Ev,

But the aggregator can't uplink directly to the satellite as the uplink is outside of the amateur bands.  So the aggregator must send everything to an earth station with a commercial license, correct?

Would the aggregator be single channel or work more like a linear transponder sending along multiple signals in mixed modes at once?

Unless I am wrong, the aggregator must be colocated with the commercial earth station or we are back into Internet required land thereby decreasing the encomm utility of this effort.

Sancho

Sent from my Verizon Motorola Smartphone On Aug 21, 2019 22:34, Ev Tupis via AMSAT-BB amsat-bb@amsat.org wrote:

Hi Michelle, What a fascinating opportunity.  I'd like to try to describe this using different words to see if I get it. Echostar 9 is a geosynchronous satellite with 1 MHz of spectrum to sell. Both the up and down frequencies are outside of the amateur bands. To use it, an aggregator is needed.  An aggregator is a "bridge" device that converts amateur-band RF to satellite uplink RF and setellite downlink RF to amateur-band RF. Amateurs simply need to be in range of an aggregator.  It is the aggregators responsibility to remain aimed at the satellite.

The aggregator determines if it will bridge FM or Linear (SSB, CW, PSK31, etc.) modes. Is this right? Regards,Ev, W2EV

On Wednesday, August 21, 2019, 9:38:12 PM EDT, Michelle Thompson via AMSAT-BB amsat-bb@amsat.org wrote:

An arrangement on Echostar9 for 1MHz of bandwidth for up to 4 years of USA+Mexico+Canada coverage is on offer for $2000 a month.

I'm putting together a grant proposal for ARRL, FEMA, and others to pay for at least year of access. I've gotten some positive feedback already. I think we can make this happen with some fundraising effort. I'm willing to provide the human resources and whatever incidental financing needs to happen to secure a grant for rental.

The main purpose of this type of system would be to enable field deployment of "legacy mode" aggregators, like the Phase 4 Ground ARAP (Amateur Radio Access Point). This is where traffic on any ham band, using FM or analog gear, is digitized by a local "collecting" repeater, and is then sent to a satellite from that repeater. FEMA and ARRL have expressed a lot of interest and support for this in the past. Phase 4 Ground needs an ARAP in order to support legacy radios.

You don't have to personally have a microwave digital uplink. The aggregator equipment does that part for you.

This is most useful for public service and emergency communications. A communications emergency is declared, someone (FEMA, Red Cross, motivated ham volunteer) drops in the aggregator, and all ham traffic it hears is sent to the satellite and then transmitted to the entire footprint.

The downlink is 12-14GHz. This is not 10GHz, but is receivable by individuals using very inexpensive gear. Traffic can be repeated over the internet.

What does this get us?

An opportunity to do all the R&D for the aggregator and get some experience with uplinks.

What do we not have?

A true ham band downlink. You can still receive the downlink yourself, or you can get it over the internet from an earth station distributor.

That's where we're at with *this* proposal.

I think it's worth it to provide a US-based way to design, deploy, test, and use real world aggregator equipment. We learn a lot about GEO comms and figure out a lot of the ins and outs.

Comment and critique welcome and encouraged.

More soon! -Michelle W5NYV _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb   _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb