Note that the XVTR inputs go through the same RX filters as the other antenna inputs on the FLEX-5000.
Eric Wachsmann FlexRadio Systems > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > radio.biz] On Behalf Of ROger Rehr > Sent: Tuesday, October 16, 2007 3:39 PM > To: Dale Boresz > Cc: flexradio@flex-radio.biz > Subject: Re: [Flexradio] XVRX Input Port on Flex-5000 > > HI, Dale, > > Thanks for the note! > > Answers below: > > > Have you tried connecting a 50 Ohm terminated BNC plug directly to the > > XVTX/COM and XVRX ports so that you don't have a piece of coax acting as > > a possible antenna? Do you still see the noise? Is it real noise, or are > > they spurs (does toggling 'SR' on PowerSDR change their position?) > > I am sorry that I was not clear on this point. The noise is only there > if coax is connected. This is why I know that the source is external > to the Flex5000 and why I believe a lack of bandpass filtering of the > XVRX port explains the difference between the XVRX port and the other > two ports. I never meant to imply that the signals were generated > within the Flex5000. That is clearly not the case. > > The spurious signals ARE changed in frequency by toggling "SR" on and > off. I have added appropriate images to my webpage showing this > frequency change at the bottom of the webpage whose URL I previously > posted. I have added a total of 4 images. These include PowerSDR > images of the noise with SR on and off, and with the FT1000MP [whose > antenna ports are connected to nothing except for a dummy load] on and > off: > > http://www.nitehawk.com/w3sz/flex5000-xvrx.htm > > I got rid of another two spikes in the XVRX spectrum when I turned off > the external Yaesu FP-29 switching power supply for the FT1000MP. I > didn't post a picture of that. > > -- > 73, > > Roger Rehr > W3SZ > http://www.nitehawk.com/w3sz > > > > > > Roger Rehr > W3SZ > http://www.nitehawk.com/w3sz > > > _______________________________________________ > 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 Knowledge Base: http://kb.flex-radio.com/ > 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 Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
