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Re: Negative temperature in Celcius

 

It may be due to loss of precision in the arithmetic used by Byon and not round off. It could be both. Without seeing the code employed in converting temp input to ascii for embedding in the aprs packet it is hard to tell. I suggest that there is likely an arithmetic algorithm within the microprocessor that would alleviate this. I could help but I don't have the code.
regards
rich painter


On Tue, Jul 20, 2021 at 8:41 PM Rob Giuliano via <kb8rco=[email protected]> wrote:
So it appears the issue was most likely rounding.? Now that the temperature is "significantly below 0" it is displaying as below zero.

Glad it is working!

Robert Giuliano
KB8RCO



On Tuesday, July 20, 2021, 9:17:23 PM EDT, py5lf_ <py5lf@...> wrote:


Robert
Today morning the temperature reaches negative temperature in Celcius , so my question was answered;

20/07/2021 06:18:02-03:00:?PY5LF-13>APTT4,PP5CRE-15,WIDE1*,WIDE2-1,qAR,PP5APR-10:WX Davis,FTM100DR,5W,GP6,Ext.Temp.:-3C,25F,DGP=OFF

TT4 works very nice !?
Thank you?

Em qua., 30 de jun. de 2021 ¨¤s 01:06, Rob Giuliano via <kb8rco=[email protected]> escreveu:
Wow, what are all those boards in your picture?

As for the negative numbers, that would be a question for Byon.

Going back through the data, the lowest temperature I saw was 30F, which showed as 0C.
In theory, this could be resolution and round off error.? I didn't see any temperatures below 30, which would be 'even more negative'.

Do the telemetry parameters match your current telemetry output?
Aprs.fi shows your telemetry data as:
?? Power Supply???????? PA
?? Solar Panel P.1?????? SP1
?? Solar Panel P.2?????? SP2
? Battery 1????????????????? B1
? Battery 2????????????????? B2

data with path elements removed???????????????????? PA, SP1,SP2,B1,B2 ,digital
2021-06-29 21:34:13 EDT: >APTT4:T#059,124,000,000,128,127,00000000
2021-06-29 21:38:06 EDT: >APTT4!2529.15S/04913.13WrWX?Davis,FTM100DR,5W,GP6,Ext.Temp.:3C,37F,DGP=OFF
2021-06-29 21:38:30 EDT: >APTT4@.../04913.13W_079/009g015t040r000p018P004h70b10207.DsVP

Just as an experiment, you can try the following settings for telemetry:
??? TELREAD FALSE???????? This will send raw bit values from Analog to digital converter
??? TELHIRES TRUE ? ????? This will? scale the voltage to 0 - 5V will be 0 to 999 counts
??? TELVOLT TRUE??????????? PA will remain TT4 input voltage
??? TELTEMP TRUE?????????? SP1 will be the raw bit value for the temperature sensor
????????????????????????????????????????? The other values will shift right and you will no longer read B2
The millivolt reading is in deg K (x10).
So if the analog to digital converter reads about 500, that will be about 2.5V (2500mV)
? to equate to 250 K or (250 - 273.15)? = -23.15 C.
Taking a step closer to your value:? 539 / 999 * 5 = 2702? or 270.2 K
?? 270.2 - 273.15 => -2.88 C

Then you could verify the output of the status message vs the telemetry data and see if it really is negative, or just rounding off poorly.

Robert Giuliano
KB8RCO



On Tuesday, June 29, 2021, 8:05:52 PM EDT, py5lf_ <py5lf@...> wrote:


<Snip>
Robert
LM335DZ encapsulated?to put outside ...


Livre de v¨ªrus. .

Em ter., 29 de jun. de 2021 ¨¤s 20:50, py5lf_ via <py5lf=[email protected]> escreveu:
Robert
This temperature comes from the LM335DZ put outside my shack , using a shielded cable .
Also I have a Davis Vantage Vue connected to this TT4.
But the main point is this ; TT4 doesn't?show a negative value on Celsius . After reaching zero , the value stays the same , while the temperature in Fahrenheit still works correctly. t^and T^ come from LM335.?

Livre de v¨ªrus. .

