Consulting now, the book of armaments, errr, UHD manual:
http://files.ettus.com/manual/page_dboards.html#dboards_rfx
The RFX series has no TX RF gain control, output magnitude is entirely dependent on baseband magnitude.
There's 70dB of gain range on RX, however. So, crank up the RX gain.
Also, across 1m, the path loss is about 40dB at 2.5GHz, your TX is probably putting out 5dBm, so at the RX end, that's maybe as much as -35dBm. If your RX is set properly, should be enough to see the signal.
On 2015-10-26 15:46, Marcus Müller wrote:
Hi!
* looking at your constellation, relief comes setting in: It looks pretty circular to me; notice how the axes are scaled differently. So no catastrophic IQ imbalance. * the fact that it's circular and not a line is probably the result of the constellation sink not being able to achieve timing synchronization, i.e. it doesn't "know" when a symbol starts * You're right, RX SNR is terrible. However, RX power is very little indeed * Rule of thumb: if(not clipping && in doubt) increase gain; * What exactly is your "RF channel": antennas, direct cable with attenuator? * The mistake I do every few months: Did you connect the antenna/cable to the wrong SMA port?
Best regards, Marcus
On 26.10.2015 20:33, Washbourne, Logan wrote:
I looked at the spectrums of both sides and the RX side looks to be inundated with a lot of noise. I'm not sure if its my environment or my USRPs, but I really expected to see some resemblance of a signal. I am posting links to screencaps of the TX and RX sides. http://imgur.com/GBTHw8T- TX http://imgur.com/DBy8gqs - RX
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