[MVMA] 5655 MHz channel 131 at 10 MHz bandwidth? #550

[Chuck Gelm]

It seems that of discovered 20 MHz bandwidth devices (WiFi scans),
~90% use channels between 149 and 165.

Nightly Build #1728 adds another 10 MHz to channel selections on 5 GHz.

With the possible loss of 3 GHz, former 3 GHz links will need to move to 
5 GHz.
This creates additional crowding on 5 GHz. Another channel selection is 
helpful.

Channels above 175 are beyond the advertised bandwidth of the current's 
specifications.

It may be wise to avoid the 'U-NII Upper / U-NII-3' segment, 
5.725-5.850 GHz, 1 Watt/200W-EIRP.
(Channels 145<>170)

  Our in-use devices seem to have a TX power drop-off above 'USA-5835 
MHz, INT-5875 MHz'.
Likely, the radios are identical and only the manufacturer's firmware 
restricts frequency selections.
Likely, the suspected power roll-off is identical among -USA and -INT 
versions.

  I have loaded Nightly Build 1728 on my 5 GHz PtP links and, so far, 
they perform well on
channel 131/132.

Chuck

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