Em ter., 29 de jun. de 2021 ¨¤s 15:20, Rob Giuliano via <kb8rco=[email protected]> escreveu:
Are you sending the temperature from a Davis Weather Station, the Temp sensor on the TT4, or a Temp sensor on a different TT4 analog input?? (assume not the last as it wouldn't be converted to degrees inside the TT4)

Robert Giuliano
KB8RCO



On Tuesday, June 29, 2021, 9:44:18 AM EDT, py5lf_ <py5lf@...> wrote:


Friends
As you can see TT4 cant send temperatures below zero in Celsius;
2021-06-29 06:29:04 -03:?>APTT4,WIDE1-1,WIDE2-1,qAR,:WX?Davis,FTM100DR,5W,GP6,Ext.Temp.:0C,30F,DGP=OFF?
30F = -1C
Any solution ?
--
PY5LF?
Luciano Fabricio


Livre de v¨ªrus. .



--
PY5LF?
Luciano Fabricio



--
PY5LF?
Luciano Fabricio



--
PY5LF?
Luciano Fabricio



--
Richard A. Painter, P.E. Retired



Re: Negative temperature in Celcius

 

So it appears the issue was most likely rounding.? Now that the temperature is "significantly below 0" it is displaying as below zero.

Glad it is working!

Robert Giuliano
KB8RCO



On Tuesday, July 20, 2021, 9:17:23 PM EDT, py5lf_ <py5lf@...> wrote:


Robert
Today morning the temperature reaches negative temperature in Celcius , so my question was answered;

20/07/2021 06:18:02-03:00:?PY5LF-13>APTT4,PP5CRE-15,WIDE1*,WIDE2-1,qAR,PP5APR-10:WX Davis,FTM100DR,5W,GP6,Ext.Temp.:-3C,25F,DGP=OFF

TT4 works very nice !?
Thank you?

Em qua., 30 de jun. de 2021 ¨¤s 01:06, Rob Giuliano via <kb8rco=[email protected]> escreveu:

Wow, what are all those boards in your picture?

As for the negative numbers, that would be a question for Byon.

Going back through the data, the lowest temperature I saw was 30F, which showed as 0C.
In theory, this could be resolution and round off error.? I didn't see any temperatures below 30, which would be 'even more negative'.

Do the telemetry parameters match your current telemetry output?
Aprs.fi shows your telemetry data as:
?? Power Supply???????? PA
?? Solar Panel P.1?????? SP1
?? Solar Panel P.2?????? SP2
? Battery 1????????????????? B1
? Battery 2????????????????? B2

data with path elements removed???????????????????? PA, SP1,SP2,B1,B2 ,digital
2021-06-29 21:34:13 EDT: >APTT4:T#059,124,000,000,128,127,00000000
2021-06-29 21:38:06 EDT: >APTT4!2529.15S/04913.13WrWX?Davis,FTM100DR,5W,GP6,Ext.Temp.:3C,37F,DGP=OFF
2021-06-29 21:38:30 EDT: >APTT4@.../04913.13W_079/009g015t040r000p018P004h70b10207.DsVP

Just as an experiment, you can try the following settings for telemetry:
??? TELREAD FALSE???????? This will send raw bit values from Analog to digital converter
??? TELHIRES TRUE ? ????? This will? scale the voltage to 0 - 5V will be 0 to 999 counts
??? TELVOLT TRUE??????????? PA will remain TT4 input voltage
??? TELTEMP TRUE?????????? SP1 will be the raw bit value for the temperature sensor
????????????????????????????????????????? The other values will shift right and you will no longer read B2
The millivolt reading is in deg K (x10).
So if the analog to digital converter reads about 500, that will be about 2.5V (2500mV)
? to equate to 250 K or (250 - 273.15)? = -23.15 C.
Taking a step closer to your value:? 539 / 999 * 5 = 2702? or 270.2 K
?? 270.2 - 273.15 => -2.88 C

Then you could verify the output of the status message vs the telemetry data and see if it really is negative, or just rounding off poorly.

Robert Giuliano
KB8RCO



On Tuesday, June 29, 2021, 8:05:52 PM EDT, py5lf_ <py5lf@...> wrote:


<Snip>
Robert
LM335DZ encapsulated?to put outside ...


Livre de v¨ªrus. .

Em ter., 29 de jun. de 2021 ¨¤s 20:50, py5lf_ via <py5lf=[email protected]> escreveu:
Robert
This temperature comes from the LM335DZ put outside my shack , using a shielded cable .
Also I have a Davis Vantage Vue connected to this TT4.
But the main point is this ; TT4 doesn't?show a negative value on Celsius . After reaching zero , the value stays the same , while the temperature in Fahrenheit still works correctly. t^and T^ come from LM335.?

