I've seen similar issues here, but haven't had time to fully characterize
them. I just noticed something interesting though. If I enable RX2 with
the RX2 preamp turned on, the noise floor is different than RX1. If I then
turn the RX2 preamp off and then back on, both receivers show the same noise
floor. SW bug?
73,
Clay W7CE
----- Original Message -----
From: "Tim Ellison" <telli...@itsco.com>
To: "Mark Mumaw" <n...@esedona.net>; "FlexRadio reflector"
<flexradio@flex-radio.biz>
Sent: Wednesday, March 11, 2009 12:48 PM
Subject: Re: [Flexradio] [SPAM] 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
`
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