Date   
Re: uBITX Mic Wireup

Arv Evans
 

Dex

You are right on.  Since the electret microphone uses a microphone voltage
resistor inside the uBITX or BITX-40 (or any older BITX with electret microphone)
it is possible to sense voltage drop across this resistor (with a MOSFET...?)
and key the transceiver when the microphone circuit is closed.  This is for
those who are wondering how to connect a 2-wire electret microphone with
built-in PTT switch. 

This is particularly useful for those cheap combination ear-buds and electret
microphone that we see in the Dollar Stores. 

Arv
_._


On Sat, Mar 10, 2018 at 1:04 PM, Dexter N Muir <dexy@...> wrote:
Fanciful, perhaps, but would it be possible to detect the current drain of the electret as a PTT? Enough resistance in the feed resistor of the rig should take the electret voltage down to mid-supply - detect that.
de ZL2DEX


Re: uBITX Mic Wireup

Dexter N Muir
 

Afterthought: perhaps feed the electret from the base of a PNP?
Dex

Re: uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester. #ubitx

Ian Lee
 

Philip.
You are right. I used the trick to reduce the program size, which did not work as I thought. Using a function called SetTxFiler will solve this problem easily.
After the weekend, I will update uBITX Beta version next week.
And I was able to check your radio signal at wsprnet.org.

Thanks for testing.

Ian KD8CEC

2018-03-09 23:56 GMT+09:00 Philip <philip.g7jur@...>:

Hi Ian.

The frequency error is down to the way uBITX manager calculates the RF frequency. If I enter into the Band 2 box 14094850 Hz, then the audio comes out of my radio at 1.5 KHz, when it is tuned to 14.09560 MHz.
Now my WSPR is going all around the world.
I do find that I get a bit confused by all the calculations, when trying to work out all this stuff.
Anyway thanks for putting WSPR in to the uBITX, a great bonus.

Philip G7JUR 



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester. #ubitx

Ian Lee
 

Carlos.

Wow great! It is very nice graph.
My plan is to climb mountains with only uBITX. And it sends WSPR by each band and communicates with built-in memory keyer.

I will Search your callsign in wsprnet.org

Could you test the new version next week?

Ian KD8CEC

2018-03-10 5:25 GMT+09:00 Carlos E. Wenzel <Ik2yra@...>:

uBiTx on air....Tks Ian / Philip

Carlos

2018-03-09 21:12 GMT+01:00 Carlos E. Wenzel <ik2yra@...>:
So simple.... TKS Philip
Carlos

2018-03-09 21:01 GMT+01:00 Philip <philip.g7jur@...>:
Carlos.
Just enter it in the box, it is in hz. Not Mhz, so no decimal point.
Philip.




--
Carlos Wenzel
ik2yra@...
+39-3284684518
Skype: IK2YRA



--
Carlos Wenzel
ik2yra@...
+39-3284684518
Skype: IK2YRA



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: uBITX Mic Wireup

Clark Martin
 


Clark Martin
KK6ISP

On Mar 10, 2018, at 12:10 PM, Anthony Luscre <k8zt73@...> wrote:

I am not clear on the mic wiring.
  • Is it polarized (which terminal is which on mic)?
As a general rule, one of the terminals on an electret mic is attached to the metal case while the other is insulated from the case.  The terminal attached to the case is ground.  The other, insulated, terminal is signal.

  • Is there a capacitor that is to be included in wiring?
There is a capacitor on the µBitX board, C61.  You don’t want to connect the microphone through a capacitor, it needs a DC bias (also on the board).

From the Hans Blog-Wise idea to avoid a "monopoly"-

 

I agree with Hans and I think when the common sense fail a reminder as this a very good option for the health of the blog and the group relationship.

