Re: Daylight again radio audio filter
Raj, the MDS at 7MHZ is 10uv. A 50uv signal is as loud as the mixer noise. Barry ? Sent from for Windows ?
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From: Raj vu2zapSent: Sunday, September 4, 2022 12:51 AM To: [email protected]Subject: Re: [BITX20] Daylight again radio audio filter ? The original on LTSpice turned up with a 10KHz roll off which is too high. So changed values with suggestions from Farhan till it looked right at 3-4KHz. This should reduce high freq whines and hiss. Raj On 03/09/2022 7:03 PM, barry halterman wrote: Raj, Thanks for the information on the sullen-key filter. I never heard of this design before and found that it has been around for quite some time. Just goes to show the amount of intellect in this group. 73 Barry ? Sent from for Windows ? ? ? For better results change the following values and try: ? R27, 28, 31, 32, 35 & 36 to 2.2K ? C32, 33 & 37 to 0.047u or 0.05u ? C51,53 & 55 to 0.01 ? The filter is Sallen key low pass and after mod will have ? roll off just below 5KHz ? ? Raj ? ? ? ? ? ?
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Thanks, fellows. ?I'm probably going to set aside the Nextion for now as I'm very happy with the N8ME sketch for CW. ?Maybe later this fall or winter I'll try the Nextion again.
73 Howard K4LXY
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Hi Howard,
Sorry for the delayed reply, hopefully others have already solved your problem.
I am using Arduino IDE version 1.8.5. I have not tried more recent versions. Under the IDE ¡°Tools¡± tab I have the following settings.
Board: ¡°Arduino Nano¡±
Processor: ¡°ATmega328P¡±
On the Nextion Display, perhaps try reformatting the SD card and then copy the .tft file as required. When I originally programmed the discovery display, I used the Nextion Editor Ver.1.63.3 via a USB serial adapter connected to the display. I did also check that the .tft method using an SD card which also worked fine.
73, Dave
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Re: Daylight again mixer noise
Barry,
I do not see one thing at all that is "shoddy" on your boards. I can even make sense of it while looking at what is going where after a bit. (Try that on any multilayered trace board made professionally) now those are a true nightmare to figure out.
Alan w7aln
On Sat, Sep 3, 2022, 7:15 AM barry halterman < kthreebo@...> wrote: The joke for today folks! Here is a picture of my pile of parts.? I am somewhat embarrassed to show my shoddy workmanship.The BFO is to the left, off the main board. In this picture the crystal filter output is not connected to the mixer (I was troubleshooting).
On Sat, Sep 3, 2022, 12:46 AM Ashhar Farhan < farhanbox@...> wrote: It could be oscillations as well. Can you post a picture of your build?
On Sat, Sep 3, 2022, 9:41 AM barry halterman < kthreebo@...> wrote: Josh, with the input to the mixer disconnected and the BFO quenched, there is no noise. Ashhar pointed out that what I am hearing is phase noise from the BFO. If I am experiencing phase noise, that phase noise is above all but the strongest received signal. ? Barry ? ? Sent from for Windows ? ? Hello I would like to start building this rig . But don't have a 3d printer . Is there anyone that is making the pto form and cores ? I would like to get a few sets thanks . ? On Fri, Sep 2, 2022 at 4:02 PM, Joshua Blanton The basic design of the mixer should be very quiet - many low-noise VHF receivers use similar constructs in their front-ends.? Are you certain that your noise isn't coming in from somewhere else (a noisy power supply rail, bad bypass caps/poor power bypassing, or a bad part)?? If you don't have *any* input into the mixer (no BFO and no IF) it should be quite silent - but you might need to terminate both inputs with caps to ground.? It seems possible that this circuit could oscillate, depending upon the layout - is that a possibility that you've considered?? I have read many warnings about J310 oscillations at VHF, which can be hard to find with slower oscilloscopes.? Long leads are not your friend with this particular piece of the circuit. I haven't built this mixer yet, so I'm speaking theoretically - but it looks like a textbook cascode mixer circuit. ? On Fri, Sep 2, 2022 at 10:38 AM barry halterman <kthreebo@...> wrote: I am curious as to how much mixer noise I should be hearing from the second mixer. Should the noise (hiss) be stronger than normal band noise? I might be looking into something that is not fixable and the nature of the beast.
