At 09:06 AM 4/5/2006, Lee A Crocker wrote:
While you're at it complain about the fact that you
can't install more than one firebox. The drivers do
not allow you to use 2 therefore you can not expect to
install 2 SDR-1000's using fireboxes. I contacted
them as well about this issue and got the were looking
at it real soon now.... real soon.
They have a new 1394 product line that supports multiple boxes..
specifically designed for the expandable style of
operation. http://www.presonus.com/inspire1394.html
Daisy Chain for More Inputs
The INSPIRE 1394 is equipped with two FireWire connectors enabling the
ability to daisy-chain up to FOUR INSPIRE 1394's together for up to sixteen
simultaneous inputs at 24-bit/96k recording rate.
Jim
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Subject: Re: [Flexradio] All Firebox users - Please read
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At 09:12 AM 4/5/2006, Tim Ellison wrote:
Jim,
Thanks for your comments and insight.
I hope you are not correct in you presumption that they might not fix it
for the reason you stated below, but that is a possibility.
Given the propensity for magazines to do reviews of products on raw
performance numbers, they'll probably never open up the front end, because
the noise floor would probably come up. Some audio recording oriented
reviewer will probably also whine about aliasing, etc.
What "might" be a possibility is that there will be some quasi documented
"hack" that gets you there (i.e. lifting pins and soldering a wire around a
filter)
Even with
the limitations using 96K, the Presonus is a very good interface for use
with the SDR1K with the particular features it brings to the table, such
as balanced inputs, mic preamps, headphone jack and volume control and
the good dynamic range numbers.
If they do no choose to fix the problem, then I suspect I'll be looking
for a more complete solution in the future.
-Tim
---
Integrated Technical Services
"You can't close the door when the walls cave in" --Robert Hunter
-----Original Message-----
From: Jim Lux [mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 05, 2006 11:12 AM
To: Tim Ellison; Flex Radio
Subject: Re: [Flexradio] All Firebox users - Please read
At 06:44 AM 4/5/2006, Tim Ellison wrote:
>I am sure all of you are aware of the issue with the Firebox related to
>the substantial roll off of the noise floor starting at 24 KHz when
>operating at a sampling rate of 96 KHz. If not, you can refer to the
>follow up post by Eric on 3/30/09 entitled "Panadapter at 96K
>Questions".
><snip>
Welcome to the wild and woolly world of using devices with A/Ds outside
their nominal intended uses. The same problem exists with FPGA boards
for developing DSP applications. They'll make some reasonable design
decisions (like a LPF before the A/D intended to digitize, e.g. video)
and then, when you want to do something like IF undersampling, you can't
get to the raw A/D input.
Sometimes the mfr is responsive, other times they aren't. Sometimes
it's a lack of technical support resources to give you the data you
need. Sometimes it's that they don't want the hassles of explaining why
the modified board doesn't behave as expected, or, that they aren't
confident it will work at all, and have no time/money/staff to find out.
You can contact me off list if you want specific companies that I've
found are good and/or bad to work with in terms of this.
>So, it looks like we need to band together as a disgruntled user base
>and mount a letter (e-mail) writing campaign to request that the
>firmware be fixed so that we get the attention of Presonus and put this
>issue on their radar. It should be a polite correspondence indicating
>the problem, the fact that it is a known issue and that you would
really
>appreciate them making an effort to fix this in a timely manner. If
>they get inundated with requests, it should expose the problem.
Given that they are a consumer equipment manufacturer, don't hold your
breath. They can make a perfectly reasonable marketing decision that
it's
not worth it. Here's an idea.. see if you can figure out how many of
these
widgets the company sells total, and what fraction of that we SDR1000
users
are. Maybe looking at serial numbers might give a clue? If they're
selling 10,000 units/month, we're not a very big market in comparison.
If
they're selling 10 units/month, then we are.
>Here are the folks at Presonus that this effort should make an impact
by
>reading you letters. I am sending my letter to all of them.
>
>Kurt Bueche - Vice President, Operations: [EMAIL PROTECTED]
>Chad Kelly - Customer Service Manager: [EMAIL PROTECTED]
>Rick Naqvi - VP of Sales and Marketing: [EMAIL PROTECTED]
>Brad Zell - Director of Marketing: [EMAIL PROTECTED]
My own preference would be to call (on the phone) the marketing folks,
or
try to hit them up at a trade show.
AES is in the fall, so that's a while from now. They were/are showing at
Musikmesse international trade show in Frankfurt. Perhaps at NAB in Las
Vegas at the end of April? Explain why providing this capability is
useful
to ALL of their customers (not just the tiny number of hams with
SDR1000s)
The customer service manager isn't really involved in product design
issues. He'd actually resist any sort of modification or change in
performance that might adversely affect their core clientele (folks
recording audio in small studios), and the ops manager is just worried
about producibility and driving the last penny out of the build cost.
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875