----------------------------------------------------

Hi all
 
This is a monthly reminder of guidelines for posting to the QRP Labs group. Keep these guidelines in mind when posting to the group. 
  1. Remember your email goes to up to 2500 people - so ask yourself, is it something you really want 2500 people to see?
  2. Before asking a question, please ensure you have read the relevant manuals and web pages thoroughly, to see if your question is already answered somewhere.
  3. Also check the FAQs http://qrp-labs.com/faq and http://qrp-labs.com/qcx/faq 
  4. Don't write about your kit arriving. Send that to sales@... instead - where it is compiled into statistics published here http://qrp-labs.com/shipping
  5. For any questions about shipping or your order, please email sales@... instead
  6. In the event of any missing or damaged component, please email sales@... instead
  7. Please don't write "Happy Christmas", "Happy New Year" etc messages - it's very nice of you but imagine if all 2500 members wrote it...
  8. It is nice and friendly, to provide your name and callsign - or if you wish, you can add a photograph and whatever details you like, to your profile: https://groups.io/account?page=profile&profilesubid=0
  9. Ideally label the subject with a tag in square brackets e.g. [QCX] to help people who may wish to set up filtering.
  10. If you are asking for help with a problem, please provide as much information as possible about your problem; "Doctor I feel sick" never helps the doctor to diagnose much, without a lot of further questions; it saves time and messages, if you provide as much information as you can at the outset. 
  11. If you change the topic of a thread, please edit the subject line or start a new thread, to keep the content and subject lines relevant.
  12. Remember, a lot of people in the group are hobbyists trying to help other hobbyists for free and in their own spare time.
  13. If you find the volume of emails too high, remember that you could also configure your group membership to send you "daily digest" emails, collecting all posts for a day into one; or you can configure it to group 12 posts in one email. 
Thanks & 73
Hans G0UPL

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Jerry Gaffke
 

I think I was wrong in my previous post, shifting the value of SECOND_OSC_USB won't help.
The audio frequencies through the crystal filter should be strictly a matter of where the BFO is relative to 
the crystal filter passband.  I can't explain why USB audio would be different than LSB audio.

I'm not quite sure what you mean by "IF Shift function".
Can you give an example?

Jerry


On Sat, Mar 10, 2018 at 11:59 am, Mike Woods wrote:
The IF Shift function should only be applied during RX, but it sounds like it is being applied during TX in error in KD8CEC's sketch.  Probably a bug.

However, the op shouldn't be using the IF Shift permanently, he may not have used the BFO calibration function to fix the shift for LSB & USB for the correct passband.

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Jerry Gaffke
 

Though Ian has responded, he seems to know what's going on here.


On Sat, Mar 10, 2018 at 12:54 pm, Jerry Gaffke wrote:
I think I was wrong in my previous post, shifting the value of SECOND_OSC_USB won't help.
The audio frequencies through the crystal filter should be strictly a matter of where the BFO is relative to 
the crystal filter passband.  I can't explain why USB audio would be different than LSB audio.

I'm not quite sure what you mean by "IF Shift function".
Can you give an example?

Re: ubitx order

David Guthrie
 


Thanks Terry,

I am sure everything is good.  Just excited about getting the new ubitx.

Dave kn4ok

On ‎Saturday‎, ‎March‎ ‎10‎, ‎2018‎ ‎01‎:‎13‎:‎35‎ ‎PM‎ ‎CST, Terry Morris <terry.kb8amz@...> wrote:


Dave, KN4OK,

I ordered/paid on January 12. I received notification from PayPal yesterday, March 09, that my ubitX is shipping. Since I used India Postal Service I may have another month before receiving it the skuttlebut on the forum is accurate.
72,


Terry - KB8AMZ
Brimfield Twp, OH
Linux User#412308, Ubuntu User #34905
OSs: LM18.1, Ubuntu 16.04, Puppy tahrpup64, Raspbian
Orgs: PCL70-FOP, NTHS, ALUG, ARRL, PCARS#78, NAQCC#6668, NO-QRP-C, QRP-ARCI#8855
I chair the PCARS CW/QRP SIG and Linux for Hams SIG, second and fifth Tuesday

my computer, my opinion

On Sun, Mar 4, 2018 at 2:53 PM, davekn4ok via Groups.Io <davekn4ok@...> wrote:
Hi Group,

I ordered a ubitx Feb 11th and went with the DHL shipment.   Have not seen it yet and was wondering if anyone else is still waiting?

Dave KN4OK


Re: uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester. #ubitx

Carlos E. Wenzel <Ik2yra@...>
 

Yes, I will test it as soon as you issue it.
Mo and tue I'm going to be  at home....so. 
Hope to hear you from some SOTA summit soon. 
Carlos 
Always tks for ur job! 

