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Feature Articles

HF Propagation Predictions - February 2016

Courtesy Chris G3YTU

Download as a .pdf file

Reduction of RFI for the Mobile User

Courtesy Phil M5BTB

Download as a .pdf file

Decibel to Power Conversion Chart for the Radio Amateur

dBW Watts   Watts dBW
         
0 1.0      
1 1.3   1  0.0
2 1.6   2  3.0
3 2.0   3  4.8
4 2.5   4  6.0
5 3.2   5  7.0
6 4.0   10  10.0
7 5.0   15  11.8
8 6.3   20  13.0
9 7.9   30  14.8
10 10.0   40  16
11 12.6   50  17.0
12 15.8   60  17.8
13 20   70  18.5
14 25.1   80  19.0
15 31.6   90  19.5
16 39.8   100  20.0
17 50.1   120  20.8
18 63.1   140  21.5
19 79.4   160  22.0
20 100   180  22.6
21 125.9   200  23.0
22 158.5   240  23.8
23 199.5   280  24.5
24 251.2   320  25.1
25 316.2   360  25.6
26 398.1   400  26.0

 

The Phonetic Alphabet

The NATO Phonetic Alphabet was developed in the 1950s to avoid the misunderstanding caused by poor radio acoustics where an S and an F for example are easily confused.

A - Alpha

B - Bravo

C - Charlie

D - Delta

E - Echo

F - Foxtrot

G - Golf

H - Hotel

I - India

J - Juliett

K - Kilo

L - Lima

M - Mike

N - November

O - Oscar

P - Papa

Q - Quebec

R - Romeo

S - Sierra

T - Tango

U - Uniform

V - Victor

W - Whiskey

X - X-ray

Y - Yankee

Z - Zulu

The R-S-T system

The R-S-T system is used by amateur radio operators, shortwave listeners, and other radio hobbyists to exchange information about the quality of a radio signal being received. The code is a three digit number, with one digit each for conveying an assessment of the signal's Readability, Strength, and Tone.

For non-CW (non Morse code) signals, the Tone (i.e. last) digit is normally omitted.

 

Readability

R1 - Unreadable

R2 - Barely readable, occasional words distinguishable

R3 - Readable with considerable difficulty

R4 - Readable with practically no difficulty

R5 - Perfectly readable

 

Strength

S1 - Faint—signals barely perceptible

S2 - Very weak signals

S3 - Weak signals

S4 - Fair signals

S5 - Fairly good signals

S6 - Good signals

S7 - Moderately strong signals

S8 - Strong signals

S9 - Extremely strong signals

 

Tone

T1 - Extremely rough hissing note

T2 - Very rough AC note, no trace of musicality

T3 - Rough, low-pitched AC note, slightly musical

T4 - Rather rough AC note, moderately musical

T5 - Musically modulated note

T6 - Modulated note, slight trace of whistle

T7 - Near DC note, smooth ripple

T8 - Good DC note, just a trace of ripple

T9 - Purest DC note