Re: LF: Probably not a new question...

[Andy Talbot <andy.g4jnt@googlemail.com>]

I find the SDR-IQ a superb little box, and is better than any comms reciver I've used over the years.   And that applies especially to several professional, including early generation digital, receivers.  Some of which are really horrible and non-user friendly.  That may be becasue they're designed for the intercept / comin operator, but not nice

 

 The I/Q  receives, and is flat, down to 500Hz (yes, not a typo, really do mean  0.0005MHz), has a calibrated screen for absolute power measurement, two audio channels demod simultaneously (one in each ear !)  continuously variable filters, a nice GUI,  up to 190kHz spectrum visible at any time, with a waterfall FFT resolution down to a fraction of a Hz if wanted, continuum mode for wideband noise measurement, CW SSB, AM, FM demodulation and other things that don't come to mind at the moment.

 

I use it more as a piece of test equiment rather than a Rx, but it does the latter excellently.   Vastly prefer it to the RA1792 I got rid of because it wasn't as good as the SDR-IQ.  it has a serial output and can control a subset of external receivers / converters.  One project on the list is a direct upconverter with a DDS derived LO that is controlled by point-and-click on the SDR I/Q for transceive operation.

Andy
www.g4jnt.com

On 26 April 2010 21:59, Daniele Tincani <daniele.tincani@alice.it> wrote:

Hi Wolf, Marco, LF,
Marco below cited some "classic" receivers (Racal 1792, Eddystone 1650, Rohde&Schwarz EK081...and I imagine some Watkins-Johnson's could join the group) and Perseus. Despite of the fact that all of these are some dB's higher than my budget, I'm interested in your opinion about how best SDR's compare with "classics"...Probably I'm wrong, but I believed that top-rated radio's like Racal, Eddystone, R&S, W-J, etc. distinghished over the others because of their superior construction, even from a mechanical point of view (no wide-band circuits, lots of metal screens, etc.). How is this level of quality achieved in modern SDR's?
Cheers
D.

----- Original Message ----- From: "Wolfgang Büscher" <dl4yhf@freenet.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, April 26, 2010 10:11 PM
Subject: Re: LF: Probably not a new question...

Beware, the Perseus doesn't work at a few kHz; it's nice for LF (where I
use it too), but not for the lower VLF range.
The reason is, I guess, the input filter which has an "L" between the
input and ground (unlike SDR-IQ) .

Cheers,
 Wolf .

Marco IK1ODO schrieb:

At 20.55 26/04/2010, you wrote:

You may  be  better  building a LF convertor ?

G ..

I agree... probably a better choice, if you already have a _decent_ HF
receiver.
If not... consider buying a Perseus, but the price is 4,4 dB higher
than your target :-)
Otherwise, Racal 1792, Eddystone 1650, Rohde&Schwarz EK081, all in the
500-1500 Euro range.
I don't consider amteur radio receivers to be good radios, expecially
at LF.

73 - Marco IK1ODO

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