Date   
Re: On the subject of fake IRF510

 

Jerry,

The RD16HHF1 is designed for 12.5V, so running at higher voltage is guarantee magic smoke with projectiles!

They have 70 and 100W versions for HF @ 12.5 volts. Maybe worth experimenting!

Raj

At 16-07-2017, you wrote:
I considered moving from the IRF510 to the RD16HHF1.
In a TO-220, better heat dissipation, tab is tied to source pin.
Designed specifically for RF service at Bitx40 power levels.
Only 10x the price of an IRF510.

However:
Pins are swapped around a bit from the IRF510, though that's easy enough to accommodate.
Vds max of 50v, vs 100v for the IRF510.
Threshold voltage might be higher than the IRF510, though probably within range for the Bitx40's RV1.

Re: W8TEE TFT/ VFO DISPLAY BOARD BOARD

Art Olson
 

Jack

Duh. What's your phrase?  I had a double flat forehead moment. Again thanks for you help and patience 

Art

Sent from my iPhone

On Jul 16, 2017, at 10:14 PM, Jack Purdum via Groups.Io <econjack@...> wrote:

No, that's not what's needed. If you want to read the voltage, you need to pass your supply voltage through a dropping resistor so the voltage doesn't exceed 5V. The end of that resistor is then connected to MYVOLTAGEPIN (A14). The code starting at line 1515 is the block that is responsible for reading that voltage and displaying it on the screen. The Mega should NOT be reading 12V directly on an analog pin. As I said before, this is explain in Rel. 2 of the manual, posted on the group site.

Jack, W8TEE


From: Art Olson <olson339@...>
To: BITX20@groups.io
Sent: Sunday, July 16, 2017 4:50 PM
Subject: Re: [BITX20] W8TEE TFT/ VFO DISPLAY BOARD BOARD

Jack
 
Yes the power pins for the tft/vfo are connected to my supply
 
art
 
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jack Purdum via Groups.Io
Sent: Sunday, July 16, 2017 4:37 PM
To: BITX20@groups.io
Subject: Re: [BITX20] W8TEE TFT/ VFO DISPLAY BOARD BOARD
 
did you connect a line to the voltage pin from your supply?
 
Jack, W8TEE
 

From: Art Olson <olson339@...>
To: BITX20@groups.io
Sent: Sunday, July 16, 2017 4:22 PM
Subject: Re: [BITX20] W8TEE TFT/ VFO DISPLAY BOARD BOARD
 
Jack
 
So after calculating mydividerconstant and recompiling the voltage still floats from 12.2 down to 2.3-2.7. So for now I just commented it out. However it would be great if I can get it to work correctly. Any thoughts
 
Display voltage from my supply (has a digital readout) 12.0v
Voltage at tp3 – 11.6v
 
art
 
 
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jack Purdum via Groups.Io
Sent: Sunday, July 16, 2017 11:06 AM
To: BITX20@groups.io
Subject: Re: [BITX20] W8TEE TFT/ VFO DISPLAY BOARD BOARD
 
Hey, Art...not a problem. The file's only been there a day or two and it will take a while to know it's available. No doubt I'll be posting new versions later on. BTW, my TFT/VFO PCB doesn't have to be used to replace the VFO. It's also a good way to experiment with the Mega 2560 Pro Mini since all of the pins are brought out to header pins, making it easy to attach things for testing. Indeed, you could leave off the support components and use it "stand-alone". I've tried to price it reasonably to encourage you people to experiment with it, to all of our benefit.
 
Jack, W8TEE
 

From: Art Olson <olson339@...>
To: BITX20@groups.io
Sent: Sunday, July 16, 2017 6:56 AM
Subject: Re: [BITX20] W8TEE TFT/ VFO DISPLAY BOARD BOARD
 
Jack
Thanks. Feel a bit foolish for missing the info in the manual
 
Art

Sent from my iPhone

On Jul 15, 2017, at 10:37 PM, Jack Purdum via Groups.Io <econjack@...> wrote:
Art:
 
I'm sure the flicker is because the voltage pin is floating. The code is written so the display updates every 2 seconds, but only if there is a "real" swing in the voltage. You can see the code in loop(), around line 1515. The way to get this to work on the display is explained in the B40 Assembly Manual (Rev. 2) that is in the Files section. Look for "Determining the Displayed Voltage". If you don't want the voltage display activated, just comment out the code block that starts at 1515.
 
