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Friday, April 19th, 2013
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Andrus MK 1.5 SDR

This is the Andrus MK 1.5 SDR. Im excited about it, because this moderate- to low-cost SDR is very interesting; it has three receive channels, and it offers receive bandwidths up to 400 kHz, which is wide enough to completely cover the voice portions of the 160, 80, 40 and 20 meter ham bands, as well as all the WARC bands and many SW bands.

As far as the channels go, I've only implemented one channel with SdrDx so far, which provides the usual 0-30 MHz receive capability; but the unusually wide bandwidth alone sets this SDR apart from the others I've used.

The second channel, which can operate independently and in parallel with the first, has the potential to be used with a short noise probe antenna to remove locally generated noise; thats a lot of code away — I will need to implement variable phase and amplitude mixing, quite aside from pulling in twice as much data over ethernet — but the possibility is very real. This channel could also be used as a second, completely independent front end, if I understand correctly that could turn into legitimate dual-receive. Well see. I have my fingers crossed.

The third channel is a little bit of awesome. It provides a 0-30 MHz scan across the entire receive range; I don't in any way expect this will allow actual receive audio (the RF spectrum will be decimated beyond the resolution required to pull out audio), but it should give us a way to see wideband activity on both the spectrum and waterfall, things such as solar flares, which bands are open all at one glance. I hoping to get this going next.

I'm waiting on some info from the manufacturer right now, and believe me, I will update the SdrDx beta the moment I have this unique wide-overview channel running, if indeed I can make it all work. Hey. I wonder if the C channel is independent as well? If so, an independent wideband display could give you point-n-click access to the entire 0-30 MHz spectrum. Hoo.

*** Just got the word; these features are not yet implemented into the ethernet communications, so we won't be seeing them yet. They are coming, though, I've been assured.

You need a 1 amp (or more) 5 vdc power supply (or two free, full power [500 ma] USB ports) to power it. I bought one of these. My unit came with a dual-headed USB cable for this purpose. I am not using the USB interface to talk to it; ethernet only. The USB cable you see above is connected to the 2 amp USB power supply block visible at the upper right, not to my Macs USB connectors.

As I understand it, the Andrus MK 1.5 SDR is made available via EBay; I did not get mine that way, mine came direct from the manufacturer, so I have no buyers experience to pass along.

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