Tim, I just received the 5000A from Flex yesterday and they recalibrated both receivers after repairing RX2. Furthermore both receivers show exactly the same reading when connected to my a signal generator as long as the input level is above the noise floor of RX2 ie -114dBm. The problem is on signals in the -114 to -124 dBm range. Any ideas???
73's Mark NU6X -----Original Message----- From: Tim Ellison [mailto:telli...@itsco.com] Sent: Wednesday, March 11, 2009 12:49 PM To: Mark Mumaw; FlexRadio reflector Subject: RE: [SPAM] [Flexradio] Help - RX2 Noise floor test You need to run the RX1 and RX2 level tests to calibrate the both receivers to the same signal levels. http://kc.flex-radio.com/KnowledgebaseArticle50140.aspx -Tim -----Original Message----- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Mark Mumaw Sent: Wednesday, March 11, 2009 3:25 PM To: FlexRadio reflector Subject: [SPAM] [Flexradio] Help - RX2 Noise floor test I just recently sent in my 5000A in for some minor warranty work. Flex's service was excellent!! I still has one problem that maybe is just the nature of the beast. My noise floor is 8 to 10dbm higher on RX2 is sharing the same antenna by setting it's antenna to RX1 Tap. It would be very helpful if a few people would run the following test. It requires RX2 and the new Hrfio board. Set both Preamps on and both to the same filter width (ie USB 2.7). Using the Antenna Selection window set Receiver 1 to N/C and compare the S-Meter readings with Receiver 2 set to RX1 Tap and then N/C. Check this on several bands. I find that RX2 has a 8-10dbm higher noise floor while on RX1 Tap but is similar when on N/C. ie -123dBm for N/C but -114dBm on Rx1 Tap. This problem shows up in real life on a quite band and both RX1 and RX2 are connected to the same antenna (RX2 by using RX1 Tap) . I can hear weak signals on RX1 that are just above the noise floor that I can NOT hear on RX2. Please note that this is NOT a problem when the noise level of the band is higher than the noise floor of the receiver 2 or if I am using two different antennas. Thanks and 73's Mark NU6X ` _______________________________________________ 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://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.10/1995 - Release Date: 03/11/09 08:28:00 _______________________________________________ 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://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
