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Re: sBitx antenna-first warning
I'd like to clarify : I have recommended a resistive swr bridge, not just three 470 ohms resistors. You will actually need 30 of them. Paralleling ten will produce a combined resistance of 47 ohms. Three such 47 ohm bundles will be used to make a resistive bridge. I will probably build one to show how it must be done. - f On Fri, Aug 5, 2022, 3:58 PM Scott KE8KYP <scott_massey@...> wrote: Hi David, |
sBitx, customs and management fees
Hello,
I just received my sBitx, Basic Kit. It has been accompanied by an additional payment of €53 VAT for the Treasury and €43 for DHL for customs management.
?
So the radio has been a little more expensive than expected but I am sure it will be worth the extra cost and I will enjoy it a lot.
?
Notice for European Union buyers!
?
Ramon EA4GZI |
Re: sBitx antenna-first warning
Hi David,
Thanks for the notes. ?I own and have used a 50 ohm dummy load for years. ?I was referring to Ashhar¡¯s comment that the three parallel 470¡¯s are to be connected to a SWR bridge. ?I too thought he was talking about a dummy load but he was talking about a SWR bridge circuit that uses three resistors. ?Sizing the resistors large enough help protect the PA finals during tuning operations. There is always something to learn. Cheers, Scott |
Re: Ubitx ver 3 ssb transmit question
On receive I am seeing 160 ma minimum.? When I key the mike I can't get 100 ma with any adjustment on the two pots RV2 and RV3. It is 160 ma and above. I am seeing 630 ma on CW key down and 440 ma on SSB. RV1 has some effect but not a great deal. I have not checked RV1 resistance. I am using a charged 12v 7 ah battery for power.
I also did the calibration and BFO adjustment with WWV and the frequency looks good. Transmit audio sounds ok but I only can see 5 watts on the meter in CW. I have tried other microphones including an amplified one. -John |
Re: The sBitx Release on www.vu2ese.com
Steve, The sbitx software requires the presence of si5351 and wm8731 chips. It will crash without them. This is why the program is crashing. Try running it from command line. You will have to cd /home/pi/sbitx and then execute the program ./sbitx On Fri, Aug 5, 2022, 7:16 AM Stephen KO4CVU <goinfishin1952@...> wrote: Will the SBITX software start and run on a Pi 4, 8 GB by itself, in other words ?the Pi isn¡¯t connected to the SBITX boards? My kit has been shipped, but I thought I would familiarize myself with the SBITX software while I wait for it. I successfully burned the image from the website onto a 32 GB MicroSD card and the Pi 4 will boot from it. When I click on the SBITX icon, Fldigi starts in another browser tab and a window flashes briefly in the middle of the screen. I can open the Fldigi tab and close it, but I can¡¯t get the SBITX window to stay open. Thanks. |
Re: The sBitx Release on www.vu2ese.com
Will the SBITX software start and run on a Pi 4, 8 GB by itself, in other words ?the Pi isn¡¯t connected to the SBITX boards? My kit has been shipped, but I thought I would familiarize myself with the SBITX software while I wait for it. I successfully burned the image from the vu2ese.com website onto a 32 GB MicroSD card and the Pi 4 will boot from it. When I click on the SBITX icon, Fldigi starts in another browser tab and a window flashes briefly in the middle of the screen. I can open the Fldigi tab and close it, but I can¡¯t get the SBITX window to stay open. Thanks.
-- Stephen, KO4CVU |
Re: sBitx volume control
Scott, I had posted in the linuxhams group that has members who develop the hamlib. The question was "what is the minimal set of commands that a net rigctl should implement?" So far I havent got any reply.? We should have a way where we kill the fldigi when we choose the digital mode. These are tradeoffs, the fldigi takes time to wake up. So if it is not prelaunched, quickly flipping between modes will be difficult. On the other hand, fldigi automatically takes over and hangs onto the audio devices, preventing other apps to take over the same. If there are any pulseaudio gurus here, we can perhaps do a better job with easier virtual devices. - f On Fri, Aug 5, 2022, 4:50 AM Scott KE8KYP <scott_massey@...> wrote: Hi Ashhar, |
Re: sBitx volume control
Hi Ashhar,
I think I figured most of it out.? Only one external application can access audio at a time.? I did not notice that fldigi automatically launched when sBitx is launched.? I closed fldigi and launched wjstx and partial success.? CAT control is still funky, when it works it seems to only allow sbitx to external app control and not the other way round.? That worries me a bit for automated transmissions, etc., but I have a much better understanding of how audio is used in the RPI.? I'm going to download the RPI version of JS8Call and try to set it up like wjstx and fldigi.? We'll see. So far I am really pleased.? Looking forward to updates and bug fixes as they become available.? I imagine you will have one for things like the audio "tap" and others in the near future. Cheers, Scott? |
Re: Turn off WiFi on your sBitx
OK. I was a little too fast. I did the test without the top cover. When the top cover is in place the sound is there but the frequency is lower than before.
