Andy
There are plenty of reasons for for using DIGU/DIGL instead of USB/LSB
for digital with Fldigi and VAC.
1. Your Filters in PowerSDR are programmable and can all be customized
anyway you want them ,
so thats not a reason to choose USB over DIGU. In DIGU mode just
Right click on the 75hz filter and you'll be able
to narrow that down to a minimum of 10hz or a maximum of about
10khz, and rename the button from 75 to 10 or any other value you choose.
2. The DIG-X modes don't pass the audio from VAC through the mic mixer,
EQ, Compander, Leveler, ALC or DX compresser, the audio stays Digital
and clean from PowerSDR into Fldigi. so your going to see cleaner
waterfalls and better decoding. The Signal from Fldigi stays Digital and
clean headed to PowerSDR transmit also. Once you get the VAC levels set
in DIG-X you don't have to remember to reset them after running SSB. and
since you wont have to turn off all the EQ, Compander, or DX compresser
functions, when you decide to run SSB again all your Transmit audio
settings will still be the way you want them.
The Radio isn't in the hardware it's in the software and that's
reconfigurable so there's no reason to prefer one mode over the other.
The only difference between DIG-X and X-SB that im aware of is that
DIG-X doesn't mess up the signals.
I run PSK31 in DIGU with a 1Khz Filter and set the AGC to Fixed then
adust the AGC/T lower until all the noise disappears from the Fldigi
waterfall if I suspect there might be something decode-able that's to
faint to be seen then toggling The Preamp on makes it show up. but I get
better decodes by not over driving Fldigi. With the AGC turned off you
dont have to worry as much about a strong signal swamping out the
waterfall. Keep in mind the TNF notch filters you can lay one, or
several on top of whatever your trying to avoid and your back in
business even if there's nearly no space in between.
But if you like running Digital in USB with the Flex then knock yourself
out, The radio is supposed to be fun to use. Use it how you like.
Digital is fun, its "funner" with a Flex.
You might have already Seen this info. Using Fldigi with PowerSDR
<https://fedorahosted.org/fldigi/wiki/Documentation/HOWTO/PowerSDR>
I hope you've Seen this one too. Flex Radio Wiki
<http://flexradiowiki.abrohamnealsoftware.com/mw/index.php?title=Main_Page>.
Don't get in a huge rush to "Know It All now" Take your time and learn
it right, You'll likely praise it more than cussing it! and that's a
good feeling to have. Here's hoping you have it often.
73
Jay - NO5J
On 6/20/2013 10:34 PM, Andrew O'Brien wrote:
Those folks at Flex are going to regret ever selling me a radio, so
many questions!
I am intrigued about the difference between "USB" and "Digu" in
PowerSDR and the Flex 3000. I see one major difference for us finicky
digital mode operators, one where USB is better than Digu, both with
VAC on. It seems that using Digu with a VERY narrow PowerSDR filter
setting (e.g 50 Hz), a waterfall in a digital mode application like
Fldigi still displays about 900 Hz of signals. If I switch to USB
mode with exact same Low and High settings , Fldigi's waterfall can be
narrowed down to around 80Hz. There are some advantages to the
narrower Fldigi display in terms of getting rid of adjacent strong
signals. What is the technical explanation for USB being able to
cause a much narrower minimum bandwidth display than Digu ?
Andy K3UK
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This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for
posting topics related to SDR software innovation and other technical SDR
topics.
