Launch Announcement - Ross On Wye 4/5/2024

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David Akerman

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May 2, 2024, 7:05:01 AMMay 2
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I'm planning a launch for this coming Saturday, midday (very ish).

2 trackers on board, "CHEESE" and "CAKE"

CHEESE: LORA Mode 2 434.450MHz 1 packet every 7 seconds

CAKE:  LORA Mode 1 434.350MHz (3 packets) then RTTY 300/N/1 on 434.225MHz (2 packets).

The flight is currently expected to land about 8 miles SW of the launch site; happy days!

Dave

David Akerman

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May 2, 2024, 7:06:10 AMMay 2
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Sorry, typo:


CHEESE: LORA Mode 2 434.450MHz 1 packet every 7 seconds

CAKE:  LORA Mode 1 434.250MHz (3 packets) then RTTY 300/N/1 on 434.225MHz (2 packets).

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John Laidler

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May 2, 2024, 12:01:19 PMMay 2
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Dave,

I've just dusted off my LoRa Gateway, which I haven't used since HabHub was discontinued.  If I update it using the links on your website for the LoRa gateway will it then upload to sondehub amateur?

John
M0WIV

John Laidler

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May 2, 2024, 12:04:05 PMMay 2
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Sorry,

Ignore my last email - I've just checked on Github and I see this change has been done.

Txs

John

On Thu, 2 May 2024 at 12:06, David Akerman <da...@sccs.co.uk> wrote:

Gavig

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May 2, 2024, 4:25:51 PMMay 2
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Hi Dave,

I am just about to order a new pi4 and Lora module hat....im gutted I'm not going to be able to help track your balloons :)

A very newbie question here, but as you are transmitting with two transmitters, does that mean I would have to have two RP4 / lora units running with your software on it? or would it be one hat with two 433 chips installed?

I assume this will appear on amateur.sondehub.org/ for me to follow along with?

for cake, will it be alternating, 3 packets, 2 packets, 3 packets 2 packets..... or just once off?

Kind Regards,

Gavin Gill

Ross G6GVI

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May 3, 2024, 2:44:05 AMMay 3
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You don't need a Pi4 Gavin, I've recently built one using a PiZero (2W) and an Ra02 Lora board:
Pi Zero LoRa Gateway.jpg
Yes, the Gateway program will support two radios, so you could fit a second LoRa board - but you'd need a signal splitter from your antenna feed.

David Akerman

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May 4, 2024, 3:42:11 PMMay 4
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Thanks to all who helped with this.  Sorry about the late launch vs what was advertised, but the ground winds were too strong for launching a rather delicate payload, so we waited almost till the end of the NOTAM'd period as winds were expected to drop by then, which they did.

This was my first launch where I had to call Swanwick ACC for permission.  That didn't go as smoothly as it should but I'm sure it'll be better when they're more used to us HABbers calling.  It didn't help that my permission sheet had the number for the guy who handles the east of the country, not the west!  Also I was asked to call back after launch and again after landing.  Ho hum!  I did all that and even so received a call on my way home, asking if it had landed yet.

I aimed for 6.5m/s ascent to keep the landing to a safe area, and that worked out well with just 1km between prediction and reality.  See pic attached.

Dave

On Thu, 2 May 2024 at 12:05, David Akerman <calt...@gmail.com> wrote:
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Ross G6GVI

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May 4, 2024, 4:18:43 PMMay 4
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Congratulations on a successful flight Dave and thanks for providing a nice set of test signals. 
My new PiZero LoRa Gateway receiver was working well and I even had time to try out Horus GUI for decoding your RTTY (it doesn't have an "8N1" option, but "8N2" seemed to work OK) as well as FLDIGI/HAB Base. Horus has the benefit of uploading the frequency and SNR of each decode. 
I had fun trying to keep up with the RTTY signal as it drifted:
Screenshot 2024-05-04 at 21-15-08 Basic - Dashboards - Grafana.png
(that discontinuity was when I'd gone into the kitchen and it drifted out of my passband!)
The advantage of LoRa's wider bandwidth and AFC was very clear.

Regards from Ross.

Gavin Gill

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May 9, 2024, 4:54:09 PMMay 9
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Interesting!
Thank you.

Oh just spotted uputronics do a pi zero Lora hat as well!

I’m guessing it doesn’t need much compute power then!

Kind Regards,

Gavin Gill



Sent from my iPhone

On 3 May 2024, at 07:44, Ross G6GVI <ross....@gmail.com> wrote:


You don't need a Pi4 Gavin, I've recently built one using a PiZero (2W) and an Ra02 Lora board:
<Pi Zero LoRa Gateway.jpg>
Yes, the Gateway program will support two radios, so you could fit a second LoRa board - but you'd need a signal splitter from your antenna feed.


On Thursday 2 May 2024 at 21:25:51 UTC+1 Gavig wrote:

A very newbie question here, but as you are transmitting with two transmitters, does that mean I would have to have two RP4 / lora units running with your software on it? or would it be one hat with two 433 chips installed?


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<Pi Zero LoRa Gateway.jpg>

Gavin Gill

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May 9, 2024, 4:54:18 PMMay 9
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Is this still happening?

Kind Regards,

Gavin Gill


Sent from my iPhone

On 2 May 2024, at 21:25, Gavig <gav...@gmail.com> wrote:

Hi Dave,

David Akerman

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May 9, 2024, 4:57:08 PMMay 9
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Very little compute power ... the demod is done on the LoRa chip; the Pi is basically there to upload to the Sondehub servers. 

An ESP32 microcontroller could do the same job, easily.  I should get round to doing that. 

Dave

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