Date   
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

Re: Updated to a larger Nextion screen

Mark Hatch
 

Love solutions like this!  Usually, i blow a transistor or something. :-)

73
Mark

Re: [JackAl] JackAl & uBITX for sale

Jack, W8TEE
 

Neither. Is a touch screen display and board that adds a bunch of features to the µBITX. Here's a copy of ours:

Inline image

Its features include:

5” or 7” TFT Touch Screen 800x480 TFT Color Display
Dual VFO
RIT
S Meter
Real Time Clock (add optional battery)
50 CW Preset Messages, selectable at runtime
Touch Screen Band Selection
Touch Screen Buttons for function selection and control
Dual Encoders: Frequency Tuning, ALS Tuning, Program Input
Frequency Tuning: Standard and ALS Tuning
ALS Tuning: Special tuning using the second encoder. If the frequency increment is set to 1KHz,
    ALS Tuning sets the second encoder to one-tenth the increment of the primary tuning
    rate. This allows for rapid tuning to an approximate frequency using the main encoder
    and then using ALS Tuning with the second encoder to fine tune the signal.
Filter Selection:
    CW presets (3dB bandwidth): 150 Hz, 300 Hz, 400 Hz, 600 Hz
    SSB presets (3dB bandwidth): 1500 Hz, 1800 Hz , 2200 Hz, 3000 Hz
EEprom storage of user preferences and CW code presets
3 external hardware buttons for CW code messages (e.g., contest exchanges)
Based on Teensy 3.6 Microcontroller with Audio Shield
Hardware AGC using IF take-off
Mic Compressor with adjustable threshold
Mic 8-band equalization
Receive Audio Filter
48 dB/octave (8 pole equivalent DSP filters)
2 Variable bandwidth filters – user defined knee frequencies with Rotary Encoder control
Audio AGC with adjustable threshold
Variable Notch filter, encoder adjustable, use specified Q
CW code to Text converter
Code Practice Oscillator Mode
About a dozen I/O pins to play with plus 800K of free flash memory, 200K of free SRAM, all clocked at 180MHz

Jack, W8TEE


On Friday, June 7, 2019, 1:12:43 PM EDT, tmize57@... <tmize57@...> wrote:


For those of us that are not up on versions and models can you provide pictures and a description?  Is this the Antenna Analyzer or QRP transceiver?
Thanks
Tim N7XAU

Re: 24 volt

 

That is where I got mine last I check though he was out of them. The one I made was overkill on the Heatsink as well, I did end up putting in the T-Pad so I could use 5W drive. It was a nice project and fun to build/use. I am running mine at 24v since I couldn't find a good solution to a nice 28v supply.
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: Updated to a larger Nextion screen

Ian Reeve
 

Cheers Mark as an aside I have read that the 7805 regulator on the arduino gets rather warm in use.Without a Heatsink it does indeed but a modest Heatsink designed for such devices keeps the device nicely cool.A reduced supply to it instead of the 12 volts would do equally well but more difficult to implement than a screw fixed Heatsinks.  73. Ian


From: BITX20@groups.io <BITX20@groups.io> on behalf of Mark Hatch <mark2382@...>
Sent: Friday, June 7, 2019 6:12:26 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Updated to a larger Nextion screen
 
Love solutions like this!  Usually, i blow a transistor or something. :-)

73
Mark

V5 audio Help !

chuckr@hostu.org
 

Hi all , got my new V5 all together and all looked, good. The audio when cranked near full would about run you out of the room. So started the calibration and bfo routine and after that all seemed to work fine,So then a day or so later turned the radio on and no  audio!  Crank all the way up and you can hear but  not enough to work with, on a scale of 10 audio went from 10 to 1 or 1.5. Changed the lm386 out twice to no avail.  If anyone can direct me in the right direction or give their guess and any and all help appreciated .
thanks
chuck  73

Re: no audio

Sam Tedesco
 

I tried isolating the amp only. Nothing. I tried a radio shack amplified speaker on just the audio section of the main board...pre and post amp. Nothing. I tried isolating only the front panel. Nothing. Receive is gone. ???

Re: no audio

Arv Evans
 

Sam

Difficult to troubleshoot remotely without more information, but if there is no local
oscillator signal into the BFO mixer there would be no audio output from that stage. 
You might connect your external audio amplifier to the output of the BFO mixer to
see if there is audio there.  The level will be low, but audio should be heard on
strong signals. 

Arv
_._


On Fri, Jun 7, 2019 at 1:38 PM Sam Tedesco <stedesco619@...> wrote:
I tried isolating the amp only. Nothing. I tried a radio shack amplified speaker on just the audio section of the main board...pre and post amp. Nothing. I tried isolating only the front panel. Nothing. Receive is gone. ???

Re: Nextion 5/Enhanced for KD8CEC 1.2?

JT Croteau
 

Mark, please share your ESP32 circuit when ready.  Thanks


On Fri, May 31, 2019, 00:28 Mark Hatch <mark2382@...> wrote:
Jack (of JackAl fame), suggested that I might look at replacing that standalone signal analyzer Nano with a ESP32. At $10 for amazon prime for 250mhz + 1.3mb flash and Arduino IDE compatible.... Well, being delivered tomorrow. :-) Yet another project to learn from. :-)

73
Mark
AJ6CU

BTW: Now got horizontal and vertical scaling of spectrum analyzer working on 5". Lots of cosmetics yet....