Al Peter helped me fix the "encoder noise" is was hearing. Turns out it was a flat forehead mistake on my part. In the process of separating the PA power source from the TFT power source, I managed to introduce a ground loop. Once that was determined it was fairly easy to fix.
 
I'm back onto the other features I want to add.
 
Jack, W8TEE
 

From: Art Olson via Groups.Io <olsonaj6927@...>
To: BITX20@groups.io
Sent: Saturday, July 15, 2017 5:11 PM
Subject: Re: [BITX20] W8TEE TFT/ VFO DISPLAY BOARD BOARD
 
Jack

I must have missed this in the build or setup. The voltage continues to change so it must be floating. I have the tft/vfo connected to the bitx40 power so don't think I have a ground problem. Could you resend the detail about the voltage divider 

"If you connect the display voltage pin to your voltage source, it will flash one or two times at power up, but will only update itself if there is a measurable change in the supply voltage. My guess is that you don't have yours tied to either ground or a voltage divider. As a result, the pin is floating which is read as a new voltage which triggers a screen update.I had mine running several hours last night and it never varied enough to update the field". 

art
 
 
 
Virus-free. www.avast.com
 


Re: Raduino / LCD display

Vince Vielhaber
 

Yeah, they're a pain in the backside to find. They currently have them
with PCBs.
https://www.taydaelectronics.com/pcb/pcb-support-hardware-materials.html
The ones I used are the 6.3mm
https://www.taydaelectronics.com/pcb/pcb-support-hardware-materials/hc-6-6mm-pcb-support-html.html

Vince.

Vince, do you have a link to Tayda for those self stick standoffs? I did a
search on their website that came up with no results. Thanks.

73, Guy N7BIR

Re: BITX echolink node

tom van der meer
 

I'd definitely visit. Let me know when its up. 
73 to all

Re: Drawn Raduino P1 P3 connections

ve7hcw@...
 

Hi Al
     you are correct should be 12 volts on that pin .now I am having difficulty locating that Express PCB file to correct that mistake. will have to  search all the Express PCB files on this computer. getting old at this game , so busy when you retired at 69 !
      wayne      ve7hcw/ va7at

Re: Raduino with Rotary encoder

Jack Purdum <econjack@...>
 

Tell me exactly what you need, as I may already have it or can point you to it. "...it's connection to this..." is confusing to me and I'm not really sure what you need.

Jack, W8TEE



From: Dexter N Muir <dexy@...>
To: BITX20@groups.io
Sent: Monday, July 17, 2017 5:24 AM
Subject: Re: [BITX20] Raduino with Rotary encoder

Jack's two files tell how to connect the *Arduino Nano*, and that is good generic background info. The Nano, however, is linked to the Raduiono PCB for the BITX40 - it's connection to this that would be far more helpful for the newcomer (and for old duffers like me! :) ). Anyone dunnit already who could pass on the info? perhaps a diagram? I doubt it's essential to connect directly to the Nano. A variation on Farhan's wiring diagram/s would be Excellent.
Hopeful ...



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Re: Drawn Raduino P1 P3 connections

ve7hcw@...
 

Hi Al
       You are correct that pin should be 12V.   i have corrected that mistake and post a new drawing.

   wayne VE7HCW

Re: VK3YE Improved audio mod, Using a variable capacitor in place of C102

Pavel Milanes Costa <pavelmc@...>
 

Hi to the group,

I modified a friend's bitx40v3 with this mod already! I consider this a must-do if you has the technical skills/equipment to align it properly.

I was reported on-air to have some USB unintelligible noise, I grabbed my RTL-SDR + homebrew UP-converter, warmed it and calibrated... yes it's as cheap as that, no very expensive spectrum analyzer in use here.

For my experiments the best point to take a signal is from the hot leg of R37, disconnected power from the final stage and hit PTT.

Carrier was about the expected freq but as soon as I begin to speak to the mic the problem was evident, carrier was well into the slope of the filter, as much as 220 Hz, so I was getting at least 220Hz of "noise" in the other sideband (USB).

Note: To "see" the filter action in full you need more than speaking, the ideal is a withe noise generator, use any of the google shown softwares out there (google software audio white noise generator)  and approach your mic to the speakers  of your PC (dirty trick I know) and adjust the PC audio level until no more gain is shown.

