Re: [Flexradio] AGC and Other Optomized Receiver Settings
I tried searching the TT site using various combinations of the (un-specific) cite you made. For us other dummies, would you mind providing a link? -AA5J At 12:21 AM 12/18/2006, [EMAIL PROTECTED] wrote: AGC Optimized (optomized,sic) for what ? Pretty soon I am going to be forced to re-quote here the excellent article that was written for the TT Orion owners manual (you can download it from the TT site) regarding optimizing SDR AGCs for various and subtley different band conditons. It should be re-quoted, paraphrased. plagiarized, what-have-you and included in the Flex knowledge base. Should be a highly recommended read (required) for all Flexers. -K6KDK - Original Message - From: Gerald Capodieci [EMAIL PROTECTED] To: flexradio@flex-radio.biz; [EMAIL PROTECTED] Sent: Sunday, December 17, 2006 3:34 PM Subject: [Flexradio] AGC and Other Optomized Receiver Settings I. M-Audio Software Changes 1. DMA buffer to 1024 2. Codec Sample Rate: Uncheck the Rate Locked box and the --etc.etc.etc.. ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] AGC and Other Optomized Receiver Settings
Here is an article by Sinisa YT1NT which describes how the Orion AGC works and how to set it up. The Orion is close to the SDR in the way the RX works. The Orion uses a single conversion RX through a roofing filter before demodulation to 11 khz and then sending that signal to a DSP unit. The SDR is direct conversion through a Tayloe detector and then IQ signals at 11 khz to a DSP unit (sound card). As such they share a good deal of homogeneity in their design philosophy, so reading some of the theory Sinisa discusses should give a good conceptual overview of how to adjust the SDR for a given band and a given set of band conditions. Also read Gerald's QEX articles. http://www.geocities.com/va3ttn/UsingOrionRX.pdf http://www.arrl.org/tis/info/pdf/020708qex013.pdf http://www.arrl.org/tis/info/pdf/020910qex010.pdf http://www.arrl.org/tis/info/pdf/021112qex027.pdf http://www.arrl.org/tis/info/pdf/030304qex020.pdf 73 W9OY __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] AGC and Other Optomized Receiver Settings
Thank you. This can be very helpful. I know the settings have to do with a person's particular taste as per the KB article by Phil Harman VK6APH on this subject. I was hoping that eventually we can figure out how to set up profiles for different operating styles. Perhaps something like, weak signal, contest, rag chewing or somesuch. The KB article was a bit deep and even though I read it a few times still cannot tell the difference when I change the settings on the console. Additionally, band conditions have been so bad that I barely have any signals out there to experiment with. Edwin Marzan AB2VW From: [EMAIL PROTECTED] on behalf of Gerald Capodieci Sent: Sun 12/17/2006 6:34 PM To: flexradio@flex-radio.biz; [EMAIL PROTECTED] Subject: [Flexradio] AGC and Other Optomized Receiver Settings I. M-Audio Software Changes 1. DMA buffer to 1024 2. Codec Sample Rate: Uncheck the Rate Locked box and the Reset Rate When Idle box. 3. Variable Signal Levels: Outputs= -10dBv, Ins1= +4, Ins2= +4, Ins3= -10 In upper left hand corner of the PowerSDR main screen click the 'Setup option. II. Audio Tab PowerSDR Software: Buffer = 1024 III. DSP Tab V. Options Tab: 1. NR: Taps = 90, Delay = 20, Gain = 50, Block LMS is checked 2. Buffer Size = 1024, Window = Hanning, Noise Blanker = 20, Noise Blanker 2 = 14 VI. AGC Changes 1. Go back to the AGC Button on Main Screen set to Custom and the Preamp = Med, Audio ~ 75 2. Click the Setup tab on the main screen followed by the DSP tab. 3. Then Click 'AGC/ALC tab, set Slope(db) = 3, MaxGain~ 75 (this also changes the gain on Main Screen), Attack= 4, Decay = 10, Hang= 140, Hang Threshold= all the way to the left. VIII. Optional Filter Settings Suggest below matrix of settings I suggest an an arbitrary button-labeling convention to indicate its underlying settings. The first number is the band pass width; the second is the low cutoff. Example: [ 4 .1 ] has a band pass of 4 KHz and a low cut off of 100 Hz. 1. On the main screen, lower right, right click any one of the filters buttons and select Configure. This brings up a screen that allows the individual filters to be reconfigured. Adjust the High and the Low cutoffs, the Width (band pass) on the bottom will adjust it self. CAUTION: the database can take only a limited number of settings at once, perhaps 10. Then it locks showing a memory exception causing all previous settings to be lost. To prevent the loss, Exit the software completely periodically to automatically save current work 2. I'm using the following matrix of filter settings: [4.3][4 .2][4.1] [3.3][3 .2][3.1] [2.3][2 .2][2.1] [1.7 .3][VAR][1.7 .1] I start with [3 .2] and select around till I find a best fit. Under very high noise conditions such as today, 16Dec2006, during a high sunspot condition [2. .3] seems to be most readable. -- next part -- An HTML attachment was scrubbed... URL: /pipermail/flexradio_flex-radio.biz/attachments/20061217/397953fd/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] AGC and Other Optomized Receiver Settings
AGC Optimized (optomized,sic) for what ? Pretty soon I am going to be forced to re-quote here the excellent article that was written for the TT Orion owners manual (you can download it from the TT site) regarding optimizing SDR AGCs for various and subtley different band conditons. It should be re-quoted, paraphrased. plagiarized, what-have-you and included in the Flex knowledge base. Should be a highly recommended read (required) for all Flexers. -K6KDK - Original Message - From: Gerald Capodieci [EMAIL PROTECTED] To: flexradio@flex-radio.biz; [EMAIL PROTECTED] Sent: Sunday, December 17, 2006 3:34 PM Subject: [Flexradio] AGC and Other Optomized Receiver Settings I. M-Audio Software Changes 1. DMA buffer to 1024 2. Codec Sample Rate: Uncheck the Rate Locked box and the --etc.etc.etc.. ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
