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Fred:
I, too, am playing around with a TFT display and have posted a picture of it. (It's changed a bit since then.) It's for a 2.4" mcufriend.com display and I've just changed the code so it auto-sizes for displays between 2.4"-3.95". The bad news is that the Nano does not have the stack/heap space needed for the code+library, so I am using a Mega 2560 Pro Mini. It has a footprint that is about half the size of a regular Mega. If you'd like to see the software, contact me off list using the QRZ dot com email.
Jack, W8TEE
From: Dr Fred Hambrecht <AAR4MI@...>
To: [email protected]
Sent: Thursday, February 9, 2017 10:50 AM
Subject: Re: [BITX20] SDR kits VFO
You can download a copy from . It is well commented to aid in understanding the program. The software to compile it and upload to the VFO is available is free as well. Like you I just started with mine a few weeks ago and in addition to the BITX40 I bought a kit off of Amazon that comes with a number of sensors and programming examples that will be a learning experience in itself. ?The description is not in agreement with the programming and you will have to make pen and ink corrections to the sketch description. Randy, K7AGE has posted a pinout diagram that is correct and is in the groups history. ? In addition to fooling around with the BITX I am playing with designing a digital artificial horizon using a 2.8¡± TFT display for use on an experimental aircraft. ? The programming takes me back to my NASA days when we were trying to land on the moon with a computer with less power than the Arduino. ?Unlike today, we had to shoehorn everything into 4K. While the stack is limited even with all my changes I still have 40% left. ?I promise your head will swim with all the projects you realize you can do with the Arduino. ? V/R Fred W4JLE ? ? ? ? Hi Fred, I would very much like the Sketch ?for the BITX-40 ... I would then try having a play around with it, Although my programming is very rusty for sure ... Marc 'Gw0wvl' .. ? On Thu, 9 Feb 2017 at 1:06, Dr Fred Hambrecht The formula for upper and lower sideband is explained in the sketch. Simply uncommenting a few lines and adding the Fbutton will allow you to switch between U/L SSB. I am setting mine up this way to allow USB for use on MARS. Mars uses USB regardless of frequency. I am also encoding split mode. This has been a total blast and a learning experience playing with this BITX40. ? v/r Fred W4JLE ? ? QUOTE- "If you set the VFO frequency to 26 MHz, the sideband is automatically inverted. You will not need to move the BFO from LSB to USB for 14 MHz". Then if that is true then setting the VFO frequency to 19Mhz? (19-12=7) will invert- (USB) for 7Mhz? Then enabling Digital modes?? Something the Raduino could do? Advise.... de W8LM -KANSAS
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You can download a copy from . It is well commented to aid in understanding the program. The software to compile it and upload to the VFO is available is free as well. Like you I just started with mine a few weeks ago and in addition to the BITX40 I bought a kit off of Amazon that comes with a number of sensors and programming examples that will be a learning experience in itself. ?The description is not in agreement with the programming and you will have to make pen and ink corrections to the sketch description. Randy, K7AGE has posted a pinout diagram that is correct and is in the groups history. ? In addition to fooling around with the BITX I am playing with designing a digital artificial horizon using a 2.8¡± TFT display for use on an experimental aircraft. ? The programming takes me back to my NASA days when we were trying to land on the moon with a computer with less power than the Arduino. ?Unlike today, we had to shoehorn everything into 4K. While the stack is limited even with all my changes I still have 40% left. ?I promise your head will swim with all the projects you realize you can do with the Arduino. ? V/R Fred W4JLE ? ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Marc Jones via Groups.Io
Sent: Thursday, February 09, 2017 02:40
