, April 25, 2008 11:54 AM
To: Dave Blaschke
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] CW QSK ability
Dave --
I wrote the iambic keying code that's used in PowerSDR. I myself am a 99%
CW
op and was when I was first licensed in 1962. The Bobs N4HY and K5KDN are
superb
is built from the ground up.
-Tim
-Original Message-
From: [EMAIL PROTECTED] [mailto:
[EMAIL PROTECTED] On Behalf Of Frank Brickle
Sent: Friday, April 25, 2008 11:54 AM
To: Dave Blaschke
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] CW QSK ability
Quoting Robert Dennison [EMAIL PROTECTED], on Sat 26 Apr 2008 05:36:16 AM PDT:
We now await the first release of the new SW architecture
implementation.. The application just screams for multiprocessor -
multi-threaded implementation and that's the new architecture. In so
many ways,
Jim,
When I'm not getting QSK and my CPU is at 8%, I'm wondering where the
bottleneck is. 250ms latency is a real long time in the cpu universe.
73 Ed W2RF
On 26 Apr 2008 at 6:37, Jim Lux wrote:
Quoting Robert Dennison [EMAIL PROTECTED], on Sat 26 Apr 2008 05:36:16 AM
PDT:
We now await
At 08:36 AM 4/26/2008, Robert Dennison wrote:
snip running semi break doesn't bother me at
all! The difference is about a tenth of a second very fine for my DX
work!
vy 73
Rob
AB7CF
After having used our conventional full duplex telephone system, you
really wouldn't want to go back to a
Without getting into a long discussion -- the situation isn't really that
complex, nor is it worth spending more than a few further moments on -- the
problem is all in the audio subsystem. Between PowerSDR, PortAudio, VAC, and
realtime user monitoring requirements, the fact that anything
The problem isn't PowerSDR. It's the lack of integrated, rational support in
Windows for the kinds of state transitions in the audio subsystem that a QSK
application requires, especially when users demand that it also cooperate
transparently with third-party applications over which PowerSDR has
there is no empirical data to make any reasonable assumptions.
-Tim
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Brosnahan
-- W0UN
Sent: Saturday, April 26, 2008 12:53 PM
To: Frank Brickle
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] CW QSK
Hi Gang:
I think this is a good question Is OS Ubuntu a better way to do SDR.
Ed
WA3BZT
John Brosnahan -- W0UN wrote:
The problem isn't PowerSDR. It's the lack of integrated, rational support in
Windows for the kinds of state transitions in the audio subsystem that a QSK
application requires,
It's a damn sight better than spark gap, that's for sure.
See y'all. I have a couple of months' work to do and three weeks to do it.
73
Frank
AB2KT
On Sat, Apr 26, 2008 at 1:40 PM, Edward J White [EMAIL PROTECTED] wrote:
Hi Gang:
I think this is a good question Is OS Ubuntu a better way to
Thanks Frank,
Nuf said
vy 73's
Rob
AB7CF
On Sat, 26 Apr 2008 12:40:31 -0400 Frank Brickle [EMAIL PROTECTED]
writes:
Without getting into a long discussion -- the situation isn't really
that
complex, nor is it worth spending more than a few further moments on
-- the
problem is all in
Am Freitag, 25. April 2008 02:50:46 schrieb Jim Lux:
snip
I believe that's what the latest versions of PowerSDR do.. they run
the Rx continuously, and gate the audio off during Tx time. More than
snip
If so, audio keying may be the problem.
If you want to work QSK, you want to hear the signals
Jim,
Thanks for the interesting theoretical reflections. The question
remains as to why the 5k behaves the way it does in the shack. Please
see the 2nd tier responses inserted below:
On 24 Apr 2008 at 17:47, Jim Lux wrote:
At 11:41 AM 4/24/2008, Ed W2RF wrote:
After the completion of
Guenter,
The suggested operation would be that you hear both your transmitted
signal and the band between dots properly aligned, only delayed by
the latency interval. In practice the 5K doesn't do this. You might
hear the band during the start of the first keying element. Then only
pops and
OK, here is my final word on this topic.
PowerSDR/SDR-5000 is an outstanding performer, in my opinion. So it
is my hope that this QSK topic will be given due consideration by the
PowerSDR programming team. CW may be dying, but we CW operators are
not. Guys, don't let this deficiency go
Of Frank Brickle
Sent: Friday, April 25, 2008 11:54 AM
To: Dave Blaschke
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] CW QSK ability
Dave --
I wrote the iambic keying code that's used in PowerSDR. I myself am a 99% CW
op and was when I was first licensed in 1962. The Bobs N4HY and K5KDN
up.
-Tim
-Original Message-
From: [EMAIL PROTECTED] [mailto:
[EMAIL PROTECTED] On Behalf Of Frank Brickle
Sent: Friday, April 25, 2008 11:54 AM
To: Dave Blaschke
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] CW QSK ability
Dave --
I wrote the iambic keying code
:54 AM
To: Dave Blaschke
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] CW QSK ability
Dave --
I wrote the iambic keying code that's used in PowerSDR. I myself am a 99%
CW
op and was when I was first licensed in 1962. The Bobs N4HY and K5KDN are
superb, long-time
-radio.biz
Sent: Thursday, April 24, 2008 12:13 AM
Subject: Re: [Flexradio] CW QSK ability
Quoting Dave Blaschke [EMAIL PROTECTED], on Wed 23 Apr 2008 09:33:37 PM PDT:
At 03:08 4/24/2008, you wrote:
. ...I'm not a CW kind of guy, so I don't recall the details of
the problem), because
is supposedly set for
QSK.
73,
Jay W5SL Austin
- Original Message -
From: Dave Blaschke [EMAIL PROTECTED]
To: Jay Sewell [EMAIL PROTECTED]
Sent: Thursday, April 24, 2008 10:59 AM
Subject: Re: [Flexradio] CW QSK ability
The best performance I can obtain for QSK is at the following
: Re: [Flexradio] CW QSK ability
Quoting Dave Blaschke , on Wed 23 Apr 2008 09:33:37 PM PDT:
At 03:08 4/24/2008, you wrote:
. ...I'm not a CW kind of guy, so I don't recall the details of
the problem), because
that allows you to get a rhythm. (after all, absolute delay
-- Original message --
From: Jay Sewell [EMAIL PROTECTED]
SNIP
They were able to duplicate the problem in my
radio and in others in their shop and find that the problem seems to be key
contact bounce with some keys, not all, that causes the problem.
I
The best performance I can obtain for QSK is at the following settings:
GENERAL-AUDIO-Buffer: Size 512, Sample Rate: 48000
GENERAL-OPTIONS: Process Priority: High
DSP: TX Buffer Size: 512, RX Buffer Size: 512
Delay (ms): 10 (minimum setting)
At these settings I see around 10% CPU utilization on
: Thu, 24 Apr 2008 01:00:12 +
From: Dave Blaschke [EMAIL PROTECTED]
Subject: [Flexradio] CW QSK ability
To: flexradio@flex-radio.biz
Message-ID: [EMAIL PROTECTED]
Content-Type: text/plain; charset=us-ascii; format=flowed
I quote from the Flex web site:
T/R turn around times are limited
Please correct me if I am wrong, but it appears to me that QSK on a
SDR encounters a wall at the receive latency interval, which sets a
minimum bound for recovery of reception.
After the completion of transmitting a code element, the receiver is
going to be receiving the tail of that element
Al,
Perfectly well put!
I remeasured the current PwrSDR RX latency, using the delay from
known beacon transmissions, with DSP 4096/256:
192khz 1024buf 86ms
96khz 512buf 152ms
48khz 256buf 247ms
73 Ed W2RF
On 24 Apr 2008 at 13:39, Al Groff, K0VM wrote:
System T/R turn around is
Groff, K0VM
Subject: Re: [Flexradio] CW QSK ability
Al,
Perfectly well put!
I remeasured the current PwrSDR RX latency, using the delay from
known beacon transmissions, with DSP 4096/256:
192khz 1024buf 86ms
96khz 512buf 152ms
48khz 256buf 247ms
73 Ed W2RF
On 24 Apr 2008 at 13:39, Al
Hi guys,
I was born and raised on Telegraph Rd (true,) I never bought a mic for my
SDR, don't know psk from rtty and I have to agree with your comments but
consider...
So okay until you get that first receive buffer filled you aren't going
to hear anything on switch to receive:
512/48,000 =
At 09:58 AM 4/24/2008, Dave Blaschke wrote:
The best performance I can obtain for QSK is at the following settings:
GENERAL-AUDIO-Buffer: Size 512, Sample Rate: 48000
GENERAL-OPTIONS: Process Priority: High
DSP: TX Buffer Size: 512, RX Buffer Size: 512
Delay (ms): 10 (minimum setting)
At these
At 11:41 AM 4/24/2008, you wrote:
Please correct me if I am wrong, but it appears to me that QSK on a
SDR encounters a wall at the receive latency interval, which sets a
minimum bound for recovery of reception.
After the completion of transmitting a code element, the receiver is
going to be
At 05:30 PM 4/24/2008, Robert Dennison wrote:
Hi guys,
snip
Otherwise only solution I can see is to use pin diodes for T/R and keep
filling the receive buffer while transmitting... then
throw the bad stuff in the receive buffer away and process the rest.
That would be one heck
Hi Jim,
Good to hear from you!
Okay let's test the breakin at 40 words per minute at 5 characters/word
and 3 symbols/character that's about 100 msec of total processing time
per symbol. That seems pretty reasonable. At 40 WPM a total time
budget of:
10 msec T to R
20 msec buffer processing
Quoting Robert Dennison [EMAIL PROTECTED], on Thu 24 Apr 2008 06:55:34 PM PDT:
Hi Jim,
Good to hear from you!
Okay let's test the breakin at 40 words per minute at 5 characters/word
and 3 symbols/character that's about 100 msec of total processing time
per symbol. That seems pretty
I quote from the Flex web site:
T/R turn around times are limited only by the transmit relay delay
with a mean turn-on time of an unbelievable 2.5 ms and a turn-off
time of 1.5 ms
How do I obtain this performance with my SDR-5000? As I adjust
Delay(ms) on the front panel of PowerSDR it only
Quoting Dave Blaschke [EMAIL PROTECTED], on Wed 23 Apr 2008 06:00:12 PM PDT:
I believe that the limited QSK capability of PowerSDR/SDR-5000 has
been its chief (and perhaps only) weakness on CW. My old FT1000D
handles QSK much more smoothly and rapidly. Perhaps SDR radios, by
their very
At 03:08 4/24/2008, you wrote:
. ...I'm not a CW kind of guy, so I don't recall the details of
the problem), because
that allows you to get a rhythm. (after all, absolute delay isn't a
huge deal, because there's already 10s of milliseconds delay in the RF
propagation to the other station).
Quoting Dave Blaschke [EMAIL PROTECTED], on Wed 23 Apr 2008 09:33:37 PM PDT:
At 03:08 4/24/2008, you wrote:
. ...I'm not a CW kind of guy, so I don't recall the details of
the problem), because
that allows you to get a rhythm. (after all, absolute delay isn't a
huge deal, because
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