Livre de v¨ªrus. .

Em ter., 29 de jun. de 2021 ¨¤s 15:20, Rob Giuliano via <kb8rco=[email protected]> escreveu:
Are you sending the temperature from a Davis Weather Station, the Temp sensor on the TT4, or a Temp sensor on a different TT4 analog input?? (assume not the last as it wouldn't be converted to degrees inside the TT4)

Robert Giuliano
KB8RCO



On Tuesday, June 29, 2021, 9:44:18 AM EDT, py5lf_ <py5lf@...> wrote:


Friends
As you can see TT4 cant send temperatures below zero in Celsius;
2021-06-29 06:29:04 -03:?>APTT4,WIDE1-1,WIDE2-1,qAR,:WX?Davis,FTM100DR,5W,GP6,Ext.Temp.:0C,30F,DGP=OFF?
30F = -1C
Any solution ?
--
PY5LF?
Luciano Fabricio


Livre de v¨ªrus. .



--
PY5LF?
Luciano Fabricio



--
PY5LF?
Luciano Fabricio



--
PY5LF?
Luciano Fabricio


Re: Negative temperature in Celcius

 

Robert
Today morning the temperature reaches negative temperature in Celcius , so my question was answered;

20/07/2021 06:18:02-03:00:?PY5LF-13>APTT4,PP5CRE-15,WIDE1*,WIDE2-1,qAR,PP5APR-10:WX Davis,FTM100DR,5W,GP6,Ext.Temp.:-3C,25F,DGP=OFF

TT4 works very nice !?
Thank you?

Em qua., 30 de jun. de 2021 ¨¤s 01:06, Rob Giuliano via <kb8rco=[email protected]> escreveu:

Wow, what are all those boards in your picture?

As for the negative numbers, that would be a question for Byon.

Going back through the data, the lowest temperature I saw was 30F, which showed as 0C.
In theory, this could be resolution and round off error.? I didn't see any temperatures below 30, which would be 'even more negative'.

Do the telemetry parameters match your current telemetry output?
Aprs.fi shows your telemetry data as:
?? Power Supply???????? PA
?? Solar Panel P.1?????? SP1
?? Solar Panel P.2?????? SP2
? Battery 1????????????????? B1
? Battery 2????????????????? B2

data with path elements removed???????????????????? PA, SP1,SP2,B1,B2 ,digital
2021-06-29 21:34:13 EDT: >APTT4:T#059,124,000,000,128,127,00000000
2021-06-29 21:38:06 EDT: >APTT4!2529.15S/04913.13WrWX?Davis,FTM100DR,5W,GP6,Ext.Temp.:3C,37F,DGP=OFF
2021-06-29 21:38:30 EDT: >APTT4@.../04913.13W_079/009g015t040r000p018P004h70b10207.DsVP

Just as an experiment, you can try the following settings for telemetry:
??? TELREAD FALSE???????? This will send raw bit values from Analog to digital converter
??? TELHIRES TRUE ? ????? This will? scale the voltage to 0 - 5V will be 0 to 999 counts
??? TELVOLT TRUE??????????? PA will remain TT4 input voltage
??? TELTEMP TRUE?????????? SP1 will be the raw bit value for the temperature sensor
????????????????????????????????????????? The other values will shift right and you will no longer read B2
The millivolt reading is in deg K (x10).
So if the analog to digital converter reads about 500, that will be about 2.5V (2500mV)
? to equate to 250 K or (250 - 273.15)? = -23.15 C.
Taking a step closer to your value:? 539 / 999 * 5 = 2702? or 270.2 K
?? 270.2 - 273.15 => -2.88 C

Then you could verify the output of the status message vs the telemetry data and see if it really is negative, or just rounding off poorly.

Robert Giuliano
KB8RCO



On Tuesday, June 29, 2021, 8:05:52 PM EDT, py5lf_ <py5lf@...> wrote:


<Snip>
Robert
LM335DZ encapsulated?to put outside ...


Livre de v¨ªrus. .

