Tony Parks wrote: Hi Alberto,
The switches used are two of the switches in a FST3126. I am needing to
stay with this part for the v5.0 SoftRock to use a large supply of the parts
I had to buy as part of a minimum order.
Would a lower on resistance improve the performance of a QSD circuit? Hi Tony, the RdsOn is practically in series with the 50 ohm of the antenna or the output impedance of a preceding preamplifier. So for the maximum of efficiency you want to keep the switch resistance as low as possible. The FST3125 is rated for an RdsOn of 4 ohm, while the ADG704 (or the ADG711 if you prefer 4 separate switches instead of a mux) is rated for 2.5 ohm. Of course if you design your preamplifier with a somewhat higher output impedance, then the issue is much less relevant... 73 Alberto I2PHD
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What?generates the nice 7.054- 7.056Mhz signal on the computer
(PowerSDR or Rocky) when the SR-40 is not installed ? Excellent choice for the
crystal freq, by the way.?No sense having 2 large spurs. I realize there
are going to be small spurs because of the inherent nature of computer clocking
and signal transition radiations.
?
I'm not surrounded by SR-40 users but out of curiosity, how much of the OSC
does it put OUT into the antenna ?
?
73 Kees K5BCQ
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Hi Alberto,
The switches used are two of the switches in a FST3126. I am needing to stay with this part for the v5.0 SoftRock to use a large supply of the parts I had to buy as part of a minimum order.
Would a lower on resistance improve the performance of a QSD circuit?
73,
Tony KB9YIG
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----- Original Message ----- From: "Alberto I2PHD" <i2phd@...> To: <softrock40@...> Sent: Monday, October 17, 2005 9:29 AM Subject: Re: [softrock40] Two switch QSD test kb9yig wrote:
Good Evening All,
I am testing a two switch QSD circuit for use in the v5.0 SoftRock.
The switches in the QSD are each on for 50% of the clock cycle and
staggered by 90 degrees. All other circuits in this test version of
the SoftRock are the same as the v4.0 SoftRock.
[snip]
Tony,
which analog switches are you using ? Just curious...
Have you given a look at the Analog Devices ADG704 ?
They have a very low RdsOn, I have used them with success
(were it not for the pesky 0.5mm spacing between pins...)
73 Alberto I2PHD
Yahoo! Groups Links
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kb9yig wrote: Good Evening All,
I am testing a two switch QSD circuit for use in the v5.0 SoftRock. The switches in the QSD are each on for 50% of the clock cycle and
staggered by 90 degrees. All other circuits in this test version of
the SoftRock are the same as the v4.0 SoftRock. [snip]
Tony, which analog switches are you using ? Just curious... Have you given a look at the Analog Devices ADG704 ? They have a very low RdsOn, I have used them with success (were it not for the pesky 0.5mm spacing between pins...) 73 Alberto I2PHD
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Rocky v1.03 msg: Unable to start output to SB Live Wave Device
Running XP SP2 with SB Live 5.1 PCI card.
thanks
Dick Patten
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Re: WDM drivers for soundcards
Hi Rein,
Windows Driver Model (WDM) was first implemented in Windows 98, in a limited form, and it did not work very well. In the later versions of Windows WDM was significantly improved. I cannot tell in advance if Rocky will or will not work on Win98SE. If it doesn't, there is nothing I can do about it. In any case, if your hardware is good enough to run SDR software, it should be able to run at least Windows 2000, so you have an option to upgrade your OS.
Some info about different versions of WDM is available here:
73 Alex VE3NEA
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Hello All,
Not really understanding what you all are referring to, I searched for
"WDM and sound cards"
Here is the result from Microsoft. for XP though
Note I hope to be able to run rocky on a 98se system ot trying to
understand why it
should not run
73 Rein W6/PA0ZN
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Hello to Alex and all...
I beleive the driver you use for the Creative Audigy 2 NX (USB) is
treating the input as MONO (or rather a mix of the I and Q channels.)
Made sure it's the case by feeding only one channel at a time.
Hopefully that and the windows mixer that does'nt change the level of
the signal when the slider is moved all the way may help you pinpoint
the reason this USB card does'nt work properly (it does work ok with
other software packages but they use different drivers.)
73 de Joe
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Hello to Alex and all
Tried version 1.02,results:
Signal saturates at appr. 40 db mark (96 or 48 khz)
(By the way the center spur(dc freq.) is approximatley 45 db on the
graticule and the noise is 0 to 5 db)
NO I/Q automatic action (there is no action on the Phase and Gain
displays and no change of the images that are 1/1 on both sides of
the center dc freq.)
Tried I/Q and Q/I withh no apparent change.
The gain setting for line input on the mixer have no control on the
levels (so I thought it may be at max gain all the time with no
control so added a 20 db resistor attenuator on the line
inputs,didn't change a thing, signal still saturates at same approx.
S 7-8 level.
The same exact setup works fine on PowerSDR SharpDsp and SDradio.
The soundcard is a Creative audigy 2 NX (USB)
Tried it on a IMic (also USB) same results.
Well,I'll wait some more...
73 de Joe.
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"Rocky" working great while PC is busy.
An interesting item about the "Rocky" software, I was in the middle of setting up an new PC but I already had the Rocky software installed.
I was installing C# from Microsoft and also copying about 6 Gigs of files from another PC, running email, and surfing the web, needless to say the PC was busy running about 40% to 75% utilization. Just for fun I decided to run the Rocky software, and while the PC is busy as could be, it would not skip a bit, it's sitting here working great.
I sure wish the source was available, I wouldn't have to mess around with C#, just fire up good old Delphi, and tweak away.
