NQ5T wrote:
>numbers for IMDDR3 and IP3, while good, aren't
particularly impressive given the fairly high MDS compared to most other
radios without the preamp on. Sort of a "desense the radio and all the
other specs will look better" approach.
This is a very good point Grant. It appears
both VRF and MicroTune act as attenuators in addition
to whatever selectivity they provide. Of course
attenuation also directly improves IMD and BDR.
ARRL should make some attempt to normalize the
IMD and BDR results for a given MDS sensitivity, so
that readers are not misled by results with vastly
different sensitivity settings. I'm copying KC1SX
who does the ARRL Expanded Test Reports. He may want
to consider this point in future reviews, and it
definitely SHOULD have been discussed by ARRL in the
QST article. Specsmanship at its finest...
73, Bill W4ZV
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