Date   

Re: Transverter for 6 meters on eBay

Lou KI5FTY
 

Hi Jens, do you have a link to the crystal and heater you used?

73
Lou KI5FTY



On Thu, Jun 4, 2020 at 12:48 AM Jens / DH1AKY <je_wa@...> wrote:
Hi Noel,

I've changed the crystal to a big one and added a 40°C crystal heater. Works very well, used Proficio and 2m version and a PA in the last 2m contests.

73, Jens/DH1AKY


Re: Transverter for 6 meters on eBay

Jens / DH1AKY
 

Hi Noel,

I've changed the crystal to a big one and added a 40°C crystal heater. Works very well, used Proficio and 2m version and a PA in the last 2m contests.

73, Jens/DH1AKY


Re: Swr meter with oled display

barry halterman
 

Thanks Terry! I now have a starting point.
73
Barry
K3bo


Re: Swr meter with oled display

Terry VK5TM
 


Swr meter with oled display

barry halterman
 

Has anyone hooked up a small .96 inch oled display using a nano for swr measurements?
If so could you point me in the correct direction. I have hardware but no sketch.
TU
Barry


Re: Transverter for 6 meters on eBay

 

I bought the 2 meter version and used it for quite a while on 2 meter SSB, but it drifted a lot. I was going to replace the 116mhz crystal onboard to something more stable but never got motivated. Mine put out a steady 10 watts, not too bad really.

Joel
N6ALT


bitx40 and ubitx version 3

Cfavor@...
 

have bitx40 and ubitx v3 for sale 
with amateurradiokits cases never been wired
looking for $50 for bitx40 
$100 for ubitx
Carey


Re: SOLVED! Re: Odd (and non-functional) #RX behavior #rx #v5

Evan Hand
 

Glad you were able to get it going!

The is supposed to be a ubitx net every Sunday at 3:00 PM local time.  I have tried Eastern and Central and never hear a peep.  The frequency is 7.277 MHz.  You could try it there.

73
Evan
AC9TU


SOLVED! Re: Odd (and non-functional) #RX behavior #rx #v5

Tim Helming
 

Evan, thanks a million.

Filename, schmilename...what difference could THAT make? :P

I missed the lack of "V5" in the filename of the 1.2 firmware I had uploaded. I was so concerned about picking the one that supported the Nextion screen that I didn't look closely enough at the beginning of the filename.

Now I'm cooking!

I appreciate your and Reed's help.

73 and see you on the air, I hope

Tim


Re: Odd (and non-functional) #RX behavior #rx #v5

Evan Hand
 

Tim,
Did you verify that you have the correct KD8CEC code?  If so, then you can enter the BFO value in the USB Calibration field of the Memory Manager and then write the values to the ubitx Nano.



Above is a screenshot of one of my early v5 calibration settings.  All of my ubitx are in surgery, so I cannot get a clean capture of current values.

NOTES:
1 - Need to read and write the values from the ubitx each time.
2 - The values are not used until you reboot the ubitx Nano.  This includes removing the power from the USB cable.
      (be sure to disconnect by pressing the changed connect button before removing the USB cable, otherwise, you will need to close and restart the Memory Manager program)
3 - It is best to save values between trials to a file, renaming the file save location each time (i.e. Trial1, Trial2, ...)
4 - Since this capture, I found out that you only need to enter the USB Calibration, the LSB is not used and should be 0

The zero beat for frequency calibration is to be done against an AM station that you can receive and know the frequency.  Most in the US can get one of the WWV frequencies, 5 MHz, 10 MHz, 15 MHZ, or 20 MHz.
The BFO setting is through the "noise" on a frequency without a signal. You do need to connect to an antenna for this test, AND you need a microphone connected to your PC and use the Chrome browser for the BFO Tuning Aid to work.  What you see in the video from Ashhar Farhan is the noise "plateau" from a clear frequency.

WWV info:
https://www.nist.gov/system/files/documents/calibrations/sp432-02.pdf

If you cannot receive any of the WWV frequencies, then you can also us an AM station, as long as you know the exact frequency, and you take the time to tune down to the frequency on the dial (There is a shortcut direct entry on one of the KD8CEC screens).

Hope this helps
73
Evan
AC9TU


Re: Transverter for 6 meters on eBay

Arvo W0VRA
 

That's cool!

I bought the one I listed last summer when 6m was hoppin', and didn't really use it.


Re: Odd (and non-functional) #RX behavior #rx #v5

Tim Helming
 

Thanks, Evan

For the calibration, my rig does not pick up the "birdie" tones at the frequencies shown (the video has one on 40m and there's another that I've seen reference to on 20m). I can't use the calibration aide to center the tone since there isn't one.

