[Ground-station] Ballon launch - lightweight inexpensive 10GHz transmit

[Michelle Thompson]

We can try and figure out some link budgets at or after Hamvention. A lot
of TAPR and microwave people will be there.

Also, Kerry and SDMG and SBMS and 50MHz and Up etc. will be able to help
here too with review and sanity checking.

Since we're across from DATV Express at Hamvention, there should be some
good opportunities for sketching things out with them. They have made a
huge amount of progress this year.

We don't have to use 6MHz. I'm partial to going for as wide as possible,
but the most inexpensive dongles are only good up to 2MHz or so. Remember
CQC demo proposal from last year? That category might be what would enable
the most traction, then we go up to 10MHz like we really want.

-Michelle W5NYV

"Potestatem obscuri lateris nescis."


On Mon, May 14, 2018 at 12:45 PM, Phil Karn via Ground-Station <
ground-station at lists.openresearch.institute> wrote:

> On 5/14/18 15:21, Zach Leffke via Ground-Station wrote:
> > Quick reply....haven't ingested everything yet.
> >
> > For Transmit, 10 GHz: (not practical for balloon due to weight/cooling,
> > but maybe as a reference, or at least inspiration)
>
> Is this inherent to the design? There's no way to build a smaller and
> lighter version of the transmitter? What's the mass?
>
> > I'd be very interested in how the phasing of multiple LNBs plays out.
>
> I'm not up on what you/they are trying to do here, but are you
> considering locking all of the converters to a common frequency source
> and processing each feed independently with a SDR to do software beam
> forming and steering?
>
> I think this is the next major step for ham radio now that basic SDR
> technology has become widespread. I've been thinking of doing it on HF
> since even large directional HF antennas have relatively few elements
> compared to, say, 70cm. But if we can do it on X band, great.
>
> 73, Phil
>
>
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