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How to check LPF / relay failure that may be lowering power output

sumit basu
 

I get about 12 watts at 80m which progressively goes down to about 6 / 7 watts at 30m when measuring with a watt meter in CW mode. From 20m on-wards the watt-meter momentarily deflects when the key is pressed with ptt clicking in and instantly the needle goes down no transmit power after that. If i try test point 7 on the board with a wire to the watt-meter on 20m i get a deflection indicating about 5 watts progressively going down to 1 watt or less in 10m. Testing from test point 8 for these bands shows no deflection other than when the ptt clicks like earlier. I doubt something with the LPF's and /or the relays, how can i check this. Replacing relays is difficult - can anyone guide me a troubleshoot?
I was calling CQ on CW on 20m with 24 volts to the PA, the meter was showing power output around 25 watts and then came smoke. The transmit / receive was not working after that and after replacing both the 510's, Q15 and K1 things got OK except transmitting on 20m till 10m.
I am using v5 board with the cec 1.2

Sumit Basu
VU2DTF


Re: BITX Discussed At Virginia Radio Club Meeting

t.rohner@...
 

Pretty cool to see such relatively simple circuits in times of SDR and FPGA's

73 Thomas


Re: How to reduce RF power out stepwise with a ubitx V3?

Jep
 

Evan and Raj, 
Thank you for the limpid suggestions; then I will consider installing a pot with a long axe to avoid long wires travelling over the circuit board.
Alternatively, as I do normally use the ubitx for the 40m band only, even a simple switch and a small relay to select  hi/lo power could be an easy approach to reduce power at the level required by a Ten Tec 405 power amplifier. 
Best greetings 
Jep


Re: How to reduce RF power out stepwise with a ubitx V3?

Evan Hand
 

Jep,
Others on this board have installed multiple RV1s with a switch to select between them or to flatten power across bands, to relays driven by the band selector signals.  Since the power out varies so much by the band, if you are not going to work only one band, I would suggest that you bring it out to the front panel, and through experimentation work out by band the correct setting for the mode you want to use.  That would be easier if you had a scale for the control.

The above is just a suggestion.  You can search the board or the internet for flattening ubitx power output by band.
https://ubitx.net/2018/06/28/2539/

73
Evan
AC9TU


Re: Nextion and ubitx v3 pin outs #nextion #v3

Evan Hand
 

Here is the link:
http://www.hamskey.com/2018/06/ubitx-with-nextion-lcd-cec-firmware.html

You will need to scroll down past the description on how to install the software to the schematic that shows the connection to the header for the 16x2 display.  Make sure that you use the correct version of the software for the v3/v4, and that you pick the version that is not for the stand-alone signal analyzer.

I am out on a motorcycle ride for the next 2 days, so do not have access to all of my data and resources.  Hopefully, this can get you started.
73
Evan
AC9TU


Re: How to reduce RF power out stepwise with a ubitx V3?

Jep
 

Yes Ray, certainly that works:
I would prefer a panel control of power out to have the possibility to run the ubitx as a low-power driver or as a standalone rtx at its full power capability without necessity to access the cabinet inside to change modality. I must argue that the only way to have this feature is to move RV1 to the front panel?
Bests, Jep


Re: BITX Discussed At Virginia Radio Club Meeting

Reed N
 

I was referring to the YouTube video's time stamp (https://www.youtube.com/watch?v=VHSr-v4QO7Q&t=16m52s), which is not explicitly related to any computer time keeping strategy, so not sure what you're trying to say, Arv. Where will Unix time be included?


Reed


Re: How to reduce RF power out stepwise with a ubitx V3?

 

Turn RV1 clockwise to reduce power!

Raj

At 15/06/2020, you wrote:
10W RF out from the ubitx might be too much for a 50-100W power amplifier.
How could RF out be reduced stepwise down to 1W?
Any suggestion is very welcome
Jep, IZ0WIT


How to reduce RF power out stepwise with a ubitx V3?

Jep
 

10W RF out from the ubitx might be too much for a 50-100W power amplifier. 
How could RF out be reduced stepwise down to 1W?
Any suggestion is very welcome
Jep, IZ0WIT 


Re: Nextion and ubitx v3 pin outs #nextion #v3

rpremooak@...
 

On Sun, Jun 14, 2020 at 11:58 PM, <rpremooak@...> wrote:
Does anyone have the proper pin outs for nextion display attachment to a v3.  I have the black cable on Pin1; Red on Pin2 this was opposite of v6 hookup for power and ground. 

On the v6 I connected yellow to pin5; and Blue to Pin11

I looked at the schematic but the labeling/design is different between the two radios and v3 was not labelled for this display.
V6
Nano D8 (Pin11 on display connector) Touch
Nano D9 (Pin5 on display connector) D_C

I'll try to find the Nano usage in the code.  no guess yet.


Nextion and ubitx v3 pin outs #nextion #v3

rpremooak@...
 

Does anyone have the proper pin outs for nextion display attachment to a v3.  I have the black cable on Pin1; Red on Pin2 this was opposite of v6 hookup for power and ground. 