When the WiFi signal is low the the WiFi -transmitter raises the signal power. Tomorrow I will build another LM380 amplifier and try placing it away from the WiFi section. /niels |
Re: sBitx antenna-first warning
¿ªÔÆÌåÓýSemiconductor devices die from either too much power leading to thermal damage, or higher voltage leading to voltage damage, or too much current leading to some other damage.?It¡¯s not magical why they get destroyed. ?It¡¯s easy to explain why Q90 could be destroyed in earlier designs; too much reverse voltage.? The impedance presented to the semiconductor devices by the combinations of passive devices between them and relatively free space (TraTransformers, inductors, capacitors, multiple multiple multiple) ?should remain relatively constant at any power level. ? The passive devices don¡¯t really care what power level (within their limits), they simply run around the Smith chart Depending on what impedance they present to the RF power being potentially delivered by the semiconductors through drain voltage and current changes, some set of instantaneous voltages and currents (at radio frequency) will be developed. ? ?? At low power, the variations in the voltage and current Of the semiconductors ?is very much likely less. ?Hence, less ?chance of exceeding one of their ratings.? I don¡¯t think the semiconductor die can tell what the SWR is¡ª only what voltage drops in current flows are happening. ?And from knowing where you are on the Smith chart those should be predictable. ?? I hope that makes some sense.? Gordon.? On Aug 4, 2022, at 08:49, Jack, W8TEE via groups.io <jjpurdum@...> wrote:
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Re: sBitx volume control
I though the wsjtx was already configured to work with hamlib. The ft8 on the sbitx doesnt use the wsjtx. To use that, you have to set the mode to Digital (not ft8) and then use wsjtx through NET rigctrl of hamlib. Let me try it out here. - f On Thu, Aug 4, 2022, 6:51 PM Scott KE8KYP <scott_massey@...> wrote: Hi Ashhar, |
Re: sBitx PA Power Supply
The irfz24N cant run at a higher voltage. Nor is the PA power line isolated from the 12v supply line (unlike the ubitx) On Thu, Aug 4, 2022, 6:46 PM Max via <kg4pid=[email protected]> wrote:
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Re: Turn off WiFi on your sBitx
I tried that as well, it didn't fix it. On Thu, Aug 4, 2022, 3:12 PM Niels Jalling <niels@...> wrote: Hi |
Re: sBitx volume control
Hi Ashhar,
Just got my sBitx.? Awesome!? You deserve many "pats on the back" and profits.? Thank you for making such a nice product. A few notes:
Maybe I am doing this all wrong so I will reread the Operating instructions but I am assuming that the external programs can work with sBitx and suppling WJST-X will work the radio but I must be missing something. Again, thanks for a great design! Cheers, Scott ? |
Re: sBitx antenna-first warning
Jack, W8TEE
25V Jack, W8TEE
On Wednesday, August 3, 2022 at 01:45:51 PM EDT, Ashhar Farhan <farhanbox@...> wrote:
Jack, How much voltage were you running on the drains? - f On Wed, Aug 3, 2022, 11:00 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
--
Jack, W8TEE |
Re: The Daylight Again - An All analog radio
I bought them off amazon! On Thu, Aug 4, 2022, 5:36 PM Tech Guy <tech48055@...> wrote: I like this. This reminds me of waiting for the next article by W7ZOI or Doug DeMaw. I built a SW converter using a universal breadboard once. It was just a pcb with squares. I need some to pickup some pads for another Manhattan type build.? |
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