Il 10 mar 2018 21:35, "Ian Lee" <kd8cec@...> ha scritto:
Carlos.

Wow great! It is very nice graph.
My plan is to climb mountains with only uBITX. And it sends WSPR by each band and communicates with built-in memory keyer.

I will Search your callsign in wsprnet.org

Could you test the new version next week?

Ian KD8CEC

2018-03-10 5:25 GMT+09:00 Carlos E. Wenzel <Ik2yra@...>:
uBiTx on air....Tks Ian / Philip

Carlos

2018-03-09 21:12 GMT+01:00 Carlos E. Wenzel <ik2yra@...>:
So simple.... TKS Philip
Carlos

2018-03-09 21:01 GMT+01:00 Philip <philip.g7jur@...>:
Carlos.
Just enter it in the box, it is in hz. Not Mhz, so no decimal point.
Philip.




--
Carlos Wenzel
ik2yra@...
+39-3284684518
Skype: IK2YRA



--
Carlos Wenzel
ik2yra@...
+39-3284684518
Skype: IK2YRA



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Ian Lee
 

Jerry.

I programmed something similar to what you said. I just added another setting instead of a constant(SECOND_OSC_USB).

The code is shown below.

    if (isUSB){
      si5351bx_setfreq(2, SECOND_OSC_USB - usbCarrier + f  + (isIFShift ? ifShiftValue : 0));
      si5351bx_setfreq(1, SECOND_OSC_USB);
    }
    else{
      si5351bx_setfreq(2, SECOND_OSC_LSB + usbCarrier + f + (isIFShift ? ifShiftValue : 0));
      si5351bx_setfreq(1, SECOND_OSC_LSB);
    }

Also, I would like to ask you an opinion, but now I am using the hotspot in the place where the internet is not available, so I can not use it long. 

I temporarily shifted the usbCarrier (BFO Setting value) when IF-Shift was applied.
I thought IF-Shift was a temporary function that only used for a while, so I could not satisfy both LSB and USB.
The IF-Shift value can be set to + or -, so can set the desired value according to the using mode.

Ian KD8CEC



2018-03-11 5:54 GMT+09:00 Jerry Gaffke via Groups.Io <jgaffke@...>:

I think I was wrong in my previous post, shifting the value of SECOND_OSC_USB won't help.
The audio frequencies through the crystal filter should be strictly a matter of where the BFO is relative to 
the crystal filter passband.  I can't explain why USB audio would be different than LSB audio.

I'm not quite sure what you mean by "IF Shift function".
Can you give an example?

Jerry

On Sat, Mar 10, 2018 at 11:59 am, Mike Woods wrote:
The IF Shift function should only be applied during RX, but it sounds like it is being applied during TX in error in KD8CEC's sketch.  Probably a bug.

However, the op shouldn't be using the IF Shift permanently, he may not have used the BFO calibration function to fix the shift for LSB & USB for the correct passband.



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: RD16HHF1 power curve flattening...some

John <passionfruit88@...>
 

Nice job Nik. Eagerly awaiting your results.

73, John (VK2ETA)

Re: Raduino oscilators. 33mhz and 57mhz " . Documentation says one thing, but this is what I measured.

Michael Shreeve
 

Hi Jerry ( and whoever else is reading) I checked my master oscillator freq , when raduino was cold, and everything else was warmed up, and found that it still says 2k high right off the bat. So, I'm working toward the possibility of calibrating my Leader Counter. I did see a blurb on from WWV where they announced that the 25.0000 signal they are transmitting is now being transmitted on a new Circularly polarized antenna. I will re-measure soon, when calibrated. I did get a lot of good info so far. Thanks for your participation. 

On Fri, Mar 9, 2018 at 10:02 AM, Michael Shreeve <shreevester@...> wrote:
Yes, 2000 is pretty much unbelievable. I'll try a couple of things,
1 measure with a scope looking at the flutter for more accuracy

2 try to check my counter using wwv ft Collins or wherever it comes from now in the same way,(possibly this should be the first step, I've put it off long enough) 

3 after I've determined a semi warm measurement where its been running continuously (I can actually measure the temp with my little orange non contact for fun, and measure the supply and 5v's just in case) , I'll turn off ONLY the uBITX and measure it in the AM . Also, I'll put a little video on for those who might want to see how I'm doing these things.

