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

Tim Gorman
 

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

On Tue, 26 Jun 2018 04:30:56 +0530
"Raj vu2zap" <@Raj> wrote:

Allard,

The pic attached is in 50Khz horizontal display.

Raj

At 26/06/2018, you wrote:
Hi Akira san,

But the spurious at 75KHz was observed.

I guess you mean 75 MHz (not kHz)?

The spurious might be the multiple of 25KHz.

In that case it could be a harmonic of 25 MHz (not kHz). Perhaps it
comes from the 25 MHz crystal in the Raduino?

73 Allard PE1NWL

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

Russ KG0BK
 

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

Yet another si5351

Ashhar Farhan
 

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

Ashhar Farhan
 

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@...> 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


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

Vince Vielhaber
 

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, <@Russ_KG0BK
<mailto:@Russ_KG0BK>> 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


Noise Burst #bitx40

John
 

Any simple cure for the noise burst when you key the mic? There is a burst of noise from the speaker as well as a transmitted noise burst.
I see some suggest that the audio preamp  Q16 stays active after change-over to transmit due to residual charge in the supply line filter capacitor.
Maybe there needs to be some sequencing of the Tx/Rx change over relays so the audio and antenna relay switches before the Tx/Rx power supply relay.
Any suggestions?
--
John VK6JAH

Re: W8TEE Power/SWR Sketch for Nano

Nick VK4PP
 

Kees, I'm very interested in this too!
Please share more if you care too.
I have a Kits an parts bridge and am incorporating that + Arduino + 2x8 LCD and a Pi tuner into a portable box for my ubitx... 

I would love to use the AD8307s  instead of diode detectors... 

I am basing mine on: http://www.kk5jy.net/swr-meter-v1/ and http://www.qsl.net/on7eq/projects/arduino_pwr_swr.htm

Cheers.

Re: W8TEE Power/SWR Sketch for Nano

Jerry Gaffke
 

Regarding code for your Tandem Match SWR meter,
below is where my code was parked a couple months ago.
It may or may not be stuff you can use.

I haven't made time yet to fully implement it, though I'm pretty sure it's very close to good.

I'm not planning to talk to anything like the OLED, will use the Raduino's LCD

I am planning to just read Diz's diode detectors (with a slight dc bias current through the diodes)
using the Nano's 10 bit ADC's.  

The code that converts the AD8307 log response to volts is unused and has been commented out.
That 32 bit fixed point code works, but you are probably better of just using a floating point library as you won't
be pressed for flash space.

Jerry, KE7ER

###########################
void lcd_printline(char n, char* s) { // n=0 for top, n=1 for bottom
    lcd.setCursor(0,n);
    lcd.print(s);
    for (n=strlen(s); n<16; n++)  lcd.print(" ");
}
 
// Print val as d digits with r digits after the decimal point
// Will print any leading zeros, if r==0 then no decimal point
void pnum(uint32_t val, uint8_t d, uint8_t r) {
  uint32_t  div=1;
  uint8_t   n; 
  for (n=1; n<d; n++)  div*=10;
  while (div>0) {
    if (d--==r)   lcd.print('.');
    lcd.print(val/div);
    val = val%div;
    div = div/10;
  }
  lcd.print(" ");
}
 
