I also use the fet method, not as simple as a diode, but voltage drop way lesd
I use Powerpoles for battery and PSU connections.? I also use KC9ON's FET-based devices in place of diodes.? They're good for up to 50 V and 7 A.
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There are also 'ideal diode' boards that are inexpensive.? I've not used them, yet a guy with a Swiss distortion in the signal seems to like them.?
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73, Andy
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I use Powerpoles for battery and PSU connections.? I also use KC9ON's FET-based devices in place of diodes.? They're good for up to 50 V and 7 A.
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There are also 'ideal diode' boards that are inexpensive.? I've not used them, yet a guy with a Swiss distortion in the signal seems to like them.?
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73, Andy
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Re: Sbitx and ad831 mixer
Farhan,?
Later I would like learn more about harmonic mixing.
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What I think I would do is to setup the bandpass filters for 10m, 6m, 4m and 2m. If fm is added later, it will be fun to operate on those bands.
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But before all that happens have to box everything and think about power management. There is some artifacts in the audio related to that.?
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Thanks a lot for this amazing software that gives us the oportunity to tinker and do homebrewing easier because half of the radio is done.?
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Thanks again,?
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Juan WP3DN
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Re: Sbitx and ad831 mixer
Peter,?
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This the normal sbitx software with audio injector card and si5351. Have two ad831 mixers and a 10.7mhz 30khz crystal filter.
To rx clock 2 goes to first mixer and bfo goes to 2nd mixer. Sound output from the mixer goes to the sound input to sbitx software.
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To tx clock 1 bfo goes to 1st mixer and clock 2 to 2nd mixer. Audio output from sbitx sound card goes to 1st mixer, same input from antenna in rx. The antenna is switch to the output of the 2nd mixer.
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To do the clock swap and antenna switching im using two small relays.
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Juan WP3DN
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Re: Sbitx and ad831 mixer
This is a nice setup, can you explain it in a bit more detail, what frequencies are you running on each mixer, I assume the second one is a fixed frequency, and are you pushing the output into something like a zbitx to generate the waterfall ?
Farhan,?
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This is a video of a ssb tx test and how it looks on sbitx v1 spectrum.?
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For mic bias I used 10k resistor to 5v and 4.7uf capacitor. No mic amp.
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Juan, WP3DN
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Re: Sbitx and ad831 mixer
Farhan,?
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This is a video of a ssb tx test and how it looks on sbitx v1 spectrum.?
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For mic bias I used 10k resistor to 5v and 4.7uf capacitor. No mic amp.
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Juan, WP3DN
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Re: Sbitx and ad831 mixer
With the AD831 mixer, you should be able to use 3rd harmonic mixing and go upto 435 Mhz
Farhan,?
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No band pass filter in place yet. Just wanted to see if it was generating rf.? Need to decide which bands to include since the need to filter per band.
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Juan WP3DN
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Re: Sbitx and ad831 mixer
Farhan,?
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No band pass filter in place yet. Just wanted to see if it was generating rf.? Need to decide which bands to include since the need to filter per band.
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Juan WP3DN
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Data recovery from a dead MicroSD card
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Only 16 minutes ;-)
--
Gyula HA3HZ
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Re: Renewed attempt to hack together a workable PA
You did read VK7MX's post? Attached.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ
Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois
Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.
email: bill@...
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Ravi Miranda Sent: Friday, September 13, 2024 10:32 AM To: [email protected]Subject: Re: [BITX20] Renewed attempt to hack together a workable PA William, I'm not sure what you are talking about here. I'm mentioning about the 20Watt amp that I have and uBITx board I built and I am/was looking for advice on the predriver stages. This is not a kit and is my bespoke build. Maybe you are on the wrong thread? Have a lovely day and good weekend. Best 73, Ravi/M0RVI On Fri, 13 Sept 2024 at 13:53, K9HZ via groups.io <bill@...> wrote:
The learning for me was that I should never announce a product/ kit before I have them in hand and sell out what I have, re-stock and repeat. No more lists. I used the list to gauge part purchases in advance to negotiate the absolute best prices for the kits. The kits, as always, were sold at my cost so the savings by planning went to the buyers.
You know what they say. Learn. Never again.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ VP2EHZ
Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois
Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.
email: bill@...
