ok Tnx Bob

Question how to set Chanel in source code?

? call_telemetry[0] = 'X'; // telemetry channel 15
? call_telemetry[2] = 'X';

tnx Jan

On Mon, May 18, 2020 at 8:45 PM Bob Sutton via <zl1rs=[email protected]> wrote:

Hallo gentleman.
The "telemetry channel" is the 1st and 3rd charachter we use in the "telemetry spot".
As you know, the lelemetry spot is similar to a normal spot (callsign, locator, dBm) but all of these info are "fake".
So, a "fake" callsign may be any callsign the coding firmware would create but, since we have the need to find it in the "spot sea" between all other billions of spots, we need to search only some callsign.
So, firmware chooses 1st and 3rd characher you set up as "channel". If you choose Q and 0, all your telemetry spots will be like Qx0yzk, where only x, y, z and k may change, but Q and 0 are fixed.
So, you can be sure that is your spot.
Of course, we hope no more than one ham radio amateur launcher uses that channel, otherwise may be an interference in decoding telemetry spots.
Now we can choose only callsign beginning with 0 (zero) and Q, because there are no ham radio callsign assigned by authorities around the world that begins with these two charachters.
Hope this helps.
73 de IZ7VHF, Roberto, southern Italy.

I prefer the upper edge of wspr bandpass, I have my trackes set at 14097185, the thought is that its less traffic toward the edges (upper/lower) of the bandpass and our low power signals have a better chance to get through there, when I used jt9 I set just outside wspr bandpass at around 14097280, that way I could decode them both with one radio. same scenario goes with 30m

No, not realy, there is some if you google but I had not much use of them when I made mine but its realy easy, basically just get a XXL mouse pad, largest you can find, a marker pen?and a pieze of string like this?
? (no pin ofc)

for the balloon inlet I used 2 round plates on a cardboard piece to make a templet and cut it out, see pic.

then just a long ruler or some long cardboard pice and "connect" the two rounded halfs marks with the pen

Thats basicly it, set the iron on two dots 140-150° wool seting and start ironing away along the mark, use some pressure and just not the weight of the iron.

I use a XXL?mouse?pad, have that under the film when you heatseal it, it will make the seams realy nice and even, also best to mension, I have some baking paper between the film and iron.

/Mikael

I know a lot of people use these?balloons:

?

If you are new to aliexpresss you can get a coupon for couple dollars off.?

Aaron. M7REG

On Sun, 29 Mar 2020, 18:19 Ken Daniel via Groups.Io, <kenndaniel=[email protected]> wrote:

I understand that you can get nice balloons from SBS, but I am looking for the best inexpensive alternative.
What is the exact balloon on Alliexpress that is the best one to use for a pico balloon?
If you use an aluminum coated balloon which is the best?

Thanks?
Ken

I understand that you can get nice balloons from SBS, but I am looking for the best inexpensive alternative.
What is the exact balloon on Alliexpress that is the best one to use for a pico balloon?
If you use an aluminum coated balloon which is the best?

Thanks?
Ken

Does anyone have a link to the correct balloons on Alliexpress?

Thanks
Ken

Hi Paul,

Here's a working example, in an online C language IDE, where you can substitute in some test values of lat and lon and see if the calculations are correct.



It appears to me that this code is designed for full decimal values of the GPS coordinates, not a DMS format such as ddmm.ssss.

I also changed the initial values of MH[4]/MH[5] to be 'a' instead of 'A' since I've seen that the third subdivision normally designated with lower case characters.

Where is this original code from?

Thanks,

Dave