Today I added a display, so now my the DG5 emulator actually emulates a DG5 in function – a digital display of your frequency. I also built some Arduino shield PCB’s using Eagle and have sent them off to Itead in China, should have them back in a couple of weeks.
Here’s the display in action:
Using a parallel LCD display because the frequency counter code uses an 8 bit Timer and the only 16 bit Timer on the 328 – most of the serial based libraries use the 16 bit timer as well, causing a conflict.
A few months ago, I bought a Kenwood TS-520S. The Kenwood hybrid’s are beautiful radios, and the TS-520 is the first radio I was on the air with (on amateur HF bands) while I was in High School in the early 80’s. So when I had an opportunity to pick one up locally, I jumped at it.
I have had a great time playing around with it and ragchewing. It takes a bit more work than my K3 or TS-2000 (tuning, calibrating) but that’s the beauty – it’s like an older car with points, condensers, and a carburetor – takes some more tweaking, but you can fiddle with it easily. I replaced the HV caps, adjusted the calibrator, and cleaned the switches and pots, but that’s about it. It just works.
I came across a site called Toddfun.com while doing some TS-520 searches, and found a series of very well documented posts (with in depth videos) about building a Kenwood DG-5 type display for the TS-520. The Kenwood DG-5 was an optional digital display for the TS-520/820, and on the used market they go for more than I paid for the radio! He was using the Arduino platform, something I have been using for a few years here. I thought, “I can do this!”, but instead of a display, I wanted to have it talk to my computer so my logging program (DXLab) could read the frequency of the radio.
There’s lots I could do better, and the Mega 328 isn’t the best platform to be doing frequency counting, updating a display, and servicing a serial port at the same time. The frequency counter needs the limited internal timers on the 328 which limits use of I2C, SPI, and software serial libraries as far as I can see. Nevertheless, getting the TS-520 to talk to my computer is what I set out to do, and it works beautifully!
A quick and dirty demo of it:
I don’t have a schematic for it, if you watch Todd’s video’s you can figure it out. Basically, the signals are buffered and conditioned by the TI PLL’s, the (HFO frequency needs to be pre-scaled as it’s outside the range of the Arduino counter), and the 3 are mux’ed into the Arduino on pin 5.
Arduino DG-5 code:
/*
Kenwood DG5 digital display emulator, sort of.
Stephen Leander, KV6O
August 22, 2014
No display in this revision, outputs Kenwood Commander commands on the Serial/USB port for a logging program (DXLab's Commander)
No idea if it will work with other programs because I haven't tested anything else!
Got the idea from Todd Harrison's website, Toddfun.com, where he outlined and built an Adrunio DG-5 emulator, with the plans of using this to display
the frequency, just like the DG-5.
Counter code based on Arduino timer code by Nick Gammon
http://www.gammon.com.au/forum/?id=11504
Emulates a TS-790 for DX Commander, based on input from Dave, AA6YQ:
From Dave AA6YQ, DXLab's author:
From: dxlab@yahoogroups.com [mailto:dxlab@yahoogroups.com] Sent: Tuesday, August 05, 2014 10:42 PM To: dxlab@yahoogroups.com Subject: [dxlab] Kenwood
>>>If your emulator responds to the ID; command with
ID007;
>>>Commander will think its controlling a TS-790. The only other commands to which your emulator will then have to respond are IF; and FB;
>>>Note: Commander pays attention to the following bytes of the radio's response to an IF; command:
3-13: VFO A frequency
29: RX vs TX status
30: Mode
31: VFO selection
33: split status
>>>Operation won't be convenient unless your emulator can correctly report the radio's mode.
See http://www.kenwood.com/i/products/info/amateur/ts_480/pdf/ts_480_pc.pdf for more on Kenwood command set.
8/22/14 - Version 1.0 Prototyped the circuit using 3 TI PLL's (74HC4046A's), a 74HC93 counter for prescaling the HFO, and 74HC153 for selecting the
signal (VFO, BFO, or HFO) to be counted by the Arduino on pin 5.
*/
//#define DEBUG //Uncomment for debugging
volatile unsigned long timerCounts;
volatile boolean counterReady;
// internal to counting routine
unsigned long overflowCount;
unsigned int timerTicks;
unsigned int timerPeriod;
unsigned long vfo = 0;
unsigned long bfo = 0;
unsigned long hfo = 0;
void startCounting (unsigned int ms)
{
counterReady = false; // time not up yet
timerPeriod = ms; // how many 1 mS counts to do
timerTicks = 0; // reset interrupt counter
overflowCount = 0; // no overflows yet
// reset Timer 1 and Timer 2
TCCR1A = 0;
TCCR1B = 0;
TCCR2A = 0;
TCCR2B = 0;
// Timer 1 - counts events on pin D5
TIMSK1 = bit (TOIE1); // interrupt on Timer 1 overflow
// Timer 2 - gives us our 1 mS counting interval
// 16 MHz clock (62.5 nS per tick) - prescaled by 128
// counter increments every 8 µS.
// So we count 125 of them, giving exactly 1000 µS (1 mS)
TCCR2A = bit (WGM21) ; // CTC mode
OCR2A = 124; // count up to 125 (zero relative!!!!)
