"I wonder if this has come up now due to the Errata sheet that came with V2.0. Item 6 talks about adjusting the IF, but I don't remember earlier documents mentioning it. It could be that most folks didn't realize you could change the IF, and have made adjustments without knowing the effect of moving the LO into the passband."
It didn't come up because it fit into the category of "out of sight, out of mind". This only became an issue because the FLEX-150 runs at a max sampling rate of 48K and at that sampling rate with a 9 KHz IF, the panadapter is skewed in respect to the VFO center frequency. Also the DDS "leakage" through the QSD in the FLEX-5000 and FLEX-3000 is less than the FLEX-1500. -Tim -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Alfred Green Sent: Monday, July 12, 2010 1:26 PM To: [email protected] Subject: Re: [FlexEdge] Flex-1500 spur Tim Ellison wrote: > I set the IF to 3 kHz and it is audible on both LSB and AM. > > Yes, that is true (which is why I asked about the operating mode). Gerald > sent out an e-mail previously explaining that and what the future fix will be > for it (swapping the IF (+/-) depending on operating mode) > > > Just for info, this is present on the F3000 also. If I deliberately set the IF such that the LO is in the passband I can hear it, but the recovery time is faster so it sounds more like a 'ping' than a carrier. It's more noticeable on the 1500 as the correction is slower. As I never use a BW more than 2.7k on any mode, I just set the IF to 3000Hz and have no problems anywhere. I wonder if this has come up now due to the Errata sheet that came with V2.0. Item 6 talks about adjusting the IF, but I don't remember earlier documents mentioning it. It could be that most folks didn't realize you could change the IF, and have made adjustments without knowing the effect of moving the LO into the passband. 73 Alf NU8I _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software development and experimentalist who are using alpha and beta versions of the software. _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software development and experimentalist who are using alpha and beta versions of the software.
