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

[John Klingelhoeffer]

On Mon, May 14, 2018, 14:55 Michelle Thompson via Ground-Station
<ground-station at lists.openresearch.institute> wrote:

> 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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