Date   
Re: 2.8 Mhz parasitic signal on 15 and 20m #ubitx

Ashhar Farhan
 

Haha, Raj, He hasnt read our emails?


On Sun 23 Jun, 2019, 9:59 AM , <fr.beckenbauer@...> wrote:
the difference is constant, both when tuning and when changing band

it's a V3

Re: Power supply from a repurposed pc PSU

Ian Reeve
 

Repurposed computer power supplies are a excellent provider of a clean 12v supply and a few minutes work to add suitable connectors,it will do a grand job.


From: BITX20@groups.io <BITX20@groups.io> on behalf of Jim <Jscook@...>
Sent: Sunday, June 23, 2019 6:53:27 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Power supply from a repurposed pc PSU
 
Neat set up there with the banana connectors.



Re: Power supply from a repurposed pc PSU

Thomas Sharka
 

And it's an Antec as well. Antec power supplies have some of the best specs for low RFI emissions. I replaced a bad chinesium power supply in my desktop with an Antec and the background noise levels dropped on my receive by 3 S-Units.



Sent from Yahoo Mail. Get the app


On Sunday, June 23, 2019, 02:03:35 AM EDT, Ian Reeve <ian.radioworkshop@...> wrote:


Repurposed computer power supplies are a excellent provider of a clean 12v supply and a few minutes work to add suitable connectors,it will do a grand job.


From: BITX20@groups.io <BITX20@groups.io> on behalf of Jim <Jscook@...>
Sent: Sunday, June 23, 2019 6:53:27 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Power supply from a repurposed pc PSU
 
Neat set up there with the banana connectors.



Re: Power supply from a repurposed pc PSU

Ian Reeve
 

I can believe that,properly specified and designed in the era when items were of quality,not like today where there is little or no filtering.


From: BITX20@groups.io <BITX20@groups.io> on behalf of Thomas Sharka via Groups.Io <sharkatw@...>
Sent: Sunday, June 23, 2019 7:31:49 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Power supply from a repurposed pc PSU
 
And it's an Antec as well. Antec power supplies have some of the best specs for low RFI emissions. I replaced a bad chinesium power supply in my desktop with an Antec and the background noise levels dropped on my receive by 3 S-Units.



Sent from Yahoo Mail. Get the app


On Sunday, June 23, 2019, 02:03:35 AM EDT, Ian Reeve <ian.radioworkshop@...> wrote:


Repurposed computer power supplies are a excellent provider of a clean 12v supply and a few minutes work to add suitable connectors,it will do a grand job.


From: BITX20@groups.io <BITX20@groups.io> on behalf of Jim <Jscook@...>
Sent: Sunday, June 23, 2019 6:53:27 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Power supply from a repurposed pc PSU
 
Neat set up there with the banana connectors.



Re: 2.8 Mhz parasitic signal on 15 and 20m #ubitx

 

Very strange issue. Final may be oscillating ?


At 23-06-19, you wrote:
Haha, Raj, He hasnt read our emails?

On Sun 23 Jun, 2019, 9:59 AM , < fr.beckenbauer@...> wrote:
the difference is constant, both when tuning and when changing band

it's a V3

Re: 2.8 Mhz parasitic signal on 15 and 20m #ubitx

Thomas DD2TH
 

any tips on how to test or mitigate? I have access to a very well equipped HF lab tomorrow.

Re: 2.8 Mhz parasitic signal on 15 and 20m #ubitx

 

Please edit and leave in parts of the message you are referring to in your reply. In my case
when I dont see trailing message content I dont bother to read or reply as I cant be bothered
to figure it out who anyone is talking to.

Your problem is interesting, please show us a spectrum of it. I have not encountered any such
fixed spacing spurs, they always move closer and farther from carier as I tune.

Raj

At 23-06-19, you wrote:
any tips on how to test or mitigate? I have access to a very well equipped HF lab tomorrow.