--
Chris Mannon
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Re: #sBitx Logitech k400+ keyboard is noisy
#sBitx
I've used these active USB 2.0 extension cables with clip on ferrites attached to each end before to mitigate RFI between my PC and a RTL-SDR dongle.
I wonder if this may be a way to cut down on the noise from the dongle from the Keyboard?
I should have my sBitx Tuesday so I can't test this idea until then.
Zach - AB0E
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Re: Daylight again radio audio filter
The original on LTSpice turned up with a 10KHz roll off which is
too high. So
changed values with suggestions from Farhan till it looked right
at 3-4KHz.
This should reduce high freq whines and hiss.
Raj
On 03/09/2022 7:03 PM, barry halterman
wrote:
toggle quoted message
Show quoted text
Raj, Thanks for the information on the
sullen-key filter. I never heard of this design before and
found that it has been around for quite some time. Just goes
to show the amount of intellect in this group.
73
Barry
?
Sent from for Windows
?
?
?
For better results change the following
values and try:
?
R27, 28, 31, 32, 35 & 36 to 2.2K
?
C32, 33 & 37 to 0.047u or 0.05u
?
C51,53 & 55 to 0.01
?
The filter is Sallen key low pass and after
mod will have
?
roll off just below 5KHz
?
?
Raj
?
?
?
?
?
?
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Steve, If I was 10% as brilliant as Dave (W1HKJ) who wrote the fldigi, I would have gotten the psk31 decoder right on my own. Dave and his band of merrymen and a league in themselves! - f
Farhan - Hi Hi - and I've been telling my friend how brilliant you are to have used FLDIGI to decode CW, and RTTY. FLDIGI has a bunch of other digital modes that make the sbitx more capable and flexible than any other radio made.
73; Steve, N3SB
On Sat, Sep 3, 2022 at 9:47 PM Ashhar Farhan < farhanbox@...> wrote: The CW is a strange implementatoon. CW sending is done internally by sbitx but it passes the audio to fldigi for decoding. In the future, I would like to move all the modems directly into sbitx and let go of fldigi.
FLDIGI CW decoding seems to work best when the red 'pitch" line is just a little bit to the left of the peak in the spectrum display. Look at the scope display in FLDIGI and you can see when it's detecting the right pitch (or not.)
I have also had good luck with opening up the CW decoder bandwidth in FLDIGI - which can be done by getting into the configuration menu?? Configure -> Sound card (just to get into the menu) then swlwcting Modems, CW, and General tabs. There's a slider to control the filter bandwidth. Something near 150 Hz works well for me. While there, have a look at the transmit (speed) slider. Receive speed can vary a good amount from the transmit speed, but it has limits. I've gotten 100% copy on the W1AW CW practice at 35 WPM, but only by nudging up the transmit speed slider a bit.
The CW decoder does require a reasonably good fist. It's not going to do well decoding poor sending.
73; Steve, N3SB
On Sat, Sep 3, 2022 at 7:51 PM Ashhar Farhan < farhanbox@...> wrote: The red line on the spectrum display is controlled with the pitch control. That marks the cw/rtty/psk31 decoder's central frequency. On Sun, Sep 4, 2022, 3:06 AM Steve Beckman < n3sb@...> wrote: Pete - exiting the sbitx application and stopping fldigi, then restarting sbitx will often make the ?? question marks go away.
While sbitx is running, use Alt-Tab to switch over to fldigi to see if the CW signal is centered on fldigi's receive passband.?
73, Steve. N3SB?
-------- Original message -------- Date: 9/3/22 5:24 PM (GMT-05:00) Subject: Re: [BITX20] More Updates #sBitx #sbitx-k3ng
On second thought, I'm not sure I am correct as it seems hard to make it decode under either code with much reliability. So please disregard until you have nothing better to work on. ;-) My internal decoder has been good enough for lots of years and should continue for a while longer. Pete WK8S
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Farhan - Hi Hi - and I've been telling my friend how brilliant you are to have used FLDIGI to decode CW, and RTTY. FLDIGI has a bunch of other digital modes that make the sbitx more capable and flexible than any other radio made.
