[Ground-station] Upcoming channelizer test opportunity

[Michelle Thompson]

Of course!

I want to test the polyphase filterbank channelizer at microwave
frequencies on the air. Tuneup parties seem like a great environment for
this.

Channelizer could receive output tests from the rigs, in parallel, to
measure performance of the channel separation and all that. This set of
results should be compared to the single channel receiver results for the
same set of radios.

With a polyphase synthesizer, it seems like the rig receive tests could
also be done and tested by SDR.

This is a lot to pull together for this upcoming set of tuning parties.
There are several reasons for a practical example at a real event.

1 Because it gives a deadline.

2 As a practical amateur radio function coming out of gnu radio and SDR.
Show, don’t just tell, how gnu radio works at microwave with SDRs.

3 Demos are super! Tune up events are so much fun.

Polyphase and multirate techniques are fundamental for enabling broadband
channelized microwave stations in both space and terrestrial use. The more
components we have working on the air, the closer we will be to a complete
radio system.

-mdt

On Wed, Jun 26, 2019 at 04:53 Mike Seguin via Ground-Station
<ground-station at lists.openresearch.institute> wrote:

> Hi Michelle,
>
> Could I get a bit more explanation of what you want to test?
>
> The North East Weak Signal Group (NEWS) gets together in a few weeks
> (7/13) for our annual picnic and MDS/ERP testing. This year we will test
> 10/24/47 GHz. In the past we'd also test 78 GHz, but we found we run out
> of time!
>
> We have quite a group of stations that get together. Pic from 2016 of
> the 47 GHz testing attached. We had seven stations that year on 47 GHz.
> It keeps getting bigger.
>
> Mike
>
> On 6/26/2019 6:57 AM, Michelle Thompson via Ground-Station wrote:
> > Later in the summer we usually have at least one tuning party for the
> > 2GHz and Up amateur radio contest. That would be a good opportunity to
> > try on air testing with this channelizer at microwave.
> >
> > The way the test works is there is a transceiver just outside of near
> > field range. Minimum discernible signal and output gain are the two
> > numbers obtained. For the test it’s usually done serially, everyone
> > using same frequency, one at a time.
> >
> > Channelizer wouldn’t replace that setup, but the event has lots of
> > radios all in one place on all kinds of amateur Microwave bands so we
> > should try and take advantage of it, assuming the channelizer will
> > reliably work by then, and that we can put an SDR up on a pole and at
> > least receive with it. 5GHz and 10GHz are straightforward. Above that,
> > we need more RF RX gear.
> >
> > There is another similar event up in Los Angeles, around the same time.
> >
> > So, if you have a local Microwave Group that does something similar, and
> > want to test a channelizer, let me know. At the very least would be a
> > fun paper for Microwave Update or GNU Radio Conference. And, an
> > effective amateur radio demo of polyphase channelizers in practice.
> >
> > -mdt
> > --
> > -Michelle W5NYV
> >
> > "Potestatem obscuri lateris nescis."
> >
>
> --
>
> 73,
> Mike, N1JEZ
> "A closed mouth gathers no feet"
>
-- 
-Michelle W5NYV

"Potestatem obscuri lateris nescis."
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