For BFO tuning, my BFO is so far away from 11.055.500 that it would literally take hours and hours of spinning the dial to get to it. And yet, as I mentioned in an earlier post, either I'm entering the 11055000 in the wrong field in the Memory Manager, or my rig is acting odd.


Re: Pre driver and driver transistors

MadRadioModder
 

Again, you-all might do a little research by reading all of the posts from about a year and a half ago.  No sense reinventing the wheel.  There were several people working this issue… redesigning output transformers, changing the feedback components on the finals (oh yes, those parts are frequency dependent), adding another drive state, changing bypassing). As I recall, the group consisted of a DL, a VK, a K9, and another euro station… some of these people have since left the group.  You might reread all of that dialogue and weigh that in with  Allison’s ever-present posts.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Gérard
Sent: Wednesday, June 3, 2020 11:12 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Pre driver and driver transistors

 

Hello,

 

I have not yet asked myself the question to replace some 3904. For me the 2n2222 is an "old Go anywhere " transistor.It's work fine, but it is at least over 50 years old, I was already changing some in the years  70/80. We really should study the case.
Take a more "modern"? Ex :Bf 959 Bandwitch 1G against 300mo to a 2n2222.

 But the change does not stop there. It may be necessary to adjust resistances emitters, base. See if anyone has already put transistors other than 2n2222. Take the µbitx version6 schematic  and find an equivalent to the BFR93w.

 

 

Le mer. 3 juin 2020 à 17:32, ohwenzelph via groups.io <Ohwenzelph=yahoo.com@groups.io> a écrit :

fwiw
Actually, I am not so concerned about the power out being equal across the bands. The concern is to have reasonably enough power out on the 10 meter end. And if 10 and 12 and 15 meters are open you don’t need very much power. At the 80/40 end I don’t mind if there is a lot more power, granted not QRP, but if summer thunderstorms are making a.a racket and you want to be heard, then it becomes a question of how do I cool those heat sinks. Why do they need to be equal? With increased power harmonics and spurs became more of a concern but my impression is that Farhan has fixed those. One can always try to  optimise efficiency but that is less of a concern if not running on batteries or portable. I am still trying to understand the concept of IMD and the square root of negative one...
jer aa1of


Virus-free. www.avg.com

--

…_. _._


Re: Pre driver and driver transistors

ajparent1/kb1gmx <kb1gmx@...>
 

Over the last three years (see the old and very large thread) the following were tried...

MPSA10,
2n2222a
2n3866
2n5109

The BF959 is a low power VHF transistor and would be a poor performer
except as replacement for Q90  maybe, the BFR106 was better.   The BF959
gain falls off fast above 20ma, undesired for high peak current applications.

Desired characteristics are:
Pdiss greater than 800mw (most metal cans do better than plastic).
Vcc max not less than 30V
Max collector current not less than 200ma.
Ft more than 800mhz , and does not decrease at high current.

I tried a few UHF parts I had for the 1W region with Ft of 5ghz and
they did not like the board layout (undesired oscillation). One issue 
is get enough gain at 30mhz and it is unstable due to layout.

Allison
---------------------------------
No direct email, it goes to bit bucket due address harvesting in groups.IO


Re: Pre driver and driver transistors

MadRadioModder
 

You may be taking this “equal across the bands” statement too literal.  If you go back to the actual post conversations, that was not necessarily the original goal.  It started out as the statement “why is the power so low on 10 meters”…

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of ohwenzelph via groups.io
Sent: Wednesday, June 3, 2020 10:33 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Pre driver and driver transistors

 

fwiw
Actually, I am not so concerned about the power out being equal across the bands. The concern is to have reasonably enough power out on the 10 meter end. And if 10 and 12 and 15 meters are open you don’t need very much power. At the 80/40 end I don’t mind if there is a lot more power, granted not QRP, but if summer thunderstorms are making a.a racket and you want to be heard, then it becomes a question of how do I cool those heat sinks. Why do they need to be equal? With increased power harmonics and spurs became more of a concern but my impression is that Farhan has fixed those. One can always try to  optimise efficiency but that is less of a concern if not running on batteries or portable. I am still trying to understand the concept of IMD and the square root of negative one...
jer aa1of


Virus-free. www.avg.com

--

…_. _._


Re: Pre driver and driver transistors

Gérard <kabupos@...>
 

Hello,

I have not yet asked myself the question to replace some 3904. For me the 2n2222 is an "old Go anywhere " transistor.It's work fine, but it is at least over 50 years old, I was already changing some in the years  70/80. We really should study the case.
Take a more "modern"? Ex :Bf 959 Bandwitch 1G against 300mo to a 2n2222.
 But the change does not stop there. It may be necessary to adjust resistances emitters, base. See if anyone has already put transistors other than 2n2222. Take the µbitx version6 schematic  and find an equivalent to the BFR93w.