73; Steve, N3SB
On Sat, Sep 3, 2022 at 9:47 PM Ashhar Farhan < farhanbox@...> wrote: The CW is a strange implementatoon. CW sending is done internally by sbitx but it passes the audio to fldigi for decoding. In the future, I would like to move all the modems directly into sbitx and let go of fldigi.
FLDIGI CW decoding seems to work best when the red 'pitch" line is just a little bit to the left of the peak in the spectrum display. Look at the scope display in FLDIGI and you can see when it's detecting the right pitch (or not.)
I have also had good luck with opening up the CW decoder bandwidth in FLDIGI - which can be done by getting into the configuration menu?? Configure -> Sound card (just to get into the menu) then swlwcting Modems, CW, and General tabs. There's a slider to control the filter bandwidth. Something near 150 Hz works well for me. While there, have a look at the transmit (speed) slider. Receive speed can vary a good amount from the transmit speed, but it has limits. I've gotten 100% copy on the W1AW CW practice at 35 WPM, but only by nudging up the transmit speed slider a bit.
The CW decoder does require a reasonably good fist. It's not going to do well decoding poor sending.
73; Steve, N3SB
On Sat, Sep 3, 2022 at 7:51 PM Ashhar Farhan < farhanbox@...> wrote: The red line on the spectrum display is controlled with the pitch control. That marks the cw/rtty/psk31 decoder's central frequency. On Sun, Sep 4, 2022, 3:06 AM Steve Beckman < n3sb@...> wrote: Pete - exiting the sbitx application and stopping fldigi, then restarting sbitx will often make the ?? question marks go away.
While sbitx is running, use Alt-Tab to switch over to fldigi to see if the CW signal is centered on fldigi's receive passband.?
73, Steve. N3SB?
-------- Original message -------- Date: 9/3/22 5:24 PM (GMT-05:00) Subject: Re: [BITX20] More Updates #sBitx #sbitx-k3ng
On second thought, I'm not sure I am correct as it seems hard to make it decode under either code with much reliability. So please disregard until you have nothing better to work on. ;-) My internal decoder has been good enough for lots of years and should continue for a while longer. Pete WK8S
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The CW is a strange implementatoon. CW sending is done internally by sbitx but it passes the audio to fldigi for decoding. In the future, I would like to move all the modems directly into sbitx and let go of fldigi.
FLDIGI CW decoding seems to work best when the red 'pitch" line is just a little bit to the left of the peak in the spectrum display. Look at the scope display in FLDIGI and you can see when it's detecting the right pitch (or not.)
I have also had good luck with opening up the CW decoder bandwidth in FLDIGI - which can be done by getting into the configuration menu?? Configure -> Sound card (just to get into the menu) then swlwcting Modems, CW, and General tabs. There's a slider to control the filter bandwidth. Something near 150 Hz works well for me. While there, have a look at the transmit (speed) slider. Receive speed can vary a good amount from the transmit speed, but it has limits. I've gotten 100% copy on the W1AW CW practice at 35 WPM, but only by nudging up the transmit speed slider a bit.
The CW decoder does require a reasonably good fist. It's not going to do well decoding poor sending.
73; Steve, N3SB
On Sat, Sep 3, 2022 at 7:51 PM Ashhar Farhan < farhanbox@...> wrote: The red line on the spectrum display is controlled with the pitch control. That marks the cw/rtty/psk31 decoder's central frequency. On Sun, Sep 4, 2022, 3:06 AM Steve Beckman < n3sb@...> wrote: Pete - exiting the sbitx application and stopping fldigi, then restarting sbitx will often make the ?? question marks go away.
While sbitx is running, use Alt-Tab to switch over to fldigi to see if the CW signal is centered on fldigi's receive passband.?
73, Steve. N3SB?
-------- Original message -------- Date: 9/3/22 5:24 PM (GMT-05:00) Subject: Re: [BITX20] More Updates #sBitx #sbitx-k3ng
On second thought, I'm not sure I am correct as it seems hard to make it decode under either code with much reliability. So please disregard until you have nothing better to work on. ;-) My internal decoder has been good enough for lots of years and should continue for a while longer. Pete WK8S
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Re: no icon on sbitx on touch screen...help....