To: [email protected]
Subject: Re: [BITX20] SDR kits VFO ? Hi Fred, I would very much like the Sketch ?for the BITX-40 ... I would then try having a play around with it, Although my programming is very rusty for sure ... Marc 'Gw0wvl' .. ? On Thu, 9 Feb 2017 at 1:06, Dr Fred Hambrecht The formula for upper and lower sideband is explained in the sketch. Simply uncommenting a few lines and adding the Fbutton will allow you to switch between U/L SSB. I am setting mine up this way to allow USB for use on MARS. Mars uses USB regardless of frequency. I am also encoding split mode. This has been a total blast and a learning experience playing with this BITX40. ? v/r Fred W4JLE ? From: [email protected] [mailto:[email protected]] On Behalf Of Lawrence Macionski via Groups.Io
Sent: Wednesday, February 08, 2017 12:41
To: [email protected]
Subject: Re: [BITX20] SDR kits VFO ? QUOTE- "If you set the VFO frequency to 26 MHz, the sideband is automatically inverted. You will not need to move the BFO from LSB to USB for 14 MHz". Then if that is true then setting the VFO frequency to 19Mhz? (19-12=7) will invert- (USB) for 7Mhz? Then enabling Digital modes?? Something the Raduino could do? Advise.... de W8LM -KANSAS
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Hello all, A friend of mine has SDR Kits DDS VFO + working Bitx40, and I asked him about solution. He confirmed what?Jerry, KE7ER said: add 20-30pF cap and and also maybe to rewind L5 coil. You need to "pull down" freq by 3 kHz, and you will be able to hear LSB. No other settings on DDS is needed. Regards,
Dragan, 4O4A
Bitx40 with Raduino
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Thanks Rob, Ile have a decent look later , Fire up the PC , Only so much I can do with the smart phone ..
Regards
On Thu, 9 Feb 2017 at 10:01, G4NQX <tasmod@...> wrote: Marc, Look in the Files section, possibly second page, for "BitX40 sketch using new si5351 library v2 "? The sketch and library are in there.? It's the Raduino sketch with two words changed to suit the new v2 library.
--
Rob G4NQX
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Thanks Rib, Ile fire up the PC when home and have a Decent look .... The smart phone is OK but limited ...?
Regards?
On Thu, 9 Feb 2017 at 10:01, G4NQX <tasmod@...> wrote: Marc, Look in the Files section, possibly second page, for "BitX40 sketch using new si5351 library v2 "? The sketch and library are in there.? It's the Raduino sketch with two words changed to suit the new v2 library.
--
Rob G4NQX
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Marc, Look in the Files section, possibly second page, for "BitX40 sketch using new si5351 library v2 "? The sketch and library are in there.? It's the Raduino sketch with two words changed to suit the new v2 library.
--
Rob G4NQX
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Hi Fred, I would very much like the Sketch ?for the BITX-40 ... I would then try having a play around with it, Although my programming is very rusty for sure ...
Regards
On Thu, 9 Feb 2017 at 1:06, Dr Fred Hambrecht <AAR4MI@...> wrote: The formula for upper and lower sideband is explained in the sketch. Simply uncommenting a few lines and adding the Fbutton will allow you to switch between U/L SSB. I am setting mine up this way to allow USB for use on MARS. Mars uses USB regardless of frequency. I am also encoding split mode. This has been a total blast and a learning experience playing with this BITX40. ? v/r Fred W4JLE ? From: [email protected] [mailto:[email protected]] On Behalf Of Lawrence Macionski via Groups.Io
Sent: Wednesday, February 08, 2017 12:41
To: [email protected]
Subject: Re: [BITX20] SDR kits VFO ? QUOTE- "If you set the VFO frequency to 26 MHz, the sideband is automatically inverted. You will not need to move the BFO from LSB to USB for 14 MHz". Then if that is true then setting the VFO frequency to 19Mhz? (19-12=7) will invert- (USB) for 7Mhz? Then enabling Digital modes?? Something the Raduino could do? Advise.... de W8LM -KANSAS
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You can only go Positive with the SDR kits VFO...