With the circuit on hand I spoted the c104 and (missing) c103, I put a 5-30 pF variable trimmer in C103 and begin to adjust, sadly the signal goes into the filter and not outside... I had to much capacitance, switch the c102 (74p) by a 22pf, retest and this time I was able to get the carrier on the exact spot, almost in the trimmer lowest point.

Where I put the carrier exactly with respect of the filter slope is an old and problematic question: (at least to me)

Some manuals say -3dB, others -6dB, others say ~100Hz, I like to use -6dB AND more than 60Hz combination (yes my AC mains freq), almost all the time they are related, in this case it was very close to 100Hz away from the begin of the filter slope.

BTW, I would like to check any opinion/statement/directions on this last Issue as I can find any good reliable and definitive explanation on where to put the carrier against the SSB filter slope..

73 de Pavel CO7WT.

El 12/07/17 a las 16:09, KC8WBK via Groups.Io escribió:
In this video, Peter shows how to modify the audio by changing capacitance at C102 (47p).  The change in audio characteristics applies to both RX and TX.  Peter shows how a slightly higher tone is an advantage while using QRP.

https://www.youtube.com/watch?v=IELJwapv5qs

An alternate method to using capacitors of fixed value is to use a variable capacitor.  This allows trimming the capacitance while listening to audio.  You can select the tone you wish to hear and transmit on.

The following capacitor from Digikey will fit directly into the C103 holes.  Note that C103 is parallel to C102.  If this capacitor is added, remove C102.

https://www.digikey.com/products/en?keywords=SG9033-ND

I have done this mod and it works on RX.  You have to adjust the trimmer capacitor a bit to get good audio RX; when out of range, things sound a bit strange.  But after initial adjustments, you can fine tune it in.  I raised the tone a bit to pass more of the higher frequency audio.  I have not received any audio reports yet, so I can't speak to results on transmit.

Re: VK3YE Improved audio mod, Using a variable capacitor in place of C102

Jerry Gaffke
 

A better solution than adding a variable cap into the analog BFO would be to drive the modulator directly from CLK0 of the Si5351 as is done on the uBitx.  Totally replaces the analog BFO.  Has the following advantages:

1)  Allows BFO alignment to take place during calibration (with proper changes to the Arduino sketch).
2)  Allows us to scan through the filter passband, transmitting into a dummy load you could use a wattmeter to determine the shape of the crystal filter.  
3)  Allows the CW carrier to be placed in the center of the filter passband instead of on the skirt, for more consistent results.
4)  Can switch between LSB and USB while keeping the VFO up at 19mhz, avoiding most birdies and images.  (or can keep the VFO at 5mhz if you wish)
5)  Resistors are easier to find and cheaper than appropriate variable caps.

Jerry, KE7ER

Re: Raduino with Rotary encoder

Michael Hagen
 

Here it is for my RaduinoX PCB.  Just follow the Arduino pins for hooking up your Encoder.

Depending on options, you may want to move the "Bump" switch on the encoder around?

Modify your favorite Raduino Code for the interrupt and tuning with the encoder.

You can have a #define statement switch from Pot tune to Encoder in the same code.

My version is old now, and some of the second line on the LCD clashes with all the new functions that have been added.

I have the second line reading the Freq Steps when you push the Encoder Bump switch.

Mike, WA6ISP


On 7/17/2017 2:24 AM, Dexter N Muir wrote:

Jack's two files tell how to connect the *Arduino Nano*, and that is good generic background info. The Nano, however, is linked to the Raduiono PCB for the BITX40 - it's connection to this that would be far more helpful for the newcomer (and for old duffers like me! :) ). Anyone dunnit already who could pass on the info? perhaps a diagram? I doubt it's essential to connect directly to the Nano. A variation on Farhan's wiring diagram/s would be Excellent.
Hopeful ...


-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: Raduino with Rotary encoder

Dexter N Muir
 

Hi Jack.
"this" is the last-mentioned: the Raduino board.
My grammar is UK (NZ used to be a Colonial 'Dominion' of the British Empire :) , and retains this link via membership of the dwindling Commonwealth), and probably a little archaic. :)
Hope that 'clears the tracks'. 73, Dex, ZL2DEX

Re: VK3YE Improved audio mod, Using a variable capacitor in place of C102

KC8WBK
 


In the past I have had audio reports that say my audio is muffled, or "fm"ing.  I suspect the real problem was the low tone output by the audio bandpass.  I hear many other BITX40's with a similar problem, they sound low in tone, and are missing higher tones.

