Date   

Re: Highlighting band selected

Arv Evans
 

Jeff

Until you have tried the alignment procedure there is no way we can know 
if you have a real problem, or if you just have not performed the alignment 
process.  We would like to help you, but you have to work with us.  What 
have you tried thus far?  What were the results of performing the alignment 
process?

Arv
_._


On Thu, May 28, 2020 at 6:18 AM Jeff Debes <jeff.debes@...> wrote:
Ok Stephen,
I will think about trying it.
I used to do a small bit or arduino programming but that is not something i want to get back into.
Right now though I need to know why my radio only works as double sideband. I don’t think its an alignment problem,  I  have doubts that tuning will cure the issue.  
I hope someone has ideas on what might be wrong else I might want to return this unit to HD Sigs as defective.
Jeff


On May 28, 2020, at 7:28 AM, Stephen KO4CVU <goinfishin1952@...> wrote:

Jeff, I can vouch for Reed’s software. It makes a great improvement in the operation and control of the touchscreen. Downloading and installing It was my first experience working with an Arduino Nano, (although I did have some experience with programmable logic controllers years ago.) If I can do it, it must not be too hard! :) I will be happy to share my notes about the process with you, if you’d like them.

--
jeff.debes@...


Re: Both sidebands present on receive or transmit? V6

Arv Evans
 

Jeff

Have you tried to do the necessary adjustments?  

Arv
_._


On Thu, May 28, 2020 at 5:28 AM Jeff Debes <jeff.debes@...> wrote:
It really seems that this radio is  working as double sideband  transmit and receive.
Not sure that adjustments will
fix this.


--
*jeff.debes@...*




Re: Turn of BFO mod

Arv Evans
 

Jeff

This is an SSB radio.  It requires the BFO to heterodyne the IF frequency to audio.

It might be possible to convert it to an AM radio by building a non-SSB detector to 
connect ahead of the heterodyne style detector circuit.  Why stop at AM?  Might 
also be interesting to add an FM style IF section and FM detector!

Another possibility is something like the rather old "Q-5'er" which would be an AM 
receiver tuned to the IF frequency and connected ahead of the SSB detector.
This might work, or might be plagued with BFO leak-through, unless the BFO were 
set way off the IF frequency or even turned off for AM mode.

All desires for the SSB transceiver to do something that it was not designed to do 
may be possible, and many on this group have dome some of these mods.  What 
is required to successfully modify the original circuit and original software is a good 
knowledge of how the system actually works, and how to design suitable 
modifications.

Arv
_._


On Thu, May 28, 2020 at 5:28 AM Jeff Debes <jeff.debes@...> wrote:
Is there a way/mod  to turn off the bfo to listen to AM signals?


--
*jeff.debes@...*




Re: UK Import Charges

howard winwood G4GPF
 

they are! but not exempt to vat. vat goes on postage too.

On 28 May 2020, at 16:10, Mark GØNMY <mark.g0nmy@...> wrote:

I always thought Amateur radio parts were exempt form import duty??

 


New V6 CW tone frequency

rskarka@...
 

Yesterday I received my new uBITX v6 full kit and assembled it. After a short function check (could hear some CW and FT8 signals), I installed CEC firmware and Nextion display. Everything worked right out of the box, but later I noticed, that when I tune to CW signals, the audio tone is very high. When I tune the HF for strongest audio signal, the audio tone is around 5khz, and when I change the frequency to get the tone lower, the signal disappears before getting down to the range of 1kHz.
For testing, I tuned to a strong CW station in LSB, USB, CWL and CWU. The highest volume for each mode was approximately:

7029 kHz LSB
7033 kHz CWL
7023 kHz CWU
7025 kHz USB

With SSB modes I can tune the tone frequency down, but also the signal is stronger at higher frequencies than 800Hz.


So far, I didn't do any calibration, and right after uploading the CEC firmware, I downloaded the eeprom data with the ubitx manager software.
Could this be a frequency or bfo calibration issue? Im not sure, because it is mostly a problem in CW modes, and I thought the boards come calibrated from the factory.

Should I go back to the stock fw and display to run the calibration procedure of the V6 firmware with the web spectrum analyzer tool?

Something else to check? I have an HP/Agilent Oscilloscope, but the last calibration of that was 2003, so not sure how accurate the frequency counter of that is.

Thanks for help,

Robert


Re: Bitx V6 Modifications

Jhard356@...
 

