The switching frequency is 330kHz for the mini-360.
oz9ny, niels
|
I see that there are converters using this chip are listed on
Amazon.
Do you know if the frequency is easily adjustable on these
boards?
John
On 8/10/2022 7:48 AM, Raj vu2zap wrote:
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Show quoted text
Then I stumbled on this one (see attached pdf) MT3608 that runs
at 1.2MHz and will have
3.6/7.2 blips. Tweak it to 1.15 Mhz and this can be avoided.
Raj
On 10/08/2022 6:47 PM, Ashhar Farhan
wrote:
Neils,
Many of these switching regulators have a 50
KHz switching frequency. This has images inside the passband
of the audio codec.
I arrived at LM338 only after experimenting
with various switching systems (including building one from
discrete components). These new generation of switchers move
the frequency to 500 KHz. That's what makes them useful.
- f
On Wed, Aug 10, 2022, 6:27
PM John Terrell < N6LN@...>
wrote:
The
smallest ones have a small cheap potentiometer which I would
not trust in the long run to maintain a stable output
voltage. Some have a secondary means of choosing between
four or five fixed voltage levels and bypassing the fickle
potentiometer by cutting a pcb trace with a hobby knife.
Loupes help. But in any case a buffer capacitor ought to
reduce a noisy output p.
|
Then I stumbled on this one (see attached pdf) MT3608 that runs
at 1.2MHz and will have
3.6/7.2 blips. Tweak it to 1.15 Mhz and this can be avoided.
Raj
On 10/08/2022 6:47 PM, Ashhar Farhan
wrote:
toggle quoted message
Show quoted text
Neils,
Many of these switching regulators have a 50 KHz
switching frequency. This has images inside the passband of
the audio codec.
I arrived at LM338 only after experimenting with
various switching systems (including building one from
discrete components). These new generation of switchers move
the frequency to 500 KHz. That's what makes them useful.
- f
On Wed, Aug 10, 2022, 6:27 PM
John Terrell < N6LN@...>
wrote:
The smallest
ones have a small cheap potentiometer which I would not trust
in the long run to maintain a stable output voltage. Some have
a secondary means of choosing between four or five fixed
voltage levels and bypassing the fickle potentiometer by
cutting a pcb trace with a hobby knife. Loupes help. But in
any case a buffer capacitor ought to reduce a noisy output p.
|
Neils, Many of these switching regulators have a 50 KHz switching frequency. This has images inside the passband of the audio codec. I arrived at LM338 only after experimenting with various switching systems (including building one from discrete components). These new generation of switchers move the frequency to 500 KHz. That's what makes them useful. - f
On Wed, Aug 10, 2022, 6:27 PM John Terrell < N6LN@...> wrote: The smallest ones have a small cheap potentiometer which I would not trust in the long run to maintain a stable output voltage. Some have a secondary means of choosing between four or five fixed voltage levels and bypassing the fickle potentiometer by cutting a pcb trace with a hobby knife. Loupes help. But in any case a buffer capacitor ought to reduce a noisy output p.
|
The smallest ones have a small cheap potentiometer which I would not trust in the long run to maintain a stable output voltage. Some have a secondary means of choosing between four or five fixed voltage levels and bypassing the fickle potentiometer by cutting a pcb trace with a hobby knife. Loupes help. But in any case a buffer capacitor ought to reduce a noisy output p.
|
The MINI-360 buck converter is way too noisy to be used as an alternative for LM338. Maybe the noise can be reduced by adding a choke and a capacitor. I haven't tried.
Instead I will use a LM2596 DC-DC conveter, Farhan used it one of the sBitx videos and I have successfully used it in my scratch-built sBitx receiver.
oz9ny, niels
|
I use this guy.  Or any cheap USB sound dongle. Jamb the sound card into your pc.? Hook the headphone jack of the sound card to the uBITX mic input.? Hook the mic input of the sound card to the uBITX speaker output. Make 100% sure wsjt-x sees the new sound card under wsjt-x audio. Fiddle with level setting.? Use a sperate usb cable to connect the little usb port on the Arduino to your PC.? Configure in WSJT-X.?? Go into FT8 land and enjoy. Don km4udx
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Re: Ubitx Ver 6 need PTT circuit for Linear AMP
Michael:?
Was wondering what kind of amp you have? Is it commercial, kit or home brew?
Dave ?WD8AJQSent from my iPhoneSE?
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On Aug 9, 2022, at 6:35 PM, Michael <kg5umh@...> wrote:
?Sorry for activating an old thread - every thread regarding this topic seems to lead back to the Ubits Hacks pages.
Still trying to figure out this Amp activation. The amp I intend to use has a simple "short to ground" trigger circuit. I started using this information:?? But I get stopped at connecting the anode of one diode to the orange wire going to the raduino. The v6 board does not have the orange wire. Would the anode of the diode go to pin #2 of the Arduino connector? Pin #2 is the same trace that the ring of the mic jack goes to. Seems that it needs to land somewhere else. I understand the remainder of the circuit, it is the "orange" wire that is causing the confusion.?
--
KG5UMH
Michael - DM93am
|
Re: Ubitx Ver 6 need PTT circuit for Linear AMP
From that circuit, connect the reed relay coils 1 - ground and 2 to TX 12V
Connect NO contacts to ground and your amp control line.
you dont need anything else.
Raj
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Show quoted text
On 10/08/2022 4:05 AM, Michael wrote: Sorry for activating an old thread - every thread regarding this topic seems to lead back to the Ubits Hacks pages.
