Date   
#Ubitx #bitx20help. Anyone out there who can work on a Ubitx ? #ubitx

Kelly Mabry
 

I know an elderly gentleman who needs help with his ubitx and is willing to pay for service. Is there anyone who is willing to do mod work for a decent price? He has very little test equipment and is over 70. I am not asking for myself.

73,
Kelly

Re: uBitx not receiving well on CWU or CWL

derek (G4VWI)
 

Hi Mike and others. What is the best way to calibrate CW RX BFO using the KD8CEC firmware.

There appears to be little written about this elsewhere so I was wondering how successful you were in sorting out receive in CWU and CWL by tweaking the CW RX BFO settings? How close did you get to sharpening up the reception of CW signals using the CWU and CWL modes in the KD8CEC firmware?

Did you use a signal generator or CW signal on a known frequency, or did you just tune to a strong CW signal and tweak for best audio? What have others done to obtain the best results?

Best wishes.
Derek G4VWI.


 

Re: Ubitx v5. Must sell.

Martin KM6TCD
 

Tell me more!
km6tcd

 
Sent: Saturday, July 06, 2019 at 9:40 AM
From: "Kelly Mabry" <kmabry2007@...>
To: BITX20@groups.io
Subject: Re: [BITX20] Ubitx v5. Must sell.
Sorry OM;  lower 48 us only
 
 
 
Sent from my Verizon, Samsung Galaxy smartphone
 
-------- Original message --------
From: Werner de Vos <wernerdevos@...>
Date: 7/6/19 4:03 AM (GMT-06:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Ubitx v5. Must sell.
 
Do you ship to the Netherlands? I’m very interested.

73 Werner PA3GYV 

Re: Ubitx v5. Must sell.

Kelly Mabry
 

Sorry OM;  lower 48 us only



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Werner de Vos <wernerdevos@...>
Date: 7/6/19 4:03 AM (GMT-06:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Ubitx v5. Must sell.

Do you ship to the Netherlands? I’m very interested.

73 Werner PA3GYV 

Re: New V5 build results and calibration issues. #ubitx-help #nextion #ubitx #calibration

Mike Kilpatrick
 

Excellent info, Roman. Thanks very much!
I’ve been trying to work out a way to get a more accurate BFO adjustment and without having test gear I’ve been stumped. 
Your procedure does the trick!
73
Mike
VK2DJP


On 6 Jul 2019, at 17:29, Roman <rmach1000@...> wrote:

An update on the BFO adjustment - It turns out that the info I gave about adjusting for the lowest pitch is wrong. If not adjusted correctly, you may end up transmitting both the signal AND the carrier if the filter has been shifted too far (wrong BFO adjustment). For SSB the carrier needs to be suppressed, but it is possible to have the carrier transmitting unintentionally. I found this out while trying to transmit FT8 signals and seeing two spikes on my SDR (running using a separate tiny antenna and laptop in the other room).

I've found the only reliable approach that doesn't involve complex test instruments is to download and use an audio spectrum analyzer program. This is confirmed in other posts I've seen. The one I stumbled upon that seemed to do the job is SpectrumView by WD6CNF.

Here is a procedure that will get you in the ballpark:

1. Disconnect antenna from ubitx, or better, find an unused part of the band with just hiss, no other signals
2. Run audio out from ubitx into PC/Mac/Linux audio in
3. Run spectrum analyzer and configure it to listen to the audio in
4. Turn up volume on ubitx until levels are reasonably high but not clipping in the spectrum analyzer
5. For the ubitx 5 (not the earlier versions), you will want to set the BFO somewhere around 11.055-11.056 MHz as a starting point.
6. I am going to presume that you started with the BFO frequency on the high side, say 11.057 and you are lowering it. As you do so, you should see on the spectrum analyzer that the noise's high frequency roll off frequency increase. At some point it will no longer get any higher no matter what you do with the BFO value. The point you want is right as you touch that max value. You might have to back off and watch the max value decrease, then adjusting again until you find the maximum.
7. Save the BFO frequency using the PTT where you get maximum high frequency response. I found that the BFO frequency was about 1.5-2 kHz lower than the frequency where the I got the most "bass" response in my headphones, thus the final result had less bass response.
8. If you have an SDR, you can double-check your results: Run ubitx into a dummy load and have an SDR with separate tiny (or no) antenna nearby, either run WSJT-X "Tune", or a single frequency of audio into the ubitx mic. The SDR will likely be sensitive enough to pick up stray RF (even with the dummy load) and you should be able to see only one, not two spikes on the display (make sure you zoom in maximum to a narrow bandwidth view).

After this adjustment, I've managed to make a few longer distance FT8 contacts, i.e. Seattle to Alaska on 40m.

I know the procedures I've written are long and seem complicated, but I do that on purpose to give the most information possible especially for those who may be stuck on some detail they read elsewhere. I do have one caveat: If you have a properly factory tuned ubitx, I would not recommend adjusting the ubitx calibration or BFO.

Hope this info helps someone,
Roman K7TXL

Re: Ubitx v5. Must sell.

Werner de Vos
 

Do you ship to the Netherlands? I’m very interested.

73 Werner PA3GYV 

Re: Remote access - I want to connect ubitx to Raspberry PI and remote in #remoteaccess

Roman
 

There's an article in the Oct 2018 QST about a ubitx-based "appliance" interfacing with, get this, not a raspberry pi, but an Asus Tinkerboard - the creator, Chuck Kelly, found that a pi 3 does not have enough processor power to decode FT8 in a timely manner.

Seems like if you are going to do audio streaming and maybe FT8, a Tinkerboard would probably be called for or possibly the new pi 4, which seems to have similar specs to the Tinkerboard. Beware though, the pi 4 has the micro hdmi outputs so adapters are required. I don't have any experience with either, although I've used a pi 3 for WSPR with good success.

73
Roman, K7TXL

Re: New V5 build results and calibration issues. #ubitx-help #nextion #ubitx #calibration

Roman
 

An update on the BFO adjustment - It turns out that the info I gave about adjusting for the lowest pitch is wrong. If not adjusted correctly, you may end up transmitting both the signal AND the carrier if the filter has been shifted too far (wrong BFO adjustment). For SSB the carrier needs to be suppressed, but it is possible to have the carrier transmitting unintentionally. I found this out while trying to transmit FT8 signals and seeing two spikes on my SDR (running using a separate tiny antenna and laptop in the other room).

I've found the only reliable approach that doesn't involve complex test instruments is to download and use an audio spectrum analyzer program. This is confirmed in other posts I've seen. The one I stumbled upon that seemed to do the job is SpectrumView by WD6CNF.

Here is a procedure that will get you in the ballpark:

1. Disconnect antenna from ubitx, or better, find an unused part of the band with just hiss, no other signals
2. Run audio out from ubitx into PC/Mac/Linux audio in
3. Run spectrum analyzer and configure it to listen to the audio in
4. Turn up volume on ubitx until levels are reasonably high but not clipping in the spectrum analyzer
5. For the ubitx 5 (not the earlier versions), you will want to set the BFO somewhere around 11.055-11.056 MHz as a starting point.
6. I am going to presume that you started with the BFO frequency on the high side, say 11.057 and you are lowering it. As you do so, you should see on the spectrum analyzer that the noise's high frequency roll off frequency increase. At some point it will no longer get any higher no matter what you do with the BFO value. The point you want is right as you touch that max value. You might have to back off and watch the max value decrease, then adjusting again until you find the maximum.
7. Save the BFO frequency using the PTT where you get maximum high frequency response. I found that the BFO frequency was about 1.5-2 kHz lower than the frequency where the I got the most "bass" response in my headphones, thus the final result had less bass response.
8. If you have an SDR, you can double-check your results: Run ubitx into a dummy load and have an SDR with separate tiny (or no) antenna nearby, either run WSJT-X "Tune", or a single frequency of audio into the ubitx mic. The SDR will likely be sensitive enough to pick up stray RF (even with the dummy load) and you should be able to see only one, not two spikes on the display (make sure you zoom in maximum to a narrow bandwidth view).

After this adjustment, I've managed to make a few longer distance FT8 contacts, i.e. Seattle to Alaska on 40m.

I know the procedures I've written are long and seem complicated, but I do that on purpose to give the most information possible especially for those who may be stuck on some detail they read elsewhere. I do have one caveat: If you have a properly factory tuned ubitx, I would not recommend adjusting the ubitx calibration or BFO.

Hope this info helps someone,
Roman K7TXL

Re: Remote access - I want to connect ubitx to Raspberry PI and remote in #remoteaccess

Tom, wb6b
 

Hi,

Audio streaming seems to be a missing element in trying to remote control your shack. 

Has anyone tried these for a web browser/server based remote controller solution? (These are just a few things I found with a Google search for html RTC services).

https://www.html5rocks.com/en/tutorials/webrtc/basics/
https://webrtc.org
https://github.com/muaz-khan/RTCMultiConnection

Are there other DYI solutions. The team builder link looks good for a hosted (paid ?) solution, though.

Tom, wb6b

Re: Antuino 2.0

VISWANATHAN R ELAYIDOM
 


On Sat, Jul 6, 2019, 10:00 AM VISWANATHAN R ELAYIDOM via Groups.Io <vu2eaf9=gmail.com@groups.io> wrote:

On Sat, Jul 6, 2019, 9:33 AM Ashhar Farhan <farhanbox@...> wrote:
I suspect (i havent checked) that this is because of inaccurate adc readings. Sometimes the adc takes repetitive readings to get it right.
- f

On Fri 5 Jul, 2019, 9:42 PM Rob Bleumer, <rob.bleumer@...> wrote:
Hi all,
I do not talking about the genetal enclosure but inside the enclosure protect AD8307 and the 25Mhz filters and amplifiers with an extra hf shielding.
Rob PA0RBL

