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sbitx.net

Pierre FK8IH
 

How could I register to sbitx.net?
73 Pierre FK8IH
Re: sbitx v3 circuit and performance details

 

Hi Gyula,

I kind of figured that and already ordered me 10 of them, I can install them on both my DE and V2. I really look forward to the V3 software next.

Joel
N6ALT
Re: sbitx v3 circuit and performance details

 

Joel,
I bought CDSOD323-T03C diodes in connection with building another sdr.
The Minimum Breakdown Voltage of this diode is 4.0V.
As Ashhar recommended in message #106236, this is just right for the IRFZ24.
--
Gyula HA3HZ
Re: 12 volt power supply

 

Aaron, I think those cheap switchers were designed primarily to produce RF noise, and secondarily to produce power. For a short while…
Jack, N6LN
Re: Quick question about the RTC

 

We use the DS3231, which is as accurate as possible with quartz crystal. There are 2.6 million seconds in a month. If the clock drift is even 1 pulse per million, we are still going to be off by 2.6 seconds in a month.
The only alternative would be to add gps to keep the clock synced at all times when not connected for extended periods of time.
- f

On Mon, Nov 20, 2023, 7:21 AM WK4DS <georgiaphotog@...> wrote:
So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.?

Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point.

WK4DS
David

Re: sbitx v3 circuit and performance details

 

Pierre,
The new production run will be v3. We expect the boards anytime soon, Diwali is a huge deal in India and our pick and place guy was shutdown for a week!
We will first start with v3 boards alone and then the full radio.
- f

On Mon, Nov 20, 2023, 7:06 AM Pierre FK8IH <jb.gallauziaux@...> wrote:

Do I understand well? I do not yet own a sBitx but I'am very much interested in this development (using currently mainly a Hermes Lite 2 and a QDX Hi-Band).
If I want to use a sBitx I must buy a V2, make myself the modifications () and upgrade to V3 software?
One last question: in a near future will the sBitx sold by HF Signals be directly V3 hardware versions?
Congratulations for your work. I remember having followed the uBitx development and been amazed by the involvment of many Hams, bringing their own mods and improvements but after a lot of hesitations I finally decided I would run SDR and bought a Hermes Lite 2. The sBitx with its revolutionary concepts absolutely deserves my full attention.
73 - Pierre - FK8IH

?
Re: 12 volt power supply

 

What about one like this?
?



--
'72
Aaron?
Quick question about the RTC

 

So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.?

Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point.

WK4DS
David
Re: sbitx v3 circuit and performance details

Pierre FK8IH
 

Do I understand well? I do not yet own a sBitx but I'am very much interested in this development (using currently mainly a Hermes Lite 2 and a QDX Hi-Band).
If I want to use a sBitx I must buy a V2, make myself the modifications () and upgrade to V3 software?
One last question: in a near future will the sBitx sold by HF Signals be directly V3 hardware versions?
Congratulations for your work. I remember having followed the uBitx development and been amazed by the involvment of many Hams, bringing their own mods and improvements but after a lot of hesitations I finally decided I would run SDR and bought a Hermes Lite 2. The sBitx with its revolutionary concepts absolutely deserves my full attention.
73 - Pierre - FK8IH

?
Re: sbitx v3 circuit and performance details

 

Joel,
I would highly recommend it. The maximum gate voltage of the IRFZ24N is half that of the IRF510s and it is more prone to breakdown.
- f


On Sun, Nov 19, 2023, 9:55 PM Joel Caulkins/N6ALT <caulktel@...> wrote:
Farhan,

Would there be any benefit to installing the Transient suppressor diodes if I choose to just keep my PA section using the IRFZ24N FETs?

Joel
N6ALT

Re: strange behaviour of IRF MOSFETs

 

An example of mosfet high power for 2009 by W6JL the "89 cent special"
as an entry into the ARRL homebrew challenge,

Worth a read as an example of a well documented design.

--
Allison
------------------
Please use the forum, offline and private will go to bit bucket.

w6jl_HF_50watt_amplifier.pdf
w6jl_HF_50watt_amplifier.pdf

Re: 12 volt power supply

 

The only thing I would worry about with that power supply is, it is a switch mode supply and they tend to put out a lot of hash on the HF frequencies.?

Joel
N6ALT
12 volt power supply

 

Hi
I have been very happy with my ubitx v6.1 and i am using a yaesu power supply with 25 amps but i was thinking about a small power supply that would be more portable.
I bought the 3 amp version of this power supply for my tivo roamio and it works great and i saw they have this 5 amp supply. It works with a 2.1 mm plug and center is positive.
I wonder if anyone has any thoughts regarding this power supply ?




thanks

David W9PH

power.JPG

Re: sbitx v3 circuit and performance details

 

Joel -- leave a few for me!!
Ashhar has found great solutions.? ? I'm sorry to see the power go down slightly, but I'm guessing the purity got even better.? ?This radio continues to improve!

I hope to box mine up when I get back home in several days.? ? I'll order the TVS diodes and add them later.? ? Make copies of my operating chip and start installing V3 software.

Gordon KX4Z


On Sun, Nov 19, 2023 at 2:50?PM Joel Caulkins/N6ALT <caulktel@...> wrote:
Buy 10 and get them for $0.53 each!

Joel
N6ALT

Re: sbitx v3 circuit and performance details

 

Buy 10 and get them for $0.53 each!

Joel
N6ALT
Re: sbitx v3 circuit and performance details

 

Digikey has 134,000 of those diodes, and they are dirt cheap.? ?$0.64
Re: strange behaviour of IRF MOSFETs

 

Just a question, how hot do the 2219As run?
Also the BFR105, how hot?

--
Allison
------------------
Please use the forum, offline and private will go to bit bucket.
Re: sBitx V2 FT8 Problems

 

Ashhar,
I was thinking of renaming the sbitx library to sbitxv3. I then cloned it from git.
I copied the necessary files and tested what it does.
I just launched gtk ui. I made some connections, which my automatic saved in a Log file.

At the end of the first connection, he deleted the contents of the qso window.
In the next one, what he saved in a log file, he did not delete, because there was no reply to my R-xx message.
Then I tried the LOG>> button and it worked. I started the WEB and qso is listed twice.

According to them, the microSD card (San Disk Ultra 32GB) could be faulty?
Now I keep the sbitxv3 folder. There might be a bad sector. Just guessing.
--
Gyula HA3HZ
Re: sbitx v3 circuit and performance details

 

Farhan,

Would there be any benefit to installing the Transient suppressor diodes if I choose to just keep my PA section using the IRFZ24N FETs?

Joel
N6ALT
Re: sbitx v3 circuit and performance details

 

Great work as usual.? ?Providing the VOLTAGES is a great step for folks experiencing "issues"
Congrats.

I think I will stick with the existing MOSFETS but I'll look into the transient suppressor you suggest.? ?Thanks!
Gordon KX4Z



On Sun, Nov 19, 2023 at 7:55?AM Ashhar Farhan <farhanbox@...> wrote:
I have included rf voltages at various points to make it easier for folks to troubleshoot the PA chain.
- f

On Sun, Nov 19, 2023, 6:20 PM Ashhar Farhan via <farhanbox=gmail.com@groups.io> wrote:
I completed a comprehensive test of sbitx v3 using IRF510s and all the modifications and performance figures are in a document.
To put it in a nutshell, the IRF510 PA provides 25 watts upto 10 MHz, 20 Watts to 21 Mhz, and 10 watts on 28 MHz. The power chain is very resilient and useful even for other projects.
You can read the details on?
The complete circuit diagram?(it is same as v2 except for a few resistors) is on?

- f
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