Stephen
Thanks for your reply. What microphone with pre-amp would you recommend? 
Jody


On May 28, 2020, at 12:57 PM, Stephen KO4CVU <goinfishin1952@...> wrote:

First, read the “uBITX Power and Gain Issues” topic in the Wiki for more information. Don’t expect the same power output on 10 meters as you might get on 80 meters.
Second, go ahead NOW and order a microphone with a pre-amp if you intend to communicate via phone/SSB. You will also need a stereo plug to install on the new microphone cord, if you buy one.
Third, after turning on the unit and familiarizing yourself with the factory Arduino sketch, download and install Reed’s latest sketch. You will really appreciate his improvements.
Fourth, spend a LOT of time watching Arhhan’s video about how to adjust the VFO and BFO. You may need to check these adjustments on the radio you receive. It has taken me a number of adjustment attempts to get close to usable settings.


Re: Not getting daily digests

_Dave_ AD0B
 

Yes mine and a local friend noticed the same thing , no overnight digests since about a week ago. 
I was able to get it back when I switched to full featured digest.
--
73
Dave
ADOB
Raduino bracket and Ham_Made_Keys


Re: Turn of BFO mod

Evan Hand
 

Maybe a diode detector (like an RF probe) between CW-1 pin 1 and TP 20 might work to receive.  The selectivity is then defined by the 45 MHz roofing filter, which is 15 kHz wide.  You would need to turn off the BFO.  It would require a switching circuit for the diode to be able to back to SSB/CW with the crystal filter.

Just speculation on my part.

73
Evan
AC9TU


Re: Turn of BFO mod

Curt
 

Jeff

we get the framework of your question - its in relation to BFO action on 'ancient' typically general conversion receivers, that lacked a proper product detector. 

an AM signal off course is 2X or more wider than SSB, especially if we want more spectrum into our headphones.  the 2nd xtal filter is too narrow for AM signals - for both sidebands to pass through.  but some may have added a product detector after the first 45 MHz xtal filter.  try a search engine to see who has reported results adding an envelope detector -- uBITX envelope detector or AM detection.  BTW, an envelope detector is pretty much a simple diode - but it has to have appropriate gain in front of it (but it might not take much for huge 41m AM signals.  others add a SDR at 45 MHz that would also be a good AM receiver. 

I appreciate your inquisitiveness.  Too easy for us to miss context of your question, not presuming product detector behavior.

73 curt


Re: Turn of BFO mod

Reed N
 

I described how to skip the BFO stage, but didn't put any thought into if it would actually work for AM. It may actually be that the audio mixing stage ended up becoming the BFO, sans filter, or perhaps there would be no output at all, like you speculate.


Reed


Re: Not getting daily digests

Marko Barovic
 

I'd try checking if they somehow ended up in Spam. Sometimes that happens to me with just random subscription emails like YouTube.

Cheers,
Marko

On Thu, 28 May 2020, 8:01 PM AGØH <kmilr1@q.com> wrote:
I haven't been getting the 'daily digest' from this group for over a week.  I've gone into my subscription settings and found nothing has changed:  the daily digest option is still checked.  I rechecked it again and hit the 'save' button.  
Unfortunately, nothing has changed.  
How do I 're-activate' it?
Keith-AGØH


Re: Turn of BFO mod

Dale Parfitt
 

Hi Reed,

I cannot see how a signal  will be present at the output of the product detector if you remove the BFO signal. Isn’t that equivalent to multiplying by zero (0)? And then any residual that  does remain (extremely low level) would require an envelope detector for AM demod.

 

Dale W4OP

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jeff Debes
Sent: Thursday, May 28, 2020 1:52 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Turn of BFO mod

 

Thank you Reed , you’re always very helpful!



On May 28, 2020, at 12:14 PM, Reed N <greenkid336600+groupsio@...> wrote:


You should be able to listen to AM even with the BFO. However, if you want to get rid of it completely for some reason, you'll need to jumper C211 to C40 to remove the BFO crystal filter stage, then modify the code to get the correct mixing products on the audio side. I don't think I'd recommend this.


Reed


--
jeff.debes@...


Not getting daily digests

AGØH
 

I haven't been getting the 'daily digest' from this group for over a week.  I've gone into my subscription settings and found nothing has changed:  the daily digest option is still checked.  I rechecked it again and hit the 'save' button.  
Unfortunately, nothing has changed.  
How do I 're-activate' it?
Keith-AGØH


Re: uBitX assembled: bit of a challenge with alignment/bfo adj - Volume/switch knob fix

Jeff Debes
 

Great explanation Arv! 
Thanks!


On May 28, 2020, at 1:55 PM, Arv Evans <arvid.evans@...> wrote:


Dan

It seems that a number of new users of uBITX are not familiar with the "zero-beat" 
process, and not familiar with BFO offset relative to crystal filter bandwidth.  

If doing a zero-beat and your BFO is not properly aligned then the received signal 
will not be placed properly inside the filter passband.  This Allows the opposite 
sideband to be heard over top of the zero-beat.  