--
Which is the latest version


--
Which is the latest version

Re: Antuino 2.0

VISWANATHAN R ELAYIDOM
 


On Sat, Jul 6, 2019, 9:33 AM Ashhar Farhan <farhanbox@...> wrote:
I suspect (i havent checked) that this is because of inaccurate adc readings. Sometimes the adc takes repetitive readings to get it right.
- f

On Fri 5 Jul, 2019, 9:42 PM Rob Bleumer, <rob.bleumer@...> wrote:
Hi all,
I do not talking about the genetal enclosure but inside the enclosure protect AD8307 and the 25Mhz filters and amplifiers with an extra hf shielding.
Rob PA0RBL


--
Which is the latest version

Re: Antuino 2.0

Ashhar Farhan
 

I suspect (i havent checked) that this is because of inaccurate adc readings. Sometimes the adc takes repetitive readings to get it right.
- f

On Fri 5 Jul, 2019, 9:42 PM Rob Bleumer, <rob.bleumer@...> wrote:
Hi all,
I do not talking about the genetal enclosure but inside the enclosure protect AD8307 and the 25Mhz filters and amplifiers with an extra hf shielding.
Rob PA0RBL

Re: Remote access - I want to connect ubitx to Raspberry PI and remote in #remoteaccess

kj5wi@...
 

teamviewer host
Teamviewer host on the pi from above link will allow remote connection without opening anything. When the webpage opens, scroll down and watch for the pi logo on the right side.  The Sun City Georgetown uses Teamviewer for remote access to their club station radios.

Frank(kj5wi) 

Re: ubotx Ver 4

 

Caliberate and re check.

At 06-07-19, you wrote:
On my ubitx V4, I have noticed a difference between the display and the real frequency of about 5KHz at 28MHz and about 1KHz at 7MHz.
Any suggestion?

Re: Questions on UBitX upgrade (simple) to Nextion #nextion #parts

Mark Hatch
 

I purchased just the front panel from Sunil. But no assurance that he still offers this. Hard to believe this was a profitable transaction for him.

Didn’t need anything else as the other parts just swapped in. I did buy a 3.2” and that required some metal work and a bezel that you can order thru thinguniverse if you don’t have a 3D printer. 

Mark

ubotx Ver 4

IZ4SJP Carlo
 

On my ubitx V4, I have noticed a difference between the display and the real frequency of about 5KHz at 28MHz and about 1KHz at 7MHz.
Any suggestion?

Re: Questions on UBitX upgrade (simple) to Nextion #nextion #parts

JT Croteau
 

You will need to talk to Sunil.


On Fri, Jul 5, 2019, 15:09 wcurlew@... <wcurlew@...> wrote:
I have the square blue UBitX case ($43) and I love the radio. Thinking of upgrading to a Nextion display. Looks like the $12 front panel that takes a 2.8" display would accomplish this without having to get a whole new case. Can this be confirmed, and could folks recommend a nextion part number/source?

Anything else I need to buy to support the swap-out?

Thanks
Bill KC1JTS

Questions on UBitX upgrade (simple) to Nextion #nextion #parts

wcurlew@juno.com
 

I have the square blue UBitX case ($43) and I love the radio. Thinking of upgrading to a Nextion display. Looks like the $12 front panel that takes a 2.8" display would accomplish this without having to get a whole new case. Can this be confirmed, and could folks recommend a nextion part number/source?

Anything else I need to buy to support the swap-out?

Thanks
Bill KC1JTS

Re: Remote access - I want to connect ubitx to Raspberry PI and remote in #remoteaccess

Jens Kaemmerer
 


I am running my uBitx v5 24/7 - connected to a Raspberry PI 3 as an FT8 'monitor'. I can access
it from anywhere on any device (laptop, iPhone, iPad) with VNC and OpenVPN. A big advantage
of this setup is that the radio is always 'ready for action' - even if I have only a few minutes time
to transmit (FT8 or FT4 or FS8).

As others have mentioned, the Raspberry PI comes pre-installed with VNC.

OpenVPN can easily be installed with:

http://www.pivpn.io/

OpenVPN allows to access the Raspberry PI VNC server with the same IP address / portnumber
used in your in your local network (without VPN connection). OpenVPN client applications are
available for all major platforms.

Of course, once you have established the OpenVPN connection, you can access any other
part of your home network (fileserver, printer, etc.) as well - not just VNC running on the
Raspberry PI.

I do not not recommend to directly enable a port to connect to the Raspberry PI VNC server,
instead enable a port to connect to the OpenVPN server.

-jens (KM6ZJV)

Re: Remote access - I want to connect ubitx to Raspberry PI and remote in #remoteaccess

Doug W
 

Evan beat me to it and I completely agree with his advise to get VNC setup on your network first then setup the port forwarding.  Just so I can feel like I am doing something useful here's an andriod client app https://play.google.com/store/apps/details?id=com.realvnc.viewer.android
--
www.bitxmap.com