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FCC's Current Proposal: Temporary continued use of 3.3-3.4 GHz

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FCC's Current Proposal: Temporary continued use of 3.3-3.4 GHz

The FCC released an NPRM in October that further clarifies (but not not yet rules on) continued Amateur use of the 3.3-3.4 GHz portion of the 3.3-3.5 GHz band.  See:

My read is the following:

 - Amateur use of 3300-3500 MHz will sunset (be discontinued) eventually.

 - Amateur use of 3450-3500 MHz portion (the first to be used commercially) can continue until "...the date consistent with the first possible grant of flexible use authorizations to new users in the band, consistent with the timeline for relocation of secondary radiolocation services.". 

 - FCC is asking whether having amateur operations immediately adjacent to commercial at 3450 will be a problem, so they are considering up to a 50 MHz guardband (3400-3450 MHz).

 - Amateur operation between 3300 and 34XX (xx depends on guardband) may continue until "...a future date to be set later in this proceeding.".

The standard off-the-shelf M3 radio has its lower channel center at 3400.0 MHz (CH 80).  Does the AREDN firmware allow use of CH 76-79?   We would likely take a performance hit as Ken found this filter response in the M3 radio:




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