On the v6 I connected yellow to pin5; and Blue to Pin11

I looked at the schematic but the labeling/design is different between the two radios and v3 was not labelled for this display.


Re: v6 with a 7" Nexion nx80 #ubitxv6 #nextion

rpremooak@...
 

Mike fixed the issue on the site, he needed to whitelist my IP from comcast.


Re: #ubitx-help #ubitx-help

MVS Negi
 

Most likely ..yes


On Sun, Jun 14, 2020 at 10:07 PM Tyler Friesen <kf7fy92@...> wrote:
I do the antenna set up parallel to the power lines, but they are over 100 feet away, I don’t know if that would still cause a problem?


Re: BITX Discussed At Virginia Radio Club Meeting

Arv Evans
 



As Windows merges closer and closer to Linux you can soon expect UNIX time to 
be included in it...if not already there.  In Linux, UNIX, and BSD the "date" command 
provides all the relevant conversions from the UNIX Epoch Time number.  


Arv  K7HKL
_._

_._

On Sun, Jun 14, 2020 at 5:21 PM Reed N <greenkid336600+groupsio@...> wrote:
16:52 is the time stamp specifically for BiTX stuff

Definitely worth watching the whole way through, though!


Reed


Re: #ubitx-help #ubitx-help

Blobby Harvey <blobbyharvey4@...>
 

I had a similar problem and after doing a bit of RDF work located a cheap chinese power adaptor. Through it in the rubbish and problem solved. 

73’s Shane ZL2SH

On Mon, 15 Jun 2020 at 7:19 AM, MVS Sarma <mvssarma@...> wrote:
My dipole antenna is aroin 30 tpb40 ft but at elevated location on top of 3rd floor. I am working reasonably well. 

Sarma vu3zmv

On Sun, 14 Jun 2020, 10:07 pm Tyler Friesen, <kf7fy92@...> wrote:
I do the antenna set up parallel to the power lines, but they are over 100 feet away, I don’t know if that would still cause a problem?


Re: uBitX on CW #v6

Reed N
 

Dirty little secret: I've never actually run my uBiTX with a "proper" key. I have the menu set to "Handkey", and use the PTT like a straight key, so if I hold it down, I get as long a dah as I want. Are you saying that even if you hold down the PTT, it doesn't continue transmitting the CW?


Reed


Re: BITX Discussed At Virginia Radio Club Meeting

Reed N
 

16:52 is the time stamp specifically for BiTX stuff

Definitely worth watching the whole way through, though!


Reed


Re: BITX Discussed At Virginia Radio Club Meeting

Jim Wennblom
 

This is an awesome video.

Thanks,

73

Jim

K0HW


Re: ESP32 for uBitx v6 #firmware #raduino #ubitxv6 #v6

Bob Lunsford
 

I am sure a bilingual document re the V6 will be useful to someone, maybe many and create more interest with Spanish speakers. Thanks, I'll also take a look at it.

On Sunday, June 14, 2020, 1:52:00 PM EDT, ramonlh@... <ramonlh@...> wrote:


Hola,

he subido un pequeño documento PDF con la descripción del proyecto. https://github.com/ramonlh/ubitx32/tree/master/doc

El estado actual es que las funciones básicas están en funcionamiento. No funcionan IFS ni ATT.

Las cosas que tengo que hacer de forma inmediata:
  • Completar las funciones que faltan: IFS y ATT.
  • Completar las páginas web faltantes.
  • Probar CW en transmisión.
Como explico en el documento, el desarrollo está hecho con UECIDE y no sé si compilará con Arduino IDE. UECIDE es sencillo y mucho más rápido al compilar. Si alguien está interesado en compilarlo estoy a su disposición.

Saludos,
Ramón
=================================================================================
Hello,
 
I have uploaded a small PDF document with the project description. https://github.com/ramonlh/ubitx32/tree/master/doc
 
The current state is that the basic functions are working. IFS and ATT do not work.
 
The things that I have to do immediately:
Fill in the missing functions: IFS and ATT.
Fill in the missing web pages.
Test CW in transmission.
As I explain in the document, the development is done with UECIDE and I don't know if it will compile with Arduino IDE. UECIDE is simple and much faster when compiling. If anyone is interested in compiling it, I am at your disposal.
 
Cheers,
Ramon


Re: #ubitx-help #ubitx-help

Gordon Gibby
 

More has to do with whether or not there is arcing in that particular powerline. If there is, you can be an eighth of a mile away and still have tremendous interference.  if there isn’t, you should be fine but you always want to be far enough away that if a wire breaks there’s no chance of contact.  And that is really serious!!


On Jun 14, 2020, at 17:26, Bob Lunsford via groups.io <nocrud222@...> wrote:


100-ft should not be a problem. My antenna is about 30-ft or so from power lines feeding houses on my street and it has very little effect on received QRN, etc. But no two installations act exactly the same. Experiment, experiment.

On Sunday, June 14, 2020, 12:41:21 PM EDT, Tyler Friesen <kf7fy92@...> wrote:


I do the antenna set up parallel to the power lines, but they are over 100 feet away, I don’t know if that would still cause a problem?