Date   

Re: Please explain to me how works the VFO's

Gerard
 

hello Evan,
Thanks for your advice.
I had some idea that the code was good, otherwise no µBitx could work.

To night the spread seemed better (?). I caught Russians, Italians, etc
The sound was much louder, but still a bit distorted. You must play on the cursor of the pictogram representing the curve of the filter to improve.
I had recalibrated with a generator, but it makes a pure carrier and must distort the result. i will ask a French ham, if there is a reference transmitter.
In this case, i will test  this:
https://petetest2017.files.wordpress.com/2019/01/micro-bitx-calibration-instructions.pdf
I’ll also redo a good antenna. That’s 80% of the reception.

cdt


Re: Please explain to me how works the VFO's

Gerard
 

On Tue, Sep 15, 2020 at 08:26 PM, Evan Hand wrote:
The code should work with the SI5351 module and the 25MHz crystal setting.

Try adjusting the BFO to the 11996795 value and see if that helps.  Also, I would remove the AGC circuit from the rig at this time so that it is not limiting the audio to the amp.

Just suggestions.
73
Evan
AC9TU

 

 


From: Gerard <kabupos@...>

 
 
 
Reply to Group Discard Private


Re: Getting the knob on the shaft

Evan Hand
 

Kit,
I went back and finally could look at your picture.  That is the underside of the knob that is on my Antuino, so flip it over and pry off the plastic cover on the other side.  Loosen the slotted compression fitting then slip on the knob and tighten.

73
Evan
AC9TU


Re: Please explain to me how works the VFO's

Evan Hand
 

On Tue, Sep 15, 2020 at 10:09 AM, Gerard wrote:
When i calibrate the BFO, is good the low beat is exactly at 11998370  >> i thing it's good.
This may be where you are off.  What you calculated was the center frequency of the SSB filter if it was actually 12MHz.  The capacitors in the filter shape and lower the filter frequency.  Since those can vary in tolerances, the actual amount of shift varies from board to board.  Most would be between 1700 and 1800 lower.  You would need to run a scan on the filter to find the actual value (a NanoVNA or Antuino are good tools for that). 

The audio signal is 3kHz wide, so you need to subtract half of that or 1500 so that the BFO would be set at 12000000-1750-1500=11996750  That is very close to the BFO setting that I have for one of my v4 uBITX with a 12MHz SSB filter (11.996795).

The code should work with the SI5351 module and the 25MHz crystal setting.

Try adjusting the BFO to the 11996795 value and see if that helps.  Also, I would remove the AGC circuit from the rig at this time so that it is not limiting the audio to the amp.

Just suggestions.
73
Evan
AC9TU


Re: Replacing SMD component

R. Tyson
 

Hi Lawrence,
Using a toothpick and a glue stick to handle an smd component is a good tip. I will remember that one.

Thanks,

Reg         G4NFR


Re: Cw not working with straight key

R. Tyson
 

Hi Nigel,

I have two QCX, one for 40m and one for 20m. They are both very good rigs and have a great performance on CW. The uBitX is also a capable performer once it has a decent CW filter fitted.

Which one do I prefer... difficult to say the QCX rigs are very, very good.
The uBitX has multi band coverage and when fitted with a Nextion display and CEC firmware is also a good rig. Recommendations... get both   >:-) although I think you already have a QCX.

If you want a bit more RF then the QRP-Labs 50 watt amplifier is just the job. I can use mine with both my 40m QCX and also on 40m with my uBitX. Use either rig to drive the amp and, in my case, I use a 5 volt supply and a press switch to trigger the amp on Tx.

Reg               G4NFR


$20 ARRL coupon for completing survey

Doug W
 

If you complete the survey at http://www.arrl.org/survey you will receive a coupon code good for $20 off any purchase at the ARRL shop.  If you already ordered Jack's http://www.arrl.org/shop/Microcontroller-Projects-for-Amateur-Radio/ you can pick up http://www.arrl.org/shop/Experimental-Methods-in-RF-Design-Classic-Reprint-Edition/ .  If you already ordered both this is a great opportunity to get either book or both for someone new to the hobby or who otherwise could not afford them.  The code works for members and non-members.
--
www.bitxmap.com


Re: Getting the knob on the shaft

Evan Hand
 

The knob for my Antuino has a compression screw under the cap of the knob.  You need to carefully pry off the cover and loosen the large slotted screw.  Open so that you can fit the knob on the shaft, then tighten snugly. 

I do not have a v6 uBiTX, so not sure if it uses the same tuning knob.