On Thu, 9 Feb 2017 at 6:30, marjannorm@... <marjannorm@...> wrote: Hi, when you put in the IF frequency, you did remember the negative off-set didn't you? kind regards Norm vk5gi McLaren Vale South Australia
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Hi, when you put in the IF frequency, you did remember the negative off-set didn't you? kind regards Norm vk5gi McLaren Vale South Australia
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Marc!
IF you want the Rx to work on 14, try bypassing the rx filter which will
remove all higher frequencies! L1 L2 L3 filter chain!
Remove C91 as that would load the external VFO.
Raj
At 09/02/2017, you wrote:
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Hi, I've tried IF frequencies of
19 MHz , 26 MHz, 12 MHz ... Basically any frequency I could think of ..
None of them work the? BITX-40 on LSB, The frequency of 19 MHz
results in basically a dead radio, No RX At all , Same goes for 26 MHz,
It's a strange one, This SDR kits VFO works fine, It looks good on the
scope and goes upto 160 MHz easily.. But it just won't work on the
BITX-40 ..
Marc? 'Gw0wvl'
- On Wed, 8 Feb 2017 at 14:14, Ashhar Farhan
- <farhanbox@...> wrote:
- If you set the VFO frequency to 26 MHz, the sideband is automatically
inverted. You will not need to move the BFO from LSB to USB for 14
MHz.
- - f
- On Wed, Feb 8, 2017 at 7:13 PM, Marc Jones via Groups.Io
<gw0wvl@...> wrote:
- Hi Joel, I've tried all sorts of different frequencies in the IF fir
the SDR VFO, If I take? the frequency just below 12 MHz all that
happens is that? Transmit /Receive frequency is off by a few KHz ..
Etc... So the display on the SDR kits VFO might show 7.100 but I'm
actually on 7.098 .. But still on USB . and visa versa ..but all the time
it USB..
- Marc Gw0wvl
- On Tue, 7 Feb 2017 at 14:12, Raj vu2zap
- <vu2zap@...> wrote:
- Oops it was 11.998500
- At 07/02/2017, you wrote:
- What worked for me is 1.99985
- At 07/02/2017, you wrote:
- Mark,
- You need to set the IF to 11998000 because you subtract the BFO
frequency from the IF.
- Joel
- KB6QVI
- On Feb 7, 2017, at 5:46 AM, Marc Jones via Groups.Io
< gw0wvl@...> wrote:
- I've recently built a SDR kits VFO (3.5 to 160
MHz) .. It's working fine, But when I connect it to my BITX-40 the LSB is
flipped to USB .. I've put the IF as 12.0 MHz and the VFO range is 4.8 -5
MHz .. To cover 7.0 -7.200 ... Any ideas why it flips the Sideband
?
- Regards Mark
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The formula for upper and lower sideband is explained in the sketch. Simply uncommenting a few lines and adding the Fbutton will allow you to switch between U/L SSB. I am setting mine up this way to allow USB for use on MARS. Mars uses USB regardless of frequency. I am also encoding split mode. This has been a total blast and a learning experience playing with this BITX40. ? v/r Fred W4JLE ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Lawrence Macionski via Groups.Io
Sent: Wednesday, February 08, 2017 12:41
To: [email protected]
Subject: Re: [BITX20] SDR kits VFO ? QUOTE- "If you set the VFO frequency to 26 MHz, the sideband is automatically inverted. You will not need to move the BFO from LSB to USB for 14 MHz". Then if that is true then setting the VFO frequency to 19Mhz? (19-12=7) will invert- (USB) for 7Mhz? Then enabling Digital modes?? Something the Raduino could do? Advise.... de W8LM -KANSAS
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Hi ?Jerry, I'm using another radio to confirm this (ICOM 706) into a Dummyload ..... SDR ... Software defined Rubbish ?.. Ha ?73 my friend .
