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[Linrad] Re: MAP65 for SDR-IQ
- Subject: [Linrad] Re: MAP65 for SDR-IQ
- From: Edward Cole <acsalaska.net; kl7uw@xxxxxxxxxxxxxxxx>
- Date: Sat, 28 Feb 2009 22:51:48 -0900
Just a note that I copied you today on 2m JT-65B; sigs about -25,
lots of Faraday and suspected high elevation absorption. I am
downloading MAP65-iq and beginning to set it up to work with
Linrad(win) on my 2.33GB duo-core cpu. Hoping to run both on the
same computer. I will be QRV with JT-65 on 2m at 1730utc looking for
W7EME/WY. Thanks for the new sw!!!
At 06:27 AM 2/16/2009, you wrote:
>Many thanks for your reply to my post about MAP65-IQ! I
>expect that within about one more week I will be ready to
>package the program with some basic instructions so that
>others may test it and provide feedback. I'll let you know
>when it is ready!
> -- 73, Joe, K1JT
>Edward Cole wrote:
> > Joe,
> > I am deffinitely interested. My eme system is H/V switchable in Rx
> > and Tx independently, so I can tap off 2m in the shack to my DEMI
> > 144/28 + SDR-IQ whihc is connected to the computer via USB-2.0. I
> > have an earlier version of MAP-65 and winrad and JT-65 all on a Dell
> > Vostro duo-core2 2.33 Gb computer (win-XP-Pro).
> > 73, Ed
> > QRV with 2m-8877-600w
> > At 11:08 AM 2/13/2009, you wrote:
> >> Hello Moonbouncers,
> >> Many people have asked about a version of MAP65 that could
> >> be used with the SDR-IQ receiver. I'm happy to report that
> >> an operational version of "MAP65-IQ" now exists. It should
> >> be ready soon for testing by others.
> >> You'll recall that MAP65 works together with Linrad in a
> >> dual polarization or "stereo receive" system. It takes
> >> advantage of many of Linrad's excellent features -- the
> >> waterfall displays, noise blanker, dual-channel coherent
> >> processing, etc. -- as its receiving "front end". Partially
> >> processed data are sent from Linrad to MAP65, which searches
> >> for all JT65B signals in a 90 kHz bandwidth, measures the
> >> polarization angle of each one, and decodes them all. The
> >> Linrad sample rate must be set to 96000 Hz.
> >> MAP65-IQ differs from the standard MAP65 in respects:
> >> 1. MAP65-IQ is intended for use with single-polarization
> >> systems. (Thus, no polarization matching can be done.)
> >> 2. MAP65-IQ uses a slightly different sample rate, 95238.1
> >> Hz, in order to be compatible with the SDR-IQ hardware.
> >> MAP65-IQ appears to work very well. In one test using the
> >> H-polarization (horizontal) data from 11 minutes of the 2006
> >> ARRL EME Contest, MAP65-IQ decodes 82 messages from 24
> >> different stations spread over the range 144.100 - 144.160
> >> MHz. For comparison, the standard MAP65 decodes 127
> >> messages from 36 stations in the same 11 minutes of data,
> >> using both H and V polarizations. For a rough sensitivity
> >> calibration, I was using a pair of 2MXP20 yagis when these
> >> data were recorded.
> >> These results are just what one would expect: the somewhat
> >> smaller number of messages decoded by MAP65-IQ is a result
> >> of its having no access to data in the "other" polarization.
> >> In order to make tests of MAP65-IQ you'll need a receiving
> >> setup with Linrad and an SDR-IQ, and you must be familiar
> >> with the use of JT65 in WSJT. If you meet these
> >> requirements and would like to participate in early tests of
> >> MAP65-IQ, please send me an email with some details.
> >> -- 73, Joe, K1JT
> > >
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