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EME with Flex 6600
I am considering the possibility of using my Flex 6600 for EME in the following configuration: .
- 2m 12+12 element Crossed Yagi.
- Dual RX transverter to go with my Flex 6600.
- 2 instances of WSJT-X/Q65 or MAP65/JT65/Q65.
Then came the following message: WSJT-X does not do adaptive pol so running two instances has no advantage. Download MAP65 to do adaptive dual-pol reception. I've been told that Flex dual Rx are not coherent (locked in phase) so MAP65 will not work with it. I suggest you look at teh IQ+, which is a 2m dual-pol SDR. Just connect two LNA and a dual channel soundcard.
In response came the following message from Bill Somerville G4WJS of the WSJT-X team:
there are two aspects to adaptive polarization:
1) two I/Q data sources with stable clocks from 90 degree different polarized sources can be combined using DSP to extract signals at any desired polarization, that allows a search for decodes at different polarizations. MAP65 does this for 0, 45, and 90 degree relative to some arbitrary 0 degree source. Finer polarization resolution is not considered productive as the extra CPU resource has to be offset by the need for decoding within a deadline versus exponentially decreasing decoding gains for smaller polarization increments.
2) a system with synchronized I/Q data streams from 90 degree different polarized sources, if properly calibrated, allows MAP65 to display the absolute polarization of the decoded signals. This allows the best transmit polarization to be chosen to reply with, a significant advantage. The starting point for synchronized I/Q streams is that the I/Q detectors in the radios run from the same reference clock. Further to that the path delays through from aerial receiving elements to the decoding application must be either exactly equal or compensated for by a calibration tool and suitable adjustment (that could be a known signal polarized at 45 degree to the receiving aerials which would have equal strength to both polarizations, MAP65 has a calibration parameter to record the resulting offset and correct for it).
The I/Q+ is a specialized wide band dual I/Q detector with a common reference clock input (LO if you will), that can be used to obtain two exactly synchronized I/Q data streams which can then be fed to a 4-channel sound card like the LinkRF UADC4, which in turn is used for the input to MAP65. Rx frequency conversion would not be required for 2m as the IQ+ is specified for direct conversion between 40MHz and 900MHz, a pair of good quality LNAs in front of the IQ+ would be needed. Tx is another matter.
73 Bill G4WJS.
- Does that mean that Flex 6600 can't be used as a part of a high capacity EME system?
- Please go into this information and tell what's right and wrong.
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