XLR-3
(A3M or A3F) Connector Audio:
Pin 1 = Shield
Pin 2 = Audio +
Pin 3 = Audio -
Exceptions: Marti remote pickup
transmitters along with Zercom Max-Z and ZII Remote Broadcast
Telephones have unbalanced audio inputs. Pin 1 is shield, Pin
2 is ground and pin 3 is the audio.
RJ-45 connector pin-outs
found
here.
For air variable capacitors,
.045"
plate spacing = 2kV rating
.075" plate
spacing = 3kV rating .080" plate
spacing = 3.5 KV .125"
plate spacing = 4.5 kV rating.
According to a publication by
Nautel, here
are recommended settings of air arc-gaps when used at a 50 ohm zero
reactance point in an AM transmission system:
|
Radio Frequency: |
Power
Correction: |
|
540 KHz = .159 inches |
1000 watts, multiply
by 1.05 |
|
1000 KHz = .125
inches |
5000 watts, multiply by 1.30 |
|
1700 KHz = .076
inches |
10,000 watts, multiply by
1.83 |
See examples of arc-gaps
here.
Return Loss vs. Voltage
Standing Wave Ratio vs. Reflected Power:
|
Return Loss
|
VSWR |
Power Reflected |
With 10 KW Forward |
|
45
dB |
1.01:1 |
0.003% |
0.3 Watts Reflected |
|
40 dB |
1.02:1 |
0.01% |
1 Watts Reflected |
|
35 dB |
1.04:1 |
0.03% |
3
Watts Reflected |
|
30 dB |
1.06:1 |
0.1% |
10 Watts Reflected |
|
25 dB |
1.12:1 |
0.3% |
30 Watts Reflected |
|
20 dB |
1.22:1 |
1.0% |
100 Watts Reflected |
|
15 dB |
1.42:1 |
3.0% |
30
Watts Reflected |
|
10 dB |
1.92:1 |
10.0% |
1000 Watts Reflected |
|
8 dB |
2.33:1 |
16.0% |
1600 Watts Reflected |
|
5 dB |
3.51:1 |
31.0% |
3100 Watts Reflected |
|
