Date   

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


What’s actually better?

ohwenzelph
 

I thought a 2N2219 was a 2N2222 in a bigger package that can handle a bit more heat, so basically the same device otherwise.

On 
uBitx.net the following is attributed to Alison

Pre-driver – We need the gain again to be more stable and higher as well. Transistors tried that worked better included the TO18 2n2222A

Driver –This is where the 2n3904 really fails. Its bandwidth at high currents actually does down. The 2n2222A has the reverse, the gain and bandwidth increased with increasing current.

On HFsigs Farhan says

Transmitting The power chain uses four common plastic 2N3904s in push-pull as drivers. The 2N3904s have enough gain at 30 MHz. The 2N2219s tried  earlier were found to have low gain at higher frequencies.

So... which has more gain/performs better on  ~17, 15, 12,10 meters in the uBitx if you ignore cost? 

Also so when did 2N2222s get costly? They were once called something like the “cockroaches” of electronics.

tnx
jer aa1of


Re: Highlighting band selected

Bill Cromwell
 

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


Re: Bitx V6 Modifications

Aaron K5ATG
 

I just got my v6 together also. 
I would suggest getting on the air with it and then decide what changes you would like to make. 
Ashhar Farhan told me that the first thing I should do is look at the Arduino sketch and play around with that. 
That being said, I would be interested in what people are doing with it. 


Re: Highlighting band selected

Reed N
 

Hi Jeff,

I would love to see my work get pulled into the main line, but I don't have any control over that. Ashhar certainly could do so at any time, but hasn't so far. He did pull a little from the CEC software for the v6 release, so maybe the next generation v7 software might have some of these fixes?


Reed


Re: Turn of BFO mod

Reed N
 


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


Re: UK Import Charges

Mark GØNMY
 

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

 


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

Jeff Debes
 

I’m just going to find a smaller knob, It doen’t need to be as large as it is.



On May 28, 2020, at 10:55 AM, pulco.ant@... wrote:

Reed, thanks so much. this was very helpful.
--
Dan D'Eon
AG7GM

--
jeff.debes@...


Re: Bitx V6 Modifications

Dan D'Eon
 

I'll be lurking this thread:I just put together my uBitx v6 yesterday.

FYI, There are at least 3 things I plan on in a hurry. 1) Receiver AGC 2) Microphone preamp 3) Nextion screen.
--
Dan D'Eon
AG7GM


Re: Highlighting band selected

Jeff Debes
 

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

On May 28, 2020, at 9:25 AM, Bill Cromwell <wrcromwell@...> wrote:

Hi,

I have to agree with Tony and the others on this. A misaligned BFO will produce the same symptoms on *ANY* radio like this one (includeing those with four figure price tags). I have worked on a few for other hams and the BFO way way far off on the ones with these symptoms.

If you are unable to get it working you might find somebody on here to get it going for you. I think you should try to get it working yourself. I did not find any deficiencies in the instructions.

73,

Bill KU8H

On 5/28/20 8:27 AM, Tony Vandenborn wrote:
Jeff
When you study the uBITX block diagram, and understand it, you can clearly see it is rather impossible that your radio receives/transmits both sidebands same time. You really have to align the BFO and master oscillator frequencies, your kit is not defective!
Tony
Op do 28 mei 2020 om 14:18 schreef Jeff Debes <jeff.debes@... <mailto:jeff.debes@...>>:
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
<@KO4CVU <mailto:@KO4CVU>> 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@... <mailto:jeff.debes@...>*
--
bark less - wag more


--
*jeff.debes@...*


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

Dan D'Eon
 

Reed, thanks so much. this was very helpful.
--
Dan D'Eon
AG7GM


Bitx V6 Modifications

Jhard356@...
 

Just ordered Bitx V6 and was wondering what modifications should be added? If someone could list them in order of most improvement it would be appreciated.