 
//  // Accurately transform AD8307 readings to RF voltage per post 48570
//  int32_t adcSlope32 = 5922023;  // 0x7FFFFFFF * (0.025/2.50 * (20*m.log10(32.0/31)) );   5922023.090616257
//  int32_t adcSlope2048 = 91056;  // 0x7FFFFFFF * (0.025/2.50 * (20*m.log10(2049.0/2048))) 91055.92544695384
//  uint32_t  adcRFmax = 100UL<<24;         // Calibrated Volts*2**24 rms of RF when adcRead at 0xFFFF
//  uint32_t findVoltsRF(uint16_t adcRead)  {               // adcRead is 16 bit ADC read of AD8307's output
//    uint32_t voltsRF = adcRFmax;                          // At adcRead max of 0xFFFF, voltsRF is adcRFmax
//    int32_t  voltsADC = 0x7FFFFFFF - (adcRead<<15);       // Will subtract adcSlope from this till goes negative
//  
//    // The RF voltage falls by 1/32 for each drop in voltsADC by adcSlope32
//    while (voltsADC > 0)  {                                       // while (voltsADC > adcRead<<16)
//      voltsRF = voltsRF - (voltsRF>>5);           // voltsRF *= (31.0/32)
//      voltsADC = voltsADC - adcSlope32;
//    }
//    while (voltsADC < 0) {
//      voltsRF = voltsRF + (voltsRF>>11);
//      voltsADC = voltsADC + adcSlope32/65-52;
//    }
//    return(voltsRF);
//  }
// Read TandemMatch's 2 detectors, display forward and reverse power, swr
#define PSCALE  (1023L*1023/(25*10)) // ADC max of 1023 is 25 Watts, display Watts*10
void  show_swr() {  // SWR = (1+1.0*vr/vf)/(1-1.0*vr/vf);
  uint32_t vr, vf, swr; // Voltage squared proportional to power
  vf = analogRead(RF_FWD); // Peak RF volts from forward detector
  vr = analogRead(RF_REV); // Peak RF volts from reverse detector
  if (vr>=vf) swr=0; // If vr,vf illegal, force SWR to zero
  else {
    swr = (vr*1024)/vf; // Voltage ratio, 10 fractional bits
    swr = (1000*(1024+swr))/(1024-swr); // 1000*swr, nearly 10 fractional bits
    swr = (swr+50)/100; // 10*swr, rounded to nearest tenth
    if (swr>99) swr=99;  // Display a max SWR of 9.9
  }
  lcd.setCursor(0, 1); // Fill bottom LCD line, example:
  lcd.print('f'); pnum(vf*vf/PSCALE,3,1); // "f12.4 r03.1 s1.7"
  lcd.print('r'); pnum(vr*vf/PSCALE,3,1); // with fwd,rev power in watts
  lcd.print('s'); pnum(swr,2,1); // and swr to max of 9.9
}
 

On Mon, Jun 25, 2018 at 06:57 pm, Kees T wrote:
all I need now is some code......

Re: Noise Burst #bitx40

Nick VK4PP
 

Re: KD8CEC - Nextion Display - IAN questions

Michel Dupuy
 

Hello
i tried hexuploader and it does not work with nano arduino while it works with arduino uno. he puts as a message:

avrdude: stk500v2_ReceiveMessage (): timeout
avrdude: stk500v2_ReceiveMessage (): timeout
avrdude: stk500v2_ReceiveMessage (): timeout
.
.
.avrdude: stk500v2_ReceiveMessage (): timeout
avrdude: stk500v2_ReceiveMessage (): timeout
avrdude: stk500v2_ReceiveMessage (): timeout
avrdude: stk500v2_ReceiveMessage (): timeout
avrdude: stk500v2_ReceiveMessage (): timeout
avrdude: stk500v2_ReceiveMessage (): timeout
avrdude: stk500v2_getsync (): timeout communicating with program


It does not matter, I will wait to have the source files.

Thank you

Michel

Re: W8TEE Power/SWR Sketch for Nano

Jerry Gaffke
 

Kees,

Also, both your implementation and my implementation use the single ADC
in the Arduino to read the forward and reverse channels one at a time
There will be a significant delay between readings.
That delay will likely be too large for accurate SWR readings
during SSB phone use, as per Dr Bill's objection of a month or two ago.
However, those SWR readings should be accurate when transmitting CW.


On Mon, Jun 25, 2018 at 09:54 pm, Jerry Gaffke wrote:
Regarding code for your Tandem Match SWR meter,
below is where my code was parked a couple months ago.
It may or may not be stuff you can use.

Re: Understanding Spurious Emissions

Jer Tres
 

It would 
have to pass down to 28.0 for CW” but not needed for cw so maybe easier to just switch it out below 28.3

Re: W8TEE Power/SWR Sketch for Nano

Glenn
 

Kees, i'm in the middle of a similar project.  2 x AD8307's. The bridge uses a balun core. PCB is 50x50mm.   No Nano etc.

