Re: [soft_radio] E-Mu 0202
Hi group, Would it not be feasible to design a way to perform this 'equalization' automatically via software? Regards, Per-Tore On 4 May 2010 22:20, Alberto I2PHD i2...@weaksignals.com wrote: On 5/4/2010 8:34 PM, Garey Barrell wrote: One thing I would add. BEFORE using the software Image Rejection, Fine Tune the GAIN balance by adjusting the Left Channel control for best suppression. Someone else, somewhere, suggested leaving the LEFT GAIN at minimum with the RIGHT GAIN at 10 o'clock. I believe the GAIN controls must be turned up somewhat, otherwise the S/N ratio will be degraded. So it might take some playing with the GAIN controls to get the best s/n ratio, AND equal gain through both channels. Garey, correct, it is best to try to achieve the best balance (read : image suppression) acting on the hardware (Tayloe mixer, post amplifiers and sound adapter controls) with the software adjustments still at zero. Only when you are not able to balance it better, then use what the software offers you to fine tune that balance. Regarding the Gain controls, remember that, as written in the documentation of the sound adapter, those controls adjust the additional gain given to each channel... They must not be regarded as a conventional volume control, where the zero position means that no gain is applied in the E-MU 0202 each channel has a base gain, which is not that low, that can increased, if need be, using the controls on the front of the adapter. So leaving the right channel gain at zero does not incur in a bad S/N ratio. The two channels are slightly different from each other, as one is meant also for the microphone, while the other isn't. That's why it is advisable to increase slightly from the zero position the left channel additional gain. It is too easy to wrongly adjust them so to incur in a bad saturation situation I know... by experience :-( 73 Alberto I2PHD
Re: [soft_radio] Re: Noise from the PC, what should I do about it?
Hi, There are opto-isolated USB hubs available. For example from BB Electronics or Black Box. Per-Tore LA7NO At 19:42 02.01.2008, you wrote: Miura Kazunori wrote: Hello, Adnan I have same problem of thinking schematics. I am making SDR with USB control. A noise arrive through a USB cable. I think that it is necessary to insulate a PC and SDR. But I do not yet understand the method. Does anyone have idea? JA7TDO Kazunori Miura I had a similar problem when interfacing the SDR-X (an SDR radio that did not enter into the market) to the PC via the parallel port. A lot of noise entered the SDR through the parallel cable. The solution was that of using opto-couplers so that to not have an electrical path between the two equipments. Maybe something similar could be designed for the USB port 73 Alberto I2PHD Yahoo! Groups Links __ NOD32 2760 (20080102) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com \\|// /__\ |(O) (O)| oOOO--(_)--OOOo- || | Per-Tore Aasestrand | | E-mail: [EMAIL PROTECTED]| | Tel : +47 55 32 32 35 | | Mobile: +47 920 444 76 | | PO Box 1708 Nordnes | | N-5816 BERGEN| | Norway | || Only recycled bits have been used in this email.
Re: [soft_radio] FAST MICROCONTROLLERS
Hi, I would suggest looking at the powerful Atmel AVR series: http://www.atmel.com/products/AVR/ Free SW development system with full support of the GNU C compiler and with integrated programmer/debugger: http://www.atmel.com/dyn/products/tools_card.asp?tool_id=2725 Plenty of cheap development boards available: http://www.futurlec.com/ET-AVR_Stamp_Tips.shtml http://www.bdmicro.com/mavric-iib/ http://www.embeddedhub.com/development/avr-board/tools.html http://www.ecrostech.com/Products/AvrJtagIce/Intro.htm http://www.mikrovega.pl/1403.php etc. ... Good luck! Per-Tore At 01:11 19.07.2006, you wrote: Hello, I would like to pick you brains on MCUs that are faster that Microchip PIC / DSPIC(40MIPS) or Scenix SX (75Mhz). The packaging could be TQPF or surface mount, using a free/low cost development studio and C compiler. I would like something that would not make fast math unthinkable, but more on the MCU side than DSP. Suggestions, Frank Yahoo! Groups Links __ NOD32 1.1667 (20060718) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com +---+-+ | Per-Tore Aasestrand | E-mail : [EMAIL PROTECTED] | | P.O. Box 1708 Nordnes | Phone : + 47 - 55 32 32 35 | | N-5816 Bergen, Norway | Mobile : + 47 - 920 444 76 | +---+-+ Yahoo! Groups Sponsor ~-- Yahoo! Groups gets a make over. See the new email design. http://us.click.yahoo.com/XISQkA/lOaOAA/yQLSAA/ELTolB/TM ~- Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [soft_radio] SA-3002 SPECTRUM ANALYZER V1.33
Hi, The URL was http://www.dazyweblabs.com until recently. Then the domain subscription expired, and someone else picked it up. So, the poor guy had to find another name. Sh*t happens! ;-) Per-Tore At 10:21 14.07.2006, you wrote: The name are kind of close, NOT. I try to make it a habit of going to the actual web site and copy the URL then paste it, makes errors less frequent, but you still have to watch out for frames. On Friday 14 July 2006 02:01, [EMAIL PROTECTED] wrote: On 14 Jul 2006 at 6:08, [EMAIL PROTECTED] wrote: DAZYWEB LABORATORIES SA-3002 SPECTRUM ANALYZER V1.33 http://www.dazyweblabs.com/ [EMAIL PROTECTED] This is one of the best sound card analyzers I have found and it is freeware with future updates from the site. dazyweblabs.com is a pet food outfit! The correct web page is http://www.infinitespectra.com Dave - WB6DHW Yahoo! Groups Links -- Cecil KD5NWA www.qrpradio.com Yahoo! Groups Links __ NOD32 1.1660 (20060714) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com +---+-+ | Per-Tore Aasestrand | E-mail : [EMAIL PROTECTED] | | P.O. Box 1708 Nordnes | Phone : + 47 - 55 32 32 35 | | N-5816 Bergen, Norway | Mobile : + 47 - 920 444 76 | +---+-+ Yahoo! Groups Sponsor ~-- Yahoo! Groups gets a make over. See the new email design. http://us.click.yahoo.com/XISQkA/lOaOAA/yQLSAA/ELTolB/TM ~- Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [soft_radio] Re: Sorry...
