Art and all,
You missed the point I was making - there are no birdies noted within the
limited tuning range provided. This thing, as built will ONLY tune from
7.030 to 7.080. It was not designed as a complete receiver that covers the
entire band. I'm absolutely certain there would be junk received outside of
that range were it able to tune there.
Plastic enclosure? What enclosure. Mine is operating on the desk as a
bare, unshielded board. The only shielding involved is the coax to the
antenna and the shielded audio cable from the I-Q output on the board to the
Line input on the sound card.
The enclosure is not supplied with this simple kit. If you want to put it
in an altoids can or any other metallic enclosure, this is easily done,
subject to whatever your imagination can devise.
I'm merely stating that it OPERATES AS ADVERTISED by the designer.
W0EB
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-----Original Message-----
From: softrock40@...
[mailto:softrock40@...] On Behalf Of KY1K
Sent: Sunday, September 18, 2005 12:07 PM
To: softrock40@...
Subject: RE: [softrock40] Re: Interference from PC?
OK, this person has experience, my views are different and contrary
to this persons real life observations.
Apparently there is no interference when operating the softrock-40
without shielding. Congrats to the designers of the softrock-40,
they've managed to do something never before done in the history of
receiver design.
However, I've never seen a high quality receiver made available in a
plastic enclosure..............
GL to all.
Art
At 12:47 PM 9/18/2005, you wrote:
I have my softrock 40 running. It's plugged into an
external USB hub
for power, and hooked up to my B & W broadband folded dipole. I can
find no birdies within it's limited tuning range - 7.030 to 7.080 as
specified in the AMQRP info. It is extremely sensitive, and copies
signals within that range as well as my K2 does, and that's saying
something. The K2 has by far the best receiver of any rig I've ever
owned.
All this talk about computer birdies and pc noise is pretty much
unfounded. There is NO noise apparent with the scope on the
DC voltage
line coming from the USB port.
The computer is a Dell Dimension 8100, Pentium IV @ 1.4GHz and even
with the covers off, I still cannot find any birds
attributable to the
computer.
I AM using just the bare-bones, unsupported SoundBlaster PCI
sound card
that's built into the Dell's motherboard. It performs
adequately for
the Soft Rock 40, but I would presume to say that if one had an
SDR-1000, this card would definitely be struggling. My
sampling rate
is only 48 KHz, and it still does very well.
Maybe this will allay some of the fears I see expressed here on the
reflector.
What the heck do you expect for $23 bucks a full blown
SDR-1000? Jeez,
lighten up and experiment with the thing! It works as
advertised, and
maybe even better considering the low end sound card I'm using.
Jim - W0EB
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