From: [email protected] <[email protected]> On Behalf Of Bill Maxwell
via groups.io
Sent: Thursday, September 12, 2024 6:04 PM
To: [email protected]
Subject: Re: [BITX20] Renewed attempt to hack together a workable PA
I suspect the nub of Andy's problem was the list of potential buyers that was run for many months before you understandably decided it was too much effort for too little gain to chase up the people on the list once you had stock available and opened purchase to all comers. I think quite a few on the list thought the list was still active and that you would get to them in time, so didn't respond to your "all comers" invitation, hence didn't actually lodge orders with you. I know I nearly fell into that category.
Bill, VK7MX
-- I'm here to add more value to the world than I'm using up.
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Re: Sbitx and ad831 mixer
https://youtu.be/Rn_7CbXwqt0?si=HTt1cNa-2umdUhMc
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Re: Sbitx and ad831 mixer
Tx works!!!!
Did a little board to swap the clocks and another board to switch rx/transmit audio and tx/receive audio. Very low power but enough to listen on a handheld radio!!!
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Juan WP3DN
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Re: Renewed attempt to hack together a workable PA
As often happens on the group, we seem to have several threads running simultaneously. I believe Bill was responding to my post about the prospective board and semi-kit buyer list that was in operation in 2023 and earlier this year. I agree with you fully Bill, no more lists.
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Bill ( another one) VK7MX
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Too bad. It would be an instant success.
I can only think HF Signals cannot afford the little investment required (which is not so comforting...)
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Re: Upgrade to "sBitx 64 bit v3.1 - BTS"
On Fri, Sep 13, 2024 at 04:49 AM, Shawn Rutledge K7IHZ wrote:
Why don’t you set up a repo for some custom Debian packages so that apt-get upgrade is enough? ?Reimaging and starting over has been unnecessary for a long time now on most Linux distros.
Hi Shawn - the 64 bit distribution is all volunteer / user contributed.? You sound like you know what you are doing - I'm sure you will be more than wellcome to jump in and contribute.
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And Farhan is continuing to develop the 32 bit baseline and will move to 64 bit as well.? As you say - that's the great thing about open-source - you can have it your way!
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I believe Farhan has also included this in the farhandev branch of the 32bit project.
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The code base is the same. Checkout the.farhandev branch of sbitx repository
On Fri, Sep 13, 2024, 10:22 PM Charudatt Uplap via <charudattu= [email protected]> wrote: Hi Farhan?
Please share at least the code used in the prototype you demonstrated at FDIM this?year.
The OLED support looks promising and suitable to.?
You said you'd be sharing the code during one of your submission, still waiting for it.
Happy to share, Nick Kennedy surely succeeded in realising your idea on zBITX and I'm happy about?it.
He's also stuck at getting the OLED display to work.
Could you please be kind enough to show us the way to get it to work.
Charudatt - VU2UPX?
On Fri, 13 Sept, 2024, 9:23 pm Ashhar Farhan via , <farhanbox= [email protected]> wrote: The zbitx is just a scratch built sbitx. There are no plans from HF signals to offer a kit.
I hope someone else picks up the slack
On Fri, Sep 13, 2024, 5:25 PM vincenzo.praturlon via <vincenzo.praturlon= [email protected]> wrote: Hi, thank you for the add.
Any chance of a production batch of the zBitx kit / assembled unit?
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Hi Farhan?
Please share at least the code used in the prototype you demonstrated at FDIM this?year.
The OLED support looks promising and suitable to.?
You said you'd be sharing the code during one of your submission, still waiting for it.
Happy to share, Nick Kennedy surely succeeded in realising your idea on zBITX and I'm happy about?it.
He's also stuck at getting the OLED display to work.
Could you please be kind enough to show us the way to get it to work.
Charudatt - VU2UPX?
On Fri, 13 Sept, 2024, 9:23 pm Ashhar Farhan via , <farhanbox= [email protected]> wrote: The zbitx is just a scratch built sbitx. There are no plans from HF signals to offer a kit.
I hope someone else picks up the slack
On Fri, Sep 13, 2024, 5:25 PM vincenzo.praturlon via <vincenzo.praturlon= [email protected]> wrote: Hi, thank you for the add.
Any chance of a production batch of the zBitx kit / assembled unit?
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I soldered in a 20 amp diode(20A10) as a reverse shunt; it's what I had laying around.? Note that the markings on the sBitx circuit board where the power comes in are reversed.? That plus sign on the board should be a negative.? I know the solder job looks bad but I did put a lot of heat to it.? I just couldn't get it shiny.? What is good about this diode is it can trip the circuit breaker on my 20 amp Astron before I even turn the sBitx power on.? I still went ahead and added a 10 amp blade fuse to the external power pigtail for extra protection.
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Tominaz
HA3HZ
K9HZ
AE9J