Em ter., 29 de jun. de 2021 ¨¤s 20:50, py5lf_ via <py5lf=[email protected]> escreveu:
Robert
This temperature comes from the LM335DZ put outside my shack , using a shielded cable .
Also I have a Davis Vantage Vue connected to this TT4.
But the main point is this ; TT4 doesn't?show a negative value on Celsius . After reaching zero , the value stays the same , while the temperature in Fahrenheit still works correctly. t^and T^ come from LM335.?

Livre de v¨ªrus. .

Em ter., 29 de jun. de 2021 ¨¤s 15:20, Rob Giuliano via <kb8rco=[email protected]> escreveu:
Are you sending the temperature from a Davis Weather Station, the Temp sensor on the TT4, or a Temp sensor on a different TT4 analog input?? (assume not the last as it wouldn't be converted to degrees inside the TT4)

Robert Giuliano
KB8RCO



On Tuesday, June 29, 2021, 9:44:18 AM EDT, py5lf_ <py5lf@...> wrote:


Friends
As you can see TT4 cant send temperatures below zero in Celsius;
2021-06-29 06:29:04 -03:?>APTT4,WIDE1-1,WIDE2-1,qAR,:WX?Davis,FTM100DR,5W,GP6,Ext.Temp.:0C,30F,DGP=OFF?
30F = -1C
Any solution ?
--
PY5LF?
Luciano Fabricio


Livre de v¨ªrus. .



--
PY5LF?
Luciano Fabricio



--
PY5LF?
Luciano Fabricio



--
PY5LF?
Luciano Fabricio


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

Brian,

Well, we do our best not to send out units that are bad right out of production :) I look forward to getting your unit and I will make sure it is ship-shape and Bristol fashion.?

73,

Allen

On Sat, Jul 17, 2021 at 5:15 PM <toy4trax@...> wrote:
Allen,
Very much appreciate your offer. I'll get it out to you next week!

The odds that the issue is my fault is much higher, than it being a lemon. I did my due diligence at each step to prevent magic smoke, so I definitely appreciate an expert taking a look.

-Brian
KG7KHL


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

Allen,
Very much appreciate your offer. I'll get it out to you next week!

The odds that the issue is my fault is much higher, than it being a lemon. I did my due diligence at each step to prevent magic smoke, so I definitely appreciate an expert taking a look.

-Brian
KG7KHL


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

The amplifier is the black widget mounted to the board with screws, above the metal can. ( The RF module)? Other than a really awful short circuit of some kind, it's unlikely the 2.5mm serial port jack could prevent the unit from powering up. I suggest you send me your MTT4BT, power/serial cable. and USB-2.5 cable, and I will check everything out and do my best to make them run according to Hoyle! My shipping address is:

VHS
1370 Trancas?Street, Suite 201
Napa, CA 94558

73,

Allen


-----Original Message-----
From: toy4trax@...
To: [email protected]
Sent: Sat, Jul 17, 2021 3:00 pm
Subject: Re: [TinyTrak] MTT4BT- Will not power with USB 2.5 Cable plugged in.

Allen,
???? Thanks. I have been using the V3 "Hershey Kiss" antenna that Byonics sells: Nagoya UT-108UV.

The antenna is placed on a piece of sheet metal for ground plane.

Have not touched the blue potentiometers inside either.

Any reason this would impact the unit not powering up when the 2.5mm connector is plugged in/connected to the computer?

Honestly I'm feeling like I got a bum unit here. All power sources have been fused, no fooling around in the programming, ect.

For the test, I assume the amplifier is the silver rectangle on the right-hand side in my pic below?


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

Allen,
???? Thanks. I have been using the V3 "Hershey Kiss" antenna that Byonics sells: Nagoya UT-108UV.

The antenna is placed on a piece of sheet metal for ground plane.

Have not touched the blue potentiometers inside either.

Any reason this would impact the unit not powering up when the 2.5mm connector is plugged in/connected to the computer?

Honestly I'm feeling like I got a bum unit here. All power sources have been fused, no fooling around in the programming, ect.

For the test, I assume the amplifier is the silver rectangle on the right-hand side in my pic below?


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

If D6 is blown out, you won't have any power to the amplifier circuit, including the T/R relay. The diode is rated for a surge rating of 9 Amperes. You can check the circuit by measuring the DC input on the amplifier module, third pin from the left. If the diode is blown, the mostly likely thing is that the amplifier was locked into the transmit-mode. This can happen because of a high SWR ( You MUST use a good antenna...not a rubber duck, etc or turn the power way down or off using the blue trimmer potentiometer, or by operating into a dummy load) or by intentionally causing an extended transmission via a command?line instruction.(CALIBRATE) D6 protect the amplifier?stage, but the low voltage?stage can remain functional with the power out to the final amplifier.?