On Wed, 8 Feb 2017 at 21:49, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: You sound like you know what you are doing, but it might be worth asking: How do you know it is receiving USB when using the SDR VFO?? You might redo your measurements, reading the VFO frequency at the Q7 collector, and also the BFO frequency at the Q11 emitter. Make sure the VFO is around 5mhz, and that the BFO doesn't somehow get shifted down in frequency by 3khz or so from its nominal 12mhz value when you drape that SDR VFO cable over the top of it. ?Verify that you are receiving the same 40m amateur signals (not something out of band, not some AM SW broadcaster), but the SDR VFO flips the received signal from LSB to USB. ?
Then bury the whole kit deep somewhere. ?Outside the churchyard. ? Jerry, KE7ER
On Wed, Feb 8, 2017 at 01:11 pm, Marc Jones wrote:
It's very strange .. ?
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You sound like you know what you are doing, but it might be worth asking: How do you know it is receiving USB when using the SDR VFO?? You might redo your measurements, reading the VFO frequency at the Q7 collector, and also the BFO frequency at the Q11 emitter. Make sure the VFO is around 5mhz, and that the BFO doesn't somehow get shifted down in frequency by 3khz or so from its nominal 12mhz value when you drape that SDR VFO cable over the top of it. ?Verify that you are receiving the same 40m amateur signals (not something out of band, not some AM SW broadcaster), but the SDR VFO flips the received signal from LSB to USB. ?
Then bury the whole kit deep somewhere. ?Outside the churchyard. ? Jerry, KE7ER
On Wed, Feb 8, 2017 at 01:11 pm, Marc Jones wrote: It's very strange .. ?
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Sorry for spelling your name wrong Rob, Predictive text ... Apologies.
Regards?
Marc 'Gw0wvl'?
On Wed, 8 Feb 2017 at 19:44, G4NQX <tasmod@...> wrote: If you want another Pic to try I'm happy to post you mine.? It's redundant anyway.
--
Rob G4NQX
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My BITX-40 only came with the Raduino, It works fine, No issues, In fact I've two BITX-40 here and both work as they should , Both are the versions with the Raduino ... Both are on LSB, No mods to the BFO on either BITX-40 S .... Plug the SDR kits VFO into either BITX-40 and they immediately change to USB .. 4.8 to 5 MHz ?on USB ... Anyway I've given up on the SDR kits VFO at this time, It's in the junk pile waiting for another day .
Regards?
On Wed, 8 Feb 2017 at 19:43, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: Marc, OK, back to your original post: > ?I've recently built a SDR kits VFO (3.5 to 160 MHz) .. It's working fine, But when I connect it to my BITX-40 the LSB is flipped to USB ..I've put the IF as 12.0 MHz and the VFO range is 4.8 -5 MHz .. To cover 7.0 -7.200 ... Any ideas why it flips the Sideband ??
Let's get this straight. ?The Bitx40 worked correctly out of the box at 7mhz on LSB, using either an analog VFO or the Raduino. ?You disabled the original VFO (removed L4, unplugged any Raduino) and plugged in your SDR Kits VFO into the Bitx40's DD51 connector. ?Didn't mess with the BFO. ?And now the Bitx40 is tuning 40 meters as before, except you are on USB? ? You said that "the VFO range is 4.8-5 MHz". ?Did you use your scope to check the frequency coming out of the VFO? ?I'm betting it is up at 19mhz, not 5mhz. ?Might be less confusing to just tell the VFO an offset of zero, then set the VFO freq to 5mhz. ?See if that gives you 7mhz LSB operation.?
Jerry?
?Wed, Feb 8, 2017 at 10:55 am, Marc Jones wrote:
Hi, I've tried IF frequencies of 19 MHz , 26 MHz, 12 MHz ... Basically any frequency I could think of .. None of them work the ?BITX-40 on LSB, The frequency of 19 MHz results in basically a dead radio, No RX At all , Same goes for 26 MHz, It's a strange one, This SDR kits VFO works fine, It looks good on the scope and goes upto 160 MHz easily.. But it just won't work on the BITX-40 .. ?
