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Balloon telemetry channel

 

¿ªÔÆÌåÓý

Hi all

A few years ago I wrote a Python program to decode telemetry transmissions using the QRPLabs protocol. It worked fine, and derived the telemetry channel by looking at the third element of the call sign, and adding 10 if the first element was a 'Q'. That is, a max of 20 channels.


I see from the U4B page that there are now 600 channels. Is the channel still derivable from the telemetry sent, and if so, what is the algorithm, please?

Thanks

Roger

8P6RX


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**
Roger Hill
**
 

Hi Roger?
Since the original telemetry experiments, telemetry now looks at 0, 1 and Q as a leading characters for the telemetry callsign
In addition all wspr rx receivers have to be frequency corrected to accurately reveal 4 separate 40hz wide bands in the 200 hz wide wspr band.
The receiver frequency correction results can be seen here?
There are 3 types of telemetry that can be sent by the U4B , the original ,? a pair of 6 digit numbers? and a string of letters and numbers.
I understand when Hans gets some time, he will publish how it all goes together, but in response to your question I believe the telemetry channel can be derived from just the received spot, it's corrected frequency, and it's timing relationship to the preceding original wspr spot.
Dave VE3KCL
 

Thanks Dave!

Roger

Get
On 1 Jun 2022, at 09:01, VE3KCL <airdry@...> wrote:

Hi Roger?
Since the original telemetry experiments, telemetry now looks at 0, 1 and Q as a leading characters for the telemetry callsign
In addition all wspr rx receivers have to be frequency corrected to accurately reveal 4 separate 40hz wide bands in the 200 hz wide wspr band.
The receiver frequency correction results can be seen here?
There are 3 types of telemetry that can be sent by the U4B , the original ,? a pair of 6 digit numbers? and a string of letters and numbers.
I understand when Hans gets some time, he will publish how it all goes together, but in response to your question I believe the telemetry channel can be derived from just the received spot, it's corrected frequency, and it's timing relationship to the preceding original wspr spot.
Dave VE3KCL

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