Date   
Re: Keypad for Raduino...?

GM4CID
 

Mike,

Well, thank you for that information about the TTP229.
The code I found did the job for an HDSDR controller project that was eventually abandoned
even although it worked as planned. The ergonomics just didn't work for me.

Having also built a Nextion controller my preference is to complemented the touch inputs
with knobs and buttons for tuning and certain other most frequently used controls.

I agree 100% with your comment about adding an external S-meter with the Nextion display.

73 Bob GM4CID

Re: KD8CEC - Nextion Display - IAN questions

Michel Dupuy
 

Merci
Je vais essayer .
Ce n est pas grave si cela ne fonctionne pas.
Je ne suis pas habitué au lignes de commande.
J utiliserai IDE Raduino lorsque on aura le fichier source.
De toutes façon j ai aussi un PC et là pas de problèmes.

Re: Bitx40 75KHz Spurious, How to solve it. #bitx40

 

Tim.

That is the marker M 7.049 , its very low in level and not seen.

Raj

At 26-06-18, you wrote:
It shows scanning from 7.029Mhz to 7.049Mhz. That's only a 20khz
scan, not 50khz. And certainly not 50khz per division on the screen.

The funny thing is that those unknowns are *increasing* in amplitude as
you move away from the carrier instead of decreasing. I'm not sure what
would generate this.

Could these be products from overdriving the spectrum analyzer?

tim ab0wr

Re: Microscope - - new thread

Terry Morris
 

This is what I bought for $29 plus shipping, https://www.amazon.com/Digital-Microscope-KLAREN-Endoscope-Magnifier/dp/B071K6364L?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duckduckgo-d-20&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B071K6364L There were no comments whether it was compatible with Linux. For less than $30 I can tell you that it is not compatible with Linux. Its a cute toy but for the $29 I could bought a nice meal for my canine and I. LOL

Terry - KB8AMZ
Brimfield Twp, OH  USA
Linux User# 412308, Ubuntu User# 34905


On Fri, Jun 22, 2018 at 7:30 PM Don, ND6T via Groups.Io <nd6t_6=yahoo.com@groups.io> wrote:
The little microscope with the screen looks like fun! Trouble is, though, a stereoscopic microscope helps a bunch. Nothing like a bit of depth perception to help guide your hot soldering iron to its destination. Same goes with trying to pick up something. Trying to do that with one eye gets old fast. Although I like the dental loupes at times, they don't have the amplification and since they are mounted on my head the focus wanders as I move and my neck starts to feel it after a while. K9AC's SolderScope gives a better, more stable view. Yes, it takes some DIY innovation but check out his wooden stand that he made from scrap. Until somebody gives me a Mantis Elite I prefer the SolderScope. It's smaller, too. 73, Don

Re: Keypad for Raduino...?

Dennis Zabawa
 

Here are a number of hardware devices that are applicable to uBITX operator interface designs:
 
 
 Operator Interface (Keypad):
     PDN1144  Four Row by Four Column Keypad Interface IC     pdn1144.pdf
     PDN1188 Eight Row by Eight Column Keypad Interface IC     pdn1188.pdf
 
Operator Interface (Text LCD)
     PDN702 Character LCD Controller IC     pdn702.pdf
 
Operator Interface (7-Segment LED)
     PDN707 Hex Display 7-Segment LED Driver     pdn707.pdf
     PDN747 Eight Digit Seven-Segment LED Controller/Counter     pdn747.pdf
 
Mechanical Pushbutton Interface
     PDN2008 Eight Channel Contact Debouncer     pdn2008.pdf
     PDN2108A One-of_Eight Latching (one output active)     pdn2108.pdf
     PDN2108D One-of-Eight Latching (one or zero outputs active)     pdn2108.pdf
     PDN2208 Eight Channel Toggle     pdn2208.pdf

Re: Output power

Terry Morris
 

I have a 5 watt dummy load consisting of 5-1 watt carbon resistors, gold band, soldered into a PL-259 connector circa 1970's. It was given to me from an elderly ham, now SK. He learned I was starting the hobby with a QRP kit built HW-9. He told me he tried QRP once but it was too difficult making contacts. Thought I would like the low power heater. I do.

