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[Ham-80211] HSMM: 420-430 MHz

Jim Tarvid tarvid at ls.net
Sat Mar 5 03:33:26 UTC 2011


That may not be easy. A couple of special use permits were revoked as "moot"
some time back. Some of this is a matter of administrative review. Do we
have any "pink slips" to analyze?

I'm in. Could be a real incentive for the tech adventurist.

On Fri, Mar 4, 2011 at 10:07 PM, Brian Webster <bwebster at wirelessmapping.com
> wrote:

> Don't get me wrong I am all for the idea of running these OFDM radios. That
> spectrum is underutilized without a doubt. If it has been determined that
> it
> is legal then let's build some networks.
>
> Brian N2KGC
>
> -----Original Message-----
> From: ham-80211-bounces at tapr.org [mailto:ham-80211-bounces at tapr.org] On
> Behalf Of kb9mwr at gmail.com
> Sent: Friday, March 04, 2011 3:34 PM
> To: ham-80211 at tapr.org
> Subject: Re: [Ham-80211] HSMM: 420-430 MHz
>
> Here is some explanation from the QEX article, for those concerned:
>
> In 47 CFR 97.315 the emission type "image" is defined as including
> "emissions having B as the first symbol; 7, 8 or 9 as the second symbol; W
> as the third symbol".
>
> In 47 CFR 2.201 (c) (2) a first symbol of B defines the type of modulation
> of the main carrier as an "emission in which the main carrier is
> amplitude-modulated (including cases where sub-carriers are
> angle-modulated) with independent sidebands". The OFDM modem fits this
> description as it has a central carrier with multiple subcarriers in the
> upper and lower sidebands that are angle (phase) modulated. In 47 CFR 2.201
> (d) (5) a second symbol of 7 indicates that the nature of the signals
> modulating the main carrier are "two or more channels containing
> quantitized
> or digital information". 47 CFR 2.201 (d)(2) and (3) indicate that
> time-division multiplex is excluded for a single channel so the time
> division multiplex inherent in HSMM communications creates two or more
> channels.  In 47 CFR 2.201 (e) (8) a third symbol of W indicates that the
> type of information to be transmitted is "a combination of the above" and
> that includes (4) "facsimile", (5) "data transmission, telemetry and
> telecommand", (6) "telephony" and (7) "television". HSMM fits this
> definition as it includes data, speech and image components.
>
> I am more concerned by underutilized spectrum, and red flags that people
> throw that deter experimentation in the hobby.
>
> That said I have a few extra picture frames and would be fine framing my
> first "pink slip" over silly rules in the name of experimentation.
>
> I firmly believe that the rules will change as we do.
>
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>
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-- 
Rev. Jim Tarvid, PCA
Galax, Virginia
http://ls.net
http://drupal.ls.net
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