Still trying to figure out this Amp activation. The amp I intend to use has a simple "short to ground" trigger circuit. I started using this information: But I get stopped at connecting the anode of one diode to the orange wire going to the raduino. The v6 board does not have the orange wire. Would the anode of the diode go to pin #2 of the Arduino connector? Pin #2 is the same trace that the ring of the mic jack goes to. Seems that it needs to land somewhere else. I understand the remainder of the circuit, it is the "orange" wire that is causing the confusion.
--
KG5UMH
Michael - DM93am
|
Re: Nextion Display "File Version is too low"
Hi Tim,
have You tested using the "QR code backup"?? I have the same problem as you "... The remaining memory is not enough to run the temporary use of QR code (-261)..." I succeeded complie but I can't use the QR backup function, getting "Error- data file is short". Do You have the same problem ?
73 de SM0TRY, Ulf
|
Re: Can't reply to CQ in FT8
#sBitx
Good to know, all working as designed.? I would suggest changing the greeting when you get into semi-auto mode to let users know.
On Tue, Aug 9, 2022 at 9:47 PM Ashhar Farhan < farhanbox@...> wrote: You have to pick the cq and then F1=reply. I did this because the text size is so small that I was frequently selecting the wrong callsign. Hence, the double check.
Hi is anyone having troubles replying to CQ in FT8 mode.? As you can see in the attached image, when I select a CQ station to reply to, it does not pickup?the call or mycall.? It just transmits nothing, just a single tone.? It was working before I updated to the new version which included ft8 changes.? I click on the CQ line and then hit enter.? Yes I have set it to ft8mode semi.? BUT it does send properly if I switch to the macro keyboard and press F1 - Call button.? Thoughts?
|
Hi Ashhar,
FYI - I¡¯ve made two more commits within pull request #8. ?These add a 1 MHz step and frequency separators:
73 Goody K3NG
|
Re: Can't reply to CQ in FT8
#sBitx
You seem to be 1/2 second off, have you tried fixing your system clock? That half second, plus your reaction time, may be too long... Ken, N2VIP
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On Aug 9, 2022, at 20:56, Lou KI5FTY <lscalpati@...> wrote:
? Hi is anyone having troubles replying to CQ in FT8 mode.? As you can see in the attached image, when I select a CQ station to reply to, it does not pickup?the call or mycall.? It just transmits nothing, just a single tone.? It was working before I updated to the new version which included ft8 changes.? I click on the CQ line and then hit enter.? Yes I have set it to ft8mode semi.? BUT it does send properly if I switch to the macro keyboard and press F1 - Call button.? Thoughts? 
|
Re: Can't reply to CQ in FT8
#sBitx
You have to pick the cq and then F1=reply. I did this because the text size is so small that I was frequently selecting the wrong callsign. Hence, the double check.
Hi is anyone having troubles replying to CQ in FT8 mode.? As you can see in the attached image, when I select a CQ station to reply to, it does not pickup?the call or mycall.? It just transmits nothing, just a single tone.? It was working before I updated to the new version which included ft8 changes.? I click on the CQ line and then hit enter.? Yes I have set it to ft8mode semi.? BUT it does send properly if I switch to the macro keyboard and press F1 - Call button.? Thoughts?
|
|
|
Can't reply to CQ in FT8
#sBitx
Hi is anyone having troubles replying to CQ in FT8 mode.? As you can see in the attached image, when I select a CQ station to reply to, it does not pickup?the call or mycall.? It just transmits nothing, just a single tone.? It was working before I updated to the new version which included ft8 changes.? I click on the CQ line and then hit enter.? Yes I have set it to ft8mode semi.? BUT it does send properly if I switch to the macro keyboard and press F1 - Call button.? Thoughts?
|
Re: Ubitx Ver 6 need PTT circuit for Linear AMP
Sorry for activating an old thread - every thread regarding this topic seems to lead back to the Ubits Hacks pages.
Still trying to figure out this Amp activation. The amp I intend to use has a simple "short to ground" trigger circuit. I started using this information:?? But I get stopped at connecting the anode of one diode to the orange wire going to the raduino. The v6 board does not have the orange wire. Would the anode of the diode go to pin #2 of the Arduino connector? Pin #2 is the same trace that the ring of the mic jack goes to. Seems that it needs to land somewhere else. I understand the remainder of the circuit, it is the "orange" wire that is causing the confusion.?
--
KG5UMH
Michael - DM93am
|
Remember that there is a PTT connected to the ring of the mic plug. You need to isolate the ring from the audio card.?
73
Evan
AC9TU
|
Plenty of info. alot of us run v6 ubitxs with ft8,directly connected to computer using only audio cables from computer to radio and a cat cable to comuter so you can control the frequency via the computer. Plent of info just tye ft8 setup with ubitx v6 into the search box. also should be some info in the files section, and others here who can give you proper setup info etc.
ac9xh
On Tuesday, August 9, 2022 at 11:04:26 AM EDT, KO4FUD <ctjaques@...> wrote:
Hello group is there some info available, on how to set up the v-6 for ft 8 ? Also has anyone tried to run ft8 on an android device using the v-6?
|
Ashhar,
I attempted the "git pull", but received the message "already updated." I expect this is because I updated the file yesterday when I was setting up the sBITX for the first time.
--
Stephen, KO4CVU
|
Raj vu2zap
John Terrell, N6LN
Barb WB2CBA
