[hpsdr] Help please

[Graham / KE9H]

Bob:

What are you using Janus for?  It is more for controlling an SDR-1000 or 
other
analog I-Q radio.

If you are trying to bring up a Mercury as a receiver, then take the Janus
off the bus, and put it back in the box.

Put the Mercury and Ozy next to each other on the Atlas to get started.

I suspect that your biggest issue, is that you need to run signal level
calibration on the Mercury receiver.  The very first time you turn
everything on, the noise floor will appear high, and if the AM signals
are strong enough to drive the signal off the top of the panadaptor
screen, then they can sound distorted.

After that, a short wire antenna in the vicinity of the power supply
and you computer, and particularly some LCD screens will pick
up noise.

--- Graham / KE9H



Bob Cowdery wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi all,
>
> I've just put together a Mercury/Ozy/Janus system. I don't normally use
> XP, PowerSDR and I've never seen an HPSDR system in the flesh before
> last weekend so treat me as a beginner. 
>
> I'm having a spot of bother, I thought the best way to test out was to
> do it to the book before I start playing on my own. I don't believe this
> is relevant but I am using XP in VMWare on a Ubuntu host. I've got
> VMWare Workstation 6.5 which supports USB 2.0. 
>
> I've got the latest software from SVN as of tonight. Everything powers
> up and I think the right leds are on. The firmware seems to load ok
> except all the I2C writes fail even though I have a Janus board. When I
> run up PowerSDR and configure it I am just greeted with very high noise
> level and nothing really discernible as a signal except some very
> distorted AM stations. I'm not testing in the shack - too cold so just
> running a small indoor aerial (but it works ok on SDR1000). I suspect a
> noisy PSU but its a new PC type one for quickness. It's plenty capable
> but it sounds much more than just PSU noise and I don't know why that
> would cause distortion.
>
> I've played sample rates and buffer size. Nothing makes any difference
> except 192K and 512 starts to break up the audio a bit.
>
> I don't know how to debug this, is something broken or have I done
> something stupid - the latter I hope.
>
> Thanks
> Bob
> G3UKB
>
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