-
Notifications
You must be signed in to change notification settings - Fork 1
/
mb7uar.html
157 lines (130 loc) · 4.85 KB
/
mb7uar.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>HamBSD: MB7UAR APRS IGate</title>
<meta name="description" content="HamBSD MB7UAR APRS IGate">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" href="openbsd.css">
<link rel="canonical" href="https://hambsd.org/mb7uar.html">
<h2 id="HamBSD">
<a href="index.html">
<b>Ham</b><i>BSD</i></a>
MB7UAR APRS IGate
</h2>
<hr>
<img src="mb7uar/mb7uar.jpg" style="float: right; width: 300px;">
<h3>Overview</h3>
<table border="1">
<tr>
<th>Callsign</th>
<td>MB7UAR</td>
</tr>
<tr>
<th>Frequency</th>
<td>144.800 MHz</td>
</tr>
<tr>
<th>Location</th>
<td>Northfield, Aberdeen</td>
</tr>
<tr>
<th>Locator</th>
<td>IO87wd</td>
</tr>
<tr>
<th>Mode</th>
<td>AFSK 1200 APRS</td>
</tr>
<tr>
<th>Gateway</th>
<td>Bi-directional (APRS-IS)</td>
</tr>
<tr>
<th>Digipeating</th>
<td>WIDEn-N</td>
</tr>
<tr>
<th>Looking Glass</th>
<td>in development...</td>
</tr>
<tr>
<th>NoV Issued</th>
<td>5 Nov 2019</td>
</tr>
<tr>
<th>Nov Expiry</th>
<td>4 Nov 2020</td>
</tr>
<tr>
<th>Keeper</th>
<td>MM0ROR</td>
</tr>
</table>
<h3>Usage Instructions</h3>
<p>When in range of MB7UAR, send APRS packets on 144.800MHz. All packets will
be relayed to APRS-IS.</p>
<p>If a position report is sent, it will be possible to establish two-way
messaging between your RF station and either an Internet station or another
RF station linked via another IGate.</p>
<p>To enable RF-to-RF communication locally, MB7UAR may be used as a digipeater.
It will digipeat packets according to the "new n-N Paradigm". In practice, this
means that you should set your path to include at least "WIDE2-1" or at most
"WIDE1-1,WIDE2-1".</p>
<h3>Coverage</h3>
<p>The following map was calculated with some perhaps over-optimistic
assumptions. It is probably more representative for fixed stations than
mobiles, and for handhelds you may struggle. YMMV.</p>
<p>At the time the antenna was installed, the local noise floor was recorded at
around S6.</p>
<p><img src="mb7uar/mb7uar-cov.png" height="200">
<img src="mb7uar/noise.jpg" height="200"></p>
<p>Reports are encouraged and should be sent to <a
href="mailto:irl@hambsd.org">irl@hambsd.org</a> with the subject line "MB7UAR
Report".</p>
<h3>Station Details</h3>
<h4>Controller</h4>
<p>While HamBSD matures, this station is currently controlled by a Raspberry Pi
running Dire Wolf on Raspbian. The following configuration is used:</p>
<pre style="overflow: auto;">ADEVICE plughw:1,0
PTT /dev/ttyUSB0 RTS
TXDELAY 50
MYCALL MB7UAR
# MB7UAR Position Beacon
PBEACON delay=05 every=30 overlay=I symbol="digi" lat=57^09.89N long=002^09.67W comment="Northfield IGate" via=WIDE1-1,WIDE2-1
PBEACON delay=05 every=10 overlay=I symbol="digi" lat=57^09.89N long=002^09.67W comment="Northfield IGate" sendto=IG
# GB3GN Object Beacon
OBEACON objname=GB3GN delay=15 every=30 symbol=/r lat=57^1.0629N long=002^21.5402W comment="145.775MHz T067 -600 Banchory www.grampianrepeatergroup.co.uk" via=WIDE1-1,WIDE2-1
OBEACON objname=GB3GN delay=05 every=10 symbol=/r lat=57^1.0629N long=002^21.5402W comment="145.775MHz T067 -600 Banchory www.grampianrepeatergroup.co.uk" sendto=IG
# GB3NG Object Beacon
OBEACON objname=GB3NG delay=25 every=30 symbol=/r lat=57^36.1319N long=002^1.9699W comment="145.625MHz T067 -600 Fraserburgh www.grampianrepeatergroup.co.uk" via=WIDE1-1,WIDE2-1
OBEACON objname=GB3NG delay=05 every=10 symbol=/r lat=57^36.1319N long=002^1.9699W comment="145.625MHz T067 -600 Fraserburgh www.grampianrepeatergroup.co.uk" sendto=IG
IGSERVER euro.aprs2.net
IGLOGIN MB7UAR *****
DIGIPEAT 0 0 ^WIDE[3-7]-[1-7]$ ^WIDE[12]-[12]$
IGTXVIA 0
IGTXLIMIT 6 10</pre>
<h4>Transceiver</h4>
<p>MB7UAR uses a Yaesu FT-1900 as its transciever. The radio is connected via
a soundcard interface cable connected to its microphone and external speaker
ports. This radio does not have the 5-pin mini-DIN data port that is common
on Yaesu radios.</p>
<p>The transmitter power output is set to 5 watts and uses a "narrow" channel.
The mic gain setting (menu item 27) has been used to set the peak deviation to
2.5kHz.</p>
<h4>Antenna and Feeder</h4>
<p>A simple dipole is installed in the attic. The bracket, support and
elements are made from aluminium.</p>
<p>10 meters of RG58 coax is used to connect the antenna and the radio with
PL259 connecters at both ends.</p>
<p>The reading of SWR from the Yaesu FT-817 is not an accurate reading, but
suggests that the SWR is probably somewhere between 1:1 and 1.5:1. The FT-817
does not actually measure SWR but instead only measures reflected power. This
reading was taken using 5W output.</p>
<p><img src="mb7uar/antenna.jpg" height="200">
<img src="mb7uar/swr.jpg" height="200"></p>
<h4>Internet Gateway</h4>
<p>This IGate has a redundant connection to the Internet, using fixed VDSL and
failover to an LTE connection. It uses the APRS2 European round-robin to select
the server to connect to.
</body>
</html>