Since we already are fr off-topic: ;-)) I fully agree with you Alberto! The Ferrari Brut is a gem, with its light yellow color with a tint of green. I find it tastes a bit of apples. Mostly from Chardonnay grapes I think. Made by the metodo classico, which implies 2nd fermentation on bottles, and storage for 2 years. Pity it cost EUR 25 for 75 cl here in Norway. Happy New Year to all of you! Per-Tore At 00:40 31.12.2005, you wrote: Hi Johan, oh no, the sweet Asti is mostly for children and women... Cinzano Riserva is a good one, though, as you say, not the absolute best, but a good compromise price-wise. IMHO the best Italian spumante is that produced in the zone around the town of Brescia, the Franciacorta zone (the name is misleading, though it contains the characters Francia, it has nothing to do with the country of Robespierre. Franciacorta means Free Court, a zone of free market [in the middleage]). One of the best brands of that zone is the Ferrari Brut (no relationship with racing cars), which, IMHO, is much better than any French champagne, not to mention the mix of water, sugar and some alcohol produced by the Christian Brothers in California... :-) HNY 73 Alberto I2PHD Johan Bodin wrote: Which brand of bubbly ? I could be interested... Hi Alberto, For ordinary occasions we use Cinzano Riserva (dry of course, not the sweet Asti) as our Standard Bubbly #1A. Not the best but still quite good price/performance ratio. :-) 73 HNY! Johan SM6LKM Yahoo! Groups Links +---+-+ | Per-Tore Aasestrand | E-mail : [EMAIL PROTECTED] | | P.O. Box 1708 Nordnes | Phone : + 47 - 55 32 32 35 | | N-5816 Bergen, Norway | Mobile : + 47 - 92 04 44 76 | +---+-+ Yahoo! Groups Sponsor ~-- Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~- Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [soft_radio] What is the best way in a SDR?
The same is done by RS and WJ. Would there be any benefit in doing the DSP at a higher IF? P-T At 09:54 31.10.2005, you wrote: - Original Message - From: Juan EA7FNJ [EMAIL PROTECTED] To: soft_radio@yahoogroups.com Sent: Sunday, October 30, 2005 11:26 PM Subject: [soft_radio] What is the best way in a SDR? Hi guys. I have a question: What is the best way: - Input the IF signal to a ADC and make all the process by DSP or - Input the I/Q signal from the Tayloe Mixer to a ADC and DSP FWIW, when I worked for Racal they used the first technique. They used a low IF, something like 30 kHz, IIRC. Leon -- Leon Heller, G1HSM [EMAIL PROTECTED] http://www.geocities.com/leon_heller --- [This E-mail has been scanned for viruses but it is your responsibility to maintain up to date anti virus software on the device that you are currently using to read this email. ] Yahoo! Groups Links +---+--+ | Per-Tore Aasestrand | E-mail : [EMAIL PROTECTED] | | P.O. Box 1708 Nordnes | Voice : + 47 - 55 32 32 35 | | N-5816 Bergen, Norway | Mobile : + 47 - 92 04 44 76 | +---+--+ Yahoo! Groups Sponsor ~-- Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~- Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [soft_radio] Re: What is the best way in a SDR?
Undersampling is exactly what I had in mind. However, in my ardour, your point about the SH window slipped my attention. ;-)) Pity! P-T At 12:43 31.10.2005, you wrote: Per-Tore Aasestrand wrote: Couldn't that converter also sample the 455 kHz directly? We are dealing with a BW of just around 10 kHz. The filtering of the signal is usually also quite good. Some receivers have an ultimate rejection of out-of-band signals of more than 90dB. By choosing the sample rate carefully, one ought to be able to avoid troublesome aliasing. Or? While it is true that you can sub-sample, taking advantage of the so-called Nyquist zones, if your signal is bandwidth limited, it must not be forgot that the aperture width of the ADC must be commensurate with the real frequency of the signal. I don't know if that sigma-delta converter has a sample-and-hold front end with a sample width short enough for 455 kHz. After all, it was meant for sampling audio signals. 73 Alberto I2PHD Yahoo! Groups Links +---+--+ | Per-Tore Aasestrand | E-mail : [EMAIL PROTECTED] | | P.O. Box 1708 Nordnes | Voice : + 47 - 55 32 32 35 | | N-5816 Bergen, Norway | Mobile : + 47 - 92 04 44 76 | +---+--+ Yahoo! Groups Sponsor ~-- Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~- Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