Re: #v5 finally got my V5 together and working, PA bias question #v5 #ubitx #pabias

Wayne Leake
 

 I think there is some confusion here.
 some are confusing the draw of the final or finals  with total draw of the whole unit in  TX  mode.
 Wayne WA2YNE


_._,_._,_

New UBitx v5 Cannot Tune in Signals on Field Day + Lots of Birdies

jsternmd
 

Just got my new UBitx v5 with firmware 5.1.  While waiting for the board, I got a nice case from www.amateurradiokits.in and prepared it per instructions.  Only thing I added was creating a single chassis ground, grinding off paint, and using that as a star-point to ground the UBitx board and the other analog/digital PCB that www.amateurradiokits.in includes to facilitate wiring.  When I got the UBitx I hooked it all up and it powers up fine however inot a dummy load the background noise level 'sounds' high and there are birdies in a lot of spots on the ham bands.  I tried to systematically tune to see if any pattern but there were quite loud ones and then quieter ones in between so I gave up for now.  Next since this weekend is ARRL Field Day I tried to tune in stations on 40m and 20m without any success.  Many stations were booming on the UBITx (i double checked and these were S-9 on my Flex) and dozens of S5 or better.  I could not tune in any station to understand the voice.  I thought maybe LSB and USB were somehow reversed because it sounded a lot like the problem if you have the wrong sideband selected.   Any advice appreciated.  

Jerry NY2KW

PS I have a UBitx v3 in a friends house which I will pick up tonight to see how that differs.  Am I correct that I should not swap Raduinos, i.e. not to use the v5.1 Rad on the UBitx v 3 ???

Re: New UBitx v5 Cannot Tune in Signals on Field Day + Lots of Birdies

V Zecchinelli
 

Did you do the following from hfsignals?

"µBITX Tuneup

The µBITX comes pre-aligned. You should do this only if you really think it is out of alignment.

There are three things to be tuned up.

1. PA BIAS

  • Switch off the rig
  • Locate the two PA bias presets (the blue square ones)
  • Set both the presets  to fully clockwise position, gently.
  • Attach a dummy load or a low SWR antenna and switch the rig on
  • Attach a current meter to the power supply so can monitor the current draw
  • Switch on
  • Press the PTT without speaking ( no modulation)
  • The current draw should be between 470 mA and 500 mA
  • Slowly increase one of the two presets until the current increases to by 100 ma
  • Do the same for the other preset (the total current should have increased by 200 ma now)
  • Now, blow a loud HALLLOWWW into the mic.

Does the current flick up?  You’re done with PA Bias

2. Aligning the master clock

All the frequencies of the µBITX are derived by multiplying/dividing to the required frequency from a single 25 MHz crystal. This crystal is rarely at exactly 25 MHz. We have to calibrate this clock to the exact frequency. Here is how it is done

  • Click on the encoder button to display the menu, rotate it to the “Setup On?” and click on to confirm it. This enables the setup options.
  • Tune to an AM broadcast signal with known frequency.
  • Set the dial of the µBITX to read the exact given carrier frequency of the station. If your calibration is out, this will NOT be zero-beat.
  • Click on the encoder button again to display menu and this time it will show up a new option ‘Set Calibration?’. Click to enter this option
  • Now zero-beat to this signal (the frequency display of µBITX will remain the same)
  • Press PTT to save the calibration.

3. Setting the BFO

  • Click on the encoder button to display the menu, rotate it to the “Setup On?” and click on to confirm it
  • Tune to an clean and preferably weak SSB signal to its loudest (not the clearest)
  • Click on the encoder button again to display menu and choose  Theoption ‘Set the BFO’. Click to enter this option
  • Now tune with the encoder for the best sounding audio
  • Press PTT to save the calibration.

Done."



On 6/23/2019 10:55 AM, jsternmd wrote:
Just got my new UBitx v5 with firmware 5.1.  While waiting for the board, I got a nice case from www.amateurradiokits.in and prepared it per instructions.  Only thing I added was creating a single chassis ground, grinding off paint, and using that as a star-point to ground the UBitx board and the other analog/digital PCB that www.amateurradiokits.in includes to facilitate wiring.  When I got the UBitx I hooked it all up and it powers up fine however inot a dummy load the background noise level 'sounds' high and there are birdies in a lot of spots on the ham bands.  I tried to systematically tune to see if any pattern but there were quite loud ones and then quieter ones in between so I gave up for now.  Next since this weekend is ARRL Field Day I tried to tune in stations on 40m and 20m without any success.  Many stations were booming on the UBITx (i double checked and these were S-9 on my Flex) and dozens of S5 or better.  I could not tune in any station to understand the voice.  I thought maybe LSB and USB were somehow reversed because it sounded a lot like the problem if you have the wrong sideband selected.   Any advice appreciated.  

Jerry NY2KW

PS I have a UBitx v3 in a friends house which I will pick up tonight to see how that differs.  Am I correct that I should not swap Raduinos, i.e. not to use the v5.1 Rad on the UBitx v 3 ???