73,

Allen AF6OF

On Sat, Jul 17, 2021 at 11:11 AM Rob Giuliano via <kb8rco=[email protected]> wrote:
D6 is the main input to the RF amplifier.

Robert Giuliano
KB8RCO



On Saturday, July 17, 2021, 1:30:10 PM EDT, toy4trax@... <toy4trax@...> wrote:


Yes, second interface to the computer with the 2.5mm jack.
Yes, Jumpers set j4,j5 top jumpered.?

MiniDin-
  • Cable side- Ground at 5 but not 6.
  • Board side- The bottom two have continuity (yellow arrows in pic)



Looking at the board deeper the component at D6(left side under DIN connector) looks cooked?


How? Why?



?


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

D6 is the main input to the RF amplifier.

Robert Giuliano
KB8RCO



On Saturday, July 17, 2021, 1:30:10 PM EDT, toy4trax@... <toy4trax@...> wrote:


Yes, second interface to the computer with the 2.5mm jack.
Yes, Jumpers set j4,j5 top jumpered.?

MiniDin-
  • Cable side- Ground at 5 but not 6.
  • Board side- The bottom two have continuity (yellow arrows in pic)



Looking at the board deeper the component at D6(left side under DIN connector) looks cooked?


How? Why?



?


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

  • Yes, second interface to the computer with the 2.5mm jack.
    Yes, Jumpers set j4,j5 top jumpered.?

    MiniDin-
  • Cable side- Ground at 5 but not 6.
  • Board side- The bottom two have continuity (yellow arrows in pic)



Looking at the board deeper the component at D6(left side under DIN connector) looks cooked?


How? Why?



?


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

When you say second one down, are you referring to the page, or the second computer interface with 2.5mm jack?

I think you are using the 2.5mm Jack, which is the same as the BT module.?
Are you changing the jumpers to disable the Bluetooth?
The module has 3 possible configurations:
??? PortA using 2.5mm jack?????????? (J4 & J5 top jumpered)
??? PortA for BT commincation????? (J4 bottom & J6 top jumpered)
??? PortA disabled and 2.5mm jack is fro configuring the BT module (J5, J6 bottom & J7 horizontal jumpered)

Does the MiniDIN use both 5 & 6 pins for ground to the DE9?

Robert Giuliano
KB8RCO



On Saturday, July 17, 2021, 1:42:00 AM EDT, toy4trax@... <toy4trax@...> wrote:


It is the cable from Byonics, second one down:


Has the MiniDIN and PortB as you described.
PortA uses the 2.5mm jack, PortB is the MiniDin split to DB-9 and Power provided with the MTT4BT

Cables are from Byonics.


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

It is the cable from Byonics, second one down:


Has the MiniDIN and PortB as you described.
PortA uses the 2.5mm jack, PortB is the MiniDin split to DB-9 and Power provided with the MTT4BT

Cables are from Byonics.


Re: MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

What is a USB 2.5 cable??
Are you referring to the 2.5mm jack for PortA?

Sounds like a wiring issue - possibly ground.

I am not familiar with the MTT4BT.? I have the MTT4B that I added my own Bluetooth module to.
The MTT4B has 2 ports:
? MiniDIN with 6-pins (PS2 keyboard style) => PortB with RF module power and 5V out for GPS.
? TRS style 2.5 mm jack.

What cables are you using?
? Home made, or Byonics purchased?

Robert Giuliano
KB8RCO



On Friday, July 16, 2021, 8:23:28 PM EDT, <toy4trax@...> wrote:


I had everything working on the bench, went to install on the vehicle and now not....

Back to the bench- MTT4BT will not power up if the USB 2.5 cable is plugged in to either the A port, or USB port.
MTT4BT is being powered from the DB9 cable(not the pins themselves) just the 12v leads.
Verified i'm getting 12v at the source.
Powers up just fine if the USB cable is unplugged from the MTT4BT
Powers up just fine if the USB cable is unplugged from the computer.

Lights-
Boot sequence is good.
Red light stays on
When packet is received, I can hear a relay click, lights indicate normal operation, and digi.