Reminder that if the sbitx is not properly shut down, the sd card can get corrupted, Shut down the Pi using the Logout option in the menu, then selecting shutdown. Wait 20 - 30 seconds after the display turns off, then you can flip the power switch.
73; Steve, N3SB
On Sat, Sep 3, 2022 at 8:39 PM Ashhar Farhan < farhanbox@...> wrote: The desktop icon is created by copying a file with .desktop extension in the folder/home/pi/Desktop. That file is already in the /home/pi/sbitx folder.? 1. Press ctrl-alt-T to open the terminal. 2. Type : cp /home/pi/sbitx/sBitx.desktop /home/pi/Desktop Press enter 3. Reboot
hello,?? from? in3izq?? danilo...?? have a? little? problem with my? sbitx . during? first test, i? don't know? how is happen ,?? have lost? icon of sbitx and? fldigi? on? touch screen . when?? sbitx? on , i have?? only icon? of raspberry ,? and other? 2 on screen.? Need reload all software of? sbitx? on sd ? when i? start? sbitx? i have? only
icon? of raspy,?? not? screen with? schematic of radio and other.? sorry? for my? english. i hope? in? your message.? tnx in advance? and? best regard ? danilo in3izq?
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FLDIGI CW decoding seems to work best when the red 'pitch" line is just a little bit to the left of the peak in the spectrum display. Look at the scope display in FLDIGI and you can see when it's detecting the right pitch (or not.)
I have also had good luck with opening up the CW decoder bandwidth in FLDIGI - which can be done by getting into the configuration menu?? Configure -> Sound card (just to get into the menu) then swlwcting Modems, CW, and General tabs. There's a slider to control the filter bandwidth. Something near 150 Hz works well for me. While there, have a look at the transmit (speed) slider. Receive speed can vary a good amount from the transmit speed, but it has limits. I've gotten 100% copy on the W1AW CW practice at 35 WPM, but only by nudging up the transmit speed slider a bit.
The CW decoder does require a reasonably good fist. It's not going to do well decoding poor sending.
73; Steve, N3SB
On Sat, Sep 3, 2022 at 7:51 PM Ashhar Farhan < farhanbox@...> wrote: The red line on the spectrum display is controlled with the pitch control. That marks the cw/rtty/psk31 decoder's central frequency. On Sun, Sep 4, 2022, 3:06 AM Steve Beckman < n3sb@...> wrote: Pete - exiting the sbitx application and stopping fldigi, then restarting sbitx will often make the ?? question marks go away.
While sbitx is running, use Alt-Tab to switch over to fldigi to see if the CW signal is centered on fldigi's receive passband.?
73, Steve. N3SB?
-------- Original message -------- Date: 9/3/22 5:24 PM (GMT-05:00) Subject: Re: [BITX20] More Updates #sBitx #sbitx-k3ng
On second thought, I'm not sure I am correct as it seems hard to make it decode under either code with much reliability. So please disregard until you have nothing better to work on. ;-) My internal decoder has been good enough for lots of years and should continue for a while longer. Pete WK8S
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Re: no icon on sbitx on touch screen...help....
The desktop icon is created by copying a file with .desktop extension in the folder/home/pi/Desktop. That file is already in the /home/pi/sbitx folder.? 1. Press ctrl-alt-T to open the terminal. 2. Type : cp /home/pi/sbitx/sBitx.desktop /home/pi/Desktop Press enter 3. Reboot
hello,?? from? in3izq?? danilo...?? have a? little? problem with my? sbitx . during? first test, i? don't know? how is happen ,?? have lost? icon of sbitx and? fldigi? on? touch screen . when?? sbitx? on , i have?? only icon? of raspberry ,? and other? 2 on screen.? Need reload all software of? sbitx? on sd ? when i? start? sbitx? i have? only
icon? of raspy,?? not? screen with? schematic of radio and other.? sorry? for my? english. i hope? in? your message.? tnx in advance? and? best regard ? danilo in3izq?