Re: #v5 finally got my V5 together and working, PA bias question #v5 #ubitx #pabias

Dennis KL4LG
 

I had read somewhere that when adjusting the pa bias on the ubitx you did not want to draw more than one amp when measured between transceiver and the power supply.

I have been trying to measure base line voltage, current, and resistance readings, so if I smoke something I can troubleshoot easier.

Beta 1: Nextion files for 5", 7" and 9" screens for CEC software

Mark Hatch
 

Hi all,

Happy to announce that I have completed what i consider "beta 1" for the 5" version of the CEC user interface. Note this user interface is substantially different than the original one released by KD8CEC (see screenshots below). It has been optimized for 800x480 screens and is probably not easily migrated to smaller ones (sorry), But if you are a lucky ham with either a 7" or 9" Nextion, should be a simple matter of opening the ".hmi" file up in the Nextion editor, change the Device settings to match your screen, and compile it to create a tft file. I would also like to acknowledge the original work done by Joe Puma (KD2NFC), without his headstart, i would probably have not been able to complete this.

The files (both .tft and .hmi are in the files section for this group.: Files/AJ6CU Nextion 5-inch files/Nextion5inch June 23, 2019-Beta1/

The following screenshots show some of the new GUI.

MAIN MENU
The main change here was to Group the various functions in to "Applications", "Settings" and "Expert". I did some renaming so that it was clear on the function. Also, Factory Recovery now has its own screen that clarifies what is happening (for dummies like me...). And there is an "About" screen...



ABOUT SCREEN
Every applications should have its own About screen. :-) . Note that in addition to credits and version, there is a list of the 3 known problems.



Save/Recall from Memory
Ok, probably didn't have to redo this one, nothing really wrong about the way it was done. But I added a popup virtual keyboard for adding a label/tag to a memory location. And I also made sure that the Current VFO setting was kept update. That allows you to turn around on your VFO while the Store to Memory is onscreen and you can save it whenever you find something interesting.




BANDSCAN
The Bandscan as originally designed had a number of problems including only able to look at signals 2k at a time and a maximum bandwidth of ~250kHz. This meant that if you scanned 80m, you only got the bottom half of the band. I personally didn't like the way bands were pre-selected, i preferred that the user could select any three in any order. I also added several missing bands.  (For folks outside of USA FCC, it is easy to change these bands from within the .HMI file. Let me know if you would like to do this and I will provide details.) . There are still some room for improvements here. I might experiment with a smaller frequency step and smaller scan bandwidth. But that would be a future effort... 

The first photo below shows the popup selection of offsets from the beginning of the band (I used a mechanism similar to how the mode CWL/USB, etc is selected on the front page). The second photo 
shows a completed band scan that gets to the top of the 3 selected bands. 



CW Decoder
Made some minor GUI changes and renamed this to reflect its functionality. Added a slider switch on left to select between Signal analysis and CW decode.


 

Factory Recovery
Previously, pushing Factory Recovery required you to press it 3 times to run Factory Recovery. But there was no explanation of what it did and why you probably did not want to do it. I added a separate screen with explanation and double confirmation.



Main Menu

Just added direct access to Store/Record to Memory (see upper right). Also liked this spectrum I captured on Field Day. :-) 



My Setup
Not sure anybody cares, but I ran both a 5" and a 3.2" display simultaneously (thanks Ian!) during development. This allowed me to quick answer the question: "What did Ian originally attend for this screen to do?"  It was very helpful and I recommend this to anybody else that is doing development for Nextion.



That's all for now!
73
Mark
AJ6CU

Bitx-40 net? #bitx40

Robert D. Bowers
 

I've been trying off and on for over a year to make a contact with my "new" bitx40, and the closest I came was today... I tried to jump in on field day (I'd forgotten about it until nearly 2 today) and the guy didn't complete the contact - he passed me by after repeating my callsign and his designation.  I've tried calling CQ several times since I got the radio - from the readings I've gotten, I'm getting out (on frequency and it should be a clean signal) - but no replies besides the one.

I've heard that there is a bitx40 net on 40 meters on Sunday afternoon... 7.170 from what I've read.  Will anyone be on there?  I really would like to use this radio for which it was made... qrp SSB ragchewing (and emergency operations as needed).

Bob
N4FBZ

Re: Bitx-40 net? #bitx40

fejohnso
 

I had the same problem, no one answering my calls, then I tried on a Contest day--yep, they answered then. Check the contest pages in QST mag and find one close to you.