Technical info..... When setting the BFO frequency relative to received frequency, 
the BFO should be set approximately 12 db down one side of the crystal filter 
skirt.  Which skirt is determined by which sideband is going through the filter.
You have a DSB signal prior to the filter and setting the BFO 12 db down the 
filter skirt further reduces the unwanted sideband.  Doing this also rolls-off low
frequency audio tones to make your sideband signal more efficient.
The uBITX assembly instructions do include a block diagram that should make 
this easier to understand.  

Arv
_._


On Wed, May 27, 2020 at 10:14 PM <pulco.ant@...> wrote:
Hello. Got my full kit (board v6.2 / firmware v6.1) the other day and assembled it this morning.Easy as pie.

I managed to puzzle out (I think) how to get into alignment: hold tuning knob in while powering up. The screen calibrate _everytime_ is annoying. Zerobeating is challenging because there is a second hetrodyne that becomes audible and climbs in frequency *just* as I'm approaching zerobeat. So far, when I tune WWV afterwards, the display read 10,000.05, and I've done it a number of times. Setting the BFO - what's that about? I used an audio spectrum analyzer as 1 post suggested, but - is that all there is to it?

Volume/switch knob: I dealt with that by grinding down about 3/32" of the knob from the radio side of the knob. This allows that setscrew to move further down the switch shaft and it gets much better purchase on the shaft.It just doesn't have the same flare now as the tuning knob.

Please ring in with suggestions.

Thanks and 73
--
Dan D'Eon
AG7GM


--
jeff.debes@...


Re: Bitx V6 Modifications

Stephen KO4CVU
 

First, read the “uBITX Power and Gain Issues” topic in the Wiki for more information. Don’t expect the same power output on 10 meters as you might get on 80 meters.
Second, go ahead NOW and order a microphone with a pre-amp if you intend to communicate via phone/SSB. You will also need a stereo plug to install on the new microphone cord, if you buy one.
Third, after turning on the unit and familiarizing yourself with the factory Arduino sketch, download and install Reed’s latest sketch. You will really appreciate his improvements.
Fourth, spend a LOT of time watching Arhhan’s video about how to adjust the VFO and BFO. You may need to check these adjustments on the radio you receive. It has taken me a number of adjustment attempts to get close to usable settings.


Re: uBitX assembled: bit of a challenge with alignment/bfo adj - Volume/switch knob fix

Arv Evans
 

Dan

It seems that a number of new users of uBITX are not familiar with the "zero-beat" 
process, and not familiar with BFO offset relative to crystal filter bandwidth.  

If doing a zero-beat and your BFO is not properly aligned then the received signal 
will not be placed properly inside the filter passband.  This Allows the opposite 
sideband to be heard over top of the zero-beat.  

Technical info..... When setting the BFO frequency relative to received frequency, 
the BFO should be set approximately 12 db down one side of the crystal filter 
skirt.  Which skirt is determined by which sideband is going through the filter.
You have a DSB signal prior to the filter and setting the BFO 12 db down the 
filter skirt further reduces the unwanted sideband.  Doing this also rolls-off low
frequency audio tones to make your sideband signal more efficient.
The uBITX assembly instructions do include a block diagram that should make 
this easier to understand.  

Arv
_._


On Wed, May 27, 2020 at 10:14 PM <pulco.ant@...> wrote:
Hello. Got my full kit (board v6.2 / firmware v6.1) the other day and assembled it this morning.Easy as pie.

I managed to puzzle out (I think) how to get into alignment: hold tuning knob in while powering up. The screen calibrate _everytime_ is annoying. Zerobeating is challenging because there is a second hetrodyne that becomes audible and climbs in frequency *just* as I'm approaching zerobeat. So far, when I tune WWV afterwards, the display read 10,000.05, and I've done it a number of times. Setting the BFO - what's that about? I used an audio spectrum analyzer as 1 post suggested, but - is that all there is to it?

Volume/switch knob: I dealt with that by grinding down about 3/32" of the knob from the radio side of the knob. This allows that setscrew to move further down the switch shaft and it gets much better purchase on the shaft.It just doesn't have the same flare now as the tuning knob.

Please ring in with suggestions.

Thanks and 73
--
Dan D'Eon
AG7GM


Re: Turn of BFO mod

Jeff Debes
 

Thank you Reed , you’re always very helpful!


On May 28, 2020, at 12:14 PM, Reed N <greenkid336600+groupsio@...> wrote:


You should be able to listen to AM even with the BFO. However, if you want to get rid of it completely for some reason, you'll need to jumper C211 to C40 to remove the BFO crystal filter stage, then modify the code to get the correct mixing products on the audio side. I don't think I'd recommend this.


Reed

--
jeff.debes@...