Remembering that this is a Raduino that is working quite well. This is an exercise so that I'll be VERY familiar,  for my work with an Raduino that doesn't sound so good when used..  

On Fri, Mar 9, 2018 at 9:28 AM, Michael Shreeve <shreevester@...> wrote:
Yes, I'll need to hook a scope to hear the 3 or 4 hz flutter when your spot on. Thanks Jerry. Hopefully doing more today, as its raining here finally.

On Thu, Mar 8, 2018 at 8:32 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
That's an excellent method to measure the frequency of the 25mhz oscillator.
If the receiver has sufficient low frequency audio response, you could monitor the speaker wires with a scope
and get sub hz accuracy when zero-beating.

I'll check my uBitx (tomorrow?), see how much warmup drift I can detect.
The 2.3khz drift (at 25mhz) you reported seems too large by a couple orders of magnitude. 

Jerry




On Thu, Mar 8, 2018 at 07:55 pm, Michael Shreeve wrote:
I don't know if I responded to this. I thought I explained but then maybe not. What I have always done when there is no buffered output is 1 use a receiver and an "antenna" if you will, one that is near the raduino but not touching anything. 2 turn on a somewhat stable generator and, in my case right now, measure the generator frequency directly with a counter. I can hear that generator in the same receiver.. Zero beat the generator , which is being measured, with the 25 MHz signal emanating from the raduino. Turns out it did change as I indicated, merely from heating up. No direct coupling at all for this measurement. At least to the raduino. If I had a communications monitor I wouldn't need to measure the freq of the generator. Or some other stable generator source. Also, I need to try to determine just how accurate my counter is. 
 




--
Michael Shreeve N6GRG




--
Michael Shreeve N6GRG




--
Michael Shreeve N6GRG

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Jerry Gaffke
 

I think my first post on this thread was simply incorrect.
I don't think adjusting  SECOND_OSC_USB  would fix anything.
Unless perhaps we are somehow running up against the edges of the 45mhz filter.
But then I could be wrong, I don't really understand this one yet.

I haven't messed with your code, but do plan to.
Hope to have a full digital station going, using a RasberryPi.

And hope to take a look at your code soon and give some intelligent feedback.
For now, here's some poorly thought out unintelligent feedback:

Perhaps a temporary shift of the BFO relative to the crystal filter passband 
would be a good idea.  Allows an easy zero beat of an AM station such as WWV
when calibrating the rig, for example.  Or could be used to "clarify" the reception of some ham
with a deep voice (has mostly low audio frequencies, perhaps) who has a transmitter tuned
to match it.  Other than that, I'm not sure why any sort of temporary shift would be wanted.

How does this IF-Shift feature get used?
Exactly what does IF-Shift do?

Jerry


On Sat, Mar 10, 2018 at 01:31 pm, Ian Lee wrote:
Jerry.
 
I programmed something similar to what you said. I just added another setting instead of a constant(SECOND_OSC_USB).
 
The code is shown below.
 
    if (isUSB){
      si5351bx_setfreq(2, SECOND_OSC_USB - usbCarrier + f  + (isIFShift ? ifShiftValue : 0));
      si5351bx_setfreq(1, SECOND_OSC_USB);
    }
    else{
      si5351bx_setfreq(2, SECOND_OSC_LSB + usbCarrier + f + (isIFShift ? ifShiftValue : 0));
      si5351bx_setfreq(1, SECOND_OSC_LSB);
    }
 
Also, I would like to ask you an opinion, but now I am using the hotspot in the place where the internet is not available, so I can not use it long. 

I temporarily shifted the usbCarrier (BFO Setting value) when IF-Shift was applied.
I thought IF-Shift was a temporary function that only used for a while, so I could not satisfy both LSB and USB.
The IF-Shift value can be set to + or -, so can set the desired value according to the using mode.
 
