Digital%20Modes%20from%20VHF%20to%20Light

1
Digital Modes from VHF to Light

• by Rex Moncur VK7MO

2
Topics Digital Modes

• Meteor Scatter FSK441
• Portable EME on 432 MHz JT65b
• 10 GHz grid squares JT65c ISCAT-A
• 10 GHz QRP EME JT65c
• 24 GHz portable JT65c
• Crossing Bass Strait on Red light - WSC

3
Why Digital?

• Compared to the noise in a normal SSB passband
• SSB around 0 dB
• CW -12 dB
• JT65 -28 dB
• WSC -47 dB
• FSK441 around 2 dB in a fraction of a second

4
Meteor Scatter on 2 Metres
5
Portable EME on 432 MHz
6
10 GHz grid squares
7
(No Transcript)
8
(No Transcript)
9
Distance (km) on Tropo and Aircraft Scatter
10
Distance (km) by Mode
11
10 GHz EME with VK3XPD
12
Db Df Spread 115700 1 -28 1.5
-27 10 VK7MO VK3XPD QF22 0 10
37 115900 0 -28 1.4 -27 8 VK7MO
VK3XPD QF22 0 10 34 120100 0 -31
1.5 -27 22 VK7MO VK3XPD QF22 0
8 32 120300 1 -28 1.6 -24 9
VK7MO VK3XPD QF22 ? 0 2 30 120500 1
-28 1.5 -24 11 VK7MO VK3XPD QF22
0 10 29 120700 1 -27 1.6 -27 6
VK7MO VK3XPD QF22 0 8 27 120900 2
-26 1.5 -27 9 VK7MO VK3XPD QF22
0 10 25 121100 1 -27 1.5 -27 8
VK7MO VK3XPD QF22 0 10 23 121300 2
-24 1.5 -24 8 VK7MO VK3XPD QF22
0 10 21 121500 2 -25 1.5 -24 10
VK7MO VK3XPD QF22 0 10 19 121700 3
-23 1.5 -24 8 VK7MO VK3XPD QF22
0 10 17 121859 3 -22 2.1 -24 8
VK7MO VK3XPD QF22 0 10 16 122059 5
-22 2.1 -24 8 VK7MO VK3XPD QF22
0 10 14 122259 5 -23 2.1 -24 7
VK7MO VK3XPD QF22 0 10 12 122459 2
-23 2.1 -22 7 VK7MO VK3XPD QF22
0 10 10 122659 4 -23 2.1 -22 6
VK7MO VK3XPD QF22 0 10 9 122859 3
-22 2.1 -24 5 VK7MO VK3XPD QF22
1 10 7 123059 4 -21 2.1 -24 6
VK7MO VK3XPD QF22 0 10 5 123259 4
-22 2.1 -22 6 VK7MO VK3XPD QF22
0 10 5 123459 3 -22 2.1 -22 6
VK7MO VK3XPD QF22 0 10 6 123659 6
-23 2.1 -22 6 VK7MO VK3XPD QF22
0 10 7 123859 4 -22 2.1 -22 5
VK7MO VK3XPD QF22 1 10 8 124059 1
-24 2.3 -22 5 VK7MO VK3XPD QF22
0 10 10 124259 4 -22 2.1 -22 6
VK7MO VK3XPD R-30 0 10 12 124459 0
-19 1.0 409 5
14 124859 3 -29
-21 2 73
16 125259 1 -31
-20 1 73
17 125459 4 -29
-22 4 73
19 125659 1 -31 -21
1 73
21 125859 1 -31 -20 3
73
23
13
Spreading (Hz) 121000 0 -29 3.3 -27 41
24 121200
0 -33 1.6 -48 33 22
121400 0 -33 6.3 -27 10 20
121600 0
-33 2.7 -24 2 18
121800  0  -33  2.2  -30 32 
                      17  122000  0  -30  2.2 
-24  5                             15 122200  0 
-33  4.8   57  2                     
13                                    122400  0 
-33  2.2  -27 75                    11 
  122600  0  -33 10.0   48 48                   
10 122800  0  -31  2.1  -24 36   
                        8                        
           123000  0  -33  6.5  -54 29 
                       6                         
              123200  0  -29  2.3  -24 28  
                 5                               
      123400  0  -30  2.2  -24  2              
5                                     123600 
0  -33  3.6  -70 41               
6                                       123800 
0  -28  2.2  -24  5                          7 
                               124000  0  -32 
2.0  -24 33                       
8                                  124000  1  
6/11                   VK3XPD VK7MO -27  ?      
0   1     
14
(No Transcript)
15
Signal/Noise with Spreading
16
Spreading 7MO to 3XPD
17
24 GHz Aircraft Scatter with VK3HZ
Decoded VK3HZ VK7MO QE38
-21 dB
18
24 GHz Nearly 421km VK3HZ
19
King Is 10 and 24 GHz
20
Red Light VK3HZs WSC
21
RXing at Stanley
22
Narrow Beamwidth TX
23
VK7JG TXing at Mt Horror
24
Receiving Tones
25
(No Transcript)
26
CONCLUSIONS

• Digital Modes
• GPS locking
• Accurate pointing
• Lots of Development and Practice
• Reliable Equipment and Operators
• Plenty of Spare time - Retired