There is a neat SWR meter here using the AD8307's but with a Teensy. https://sites.google.com/site/lofturj/power-and-swr-meter---rev

A very interesting SWR meter is here. It auto computes SWR using an LM555. I use this in my shack and it works well. http://www.qrp4u.de/index_en.html

Glenn vk3pe


On Mon, Jun 25, 2018 at 06:57 pm, Kees T wrote:
OK, so


all I need now is some code......

73 Kees K5BCQ

Re: W8TEE Power/SWR Sketch for Nano

Glenn
 

forgot the picture......

Re: Noise Burst #bitx40

John
 

Thanks Nick.

I will try that fix for the audio amp noise burst by muting the LM386 via pin7.

Seems that there are two problems here.
One is the audio noise burst which your fix addresses.
The other is a burst of RF noise as charging capacitors in the microphone amp unbalance the balanced mixer at the start of a transmission.

I have looked through the Wiki and there are lots of discussions about curing the audio burst, there is not much about fixing the RF noise burst.

I have been thinking about putting a FET in the line from the mic amp to the balanced mixer to act as an isolating switch while the mic amp settles down. Use an RC time constant on the gate to delay turn on. Use some steering diodes so that the fet is on via the Rx line during receive, goes off when the Rx/Tx changeover occurs and comes on after a delay via the Tx line when in transmit.

-Cheers-
John VK6JAH

Audio kit orders

Les Preston
 

Hi there,
If I'm not too late, could you put me down for one of each of the anti click and agc kits please. Payment has been sent.
Regards,
Les
M0BSI.

SSM2167 wiring.

M0CLS
 

Hi, can someone explain how to wire the ssm2167 into the mic circuit on the ubitx please? 

Thanks Carl.

Re: KD8CEC - Nextion Display - IAN questions

Lowell Haney NE4EB
 

Michel,

If you have the Arduino IDE, there is a command line utility built into the package. it is called "AVRDude" and can be executed from a terminal window. Here is the command line that works with my setup.

avrdude -pm328p -carduino -P/dev/ttyUSB0 -b57600 -Uflash:w:ubitx_CEC1.01.hex:i

The filename you want to load  (.hex file) is just after the 'w:'  I execute this line after navigating to the file location directory/file in the terminal program. The help function for avrdude explains all the switches that can be invoked.

Hope this helps.

Re: Keypad for Raduino...?

Mike Woods
 

This is not quite correct.  This sketch is a hack that would work but the TTP229 is a true i2c device.  See the following use case that deploys the wire library:


This is an easy add to the uBITx for somebody wanting a keypad ... but why not use a Nextion display with KD8CEC firmware?  It already has firmware built to provide touchpad frequency entry in the UI!

It is a bit the same as building an analogue S-meter when KD8CEC firmware and Nextion already feature a classy digital S-meter that can be calibrated easily...

There are always different ways of doing things, but some ways are easier than others!

Mike ZL1AXG

Mike

On Tue, 26 Jun 2018 at 3:38 AM, Robert McClements <gm4cid@...> wrote:
Arv,

The TTP229 capacitive  keyboard has two pins labelled SCL and SDO but unfortunately they are not I2C.

The way that they work is SCL is clocked frequently up to 16 times and during each clock cycle SDO is
checked. If a key is pressed SDO will return a Low, the count stops and the clock count equates to
the key number. Hope that makes sense, not easy to put into words.

So this device will require the use of two digital pins.


Regards,

Bob GM4CID

Sample code below :-

 // Routine to read if a key is pressed and return its value
byte Read_Keypad(void)
{
   byte Count;
   byte  Key_State = 0;
   for(Count = 1; Count <= 16; Count++) // Pulse the clock pin up to 16 times and read the state of the data pin on each pulse
   {
      digitalWrite(Clock_PIN, LOW);
      if  (! digitalRead (Data_PIN)) // data pin low store the current key number
         Key_State = Count;
      digitalWrite(Clock_PIN, HIGH);
   }
   return Key_State;

Re: RFI from uBitx TX after AGC and other mods installed

Don, ND6T
 

Alan, Sorry for the relay info. I see what you are getting to now. Do you have a "pop fix" modification in place (any flavor)?
Rowland: What happens if you unplug the AGC board (everything else still connected) and transmit? Does the feedback go away? -Don