Date   

Re: Si5351 weirdness

 

I've seen this and its always the capacitor!

Raj

At 15/06/2020, you wrote:
Hans and the group,
This is going to be fun. Today, I was fooling around with the Antuino and suddenly, it wouldn't read the return loss. I checked the driving signal. It was on, but off by about 200 khz. Naturally, the measurement receiver wouldnt pick it up.
I added serial.print into thr source code. Everything seemed to be perfect. Finally on a dare, I probed the crystal, it was at 27.2 mhz! I resoldered, etc. After a few minutes, it jumped back to its standard 27 mhz frequency.
I have never seen anything like this on the si5351. Spurious crystal modes are not uncommon. Anyone else has experienced this too?
- f


Si5351 weirdness

Ashhar Farhan
 

Hans and the group,
This is going to be fun. Today, I was fooling around with the Antuino and suddenly, it wouldn't read the return loss. I checked the driving signal. It was on, but off by about 200 khz. Naturally, the measurement receiver wouldnt pick it up.
I added serial.print into thr source code. Everything seemed to be perfect. Finally on a dare, I probed the crystal, it was at 27.2 mhz! I resoldered, etc. After a few minutes, it jumped back to its standard 27 mhz frequency.
I have never seen anything like this on the si5351. Spurious crystal modes are not uncommon. Anyone else has experienced this too?
- f


Re: Bitx40 Keeps On Tickiing

Jack, W8TEE
 

Mornin' Pete!

I did something similar, but for Diz's 5 Watter using an (almost) waterproof Apache case from Harbor Freight. They go on sale for $10 from time-to-time. I left all of the connectors "inside" the case so if I drop it in a lake, not only will it float long enough to retrieve it, it will be dry when I catch up to it. (Not that I'm clumsy or anything...) Works well!

Inline image

Jack, W8TEE


On Monday, June 15, 2020, 10:03:33 AM EDT, N6QWHAM@... <n6qwham@...> wrote:


Many years ago the ad for the Timex watch touted it just keeps on ticking. The Bitx40 not unlike the Timex watch keeps on Ticking. Recently I was gifted two Bitx40 boards and one inoperative Raduino. I set about fabricating a controller with LCD and in the process added USB capability (by shifting the LO to 19 MHz) so it could be used on FT-8. But now how to "box it". I found a rather neat plastic box that was intended to be a case to carry First Aid Supplies. The case can be purchased from Amazon sans the supplies. The case is durable and has a sealed gasketed lid. For the LCD and Controls I built a sub-panel and painted it my signature Juliano Blue. This enclosure is ideal as it easily contains the Bitx40 plus room for batteries, antenna wire, microphone etc. The bonus --a carrying handle.

Pete N6QW

--
Jack, W8TEE


Re: Bitx40 Keeps On Tickiing

Dale Parfitt
 

As always, nice  work Pete,

Dale W4OP

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of N6QWHAM@...
Sent: Monday, June 15, 2020 9:48 AM
To: BITX20@groups.io
Subject: [BITX20] Bitx40 Keeps On Tickiing

 

Many years ago the ad for the Timex watch touted it just keeps on ticking. The Bitx40 not unlike the Timex watch keeps on Ticking. Recently I was gifted two Bitx40 boards and one inoperative Raduino. I set about fabricating a controller with LCD and in the process added USB capability (by shifting the LO to 19 MHz) so it could be used on FT-8. But now how to "box it". I found a rather neat plastic box that was intended to be a case to carry First Aid Supplies. The case can be purchased from Amazon sans the supplies. The case is durable and has a sealed gasketed lid. For the LCD and Controls I built a sub-panel and painted it my signature Juliano Blue. This enclosure is ideal as it easily contains the Bitx40 plus room for batteries, antenna wire, microphone etc. The bonus --a carrying handle.

Pete N6QW


Bitx40 Keeps On Tickiing

N6QWHAM@...
 

Many years ago the ad for the Timex watch touted it just keeps on ticking. The Bitx40 not unlike the Timex watch keeps on Ticking. Recently I was gifted two Bitx40 boards and one inoperative Raduino. I set about fabricating a controller with LCD and in the process added USB capability (by shifting the LO to 19 MHz) so it could be used on FT-8. But now how to "box it". I found a rather neat plastic box that was intended to be a case to carry First Aid Supplies. The case can be purchased from Amazon sans the supplies. The case is durable and has a sealed gasketed lid. For the LCD and Controls I built a sub-panel and painted it my signature Juliano Blue. This enclosure is ideal as it easily contains the Bitx40 plus room for batteries, antenna wire, microphone etc. The bonus --a carrying handle.

Pete N6QW


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

 

Sumit,

One of your filter relays or associated components in the filter may have failed.

Higher power means higher voltage across capacitors etc.

Raj

At 15/06/2020, you wrote:
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: How to reduce RF power out stepwise with a ubitx V3?

 

You can Jep, just use thin coax like RG174 or similar for in and out lines and put a pot on front panel.
Some here have done it.

Raj

At 15/06/2020, you wrote:
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


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?