Ian KD8CEC
 

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Mike Woods
 

Jerry 

Most commercial rigs have an IF Shift or Passband Tuning (PBT) control.  This control can help with removal of QRM on receive (e.g.by eliminating a strong carrier or another station on the edge of the passband by shifting the passband up or down by a few 100 Hz. It can also compensate for a poorly adjusted frequency response on a signal that is being received (too bassy or too trebly). 

Ian’s software implements just such a control.  It functions in a similar manner to the BFO calibration routine, in fact, but unlike the calibration function, it should only operate on RX. This was the bug - it didn’t turn off on TX.  I checked on my uBITx and found the same problem here.

If you haven’t tried the KD8CEC firmware you should.  It has a number of other worthwhile software features!

73 Mike ZL1AXG


On Sun, 11 Mar 2018 at 11:32 AM, Jerry Gaffke via Groups.Io <jgaffke=yahoo.com@groups.io> wrote:
I think my first post on this thread was simply incorrect.
I don't think adjusting  SECOND_OSC_USB  would fix anything.
Unless perhaps we are somehow running up against the edges of the 45mhz filter.
But then I could be wrong, I don't really understand this one yet.

I haven't messed with your code, but do plan to.
Hope to have a full digital station going, using a RasberryPi.

And hope to take a look at your code soon and give some intelligent feedback.
For now, here's some poorly thought out unintelligent feedback:

Perhaps a temporary shift of the BFO relative to the crystal filter passband 
would be a good idea.  Allows an easy zero beat of an AM station such as WWV
when calibrating the rig, for example.  Or could be used to "clarify" the reception of some ham
with a deep voice (has mostly low audio frequencies, perhaps) who has a transmitter tuned
to match it.  Other than that, I'm not sure why any sort of temporary shift would be wanted.

How does this IF-Shift feature get used?
Exactly what does IF-Shift do?

Jerry


On Sat, Mar 10, 2018 at 01:31 pm, Ian Lee wrote:
Jerry.
 
I programmed something similar to what you said. I just added another setting instead of a constant(SECOND_OSC_USB).
 
The code is shown below.
 
    if (isUSB){
      si5351bx_setfreq(2, SECOND_OSC_USB - usbCarrier + f  + (isIFShift ? ifShiftValue : 0));
      si5351bx_setfreq(1, SECOND_OSC_USB);
    }
    else{
      si5351bx_setfreq(2, SECOND_OSC_LSB + usbCarrier + f + (isIFShift ? ifShiftValue : 0));
      si5351bx_setfreq(1, SECOND_OSC_LSB);
    }
 
Also, I would like to ask you an opinion, but now I am using the hotspot in the place where the internet is not available, so I can not use it long. 

I temporarily shifted the usbCarrier (BFO Setting value) when IF-Shift was applied.
I thought IF-Shift was a temporary function that only used for a while, so I could not satisfy both LSB and USB.
The IF-Shift value can be set to + or -, so can set the desired value according to the using mode.
 
Ian KD8CEC
 

Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Jerry Gaffke
 

OK, so IF-Shift is just a BFO offset (relative to the crystal filter passband) 
that is for receive only, the transmit BFO offset generally stays put.
Makes sense.

I went off into the weeds there because Gerald's original query stated that
In LSB I can adjust the received sound with the IF-Shift with a
> very pleasing effect,
but this does not work the same with USB.

Sounded like there was something more going on.
But could be just that the code didn't quite handle the USB case correctly.

Yes, eventually I'll move on to try some of the newer software.
But for now have my hands full with other projects.

Jerry  


On Sat, Mar 10, 2018 at 02:49 pm, Mike Woods wrote:
Most commercial rigs have an IF Shift or Passband Tuning (PBT) control.  This control can help with removal of QRM on receive (e.g.by eliminating a strong carrier or another station on the edge of the passband by shifting the passband up or down by a few 100 Hz. It can also compensate for a poorly adjusted frequency response on a signal that is being received (too bassy or too trebly). 
 
Ian’s software implements just such a control.  It functions in a similar manner to the BFO calibration routine, in fact, but unlike the calibration function, it should only operate on RX. This was the bug - it didn’t turn off on TX.  I checked on my uBITx and found the same problem here.
 
