Project update 2 of 2
First, we want to thank everyone who has purchased a Discovery Dish! We are about two weeks into the campaign now and we’ve reached 30% of our goal. Please help us get there by sharing the campaign with anyone you think might be interested!
Here are the latest updates:
We’ve been working on getting manufacturing of the molds and electronics ready to go once we receive funding. We’re finalizing our CAD files and double checking everything so we’ll be ready to go once the campaign ends. We put six months as our target before shipping, but we’re hoping to actually get the product out sooner than that. The main delays in the timeline will be the Chinese New Year holidays early next year and the time it will take to sea freight our bulk production runs.
For the enclosure, we’ve begun getting samples of the general electronics mounting board. It will be made out of a conductive metal which is important for grounding RF noisy electronics to the enclosure, and will also allow heat to transfer out of the enclosure via a thermal pad underneath the board. Once we get our prototypes we will share more images.
Finally, we’ve received a few questions from customers which we’ll answer publicly below:
Inmarsat is circularly polarized. Is the Inmarsat feed circularly polarized?
Our feeds are all linearly polarized. But this actually does not matter much for Inmarsat because our dish is more than large enough for Inmarsat, and Inmarsat signals are relatively strong. Using a linear feed on a circularly polarized signal results in a 3dB loss which is relatively insignificant in this case. With a small patch antenna such a difference is significant, but not so with a larger dish.
Will this work with a SatNOGs rotator?
Yes, the Discovery Dish comes with a standard pole mount which can be used to mount it on the SatNOGS rotator arms.
What is the amplifier/filter architecture like in the feed?
The signal chain is as follows: Feed -> QPL9547 LNA -> SAW -> QPL9547 -> SAW -> SMA Output. So our feeds are dual-amplified and dual filtered.
Can the coax on the feed be swapped out for longer and lower loss coax?
Yes, the feed uses an SMA connector so you can swap out the coax cable if you like. Thicker cables may require different sized strain-relief at the end of the feed arm, though.
Discovery Dish is part of Qorvo RF Accelerator