Can't get into programming mode at all now...

What to do?

-Brian


MTT4BT- Will not power with USB 2.5 Cable plugged in.

 

MTT4BT will not boot up if the USB 2.5 cable is plugged in. If i unplug from computer. It boots up immediately. If i unplug from the MTT4BT, it also boots immediately.

Everything was working fine this morning, now not.


Re: MTT4BT and Mobilinkd3

 

Ah, yes of course you are correct. I was thinking TNC to TNC no big deal, but duh.?

?


Re: MTT4BT and Mobilinkd3

 

I believe the issue is with Apple not supporting any Bluetooth before 4.0 (LE).
The MTT4BT iused a HC-05 Bluetooth 2.0 module which is not Bluetooth LE compliant.


The MobilinkD is a TNC.?
TNCs expect audio in from a radio for decode and serial data out to a computer.


The MTT4BT is a radio with built in TNC.?
So the Audio in for decode is hidden inside the radio circuitry.
The output is serial data to a computer.
In order to use the MobiLinkD with the MTT4BT, you would have to add an audio jack and bypass the internal TNC.
? To do this, you would have to make connections to U8.

It would make more sense to connect the MobiLink to a radio if you want to use your Apple device over Bluetooth.

Robert Giuliano
KB8RCO



On Friday, July 16, 2021, 3:55:54 PM EDT, toy4trax@... <toy4trax@...> wrote:


I'd like to link these two systems together. Why- well as an iOS user, Apple doesn't like anybody, but MobilinkD has figured out how to connect the APRS.FI app to their product over Bluetooth. So what I'm thinking is that I could use port A as a KISS TNC over to the MobilinkD, which would make the connection to my phone and provide an iGate, and messaging interface.

Anybody traveled this road yet?

I guess the first step- what cable to use...

The MobilinkD:
TRRS ¨C 3.5mm TRRS audio connector for Radio.
1.Tip = Speaker (audio input to TNC)
2.Ring 1 = PTT (Simplex PTT mode)
3.Ring 2 = Mic (and PTT in Multiplexed PTT mode)
4.Sleeve = GND/Commo


Don't know why, but the schematic in the PDF is very blurry and unreadable.

Is the MTT4BT just a TRRS or something other?

Thanks


-Brian
KG7KHL


MTT4BT and Mobilinkd3

 

I'd like to link these two systems together. Why- well as an iOS user, Apple doesn't like anybody, but MobilinkD has figured out how to connect the APRS.FI app to their product over Bluetooth. So what I'm thinking is that I could use port A as a KISS TNC over to the MobilinkD, which would make the connection to my phone and provide an iGate, and messaging interface.

Anybody traveled this road yet?

I guess the first step- what cable to use...

The MobilinkD:
TRRS ¨C 3.5mm TRRS audio connector for Radio.
1.Tip = Speaker (audio input to TNC)
2.Ring 1 = PTT (Simplex PTT mode)
3.Ring 2 = Mic (and PTT in Multiplexed PTT mode)
4.Sleeve = GND/Commo


Don't know why, but the schematic in the PDF is very blurry and unreadable.

Is the MTT4BT just a TRRS or something other?

Thanks


-Brian
KG7KHL


Re: MTT4BT and Garmin Montana APRS

 

Created a Facebook group based on this success if anybody is interested.

Experts welcome!

.

Like it or not, Facebook is where the next generation of the hobby is likely to discover it.

-
KG7KHL


Re: MTT4BT and Garmin Montana APRS

 

Thanks, Rob that fixed it. Could have sworn i changed the baud rate before, but guess not.

Well I can officially confirm that the Montana 700 series will work in the APMS mount!

GPS Settings

  • Interface: NMEA In/Out
  • NMEA Sentences:
    • GSA, GSV On,
    • WPL RTE On
    • GRMN Proprietary On
  • Waypoint IDs
    • Names
  • Baud
    • 4800
  • Autopilot Mode
    • Off





This combination did NOT work:
Garmin Serial Data / Power Cable Garmin part number: 010-11131-01. 5 pin cable(un-verified function)https://www.amazon.com/gp/product/B07RD9ZW4H/ref=ox_sc_act_title_2?smid=A3GSDEVWHJ30D5&psc=1
Not sure if it is the Garmin cable, or the adapter. I did read elsewhere, that the adapter needs to be a true 5 pin connection and the amazon item may not be even though it says it is...