I have adjusted the trimmer cap a few times over the past week.  First, I went for a fairly high tone in RX.  When I asked for an audio report, I was told that my voice sounded too high. 

I trimmed the capacitor back a bit and found that it is easy to overshoot.  It requires a light hand and it took several tries to get the sound that I wanted.  I finally settled on a RX audio that had some low tones in it, but had more high tones than the original factory setting.  I received an audio report that described my voice as punchy, in comparison to standard BITX40 audio.

I don't have a way to measure the capacitance of the variable capacitor.  VK3YE chose 27 pF as the ideal capacitance.  I suspect that a capacitor from 27 to 30pF would be an improvement over the factory setting.

I am very interested if moving the audio band to a higher tone results in lower power output.  I suspect that at capacitance that causes higher tones, less power is output.  This is based on seeing my amp led indicator light not lighting up as much at a higher tone than at a lower tone, while adjusting C102 replacement cap.  Also, I had no PTT pop with higher audio tone.  This may or may not indicate lower power at the high tone settings.

I am very happy with this mod and hope that I will continue to get good audio reports.  One thing that I would recommend is that a fixed 27 to 30pF capacitor would be as good as a variable capacitor.  Remove C102 (47pF) and place the 27 to 30pF through hole fixed capacitor in the left two holes of C103.  This accomplishes the same thing as a variable capacitor, although it is interesting to be able to adjust the capacitance to see what happens to the tone.

raduino_v1.19 (improved tuning pot responsiveness) released

Allard PE1NWL
 

I've just released raduino_v1.19, download it from https://github.com/amunters/bitx40

New in this release:

  • Improved responsiveness of the tuning pot for smoother tuning (less need to fiddle up and down to set the desired frequency)
  • Improved "Fast Tuning" (at either ends of the tuning pot). The step size is now variable: the closer to the pot limit, the larger the step size.
  • In CW SPOT tuning mode, short side tone pulses will be generated instead of a continuous tone. This makes SPOT tuning easier when tuning to weak CW signals.
  • Calibration can now be done at 1 Hz precision

Happy BitX-ing!

73 Allard PE1NWL

Re: Raduino with Rotary encoder

Jack Purdum <econjack@...>
 

No, it's not that at all. I've written 18 books so far, and my first one looked like a chicken had been butchered on it there were so many editor changes in red ink. One of the things they really stress is not using "this" or "that" when it refers to something stated earlier. I was pretty sure I knew what you meant, but it never hurts to confirm.

Hope to get to the North and South islands within the next two years. I have several friends who have been there and said that's where they would go to live if they couldn't live here...a very high compliment from those people!

Jack, W8TEE



From: Dexter N Muir <dexy@...>
To: BITX20@groups.io
Sent: Monday, July 17, 2017 4:41 PM
Subject: Re: [BITX20] Raduino with Rotary encoder

Hi Jack.
"this" is the last-mentioned: the Raduino board.
My grammar is UK (NZ used to be a Colonial 'Dominion' of the British Empire :) , and retains this link via membership of the dwindling Commonwealth), and probably a little archaic. :)
Hope that 'clears the tracks'. 73, Dex, ZL2DEX



Virus-free. www.avast.com

Re: Raduino with Rotary encoder

Dexter N Muir
 

Thanks, Jack.
My investigations so far lead me to the need to connect direct to the Nano. Surely that could be avoided by software re-definition of pinouts? I also suspect such pins could be re-defined with internal pull-ups, making the encoder's "+" terminal redundant? My encoder should be arriving today or tomorrow - I wonder what my next fight will be?
73
Dex, ZL2DEX

Re: Raduino with Rotary encoder

Dexter N Muir
 

p.s. If you can get here, you'll be welcome! Look me up by APRS, and the door will be open. Your friends are right: NZ has been the destination of choice for 'boat people' fleeing turmoil in of via SE Asia. They typically don't get past Aussie blockade, so we remain 'safe and sane'.
73 agn ...

Re: Raduino with Rotary encoder

Jack Purdum <econjack@...>
 

I recently went through Allard's Raduino Code and pulled out the pin assignments I could identify in the code. I then went through my code for the TFT/VFO PCB that I'm using to make sure that my pin assignments don't conflict with Allard's. Although I haven't had Allard confirm these, it at least allowed me to use pins that I'm pretty sure won't collide. The reason for me doing this is for anyone who has made mods based on Allard's code but want to keep that mod using my code can do so, provided they move the required functions to my source files. Since I'm using a Mega 256K of flash memory, that shouldn't be a problem. 