Terry - KB8AMZ
Brimfield Twp, OH  USA
Linux User# 412308, Ubuntu User# 34905


On Wed, Jun 20, 2018 at 7:13 PM brad martin <emclinux@...> wrote:
Thank you all for the replies. Unfortunately my idea on paper does not look like it’s going to work out based on my experiments last night. My idea was that I have a cb type swr meter and I was going to make it into a digital swr and power meter and well being that it’s not for Hf the output voltage of the meter didn’t line up with output power. .6v on 80, 1v on 40 and 30 and 1.5v on 20. So oh well on that one. I have Arduinos all over the place so using a mega for this is not a loss for me. I almost use them as coasters at this point. I would see a deal on them and get them over the last few years and as far as time goes I always try to make time for my hobbies because life is short right :).

I have seen the dummy load with a cap and diode before and have been planning on adding that to my dummy load as well. When choosing the diode what properties are you looking for?

I have a goal most people would probably say I’m crazy for doing. The plan is that my first HF contact will be done using things I have made, built, or repaired. So far everything I have (power supply, uBITX, antenna, CW paddle, dummy load, and other random stuff) and the swr meter is the only thing I have left that has not has been modified.

73
Brad
KG5SPR
On Wed, Jun 20, 2018 at 3:39 PM Jerry Gaffke via Groups.Io <jgaffke=yahoo.com@groups.io> wrote:
The BAV21 is not a bad choice for the dummy load dectector.
Very cheap, which is of course my primary criteria.

Forward voltage drop appears to be around 0.5v at 0.1ma from their graphs,
the detector would have a much smaller current going through it.
So should still be able to measure 10mW into the dummy load,
though factoring in that drop to the calculations becomes more important than with the 1n5711. 

I'd still use the 1n5711 for the diode RF probe.

Jerry



On Wed, Jun 20, 2018 at 12:27 pm, Jack Purdum wrote:
We use a BAV21 diode in our design, which is rated at 250V.
 

Re: amp for ubitx4

Stephanus K6NG
 

do you connect this amp to the speaker wires from the uBitx or do you take the audio from before the audio amp on the uBitx board?

thanks
 Stephanus

Re: Microscope - - new thread

Don, ND6T
 

Terry, on Linux try Cheese. My Celestron (which is very similar in appearance) and my 10 meter endoscope work with that program. No, aside from documentation photos, it is just a toy. -Don

Re: Noise Burst #bitx40

 

John et al : 

The RF burst on PTT closure, on the BITX40, has been addressed by Allard (PE1NWL) in his Raduino Code.  

https://github.com/amunters/bitx40

His approach is to shut down the CLK output on the SI5351 for 50 mS on PTT closure and wait for things to settle before re-enabling it to allow TX.  

There is also a simple hardware mod that can be used to reduce this burst from 50 mS to less than 20 mS so that the delay time can be reduced in the code.
The mod is to change C124 from 47uF to 4.7 uF. C124 is near Q12 (mic input).  See message #29101 in this group for the original discussion on this. 

Cheers

Michael VE3WMB 

Re: Microscope - - new thread

Terry Morris
 

Thanks Don. I will try Cheese. The article in QQ was over 1 year too late. I ordered the toy in March 2017 after reading some other ham's alleged success with it. I have returned to using Optical headband lenses and other magnifiers that clip on to my reading spectacles.

73,
Terry - KB8AMZ
Brimfield Twp, OH  USA
Linux User# 412308, Ubuntu User# 34905, PCARS#78, NAQCC#6668, QRP-ARCI#8855, SKCC#14195


On Tue, Jun 26, 2018 at 8:25 AM Don, ND6T via Groups.Io <nd6t_6=yahoo.com@groups.io> wrote:
Terry, on Linux try Cheese. My Celestron (which is very similar in appearance) and my 10 meter endoscope work with that program. No, aside from documentation photos, it is just a toy. -Don

Re: Noise Burst #bitx40

 

Here is full description (from message #27395) of what is happening : 

"When the radio goes into TX, that cap has to charge up via R127 -- which takes a LONG time.  During that time, Q12 is also powering up and C122 has been sitting at zero volts, so it starts charging as well.  This is the response of the Microphone Amplifier to the rising edge of the TX signal -- and the net result is that the Balanced Mixer (T4/D15/D16) is knocked out of balance until the amplifier stabilizes.  The result of that is a spurious RF transmission that looks like the one I have attached as a file.  The RF rises almost immediately to about 5-8 watts, within 5 ms drops down to about 3 watts, builds back up to 5-8 watts in another 5 ms, then slowly decays over a period of 60 ms decays down to close to zero.  (All of this observed with the PTT line held)."

