by Skip
This page combines some useful information about common 2-way radios, including CB, UHF and HF-Marine radios, detailing their frequencies, channels, and uses of those channels. It also contains the Phonetic Alphabet, Morse code, and some useful statistics relating to antenna tuning.
Modes of transmission:
AM Amplitude Modulation
FM Frequency Modulation
SSB Single side band (encorporating LSB and USB)
LSB Lower side band
USB Upper side band
CW Continuous Wave (Morse code, On/Off)
OFFICIAL PHONETIC ALPHABET and Morse code:
| 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 0 ----- |
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 5 ..... |
Guide to tuning 2-Way Radio Antenna:
|
PERCENT POWER INTO ANTENNA | COMMENTS |
1:1 |
100% | Perfect |
1.05:1 |
99.93% | Excellent |
1.1:1 |
99.78% | Excellent |
1.2:1 |
99% | Very Good |
1.5:1 |
96% | Good |
2:1 |
88% | Improve if possible |
2.5:1 |
82% | Improve if possible |
3:1 |
75% | Bad - risk damage |
HF Citizen Band (27MHz) Frequency / Channel chart:
Freq. Old Channel Usage
(MHz) Ch#
26.965 - 1 AM
26.975 - 2 AM
26.985 - 3 AM
26.985 - -
27.005 - 4 AM
27.015 (1) 5 AM
27.025 (2) 6 AM
27.035 (3) 7 AM
27.045 - -
27.055 (4) 8 AM ROAD CHANNEL / TRUCKERS
27.065 (5) 9 AM/SSB EMERGENCY (LEGAL)
27.075 - 10 AM
27.085 (6) 11 AM CALLING (LEGAL)
27.095 (7) - AM
27.105 (8) 12 AM
27.115 (9) 13 AM
27.125 (10) 14 AM
27.135 (11) 15 SSB
27.145 - -
27.155 (12) 16 LSB CALLING (LEGAL)
27.165 (13) 17 SSB
27.175 (14) 18 SSB
27.185 (15) 19 SSB
27.195 (16) - SSB
27.205 (17) 20 SSB
27.215 - 21 SSB
27.225 (18) 22 SSB
27.235 - 24 SSB (This isn't a typing
27.245 - 25 SSB error. Channel 23 is
27.255 - 23 SSB out of sequence)
27.265 - 26 SSB
27.275 - 27 SSB
27.285 - 28 SSB
27.295 - 29 SSB
27.305 - 30 SSB
27.315 - 31 SSB
27.325 - 32 SSB
27.335 - 33 SSB
27.345 - 34 SSB
27.355 - 35 LSB DX CALLING CHANNEL
27.365 - 36 SSB
27.375 - 37 SSB
27.385 - 38 SSB
27.395 - 39 SSB
27.405 - 40 SSB
27.620 COMMON WALKIE TALKIE CHANNEL
HF Marine BAND (27MHz):
| MHz | Ch# | Usage |
| 27.680 | Commercial organizations, Ship-shore / intership | |
| 27.720 | Professional fishermen, Ship-shore / intership | |
| 27.820 | Professional fishermen, Intership | |
| 27.860 | 1 | Secondary distress, Safety / weather info, Amateur organizations |
| 27.880 | 2 | Emergency channel, Prioroty distress |
| 27.900 | 4 | General, Ship-shore, Amateur organizations (Calling and working) |
| 27.910 | 5 | General, Ship-shore, Amateur organizations (Calling and working) |
| 27.940 | 6 | Club events, Ship-shore / intership (Calling and working) |
| 27.960 | Amateur organizations, Intership | |
| 27.980 | Surf rescue |
UHF Citizen Band (476MHz)
| Freq. Channel Usage 476.425 1 FM Repeater output |
Freq. Channel Usage 476.925 21 FM |
These pages were last
updated on 23rd Jan 2000.
Hits since 14th October 1998: