15 or 17m but
I'd expect about 44w.  The 1.8W is because I use an attenuator at the amp input
as most of my HB radios do 4W which is excessive power or the amp.
FYI I run it at 28V.

It is a good amp mine is now 13 years old and still running the same set of IRF510s.
I did use a large heatsink (4x8" with 1" fins and the base thickness was .300").  
Some call it overkill but no fan with a brick on the key for 10 minutes is easy.

At least one of the "70W DIY AMP" I've seen did do that power for about 1 minute
into a dummy load before it  blew up.  Likely self oscillation or overheat the
supplied heatsink was maybe pentium II vintage  with mounting points for
a fan and not at all large or highly finned.

Allison

Re: 24 volt

MVS Sarma
 

Even Sunil vu3sua sells set of pcbs for EBY . BLACK MASKED PCBS.


On Fri, 7 Jun 2019, 9:43 pm ajparent1/KB1GMX <kb1gmx@... wrote:
N8DAH,

Boards are easy for the EBY amp.  FARCircuits has them.

Its a good design and allwos for getting good performance at higher frequencies.
Mine with a little effort does 37W on 10M (1.8W drive) and with the same drive at 
40M about 55W.  80 and 20 are about 50.  Never though to try 15 or 17m but
I'd expect about 44w.  The 1.8W is because I use an attenuator at the amp input
as most of my HB radios do 4W which is excessive power or the amp.
FYI I run it at 28V.

It is a good amp mine is now 13 years old and still running the same set of IRF510s.
I did use a large heatsink (4x8" with 1" fins and the base thickness was .300").  
Some call it overkill but no fan with a brick on the key for 10 minutes is easy.

At least one of the "70W DIY AMP" I've seen did do that power for about 1 minute
into a dummy load before it  blew up.  Likely self oscillation or overheat the
supplied heatsink was maybe pentium II vintage  with mounting points for
a fan and not at all large or highly finned.

Allison

Re: 24 volt

MVS Sarma
 


On Fri, 7 Jun 2019, 10:28 pm MVS Sarma via Groups.Io <mvssarma=gmail.com@groups.io wrote:
Even Sunil vu3sua sells set of pcbs for EBY . BLACK MASKED PCBS.

On Fri, 7 Jun 2019, 9:43 pm ajparent1/KB1GMX <kb1gmx@... wrote:
N8DAH,

Boards are easy for the EBY amp.  FARCircuits has them.

Its a good design and allwos for getting good performance at higher frequencies.
Mine with a little effort does 37W on 10M (1.8W drive) and with the same drive at 
40M about 55W.  80 and 20 are about 50.  Never though to try 15 or 17m but
I'd expect about 44w.  The 1.8W is because I use an attenuator at the amp input
as most of my HB radios do 4W which is excessive power or the amp.
FYI I run it at 28V.

It is a good amp mine is now 13 years old and still running the same set of IRF510s.
I did use a large heatsink (4x8" with 1" fins and the base thickness was .300").  
Some call it overkill but no fan with a brick on the key for 10 minutes is easy.

At least one of the "70W DIY AMP" I've seen did do that power for about 1 minute
into a dummy load before it  blew up.  Likely self oscillation or overheat the
supplied heatsink was maybe pentium II vintage  with mounting points for
a fan and not at all large or highly finned.

Allison