Edwin, Are the SDR-1000, FA66 and the computer all grounded together directly (not through the AC safety ground)? All three components make up the radio and should be at the same ground potential.
-Tim ---- -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Edwin Marzan Sent: Friday, January 11, 2008 8:32 AM To: Jeff Anderson; flexradio@flex-radio.biz Subject: Re: [Flexradio] Mysterious Spur Visible on Panadaptor Hi Jeff, The setup is very simple. Astron VS-20M Power supply, SDR-1000, Eridol FA66, HP Computer, MFJ Tuner (no power supply), Creative Labs Speakers. Switched on and off all other equipment at home and no luck. Receiver is calibrated with Elecraft XG-1. IF was changed from 11.25 (I think) to 9 or somesuch via PowerSDR. Noise level is very high here in the Bronx. I see the same high levels with my other transceivers. I don't see any other patterns other than 1 khz spacing that you noticed on the waterfall display. I'm going to see if my older version of PowerSDR exhibits this same behavior. Thanks for the suggestions!Edwin MarzanAB2VW ===================================================================================================== > Date: Thu, 10 Jan 2008 10:31:17 -0800> From: [EMAIL PROTECTED]> To: [EMAIL > PROTECTED]> CC: flexradio@flex-radio.biz> Subject: Re: [Flexradio] Mysterious > Spur Visible on Panadaptor> > Mike's (w6thw) suggestion is a good one. Switch > off all other equipment > and see if it goes away.> > Also - your noise floor > looks pretty high to me (compared to what I see > on my SDR). What is your > preamp set to? The high noise *may* be > indicative of an incorrectly > calibrated receiver - do you have a good, > calibrated, RF source that you > can use to calibrate the receiver > levels? I'm wondering if these tones are > actually really far down in > level (below the A/D's threshold), but, because > input gain is too high, > they're being digitized by the A/D and appearing as > real (albeit faint) > signals) - but I'm really just guessing here. I don't > know if the > Edirol has a preamp prior to the A/D (many A/D's do), nor if > Flex > controls the gain of this preamp. If not, that is, if gain is only > > applied in software, then this thought is probably wrong - but you may > > still need to calibrate the receiver. > > By the way, if you don't have a > calibrated RF generator that you trust, > Elecraft makes one that is perfect > for something like this (I recommend > that all hams have one).> > If you're > still not having any luck, more clues might be gained by > looking at the > entire panadapter display (zoom all the way out) . Are > there any patterns?> > > Also - what's the IF frequency set to?> > Thanks,> > - Jeff, k6jca> > > > > Edwin Marzan wrote:> > Hmmm.... there is a switching power supply powering > another transceiver nearby. I'll see what happens when I turn it off.> > > > > Thanks for the info.Edwin MarzanAB2VW> >> >> > Date: Thu, 10 Jan 2008 > 09:09:48 -0800From: [EMAIL PROTECTED]: Re: [Flexradio] Mysterious Spur > Visible on PanadaptorTo: [EMAIL PROTECTED]> > Hi are you using a switching > power supply if so try another one and see if it still there.> > Just thought > it might be the same thing i had happen on all bands.> > > > _________________________________________________________________ Put your friends on the big screen with Windows Vista(r) + Windows Live(tm). http://www.microsoft.com/windows/shop/specialoffers.mspx?ocid=TXT_TAGLM_CPC_MediaCtr_bigscreen_012008 _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