One thing that would be helpful concerning the waypoints being sent to the GPS- If they came over with no symbol or a single symbol, it would be easy to sort the list.


Thanks again for the help!


Re: MTT4BT and Garmin Montana APRS

 

First setting would be to set BBAUD to the GPS rate so the MTT4BT can communicate with the GPS.
The specific settings for waypoints are:
??? GWAYLEN 9
??? GWAYMODE NMEA
??? TSWPT TRUE
????WYPTXT is FALSE
The last one (WYPTXT) can be set true to monitor what is sent to the GPS in PuTTY.

Red needs to be changed.? Green are just highlighting the settings reated to your question.

Robert Giuliano
KB8RCO



On Thursday, July 15, 2021, 8:02:03 PM EDT, toy4trax@... <toy4trax@...> wrote:


Ok, received the MTT4BT!

Programming using PUTTY up and running.

What settings to change to attempt to utilize the Garmin as the GPS?

"It can also send received station position reports back to the GPS to be displayed as waypoints using
the $GPWPL & $PGRMW sentences. GPS received known the support this format include Garmin
GPSMAP 276C & GPSMAP 60CSx, Garmin GPS 12Map, Garmin eTrex Legend and eTrex Vista,
and the AvMap G5."

:DISPLAY
BANK is 0
P300 is FALSE
TXTDISP is FALSE
NODISP is FALSE
PPATHING is FALSE
DMSDISP is FALSE
MICETMV is FALSE
ENTS is FALSE
TELHIRES is FALSE
TELVOLT is TRUE
TELTEMP is TRUE
PREEMPT is FALSE
DIGIID is FALSE
WXPOS is TRUE
TELREAD is TRUE
FRAWDISP is FALSE
HRAWDISP is FALSE
WYPTXT is FALSE
PKTICOM is TRUE
PKTOCOM is FALSE
RPATHDISP is FALSE
LEDS is TRUE
PAVPEN is FALSE
DEC96 is FALSE
DDIST is FALSE
HEADERLN is FALSE
DMETRIC is FALSE
SOFTRST is TRUE
MSGCMD is FALSE
MSGCAP is FALSE
LRNTPS is FALSE
GPSCHK is FALSE
INTCLK is FALSE
DECSTAT is FALSE
DIGIMY is FALSE
HIPWR is FALSE
TOSV is TRUE
TALT is TRUE
TSPEED is TRUE
TIMESTAMP is TRUE
TIMEHMS is FALSE
SBEN is TRUE
TSWPT is TRUE
AMODE is TEXT
BMODE is GPS
ABAUD is 19200
BBAUD is 000
BNKMODE is 0
SSIDROUTE is 0
ALTNET is APTT4
MYCALL is KG7KHL-13
PATH1 is ISWIDE-11
PATH2 is WIDE2-1
PATH3 is
TSTAT is /TinyTrak4 Alpha
BTEXT is >/TinyTrak4 Alpha
BPERIOD is 0
TXD is 40
MTXD is 10
PERSIST is 65
SLOTTIME is 15
QUIET is 10
TRNKMODE is 0
CDMODE is INVERTED_PIN2
CDLEVEL is 80
TXLEVEL is 128
TXTWIST is 50
RXAMP is 5
GWAYLEN is 9
GWAYMODE is NMEA
GRELAYBITS is 1
GRELAYRATE is 0
GKRELAY is 0
LOCATION is 1234.5678N 12345.6789W
GALT is 1000
TSYMCODE is >
TSYMTABLE is /
STATUSRATE is 1
PPERIOD is 120
MPPERIOD is 0
SBSSPEED is 5
SBFSPEED is 60
SBSPERIOD is 1800
SBFPERIOD is 90
SBTANGLE is 27
SBTSLOPE is 0
SBTTIME is 5
MMSG is 0
TSOFFSET is 17
TDAO is 0
TPROTOCOL is MIC-E
TPSWITCH is 0
TPERIOD is 0
TVOLTTWK is 128
TTEMPTWK is 128
WPERIOD is 0
ALIAS1 is WIDE
ALIAS2 is IS
ALIAS3 is
DUPETIME is 30
FILTERCALL is
TXFREQ is 144.390
RXFREQ is 144.390
RXSQUELCH is 0
RXMODE is 0