6200MM Saving Image Download Speeds

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rreed
Posts: 25
Joined: Fri Mar 18, 2016 7:40 pm

6200MM Saving Image Download Speeds

Post by rreed » Sat Aug 01, 2020 3:02 pm

I have an ethernet cable going from my ASIAir Pro to a wireless extender using my wireless network's 2.4 Ghz channel. With my 2600 camera it takes only 5 secs to save an unbinned image to the Air's microSD card when I connect to the 2.4 Ghz channel with my iPad. Which is great!

Now I'm considering purchasing the 6200MM camera and am wondering how long it will take to save an unbinned image. What kind of download times (save to microSD card) are people getting with this camera? Thanks! Rick

W7AY
Posts: 236
Joined: Fri Jan 25, 2019 3:38 am
Location: Portland, Oregon, USA

Re: 6200MM Saving Image Download Speeds

Post by W7AY » Sat Aug 01, 2020 6:52 pm

2.4 GHz WiFI limits your downloads to 300 Mbits/sec.

An AC750-class (for example, the TP-Link Travel Router) extender has a limit of 433 Mb/sec transfer speed on 5 GHz, so it is only marginally faster than using 2.4 GHz.

For higher speeds, you need faster routers e.g., the AC1200,- and AC1500- class routers. Many of them will run off 12V supply.

Be mindful that the Raspberry Pi 4 (ASIAIR Pro) Ethernet port is itself limited to about 950 Mb/sec (barely qualifying as Gigabit), so while an AC1200-class (about 900 Mbps on 5 GHz) will help, you probably won't see much further improvement with AC1500 and higher classes. On top of that, depending on ZWO's implementation, you may not achieve the 950 Mbps LAN performance.

For ultimate speeds, you can convert your house network to something like an eero (now owned by Amazon) Mesh network, and placing one of the eero full-sized routers next to the ASIAIR Pro. The eero uses 9V USB Power Delivery [PD] as power supply, and there are converters available from 12V, albeit a router like that will deplete a battery rapidly. The full sized eero routers uses both 5.2 and 5.8 GHz WiFi bands as its backbone network.

But as I mentioned above, the weakest link may still be the Raspberry Pi 4's LAN port.

ZWO may have already scaled the image before downloading it to your tablet. If not, that is what they should do. I.e., write full sized images to the local memory stick that is attached to the Raspberry Pi 4, but transmitting a binned image to the ASIAIR app, binned and cropped appropriately to the zoom level the user has chosen in the tablet.

Chen

rreed
Posts: 25
Joined: Fri Mar 18, 2016 7:40 pm

Re: 6200MM Saving Image Download Speeds

Post by rreed » Sat Aug 01, 2020 6:55 pm

Ah, so when it is showing the "loading" label, it's actually downloading to the iPad, not to the memory card? It's already saved to the memory card before it shows the "loading" label? If so, the actual saving to microSD is after the exposure ends and before the label says "loading.” And that for my 2600 is only 3 or 4 secs.

So double that time and I should get the approximate time it takes to save a 6200 image unbinned. So if that's the case, 6-8 secs. Not bad at all!

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ASIAIR@ZWO
Posts: 545
Joined: Tue May 29, 2018 3:29 am

Re: 6200MM Saving Image Download Speeds

Post by ASIAIR@ZWO » Mon Aug 03, 2020 9:13 am

rreed wrote:
Sat Aug 01, 2020 6:55 pm
Ah, so when it is showing the "loading" label, it's actually downloading to the iPad, not to the memory card? It's already saved to the memory card before it shows the "loading" label? If so, the actual saving to microSD is after the exposure ends and before the label says "loading.” And that for my 2600 is only 3 or 4 secs.

So double that time and I should get the approximate time it takes to save a 6200 image unbinned. So if that's the case, 6-8 secs. Not bad at all!
Yes, The 'Loading' shows the time that from ASIAIR device to iPad.
ZWO | ASIAIR Support
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Suzhou China

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