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With all the excitement about the SR40 on 40m and 30m .....maybe 80m and 60m and keeping it simple ....pluggable bandswitching, etc ....I'm thinking laptop, QRP CW operation in the field.

How much can you reduce the computer load/requirement and still have acceptable performance. What have you guys tried and had success using ?

73 Kees K5BCQ

I have been successful with using a < 1 GHz system with the on board audio
card. I am using an offline (not connected to the internet) computer. The
ASIO4ALL driver makes a big difference in performance. I have turned off the
virus checker and other spy blocking software as it is not needed. It can
take a while to find the combination that will work but once you find it the
SR-40 will be quite impressive. A high performance system is not necessary!
73 - Mike WA8BXN

--- In softrock40@..., "windy10605@j..." <windy10605@j...>
wrote:

How much can you reduce the computer load/requirement and still have

acceptable performance. What have you guys tried and had success
using ?

By far the biggest portion of the computing power is eaten by the
console and graphics. The DSP is an amazingly small part of the total
computational load. The spectrum and associated display functions are
really the cycle hogs.

If you slow down the spectrum update rate to, say, 5 per second, or
turn it off completely, you don't need much machine to service the
essential radio functions. I've run the Linux version "headless," that
is, with no graphics at all, on a 533MHz Pentium.

73
Frank
AB2KT

I had tried to load Power SDR on my workshop laptop over the weekend and it
hangs up at initializing DSP. The computer is a 1997 IBM Thinkpad 770
running Windows 98 with 160 MB of RAM. When I go to system properties, all
it says is Genuine Pentium, not the speed. I am assuming that it won't work
with this computer?
I got everything loaded last night on our new Dell 3 Ghz machine with no
errors after having to uninstall Power SDR a few times (I must have done
something wrong installing it since I got a fatal error) before figuring out
how to do it right. Thanks Chuck Carpenter for your how to from the Sept 24
QRP-L. I am no computer whiz at all and needed a lot of hand holding here!

Chris
KD4PBJ

Depends entirely on your perception of what operation
in the "field" is. As soon as you mention "laptop" the
idea of "field operation" contracts to a few hours on
a picnic bench within reach of your car.

Laptops are battery hogs and most won't last more than
2 hours on battery power. The idea of lugging a laptop
that weights 5 or 10 times as much as the all the rest
of the QRP station and consumes 10-50 times as much
power isn't all that appealing for field use. And in
the end, it won't significantly outperform the analog
rigs costing 50-100 times less.

My Toshiba Satellite 1105, a low-end laptop that works
fine with the SR-40, weighs more and draws more than
my K1, K2 and KX1 COMBINED. That's why you don't see a
lot of digital mode use in the field.

The SR-40 is not a minimalist rig. It is a minimalist
rf plug-in for a relatively (by QRP standards) heavy,
complex, expensive computer. That's not criticizing
the SR-40; it's putting this new creature in
perspective. An SR-40 based SDR is primarily a
computer app. The hardware is a computer, and those
are still comparatively large and inefficient.

Current laptops are designed for desktop use or short
periods of "portable" use within sight of an AC
outlet. When computer hardware comes down in size and
power consumption, SDR in the field becomes practical.
It's already highly evolved and practical with analog
techniques.

Eric
KE6US
www.ke6us.com



--- "windy10605@..." <windy10605@...> wrote:

With all the excitement about the SR40 on 40m and
30m .....maybe 80m and 60m and keeping it simple
....pluggable bandswitching, etc ....I'm thinking
laptop, QRP CW operation in the field.

How much can you reduce the computer
load/requirement and still have acceptable
performance. What have you guys tried and had
success using ?

73 Kees K5BCQ



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