73
Evan
AC9TU


Re: Getting the knob on the shaft

Kit Peters
 

No, I take that back. I don't see a set screw anywhere on the knob

On Tue, Sep 15, 2020 at 12:13 PM Kit Peters <popefelix@...> wrote:
Oh! I didn't realize there was a set screw. Boy, do I feel dumb now. :D

On Tue, Sep 15, 2020 at 12:07 PM Mark - N7EKU <n7eku@...> wrote:
Loosen the set screw on the top and then push down on it -- you need to let the leaves of the clamp expand.

73,


Mark



--
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--
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Re: Getting the knob on the shaft

Kit Peters
 

Oh! I didn't realize there was a set screw. Boy, do I feel dumb now. :D

On Tue, Sep 15, 2020 at 12:07 PM Mark - N7EKU <n7eku@...> wrote:
Loosen the set screw on the top and then push down on it -- you need to let the leaves of the clamp expand.

73,


Mark



--
Kit Peters, W0KEH
GPG public key fingerpint: D4FF AA62 AFEA 83D6 CC98 ACE5 6FAE 7E74 7F56 ED1D
Hello to any and all NSA, DEA, or other government or non-government agents reading this email.  Tell me about your life; I'll tell you about mine.


Re: Getting the knob on the shaft

Mark - N7EKU <n7eku@...>
 

Loosen the set screw on the top and then push down on it -- you need to let the leaves of the clamp expand.

73,


Mark


Re: Getting the knob on the shaft

Jeff Debes <jeff.debes@...>
 

Back the set screw out?
:)


On Sep 15, 2020, at 11:03 AM, Kit Peters <popefelix@...> wrote:


Photo of both knob and shaft. It looks like the knob is too small, but I'm pretty sure it came off the old encoder.

On Tue, Sep 15, 2020, 09:29 Raj vu2zap <rajendrakumargg@...> wrote:
An underside pic of your knob (only sinkering is here) will give us some
ideas to share with you.

Raj

At 15/09/2020, you wrote:
>I'll pause for the inevitable snickering...
>
>So I replaced the encoder on my uBITX and the knob doesn't seem to want to fit on the shaft. It seems to be the same diameter as the old one. Any suggestions for getting it on there?
>
>--
>Kit Peters, W0KEH
>GPG public key fingerpint:Â D4FF AA62 AFEA 83D6 CC98 ACE5 6FAE 7E74 7F56 ED1D
>Hello to any and all NSA, DEA, or other government or non-government agents reading this email.  Tell me about your life; I'll tell you about mine.




<IMG_20200915_094959.jpg>

--
jeff.debes@...


Re: Please explain to me how works the VFO's

Gerard
 

Hello,

i have made all the tests possibles on the hardware
1) Tested with frequency generator the first stage of amplificator (3 transistors) >>Ok
2) tested the second stage of amplificator (also 3 transistors)  >>ok
3) Tested the 45MHZ filter, the best signal is at 45007680 Htz >>> Delta of 7680Htz so tolerance of 0.0017%  >> Good for me
4) Tested the squale filter 12MHZ (I have 12MHZ crystal)  >>Best signal at 11.988370Htz Delta 11630htz (Quality of quartz)  >> good for me
5) tested the amplifier  >> ok

so some calculation:
The best LSB frequency will be of 56996050Htz  (56996050 - 11988370 =45007680
The best USB  frequency will be of 33019310Htz  (33019310 + 11998370 =45007680
When i calibrate the BFO, is good the low beat is exactly at 11998370  >> i thing it's good.
But when you made calibration, the zero beat is done too fast, just a few rotation movements. the sound also seems slightly more strident.
Frequency can by ajust at 33019310, I CAN't GO more  HIGHER in frequency. (EXmax 35 mhz)
I don't know how is made this calibration (On 33 or 56mhz)
THE PB in the recption:
When i put a counter, to be LSB or USB, frequency seem be the same.(Clock1)
The frequency of clock 0 seem also less....

All this to ask you if what is below is normal or not.
look on at the beginning of SI5351 code: (It's the same on V3, V6 for example)
 
#define BB0(x) ((uint8_t)x)             // Bust int32 into Bytes
#define BB1(x) ((uint8_t)(x>>8))
#define BB2(x) ((uint8_t)(x>>16))
 
#define SI5351BX_ADDR 0x60              // I2C address of Si5351   (typical)
#define SI5351BX_XTALPF 2               // 1:6pf  2:8pf  3:10pf
 
// If using 27mhz crystal, set XTAL=27000000, MSA=33.  Then vco=891mhz
#define SI5351BX_XTAL 25000000          // Crystal freq in Hz
#define SI5351BX_MSA  35                // VCOA is at 25mhz*35 = 875mhz

Should lines not be unlocked? like the definition of the crystal?
I have a SI5351 module (Cristal 25mhz) plugged into my main PCB. Does the app match?
I think the reception pb is there, following misalignment.

