[amsat-bb] XW-2D Returns to Life!

[Zach Metzinger]

On 2020-03-05 13:00, Hasan al-Basri wrote:
> Since we were speaking of SSB SNR, the bandwidth would be similar. In 
> our cases we use 2.2 kHz. I forgot to even mention it.
> 
> The ...and the point of the whole process was to keep it simple. The 
> more precise, the more complex and the less likely anyone is going to 
> bother.

Hello Hasan,

I definitely applaud your efforts to measure relative system 
performance, but I did want to make it clear to others on the list that 
there was another factor which needed to be taken into account when 
doing an apples-to-apples. This additional factor isn't too hard, when 
you understand why it matters.

> Boltzman is not needed for that. We aren't doing EME. Sat ops are a 
> relatively strong signal mode. It says a lot that many receive setups 
> are performing so poorly that "rough and dirty"  (and simple) approaches 
> like I outlined can make a big difference in overall efficiency. I just 
> hope that it helps people hear better.
> (and subsequently reduce their uplink power)

I also completely agree with you on the need for fewer alligators on the 
satellites. With GOLF, where we're building bigger vehicles with larger 
orbits and footprints, excessive uplink power becomes an even bigger 
issue for more simultaneous users.

That said, GOLF satellites will also incur more path loss, so getting 
LEO operators more familiar with the "down in the noise" issues will 
make for better MEO/HEO operators, too.

Keep up the good work! I enjoyed your video.

73,

--- Zach
N0ZGO