[hpsdr] Chirp

[Mike Seguin]

Good morning, good afternoon, good evening Phil,

Thanks for the update. It will be interesting to how this comes along. I 
do hope we can work with it in the future.

Mike

On 1/8/2014 7:26 AM, Phil Harman wrote:
> Hi Mike,
>
> Thanks for the question.   Chirp support is currently work-in-progress.
> We are building a 2m Chirp beacon (VK6RIO) in Perth to try and crack the
> Perth to South Africa path which has never been done before.
>
> The Perth end will consist of a Penny board synced to a GPS to provide
> frequency lock and 1 PPS for timing. This feeds a modified TenTec 6m
> radio as an exciter then a 100W PA brick.  The antenna system is 4 by 8
> element yagis.
>
> Tx frequency is 144.950 MHz and the Chirp sweep width is 1kHz over 1
> second triggered from the 1PPS of the GPS receiver.  The callsign is
> sent periodically by using forward or reverse sweeps to indicate if a 0
> or 1 is being sent.
>
> The ZS receive end will be a Mercury board plus Metis ( kindly donated
> by TAPR for which we are most grateful) and a GPS to provide frequency
> lock and 1 PPS timing.  A 2m down converter will use the 122.88MHz clock
> from Mercury so all oscillators are GPS referenced.
>
> By integrating over a minute we should be able to detect a signal 50dB
> below the noise floor in a 2kHz bandwidth.
>
> In which case the Effective System Power is about 100MW.
>
> Currently the Tx is fully built and tested and I'm about to start
> building the Rx hardware and writing Rx software.
>
> We have tested the Chirp system both across Australia and within Germany
> and we are getting the theoretical system gain.  Andrew, VK3OE, is using
> a Chirp system on 6m (transmitting from a remote site to prevent
> overload of the receiver) in order to do real-time ionospheric  sounding
> with excellent results - you may have read some of his articles.
>
> In Australia we are allowed 100kHz of bandwidth on bands above 12m which
> means we could sweep over 100kHz for an additional 20dB of system gain
> which will make moonbounce an interesting possibility.
>
> I'm also still writing the receiver decoder software as an addition to
> KISS Konsole so will consider releasing that when completed  - or
> preferably offering the task to someone else :)
>
> 73 Phil....VK6PH
>
>
>
>
>
> -----Original Message----- From: Mike Seguin
> Sent: Wednesday, January 8, 2014 7:29 PM
> To: hpsdr at lists.openhpsdr.org
> Subject: [hpsdr] Chirp
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Is the software for Chirp available anywhere? This looks like an
> extremely interesting mode.
>
> Mike

-- 

73,
Mike, N1JEZ
"A closed mouth gathers no feet"


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