[aprssig] 9600 Baud East Coast Backbone

John D. Hays john at hays.org
Thu Aug 18 11:13:49 CDT 2016


>From the ARRL site

1.25 Meters

The FCC has allocated 219-220 MHz to amateur use on a secondary basis. This
allocation is *only* for fixed digital message forwarding systems operated
by all licensees except Novices. Amateur operations must not cause
interference to, and must accept interference from, primary services in
this and adjacent bands. Amateur stations are limited to 50 W PEP output
and 100 kHz bandwidth. Automated Maritime Telecommunications Systems (AMTS)
stations are the primary occupants in this band. Amateur stations within
398 miles of an AMTS station must notify the station in writing at least 30
days prior to beginning operations. Amateur stations within 50 miles of an
AMTS station must get permission in writing from the AMTS station before
beginning operations. The FCC requires that amateur operators provide
written notification including the station's geographic location to the
ARRL for inclusion in a database at least 30 days before beginning
operations. See Section 97.303(e) of the FCC Rules.

The Bridgecomm BCM-220 unit operates in this band without modification
(albeit without the 100 KHz channel bandwidth)
https://www.bridgecomsystems.com/collections/mobile-radios/products/bcm-220-mhz-mobile-radio
 -- as long as the other requirements are met, it would be a good backbone
for VHF.

On Thu, Aug 18, 2016 at 5:41 AM, Ev Tupis via aprssig <aprssig at tapr.org>
wrote:

> It is a shame that 219 to 220 MHz (all digital allocation) is not
> available in most of the USA.
>
> Alternatively, maybe it's time to petition the FCC to identify 147-148 MHz
> as a 1-MHz wide digital only allocation. lol
>
>
> ------------------------------
> *From:* Robert Bruninga via aprssig <aprssig at tapr.org>
> *To:* TAPR APRS Mailing List <aprssig at tapr.org>
> *Sent:* Wednesday, August 17, 2016 11:34 PM
> *Subject:* [aprssig] 9600 Baud East Coast Backbone
>
> We are dreaming of a 9600 baud East coasst packet backbone along the route
> of the APRS Golden Packet event.  http://aprs.org/ec9600net.html
>
> I wonder if the 5W 220 MHz HT featured in QST this month would make a
> possible radio.  Many of these sites are high and adjacent to plenty of VHF
> and UHF commercial rigs.
>
> Does that mean the 220 MHz is relatively free of front end overload at
> most commercial sites?
> Could just a simple 1/4 wave coax stub bring the RF levels down to
> workable levels?
>
> The radios are 5W and show 0.16uv sensitivity for $85.  Moving the
> backbone to 220 coiuld then allow either 2m or UHF for local user access to
> the backbone.  I had wanted 50W rigs for the 10 dB margin, but maybe 5W
> will do some of the links.
>
> I have zero experience with 220, so I thought I would ask here.
>
> What is the channel we can use on 220 band for 9600 baud packet?
>
>
> Bob, WB4APR
>
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-- 

------------------------------
John D. Hays
K7VE

PO Box 1223, Edmonds, WA 98020-1223
   <http://k7ve.org/blog>  <http://twitter.com/#!/john_hays>
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