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Re: Ubitx version 3 heatsink
Please let us know how that works out. I've wanted to do the same thing to mine.
Max
On Saturday, September 3, 2022, 07:23:03 PM CDT, Tech Guy <tech48055@...> wrote:
Can both IRF 510s be mounted to one heatsink if mica insulators are used? I¡¯m thinking about doing a separate 24v supply to the finals.
John N4HNO?
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Re: Ubitx version 3 heatsink
Wasn't there some sort of problem doing that? Capacitance between the heat sink and the IFR510 maybe? I vaguely remember some sort of issue doing that.
Max
On Saturday, September 3, 2022, 07:23:03 PM CDT, Tech Guy <tech48055@...> wrote:
Can both IRF 510s be mounted to one heatsink if mica insulators are used? I¡¯m thinking about doing a separate 24v supply to the finals.
John N4HNO?
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Can both IRF 510s be mounted to one heatsink if mica insulators are used? I¡¯m thinking about doing a separate 24v supply to the finals.
John N4HNO?
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The red line on the spectrum display is controlled with the pitch control. That marks the cw/rtty/psk31 decoder's central frequency.
On Sun, Sep 4, 2022, 3:06 AM Steve Beckman < n3sb@...> wrote: Pete - exiting the sbitx application and stopping fldigi, then restarting sbitx will often make the ?? question marks go away.
While sbitx is running, use Alt-Tab to switch over to fldigi to see if the CW signal is centered on fldigi's receive passband.?
73, Steve. N3SB?
-------- Original message -------- Date: 9/3/22 5:24 PM (GMT-05:00) Subject: Re: [BITX20] More Updates #sBitx #sbitx-k3ng
On second thought, I'm not sure I am correct as it seems hard to make it decode under either code with much reliability. So please disregard until you have nothing better to work on. ;-) My internal decoder has been good enough for lots of years and should continue for a while longer. Pete WK8S
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Re: Daylight Radio PTO -- 3D printed inductor forms
Dear Ashhar,
I was able to scale the part to 110% of the stl file you send me and the nuts fit perfectly.? CURA will allow you to scale the part before you slice it.?? So, it took a couple of tries and I ended up with scalling X,Y, and Z by 110% and then sliced it and my part was able to
fit the nuts really well.?? Yes some of the nuts seem to be a slightly different size but by adjusting the size, you should be able to come up with a good match.
Take care and have fun.?? I am getting close to wiring up my receiver.?
73 Dave WA5DJJ
SUPER QRSS/WSPR GRABBER https://www.qsl.net/wa5djj/
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Re: Daylight Radio PTO -- 3D printed inductor forms
Dear Dean,
On the other? PTO stl files I had to increase the part by 10% on all dimensions.??? Now the nuts fit perfectly.?? In CURA you can arbitrarily increase or decrease a parts size by a percentage before you slice it.?? Then slice it and print it.? then judge from there if you need to increase it or decrease it? until the brass nuts fit.?? That may also change the size of the turns used but you can adjust that after you get the PTO oscillator built by taking turns of the 30 turn end of the coil.?? (on my other one it was about 4 or 5 turns.?
I didn't need to raise my mechanism up so I did not use the part your printing.
Take care and have fun.?? Good luck.
73 Dave WA5DJJ
SUPER QRSS/WSPR GRABBER
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Pete - exiting the sbitx application and stopping fldigi, then restarting sbitx will often make the ?? question marks go away.
While sbitx is running, use Alt-Tab to switch over to fldigi to see if the CW signal is centered on fldigi's receive passband.?
73, Steve. N3SB?
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-------- Original message -------- From: "PeteWK8S via groups.io" <pmeier@...> Date: 9/3/22 5:24 PM (GMT-05:00) Subject: Re: [BITX20] More Updates #sBitx #sbitx-k3ng
On second thought, I'm not sure I am correct as it seems hard to make it decode under either code with much reliability. So please disregard until you have nothing better to work on. ;-) My internal decoder has been good enough for lots of years and should continue for a while longer. Pete WK8S
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Gerard
Zach Davis - AB0E
Raj vu2zap