When do you think of all that?

cdt


Re: Getting the knob on the shaft

Kit Peters
 

Photo of both knob and shaft. It looks like the knob is too small, but I'm pretty sure it came off the old encoder.


On Tue, Sep 15, 2020, 09:29 Raj vu2zap <rajendrakumargg@...> wrote:
An underside pic of your knob (only sinkering is here) will give us some
ideas to share with you.

Raj

At 15/09/2020, you wrote:
>I'll pause for the inevitable snickering...
>
>So I replaced the encoder on my uBITX and the knob doesn't seem to want to fit on the shaft. It seems to be the same diameter as the old one. Any suggestions for getting it on there?
>
>--
>Kit Peters, W0KEH
>GPG public key fingerpint:Â D4FF AA62 AFEA 83D6 CC98 ACE5 6FAE 7E74 7F56 ED1D
>Hello to any and all NSA, DEA, or other government or non-government agents reading this email.  Tell me about your life; I'll tell you about mine.





Re: Cw not working with straight key

Evan Hand
 

Nigel,
I have a QSX+ and 3 uBITX transceivers (as well as a Hermes HL2) and would say that they are comparable, with maybe a little more sensitivity on the uBITX.  As stated earlier in this thread, the 2.7kHz bandwidth of the uBITX is a real shortcoming for CW, at least as far as I can tell (I am not really a CW operator).  Other areas that need improvement on the uBITX are the transfer from RX to TX and back as well as the offset that is in the stock software (the transmitted frequency is offset as an SSB rig would, rather than be the actual frequency of the transmitted signal).  You will need to change the Raduino Nano software to fix those issues, but the software is free thanks to open source contributors like Dr. Lee (KD8CEC) and Reed N.

The one really big difference is that the uBITX covers all bands, 80 - 10, The QSX+ is a single band, so you need multiple to cover the same range.  Another is the QCX+ is full break in, the uBITX is semi-break in after you fix the software issues.

If cost is the most significant factor, the QSX+ is $80 vs $209 for the uBITX full kit (both with enclosures and excluding shipping).

As an all-around radio, the uBITX is a better deal, however, there are potential issues, as you can tell if you monitor this reflector.  

It is really up to you to work out what you want from the rig, how much you want to spend, and if you would be up to troubleshooting some of the problems of either of the rigs.  I could not decide and enjoy building, so I have both ;-)

73
Evan
AC9TU


Re: Getting the knob on the shaft

Bob, N1KPR
 

I'm not sure if this is the problem for you, but I face similar all the time between US/euro-asian controls and knobs; If it's a 6mm hole, then it must be opened to 1/4"...maybe that's what's going on ???

Bob


Re: Getting the knob on the shaft

 

An underside pic of your knob (only sinkering is here) will give us some
ideas to share with you.

Raj

At 15/09/2020, you wrote:
I'll pause for the inevitable snickering...

So I replaced the encoder on my uBITX and the knob doesn't seem to want to fit on the shaft. It seems to be the same diameter as the old one. Any suggestions for getting it on there?

--
Kit Peters, W0KEH
GPG public key fingerpint:Â D4FF AA62 AFEA 83D6 CC98 ACE5 6FAE 7E74 7F56 ED1D
Hello to any and all NSA, DEA, or other government or non-government agents reading this email. Tell me about your life; I'll tell you about mine.


Getting the knob on the shaft

Kit Peters
 

I'll pause for the inevitable snickering...

So I replaced the encoder on my uBITX and the knob doesn't seem to want to fit on the shaft. It seems to be the same diameter as the old one. Any suggestions for getting it on there?

--
Kit Peters, W0KEH
GPG public key fingerpint: D4FF AA62 AFEA 83D6 CC98 ACE5 6FAE 7E74 7F56 ED1D
Hello to any and all NSA, DEA, or other government or non-government agents reading this email.  Tell me about your life; I'll tell you about mine.


Re: Assembly instructions for the ubitx v4

Evan Hand
 

Rob,
Thank you!  
I am retired, so I have quite a bit of time to do the research, and learn in the process.  I have also built and rebuilt 3 different uBITX as well as a number of other radios recently and used them in most modes EXCEPT CW for anything other than testing.  I am still too rusty in that mode to be willing to fumble through a QSO.

Again, Thank you for the compliment.
73
Evan
AC9TU


Re: Cw not working with straight key

Nigel ZS6RN
 

Thank you Reg for feedback and link(s) - appreciated. 

Am also thinking uBtix will be used predominantly for CW and keen to make comparison (on receiving) with QCX although hopefully on the Tx side there will be a little more RF being generated by the uBitx ;-)

Stay SAFE and as always remember to KEEPSMILING :-) 

73 Nigel 

ZS6RN ex G8DEV a l-o-n-g time ago! 

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