The thread starts with message #27393.

Cheers

Michael VE3WMB 

Re: KD8CEC - Nextion Display - IAN questions

Lowell Haney NE4EB
 

"Je ne suis pas habitué au lignes de commande."

Neither was I, but I am learning.

Bon chance.

#ubitx safely putting on tight tuning knob #ubitx

JOHN CRONHELM <johncronhelm@...>
 

The knob without set screw is very difficult to push on the encoder.i am worried about pushing too hard in case I damage the encoder. Can anyone give me advice.
Many thanks,
John Vo1jcc.

Re: #ubitx safely putting on tight tuning knob #ubitx

Latham, Chip
 

I think there is something wrong (possibly) with the encoder switch. Mine is not that hard to push maybe 10 ounces of force.
You can get another encoder or what I would do and am planing is to do is just not use that switch and simply replace it with a panel switch. I end up changing frequency when pushing mine and its making me nutz. N5FJK Chip

Re: Understanding Spurious Emissions

ajparent1/KB1GMX
 

Farhan,

The math is simple but the LO is not a direct contributor yet required.  I considered 2if-LO as possible
as well as aboth follow the spur. Usually 2if spurs only show up when we hit the 1db compression
point of the mixer and then they stat to grow.  This spur is there even when the mixer input (45mhz)
is -30dbm.

Changing the LO does not help.  The spur is 45mhz (IF)  minus output frequency (dial frequency)= spur

So for 45mhz and 28mhz out  the spur is 17mhz.  Change to a low side LO to 45-17mhz(new lo)=28 plus spur plus 
mixer leakage and the IF-dial frequency spur.   Measured isolation for the mixer was about 40db varied about 1 db
from that with frequencies so the mixer is very good but not perfect.

Remember your line and mine, DBM is a conundrum [headaches] in three ports.  Any of the ports are an
input AND output so even if we assume the RF port is the signal out its also a signal in.  So the LO generates
28mhz if its 73mhz or 17mhz and the spur will be the IF always 45mhz minus the output frequency and the
lo is required but what frequency is only dependent on creating the output frequency.  Happens with
commercial mixers too. 

It works up to 20mhz as the spur frequency is more than the lowest low pass.  The spur being an image
spur goes down with increasing frequency. So at some point a low pass filter cannot stop it.  

Nyquist sampling theory forecasts it.  At 22.5mhz is the alias point the spur overlaps the
generated frequency.  So does Spurtune[program].   Higher IF greater than 60mhz would
work.  Or the traditional solution band pass filters above 20mhz and low pass filter below that.   

Also the assumption is when not talking there is no spur (false) as you sill have carrier
leakage so 45mhz is always there.

It does not appear for CW as the mixer has bias on it to make it a switch and the LO is at signal frequency
without any significant mixing action and nothing else to mix with.

Allison

Re: Keypad for Raduino...?

Felix Lopez
 



I want do something similar with the raspberry pi3 and it's own touch screen. Can use code segments from another project to do this maybe i2c? Any help would be appreciated.  Thanks.

Re: Schematic . . . What Schematic . . mine?

William Cullison
 

i think I need to start a notebook. I'll order parts quite often from Chaina and by the time I have my parts I can't remember what they were ordered. At least I'm collecting a good supply of parts.

73 Bill WA8VIH/4

On Mon, Jun 25, 2018 at 11:14 PM, Vince Vielhaber <vev@...> wrote:
I do the same thing.  Mainly because I figure I won't remember it tomorrow!

Vince.