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Hi Rib I can't gety SDR kits VFO to do modes or show modes, The RIT works, So Does the VFO A and B, The clear button, works ?And I can get into the Calibrate mode etc , So that all seems OK ... But no modes at all ..
Regards?
On Wed, 8 Feb 2017 at 19:43, G4NQX <tasmod@...> wrote: It doesn't work on the mode pins then ??? Must admit instructions are confusing, one table says 9 & 14 and 9 & 15.? Next table says 9 only then 9 & 15 if that makes sense.? If you have it wrong it will do a cw shift of about? point 75kHz only.? 750Hz in other words.
--
Rob G4NQX
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Jerry I can confirm the VFO ?output is ?at 4.8 to 5 MHz ... It's all very strange for sure .. It's got me scratching my head , I've given up on the thing for now, It's in the draw , Ile use it as a basic signal generator , Ile box it up as this ... It's a shame as it looked promising for sure ?..my next thing then is to get a Copy of the Sketch for the Raduino that's used on the BITX-40 ..
Regards?
On Wed, 8 Feb 2017 at 20:04, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: In your last post, you say: ? "The actual VFO output is doing as it should according to the scope and frequency counter" By that, do you mean that you measured the frequency, and verified it is at 5mhz? ?If so, then the only way I see for it to be on USB is if the BFO got moved, perhaps by adding capacitance at C103. ?If that's the case, then either restore the BFO to where it was out of the box (move it back up in freq by about 3khz), or move your VFO to 19mhz (no offset, 19mhz as measured with the scope at the VFO output). Jerry On Wed, Feb 8, 2017 at 11:43 am, Jerry Gaffke wrote:
Did you use your scope to check the frequency coming out of the VFO? ?I'm betting it is up at 19mhz, not 5mhz. ?
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Yes Jerry, The SDR kits VFO appears to be working as it should, It corresponds with my external counter , No problem at all , It's also not the BITX-40 , If I unplug the ?SDR kits VFO and plug in the Digital Raduino VFO that came with the BITX-40 it's immediately back on LSB... Unplug the Raduino and plug the SDR kits VFO back in and it's back to USB ... It's very strange ..
Regards?
On Wed, 8 Feb 2017 at 20:04, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: In your last post, you say: ? "The actual VFO output is doing as it should according to the scope and frequency counter" By that, do you mean that you measured the frequency, and verified it is at 5mhz? ?If so, then the only way I see for it to be on USB is if the BFO got moved, perhaps by adding capacitance at C103. ?If that's the case, then either restore the BFO to where it was out of the box (move it back up in freq by about 3khz), or move your VFO to 19mhz (no offset, 19mhz as measured with the scope at the VFO output). Jerry On Wed, Feb 8, 2017 at 11:43 am, Jerry Gaffke wrote:
Did you use your scope to check the frequency coming out of the VFO? ?I'm betting it is up at 19mhz, not 5mhz. ?
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In your last post, you say: ? "The actual VFO output is doing as it should according to the scope and frequency counter" By that, do you mean that you measured the frequency, and verified it is at 5mhz? ?If so, then the only way I see for it to be on USB is if the BFO got moved, perhaps by adding capacitance at C103. ?If that's the case, then either restore the BFO to where it was out of the box (move it back up in freq by about 3khz), or move your VFO to 19mhz (no offset, 19mhz as measured with the scope at the VFO output). Jerry
On Wed, Feb 8, 2017 at 11:43 am, Jerry Gaffke wrote:
Did you use your scope to check the frequency coming out of the VFO? ?I'm betting it is up at 19mhz, not 5mhz. ?
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If you want another Pic to try I'm happy to post you mine.? It's redundant anyway.
--
Rob G4NQX
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Dragan 4O4A
Marc Jones
Raj vu2zap