If you haven’t tried the KD8CEC firmware you should.  It has a number of other worthwhile software features!
 

uBITX Firmware KD8CEC - IF-Shift etc.

ge_clipboard
 

Hi All

Many thanks for all the response concerning the BFO adjustement and about using the IF-shift. I have been playing around with the BFO setting while monitoring myself on another transceiver but as I’m not getting there where I really would like to, I returned to the factory settings. Leastening to the transmitted LSB and USB on another transceiver was never symetric, maybe the steps to set the bfo are not fine enough to do this or I am making something wrong.

Yes, the IF-shift is often a very helpfull feature within crowded bands and as Mike pointed out, it is also nice to be able to adjust the sound of a ssb signal on receive. So, if this could be corrected in the software would be very fine.

Another point I’ve noticed today while using CW, dx-cluster and CAT to jump to a anounced station... When the CWL-, CWU-feature is enabled, then the TX-frequency is not spot on but offset by the amount of the CW-Tone.

Nevertheless, this little rig is a joy to play with, especially with all the added features by Ian‘s software.

Vy 73, Gerald - HB9CEY

#uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

ge_clipboard
 


Hi All

Many thanks for all the response concerning the BFO adjustement and about using the IF-shift. I have been playing around with the BFO setting while monitoring myself on another transceiver but as I’m not getting there where I really would like to, I returned to the factory settings. Leastening to the transmitted LSB and USB on another transceiver was never symetric, maybe the steps to set the bfo are not fine enough to do this or I am making something wrong.

Yes, the IF-shift is often a very helpfull feature within crowded bands and as Mike pointed out, it is also nice to be able to adjust the sound of a ssb signal on receive. So, if this could be corrected in the software would be very fine.

Another point I’ve noticed today while using CW, dx-cluster and CAT to jump to a anounced station... When the CWL-, CWU-feature is enabled, then the frequency is not spot on but offset by the amount of the CW-Tone. 

Nevertheless, this little rig is a joy to play with, especially with all the added features by Ian‘s software.

Vy 73, Gerald - HB9CEY 


Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Allard PE1NWL
 

Jerry,

I believe it works in a similar way as the PBT (or "clarifier") function
in the Raduino v2 software for Bitx40.
https://github.com/amunters/bitx40-raduino-v2/blob/master/PBT.png
It allows the user to slightly shift the BFO frequency from the frontpanel
(only during RX of course).
It's not IF shift in its true sense, but the behaviour is quite similar.
I have the impression that not many BitX40 builders actually installed
this mod, which has always surprised me as I personally find it a very
useful feature.

73 Allard PE1NWL

On Sun, March 11, 2018 00:52, Jerry Gaffke via Groups.Io wrote:
OK, so IF-Shift is just a BFO offset (relative to the crystal filter
passband) 
that is for receive only, the transmit BFO offset generally stays put.
Makes sense.

I went off into the weeds there because Gerald's original query stated
that
 In LSB I can adjust the received sound with the IF-Shift with a
very pleasing effect, but this does not work the same with USB.
Sounded like there was something more going on.
But could be just that the code didn't quite handle the USB case
correctly.

Yes, eventually I'll move on to try some of the newer software.
But for now have my hands full with other projects.

Jerry  

On Sat, Mar 10, 2018 at 02:49 pm, Mike Woods wrote:


Most commercial rigs have an IF Shift or Passband Tuning (PBT)
control. 
This control can help with removal of QRM on receive ( e.g.by (
http://e.g.by ) eliminating a strong carrier or another station on the
edge
of the passband by shifting the passband up or down by a few 100 Hz. It
can also compensate for a poorly adjusted frequency response on a signal
that is being received (too bassy or too trebly). 
 
Ian’s software implements just such a control.  It functions in a
similar
manner to the BFO calibration routine, in fact, but unlike the
calibration
function, it should only operate on RX. This was the bug - it didn’t
turn
off on TX.  I checked on my uBITx and found the same problem here.
 
If you haven’t tried the KD8CEC firmware you should.  It has a number
of
other worthwhile software features!
 

Re: The issues of the TDA2822

Sajid Rahum
 

Farhan

Where can one order the good replacement TDA2822?  There are all sorts of makers but unsure where to get replacement.

My ubitx was sent 2 weeks back; most likely with the older TDA.

Thanks
Sajid/va3qy.