// Timer 2 - interrupt on match (ie. every 1 mS)
TIMSK2 = bit (OCIE2A); // enable Timer2 Interrupt
TCNT1 = 0; // Both counters to zero
TCNT2 = 0;
// Reset prescalers
GTCCR = bit (PSRASY); // reset prescaler now
// start Timer 2
TCCR2B = bit (CS20) | bit (CS22) ; // prescaler of 128
// start Timer 1
// External clock source on T1 pin (D5). Clock on rising edge.
TCCR1B = bit (CS10) | bit (CS11) | bit (CS12);
} // end of startCounting
ISR (TIMER1_OVF_vect)
{
++overflowCount; // count number of Counter1 overflows
} // end of TIMER1_OVF_vect
//******************************************************************
// Timer2 Interrupt Service is invoked by hardware Timer 2 every 1ms = 1000 Hz
// 16Mhz / 128 / 125 = 1000 Hz
ISR (TIMER2_COMPA_vect)
{
// grab counter value before it changes any more
unsigned int timer1CounterValue;
timer1CounterValue = TCNT1; // see datasheet, page 117 (accessing 16-bit registers)
unsigned long overflowCopy = overflowCount;
// see if we have reached timing period
if (++timerTicks < timerPeriod)
return; // not yet
// if just missed an overflow
if ((TIFR1 & bit (TOV1)) && timer1CounterValue < 256)
overflowCopy++;
// end of gate time, measurement ready
TCCR1A = 0; // stop timer 1
TCCR1B = 0;
TCCR2A = 0; // stop timer 2
TCCR2B = 0;
TIMSK1 = 0; // disable Timer1 Interrupt
TIMSK2 = 0; // disable Timer2 Interrupt
// calculate total count
timerCounts = (overflowCopy << 16) + timer1CounterValue; // each overflow is 65536 more
counterReady = true; // set global flag for end count period
} // end of TIMER2_COMPA_vect
String inputString = ""; // a string to hold incoming command date
boolean stringComplete = false; // whether the string is complete
void setup ()
{
pinMode(2, OUTPUT); // for signal select on the 74HC153. Using Pins 2 and 3.
pinMode(3, OUTPUT);
Serial.begin(9600);
// reserve 200 bytes for the inputString:
inputString.reserve(200);
// end of setup
}
void loop ()
{
for (int x=0; x < 3; x++){ // Loop thru the 3 signals to count the signals.
if (x==0) { //Select VFO
digitalWrite(2, LOW);
digitalWrite(3, HIGH);
}
if (x==1) { //Select BFO
digitalWrite(2, HIGH);
digitalWrite(3, LOW);
}
if (x==2) { //Select HFO
digitalWrite(2, LOW);
digitalWrite(3, LOW);
}
delay (20); //settle time
// stop Timer 0 interrupts from throwing the count out
byte oldTCCR0A = TCCR0A;
byte oldTCCR0B = TCCR0B;
TCCR0A = 0; // stop timer 0
TCCR0B = 0;
startCounting (100); // how many mS to count for
while (!counterReady)
{ } // loop until count over
// adjust counts by counting interval to give frequency in Hz
float frq = (timerCounts * 1000.0) / timerPeriod;
// Serial.print (" freq: ");
// Serial.print ((unsigned long) frq);
if (x==0)vfo=frq; // load frequency's into vfo, bfo, and hfo.
if (x==1)bfo=frq;
if (x==2)hfo=(frq*8);
#ifdef DEBUG // for debugging and monitoring the results.
Serial.print("VFO: ");
Serial.print (vfo);
Serial.print(" BFO: ");
Serial.print (bfo);
Serial.print(" HFO: ");
Serial.print (hfo);
Serial.print (" FREQ: ");
Serial.println (hfo-(bfo+vfo));
#endif
// restart timer 0
TCCR0A = oldTCCR0A;
TCCR0B = oldTCCR0B;
}
// Check serial port to see if we have a command
if (stringComplete) {
if (inputString == "ID;") { //ID the radio as a "ID007" - Kenwood TS790. There is no TS-520S. ;-)
Serial.print("ID007;");
}
else if (inputString == "FB;"){ // Probably not needed as Commander uses the "IF" command, used for debugging..
Serial.print("FB00014195000;");
}
else if (inputString == "IF;"){
if ((hfo-(bfo+vfo)) > 9000000){ // Used 9Mhz as the cutoff so I could properly format the string with the additiona digit returned above 10Mhz.
Serial.print ("IF000");
Serial.print (hfo-(bfo+vfo));
Serial.print ("000000000000000020000000;"); // The "2" is the mode, above 9Mhz it returns "USB"
}
else
{
Serial.print ("IF0000");
Serial.print (hfo-(bfo+vfo));
Serial.print ("000000000000000010000000;"); // Mode set to 1 for "LSB".
}
}
// clear the string:
inputString = "";
stringComplete = false;
// end of loop
}
}
/*
SerialEvent occurs whenever a new data comes in the
hardware serial RX. This routine is run between each
time loop() runs, so using delay inside loop can delay
response. Multiple bytes of data may be available.
*/
void serialEvent() {
while (Serial.available()) {
// get the new byte:
char inChar = (char)Serial.read();
// add it to the inputString:
inputString += inChar;
// if the incoming character is a newline, set a flag
// so the main loop can do something about it:
if (inChar == ';') { // Look for ";" - this is the Kenwood command terminator.
stringComplete = true;
}
}
}