Le mer. 3 juin 2020 à 17:32, ohwenzelph via groups.io <Ohwenzelph=yahoo.com@groups.io> a écrit :
fwiw
Actually, I am not so concerned about the power out being equal across the bands. The concern is to have reasonably enough power out on the 10 meter end. And if 10 and 12 and 15 meters are open you don’t need very much power. At the 80/40 end I don’t mind if there is a lot more power, granted not QRP, but if summer thunderstorms are making a.a racket and you want to be heard, then it becomes a question of how do I cool those heat sinks. Why do they need to be equal? With increased power harmonics and spurs became more of a concern but my impression is that Farhan has fixed those. One can always try to  optimise efficiency but that is less of a concern if not running on batteries or portable. I am still trying to understand the concept of IMD and the square root of negative one...
jer aa1of


Re: Pre driver and driver transistors

ohwenzelph
 

fwiw
Actually, I am not so concerned about the power out being equal across the bands. The concern is to have reasonably enough power out on the 10 meter end. And if 10 and 12 and 15 meters are open you don’t need very much power. At the 80/40 end I don’t mind if there is a lot more power, granted not QRP, but if summer thunderstorms are making a.a racket and you want to be heard, then it becomes a question of how do I cool those heat sinks. Why do they need to be equal? With increased power harmonics and spurs became more of a concern but my impression is that Farhan has fixed those. One can always try to  optimise efficiency but that is less of a concern if not running on batteries or portable. I am still trying to understand the concept of IMD and the square root of negative one...
jer aa1of


Re: Odd (and non-functional) #RX behavior #rx #v5

Evan Hand
 

Tim,
I meant to include the v6 video by Ashhar Farhan for calibration.  The same steps and the BFO tool can be used, the controls and how to bet to the BFO calibration is different (as you will see since you have already set the BFO).  You will need to use the "yellow box" setup menu that you get when you press the encoder.

Calibration of v6:
https://www.youtube.com/watch?v=t6LGXhS4_O8

BFO Tuning Aid:
https://www.hfsignals.com/index.php/bfo-tuning-aid/

73
Evan
AC9TU


Re: Odd (and non-functional) #RX behavior #rx #v5

Evan Hand
 

Tim,
I believe that you have the wrong KD8CEC version loaded on your v5 ubitx.  That is why it is not working.  In the KD8CEC software, there is a boundary check that keeps you from setting the USB Calibration (BFO) to a value outside of a reasonable range (do not remember the exact value).  The version of ubitx prior to v5 had a 12 MHz crystal SSB filter, the v5, and v6 have 11.059 MHz filters.  The BFO then needs to be 2,700 Hz lower than the nominal SSB crystal frequency, with adjustments for minor crystal variations.

Go to this GitHub page: 
https://github.com/phdlee/ubitx/releases/tag/v1.20 
and be sure to get the version uBITXV5 and load that sketch into your Nano.   Then set the USB Calibration to the 11055500 value and perform the BFO rough calibration.  Verify the calibration using the zero beat method against a known short wave station, then do a final BFO calibration.  The steps for the v6 are similar to the v5 with the KD8CEC software.  The stock v5 software put the rig into transmit mode at 10.000000 MHz for the calibration step into a dummy load. 

The Master Calibration value is to set the displayed frequency to the correct value.  Since you have adjusted this, you will need to recalibrate the ubitx once you can receive a signal like WWV.

Hopefully this will fix your issues.
73
Evan
AC9TU


Re: Odd (and non-functional) #RX behavior #rx #v5

Tony Vandenborn
 

Hello Tim

Are you shure you really wrote the USB frequency into the Raduino board ?
You have to connect the radio to the PC ('Open'); then 'Read from uBITX', followed by 'Decode'. Now you can see what value is exactly stored in the radio.
Now fill in the desired frequency in 'USB Calibration'. Then 'Encode', and 'Write to uBITX'. Finally you have to close the connection with the radio.
As long as the Memory Manager is connected to the radio, it more or less works. I don't know if it is really necessary, but I always power off the radio from its owen supply before connecting the USB connector to the pc...

Hope this helps !

Tony ON6NT

Op wo 3 jun. 2020 om 05:29 schreef <wt1im@...>:

Please advise as to which exact setting in the memory manager needs to be on 11055500. USB Calibration is the only one that is close to that figure, but if I set it to that in Memory Manager, the BFO setting on board the radio does not show that figure.