On 06/25/2018 11:00 PM, Ashhar Farhan wrote:
I always work with a lab notebook. Each time something is finished (as a
module or rig), i pull out the notebook, draw out the circuit and note
the readings and the performance. Then, move on. It is a habit worth
cultivating. In six month time you will forget what you built and why.
Building without a log book is filling a leaky bucket.

- f

On Tue, Jun 26, 2018 at 8:14 AM, <russkg0bk@...
<mailto:russkg0bk@...>> wrote:

    Ty Jon. That's about what I was saying.
    I'm I retired Broadcast Engineer an never kept a notepad (except hidden)
    Job security I guess. hi hi
    Just wanted those that were making mods to know.
    When some quits working. . . how do i get through this rats net to
    fond it.
    AGN TY
    73




--
  Michigan VHF Corp.   http://www.nobucks.net/   http://www.CDupe.com/
                          http://www.metalworkingfun.com




Re: Noise Burst #bitx40

Jerry Gaffke
 

Allard's fix to the Bitx40 carrier burst using a delay in the code is described here:
    https://groups.io/g/BITX20/message/33756
    https://groups.io/g/BITX20/message/34189


There is also Raj's fix, strictly hardware, no code:
    https://groups.io/g/BITX20/message/33707
    https://groups.io/g/BITX20/message/33742

Those are all in the same thread.
The rest of the thread is worth browsing as well.

Jerry, KE7ER


On Tue, Jun 26, 2018 at 05:35 am, Michael Babineau wrote:
John et al : 

The RF burst on PTT closure, on the BITX40, has been addressed by Allard (PE1NWL) in his Raduino Code.  

https://github.com/amunters/bitx40

His approach is to shut down the CLK output on the SI5351 for 50 mS on PTT closure and wait for things to settle before re-enabling it to allow TX.  

There is also a simple hardware mod that can be used to reduce this burst from 50 mS to less than 20 mS so that the delay time can be reduced in the code.
The mod is to change C124 from 47uF to 4.7 uF. C124 is near Q12 (mic input).  See message #29101 in this group for the original discussion on this. 

Cheers

Michael VE3WMB 

Re: JackAl Board Debut

Jack, W8TEE
 

We're using the SPI interface. It is a resistive touch panel. We're coding for the RA8875 chip and 5" and 7" displays.

Jack, W8TEE

On Tuesday, June 26, 2018, 11:03:14 AM EDT, AdverseYaw <w8vos@...> wrote:


That looks like just the thing I want for my uBitx.  What sort of interface should select when ordering the TFT display from BuyDisplay? They have the option of SPI or I2C with all the usual connectors.  I don't think an FFC connector would be appropriate.  Also, 5.0V power I think and a capacitive touch panel?  Just trying to get ahead of the game so when I receive the board from you guys I can get right to building.
73 de W8VOS, Kevin

Re: Bitx40 75KHz Spurious, How to solve it. #bitx40

Tim Gorman
 

Raj,

What then are the exact beginning and ending of the scan?

If the center frequency is 7.029Mhz then a 500khz scan would run from
6.779Mhz to 7.279Mhz.

I can come up with no spurious products that would result in an
harmonic progression increasing in amplitude as you move away from the
carrier frequency, especially as close in as 75khz.

The bitx40 uses a 12Mhz oscillator and a 5Mhz oscillator. I can't think
of a combination of these two frequencies that will give you a signal
at 7.104Mhz or 6.954Mhz as well as the carrier of 7.029Mhz.

I am still suspicious that something else is going on here besides
spurious products from the bitx40 itself.

tim ab0wr

On Tue, 26 Jun 2018 16:37:08 +0530
"Raj vu2zap" <@Raj> wrote:

Tim.

That is the marker M 7.049 , its very low in level and not seen.

Raj

At 26-06-18, you wrote:
It shows scanning from 7.029Mhz to 7.049Mhz. That's only a 20khz
scan, not 50khz. And certainly not 50khz per division on the screen.

The funny thing is that those unknowns are *increasing* in amplitude
as you move away from the carrier instead of decreasing. I'm not
sure what would generate this.

Could these be products from overdriving the spectrum analyzer?

tim ab0wr