Here is a project that I have been working on and off for a few years. I have flown it 5 times. It hasn't made it around the world yet. I have three more ready to go up soon. I will put the

The newest version of JTEncode is significantly larger so my Atmega 328P code would no longer fit. I needed to downgrade to v 1.21. The newer version is a more complete implementation of the wspr

Big thanks for the answers. The problem resolved itself, apparently it is related to libraries. I started it on another computer and everything went well.

You can also use this on other arduino comparable boards, Esp32, teensy etc. they all have larger memories and more horsepower. If you want to reduce the size you’ll likely have to eliminate some of

Here are a few general tips for reducing code size. https://oscarliang.com/arduino-sketch-too-big-error-reduce-sketch-size/ -- ====================== Brian McClure Amateur Radio:

I'm not an active contributor on this group but it would probably be useful if you posted a description of what the sketch does and a source listing of the sketch. Someone might spot a way to reduce

Hello. I apologize for the stupid question, i need to somehow reduce the size of the sketch so that it fits on Atmega 328P? The sketch uses 33776 byte (109%) of memory.

Just wanted to say hello to everyone and ask a question. I am just now getting into Pico Ballooning and want to build my own tracker w/WISPr Is there anywhere on the web that shows how to build a Pico

Thanks for responding Ken. I'll look more closely at my setup and see if I need to adjust transmit frequency to be in band.

I heard a program on NPR yesterday about a bunch of scientists using trackers on birds. He said they use a store and forward method using a cell fone chip to dump a days worth of data in a text

Hi Mikael, I have a lot of experience using Si5351 on a breadboard using Adafruit and Amazon types. Even though the frequency of the crystal and transmit frequency is set correctly the signal is

Hi Mikael, I have a lot of experience using Si5351 on a breadboard using Adafruit and Amazon versions. I even though the frequency of the crystal and transmit frequency is set correctly the signal

Hello Jeff. About the TX frequency, you must set it somewhere between 14097000 and 14097200, in these 200 Hz bandwidth reserved for WSPR transmissions. The one who could mislead you is the so-called

Hi, its always hard do say what to do just seeing some pictures but I notice two things, first it looks to me you have to set the correct wspr freq, 14095600 is the dial freq, the transmitted signal

Hi Harry, Thank you for your time and response. It seems that my signal wasn't at a WSPR frequency, but rather at 14MHz. I failed to change WSPR_FREQ in the HABalloon code. Once updated it appears

Hi Mikael, Thanks for your time. I think the xo speed was a good hint. I'm doing a mock-up using the Adafruit SI5351 breakout board. The board has a 25MHz TXCO, but I noticed that the HABalloon

Hi Jeff. The first screenshot shows some signals between 3100 and 3500Hz but the WSPR reception only works if they are between 1400 and 1600Hz so perhaps you are not correctly tuned? The traces also

Hi, it looks like you are listening in on the 10th overtone or something, thats usually what it looks like then, also its way out of wspr band pass but that will probably sort when you get it going

To Whom It may Interest: I am working on a high altitude balloon tracking project using the firmware of this project. The mock-up of the circuitry includes the Arduino/SI5351 with a uBlox GPS

It will work fine with vcc on pin 7 of the atgm, and I would recommend you put vcc on pin V_bat pin 6 of the atgm but it will work fine without. /Mikael