If anyone does make such a change, please let the group know about your work. (This table is posted in the files section.)

Jack, W8TEE


                     Allard's Code                                  Jack's Code
Data Pin
Description
Data Pin
Description


0
Reserved for Serial monitor and debugging


1
                     “


2
INT0, interrupt vector 0


3
INT1,                 “        1
4
Do sidetone for zero beat (SPOT)


5
Side tone output (CW_TONE)


6
Turns on CW carrier (CW_CARRIER)


7
Switch between TX/RX (TX_RX)


8 - 13
Used for LCD display




14
CW message switch 1


15 
                 “                    2


16    
                 “                    3






18
INT3 interrupt, encoder pin A


19
INT2 interrupt, encoder pin B


20
Encoder switch pin






35
Dit pin


37
Dah pin






47
CW keyed output pin. Isolate with 4N26?


48
AD9850 frequency Update pin (FQ)


49
AD9850 reset pin (RST)


51
AD9850 serial data pin (MOSI)


52
AD9850 clock pin (CLK)
A0
Input, sensing PTT (PTT_SENSE)


A1
Straight CW key (KEY)


A2
Calibration (CAL_BUTTON)


A3
Function mode button (FBUTTON)


A4
Si5351 I2C protocol link


A5
                  “


A6



A7
Center pin, tuning pot (ANALOG_TUNING)




A14
Pin that reads the supply voltage divider 0-5V








From: Dexter N Muir <dexy@...>
To: BITX20@groups.io
Sent: Monday, July 17, 2017 7:27 PM
Subject: Re: [BITX20] Raduino with Rotary encoder

Thanks, Jack.
My investigations so far lead me to the need to connect direct to the Nano. Surely that could be avoided by software re-definition of pinouts? I also suspect such pins could be re-defined with internal pull-ups, making the encoder's "+" terminal redundant? My encoder should be arriving today or tomorrow - I wonder what my next fight will be?
73
Dex, ZL2DEX



Virus-free. www.avast.com

Re: VK3YE Improved audio mod, Using a variable capacitor in place of C102

 

I found with this mod it really depends on your voice as to what cap to use. I tried 27/22/33/44(2x22pf), I did find lower power at the 27 and 22 cap's almost zero on CW. I stuck with 44 for my voice and hearing, it was great and have had nothing but great audio reports.

 Just play with the values a bit and pick what fits for you, the standard 27pf change won't work the same for everyone.

73
  David

Re: VK3YE Improved audio mod, Using a variable capacitor in place of C102

John Smith
 

This is a link to a previous thread about the hack, including further explanation from the man himself Mr. Parker. I think it's important to point out, in his video he felt too lazy to turn the board over to solder in a proper trimmer capacitor. That's why he used ceramic caps, but did try to convey a trimmer is the better way to go. After doing it myself, I feel it one of the first improvements one should make.

https://groups.io/g/BITX20/topic/5114959?p=Created,,,20,1,0,0

Sideband issues

Eric Torraca
 

Hello all,

Greetings from Northern VT.
A while ago you all were very helpful with a code and rotary encoder issue I'd been having. Thanks for that. The issue was largely resolved when I downloaded a fresh copy of rotary.h and associates. Some corruption must have taken place somewhere along the way leading the encoder to do some strange things.

The current issue is to do with tuning as well, and I also think there's something amiss with the code again. I'm still trying to get a pre-Raduino Bitx40 on the air with an arduino / Adafruit Si5351 / rotary encoder setup wired to the DDS port on the bitx. The problem I'm having is that when I code the arduino to produce the roughly 19 MHz signal for the board using ULL and LL numbers, I get absolutely nothing on receive or I get what sounds like the wrong sideband. I gather there should be some sideband inversion going on? When I run the attached code, which is produces around 125 kHz as measured at clock 0 as being  by my ebay-sourced frequency counter, I get discernible signal, albeit tens of kHz off frequency. The only real difference is that the attached code uses L numbers and not ULL and LL. Can anyone take a look at the attached code and give me some pointers? I feel like I'm getting beaten up by some easy math here. 

My LO is measured at approx 11.956.000. When I run the correction sketch for the Si5351 I get a correction of -864000. Does that seem excessive to anyone else? Thanks in advance for the help. If anyone has any recommendations on the USB/LSB numbers in the code, I'd love to hear them.

Best regards to all.
73 de KB1VNA
Eric