Re: Highlighting band selected

Jeff Debes
 

Bill,
I feel that your comments were at least in some part targeted at me and therefore warrant an answer.
People are almost as varied in personality and in desires as nature is itself .
One should not should presume or judge anything about another persons knowledge level or what that person has contributed to ham radio or to any worthy aspect of society.
Ham radio as a hobby is now more varied in interests and reasons for interest in the hobby than ever. ( and that is a good thing! )
No question is wrong, no judgements should be presumed about those asking questions. That will just turn people away.
Snobbery of knowledge of a particular subject include this hobby is simply wrong.
Yes , you ( we all) often feel that everyone should dive into ham radio.
But I try to be a generalist, not an top expert in anything but looking at the big picture.
In profession, I was a Systems Engineer at Xerox Corp. Now retired . I am as you probably already know , an Extra Class ham op , first licensed as a Novice in 1963 , call sign WN2RHU. My other hobbies are varied and include hiking /Mt climbing. Climbed the 46 high peaks.
Spent many years as a mentor in First Robotics , etc etc
So wrap up :
On this DL , no question or even complaint is ill founded . Let’s not judge people .
Yes, people can look things up , and learn .
Some will, but some will just want to get to the goal of a working radio.
Expressions of frustration by questions are simply symptoms of some issues that may need to be fixed in by HFSigs or answered amiably without judgement by knowledgable people in this group.
If the same questions come up more than once, it would beg of the need for change /improvement to product, group response, or documentation access.

Jeff

On May 28, 2020, at 1:00 PM, Bill Cromwell <wrcromwell@...> wrote:

Hi,

Maybe there are some unfair or unrealistic expectations of some minimal knowledge to become a ham. The instructions seem to be written with that in mind. One thing we learn when we must write is who the target audience actually is. To be fair to HF Signals I have been surprised by the nature of some questions asked by licensed hams - even without an expectation that new hams know *everything*. None of us knows *everything* and learning only stops when we die without us ever knowing *everything*. My comments are not aimed to offend or insult or belittle anybody.

Just to balance those statements, I have personally known hams with extra class and commercial licenses who clearly did not know some basic things. To me that was even more incredible than some of the questions I see today. At least today's newbies know to ask them even if they don't know the words needed to ask:) I am now one of thos *old* extra class hams and I try to not be like those fellows I have just mentioned. I know I am a very poor 'distance elmer' and I wish I could get a few of those new hams in my shop for a day or two. If they ask me something I don't know we could both learn:)

73,

Bill KU8H

On 5/28/20 10:57 AM, Jeff Debes wrote:
Bill, Tony,
Thanks for the advice.
To be clear: I have a confirmed QSO where the op copied me on LSB and USB with out me changing any settings.
Is that still a possible symptom for misaligned BFO?
If so fine. I will try again at home with a PC.
I want to say that the kit is sold as a working board, & the buyer is trusting that it is working, that it was tested properly. What if it is not? That will happen.
Documentation clarity for engineers is one matter, and appears to be simple enough, for casual builders it may need to differ.
A support group such as this is fine for resolving many issues , but it should not be the only recourse.
Why do so many users come back here to ask questions? ( the documentation is not adequate?)
Personally, I’m used to building non-digital circuits/radios. There is operability simplicity , excellent ease of use, and clarity in analog radio circuits.
Anyway
Thanks everyone for the advice. I will try the suggestions.
Jeff
--
bark less - wag more


--
*jeff.debes@...*


Re: Highlighting band selected

Arv Evans
 

Jeff

The OS is open source.  That should make it possible for you to add your own 
"features".  At one time I suggested that key strokes or display touches should 
be accompanied by a "beep".  That should be easy to implement in just a couple 
lines of code.  Extending this thought...maybe also blink the display when a 
button or command is issued?  That too would be only a few code statements.

Part of the advantages of the uBITX open source code is that you can make 
changes at will.  Cannot do that with the popular K3 or similar high priced 
transceivers.

If you do take on the challenge to upgrade the assembly and operating 
instructions, I would suggest that you use some sort of version-control 
editor.  This would highlight your changes and make it easier for Farhan to 
add those particular changes to the master document.  

Arv
_._



On Wed, May 27, 2020 at 8:10 PM Jeff Debes <jeff.debes@...> wrote:
Anyone know if there is a software mod to highlight the band currently selected?

It is poor user operability if touching a button shows no action on that button.

Jeff


--
*jeff.debes@...*




Re: SI5351 without library #si5351

James Lynes
 

Edorado:

Have you looked at the Bitx40 or uBitx code? Neither use a si5351 library(too large), but use a small subroutine written by Jerry instead. Pull out parts of this code for your needs.

It takes serious study to understand all of the register manipulation required to drive the si5351. Luckily Jerry figured this out for us.

James