On Sunday, June 23, 2019, 2:57:37 PM EDT, Robert D. Bowers <n4fbz@...> wrote:


I've been trying off and on for over a year to make a contact with my "new" bitx40, and the closest I came was today... I tried to jump in on field day (I'd forgotten about it until nearly 2 today) and the guy didn't complete the contact - he passed me by after repeating my callsign and his designation.  I've tried calling CQ several times since I got the radio - from the readings I've gotten, I'm getting out (on frequency and it should be a clean signal) - but no replies besides the one.

I've heard that there is a bitx40 net on 40 meters on Sunday afternoon... 7.170 from what I've read.  Will anyone be on there?  I really would like to use this radio for which it was made... qrp SSB ragchewing (and emergency operations as needed).

Bob
N4FBZ

Re: New UBitx v5 Cannot Tune in Signals on Field Day + Lots of Birdies

Skip Davis
 

Jerry, to start with the xtal filters have different center frequencies so no you can’t switch the two Raduinos and expect it to work. It sounds like you will need to adjust your BFO frequency. So tune a SSB station in until it’s strongest sounding and then adjust the BFO frequency for best understanding of the station. 

Skip Davis, NC9O

On Jun 23, 2019, at 10:55, jsternmd <jsternmd@...> wrote:

Just got my new UBitx v5 with firmware 5.1.  While waiting for the board, I got a nice case from www.amateurradiokits.in and prepared it per instructions.  Only thing I added was creating a single chassis ground, grinding off paint, and using that as a star-point to ground the UBitx board and the other analog/digital PCB that www.amateurradiokits.in includes to facilitate wiring.  When I got the UBitx I hooked it all up and it powers up fine however inot a dummy load the background noise level 'sounds' high and there are birdies in a lot of spots on the ham bands.  I tried to systematically tune to see if any pattern but there were quite loud ones and then quieter ones in between so I gave up for now.  Next since this weekend is ARRL Field Day I tried to tune in stations on 40m and 20m without any success.  Many stations were booming on the UBITx (i double checked and these were S-9 on my Flex) and dozens of S5 or better.  I could not tune in any station to understand the voice.  I thought maybe LSB and USB were somehow reversed because it sounded a lot like the problem if you have the wrong sideband selected.   Any advice appreciated.  

Jerry NY2KW

PS I have a UBitx v3 in a friends house which I will pick up tonight to see how that differs.  Am I correct that I should not swap Raduinos, i.e. not to use the v5.1 Rad on the UBitx v 3 ???

Re: Bitx-40 net? #bitx40

Wayne Leake
 

 I would answer if I were on and heard you clear enough.
 Except for contests.
 I am not into contests, though I was into WAS for a while.
 I did work some 6 SSB for a while after I moved here.
Antenna for 6 is a Hamstick on a heavy magnet mount, sitting on a corrugated metal roof.
 and is at aprox 50 degrees off vertical.or better yet,
 hoping to get a 40 meter dipole or inverted V set up to use with one BITX40.a bit of ragchew.
 Always enjoy a chat,
 Wayne WA2YNE

Re: Bitx-40 net? #bitx40

_Dave_ K0MBT
 

I managed 6 field day contacts working a couple of hours over two days. Running ubitxv3. All on 40 meters. I don't make time for contests more than short time working and I get bored.

Just a few minutes ago I heard ws4jm on 7.277 and returned but apparently he didn't hear me.

73
Dave
k0mbt

Re: Bitx-40 net? #bitx40

_Dave_ K0MBT
 

Just looked a my wife's log book N0BEX. She managed 12 digital contacts with her v3 ubitx.. We worked alternately over a 4 hour period.

Re: #v5 finally got my V5 together and working, PA bias question #v5 #ubitx #pabias

 

Hi Dennis,

The manufacturer has a page for setting the PA bias; I would go by that recommendation for sure:

ubitx tuneup

The instructions call for 100mA above background current requirement for each PA transistor.  This is set by triggering the PTT with no mic input, then adjusting each PA transistor's bias pot.  In the end, with no voice input, your rig should consume about 0.7A

Once that is set, giving a loud "helloooooo" will increase consumption significantly, depending on the chosen band also.

73,


Mark.

Re: Bitx-40 net? #bitx40

Christopher Miller
 

I worked a commercial 100 watt rig last night for several hours. I made maybe 20 contacts. Granted it was 20 and night time, but with several grand worth of equipment I didn’t do any better.

KF4FTR