PureSignal performance on 6M
Posted: Mon May 07, 2018 2:31 pm
Scott,
Thanks for redirecting me ... I remember reading this some time ago but at that time didn't have anything other than a casual interest.
So - looking at the schematic. Alex isn't used for TX! THAT was my confusion and why I kept saying "if OFF FCC certs would not be met". It is only a, as you note here and as I have confirmed going over the schematics, a preselector.
Also - reading what you have here - so if one does nothing but turn ALEX off on the front - or set MANUAL instead of FIRMWARE on the BPF1/LPF1 page, items 2 and 3 are exactly the same - correct?
If so then why do I see a change in my IMD performance when I turn ALEX off? If nothing is different - if the same filters are in place - why is it that my 2 tone test shows -12db with ALEX ON and -31 with it OFF (25W, PSA off)? My apologies for being what must have seemed discombobulated since it hasn't been answered - that is the question I've been trying to get addressed so far to no avail. [this is still about ALEX - but regards testing on 6 meters using an 8000DLE]
if not the same what else is different that could again address why for me turning ALEX ON makes the IMD much worse?
Gary
Thanks for redirecting me ... I remember reading this some time ago but at that time didn't have anything other than a casual interest.
So - looking at the schematic. Alex isn't used for TX! THAT was my confusion and why I kept saying "if OFF FCC certs would not be met". It is only a, as you note here and as I have confirmed going over the schematics, a preselector.
Also - reading what you have here - so if one does nothing but turn ALEX off on the front - or set MANUAL instead of FIRMWARE on the BPF1/LPF1 page, items 2 and 3 are exactly the same - correct?
If so then why do I see a change in my IMD performance when I turn ALEX off? If nothing is different - if the same filters are in place - why is it that my 2 tone test shows -12db with ALEX ON and -31 with it OFF (25W, PSA off)? My apologies for being what must have seemed discombobulated since it hasn't been answered - that is the question I've been trying to get addressed so far to no avail. [this is still about ALEX - but regards testing on 6 meters using an 8000DLE]
if not the same what else is different that could again address why for me turning ALEX ON makes the IMD much worse?
Gary