On 26/06/2017 19:16, Jim Brown wrote:
On Mon,6/26/2017 11:07 AM, Bill Somerville wrote:
BTW the definition of narrow band digital modes is problematic as
region 3 defines NB as not exceeding 2kHz bandwidth even though it
shares spectrum with SSB which is allowed up to 6kHz b/w. That means
region 3 cannot use MSK144 (>2.4kHz b/w) in sections allocated to
narrow band digital (NB). Therefore in region 3 MSK144 on 6m would
have to be above 50500 amongst the other wide band (WB) users like
FM. As such a KL7 to Asiatic Russia digital MS contact would have to
be cross frequency!! That seems rather unreasonable but that is where
we currently are.
That's a great example that exposes issues with the IARU allocation
and coordination process. And these are often issues that take decades
to be worked out.
Hi Jim,
it seems that individual country region 3 band planners have already
addressed this issue, for example Iizumi, JG1APX, has sent me a JA band
plan (amended 5th Jan 2015) which expands the NB bandwidth (narrow
bandwidth) from the IARU region 3 general "no greater than 2kHz" to "up
to 3kHz" for bands above 160m. So at least in JA MSK144 is usable in NB
Data sub-bands.
73
Bill
G4WJS.
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