Cecil Bayona
KD5NWA
www.qrpradio.com
I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
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Re: WDM drivers for soundcards
Hello All,
Not really understanding what you all are referring to, I searched for "WDM and sound cards"
Here is the result from Microsoft. for XP though
Note I hope to be able to run rocky on a 98se system ot trying to understand why it
should not run
73 Rein W6/PA0ZN
|
Here it is.
BTW
Running a SoundMax Integrated Digital Audio card here on an ASUS P4P800D motherboard with 2.4 GHz CPU and 512 MB of ram, Windows XP Pro SP2.
Alex, VE3NEA wrote:
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Bill,
If you are using Rocky V.1.02 and still cannot see your soundcard in the list, please generate the WdmView log and send it to me. The log generator is at
73 Alex VE3NEA
Alex,
Did that, but got same error message. Rocky does show the correct sound
card that I have, though.
Bill
Yahoo! Groups Links
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Hi Kees,
The version number is shown in the About box.
73 Alex VE3NEA
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I'm still trying to get the Rocky code to run with this Santa Cruz sound
card since Rocky requires so much less CPU power when compared to the
PowerSDR (which runs fine) and I'd very much like to have a "portable"
SR-40. How do I tell the difference between the V1.02 and earlier
versions ? The downloads I have made all look the same ?
73 Kees K5BCQ
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Bill,
If you are using Rocky V.1.02 and still cannot see your soundcard in the list, please generate the WdmView log and send it to me. The log generator is at
73 Alex VE3NEA
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Alex,
Did that, but got same error message. Rocky does show the correct sound
card that I have, though.
Bill
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Alex,
Did that, but got same error message. Rocky does show the correct sound card that I have, though.
Bill
Alex, VE3NEA wrote:
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Bill,
Click on View / Settings in Rocky, then tick the 48 KHz radio button and click on OK.
73 Alex VE3NEA
How do I change the sampling rate? I don't know much about sound cards.
Bill
Yahoo! Groups Links
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Bill,
Click on View / Settings in Rocky, then tick the 48 KHz radio button and click on OK.
73 Alex VE3NEA
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How do I change the sampling rate? I don't know much about sound cards.
Bill
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Good Evening All,
I am testing a two switch QSD circuit for use in the v5.0 SoftRock.
The switches in the QSD are each on for 50% of the clock cycle and
staggered by 90 degrees. All other circuits in this test version of
the SoftRock are the same as the v4.0 SoftRock.
In the present v4.0 SoftRock there are four switches with each
switch on for 25% of the clock cycle. Two switches, staggered by 180
degrees, connect alternate ends of transformer T1,(+/-RF), to the I-
signal integrating cap. In the same maner but 90 degrees offset from
the I-clocking, two switches provide the input to the Q-signal
integrating cap. Typical performance with the v4.0 is a noise
baseline of about -139dBm when PowerSDR is calibrated for -73dBm at
50uV RMS.
With this two switch QSD SoftRock I am seeing a 3dB decrease in
signal strength compared to a v4.0 when checking with a -73dBm
source. The noise baseline comes up to -135dBm when PowerSDR is
calibrated with the two switch QSD to -73dBm. Some loss of
sensitivity but still a MDS on the order of -131dBm.
Still working on the schematic for the v5.0 SoftRock, but hope to
have it ready to post soon.
73,
Tony KB9YIG
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Thank you Glen - and all others who sent me the WdmView logs. I made a few corrections to the code based on those logs, and I hope v.1.03 will fix the problems like the one you have reported.
Please note that you must close (not just stop) all other programs that use your soundcard before you start Rocky, WDM streaming does not allow device sharing. If you try running Rocky when the soundcard is busy, you will see the "Unable to start output to..." message.
73 Alex VE3NEA
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When selecting the start receiver, I get this message.
"Unable to start output to SoundMax Digital Audio"
Downloaded v1.02 with same results.
What am I doing wrong?
Thanks.
gr
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How do I change the sampling rate? I don't know much about sound cards.
Bill
Alex, VE3NEA wrote:
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Hi Bill,
Can run the PowerSDR test wav files and both PowerSDR and SDRadio can
pick the CW audio up OK. But Rocky gives an error message, "Input
Device Does Not Support Selected Parameters".
Try a lower sampling rate, it looks like your card does not support the parameters that you selected.
Is it possible to test
Rocky just off of a wave file?
I am working on wav recording and playback. The wav component that I wrote a few years ago needs an update - 24-bit cards were not available at that time ;-)
If you have two sound cards, you can connect them with a cable, play your WAV in Media Player, and receive it in Rocky.
73 Alex VE3NEA
Yahoo! Groups Links
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Hi John,
{
Version 1.02 will start with this card, however, the sound is quite muffled and sound is distorted. Also, strangely enough, the program recognizes only one side of the cards input, or in other words, the left channel only. Therefore, the automatic I Q function will not correct, nothing plots. This card will operate with the other Softrock programs and the I Q will correct out.
}
Please see if you can correct this by playing with the soundcard settings in the Control Panel. Change the gain and balance settings for Line In. Unlike more sophisticated programs, Rocky does attempt to set these values programmatically.
Rocky 1.03 is almost ready, it includes a number of fixes that may solve thie problem if it is a software problem.
73 Alex VE3NEA
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Hi Bill, Can run the PowerSDR test wav files and both PowerSDR and SDRadio can
pick the CW audio up OK. But Rocky gives an error message, "Input
Device Does Not Support Selected Parameters". Try a lower sampling rate, it looks like your card does not support the parameters that you selected. Is it possible to test
Rocky just off of a wave file? I am working on wav recording and playback. The wav component that I wrote a few years ago needs an update - 24-bit cards were not available at that time ;-) If you have two sound cards, you can connect them with a cable, play your WAV in Media Player, and receive it in Rocky. 73 Alex VE3NEA
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Alberto I2PHD
Alex, VE3NEA