Birdies<\/p>\n
Birdies are frequencies your scanner uses when it operates. These
\noperating frequencies might interfere with broadcasts on the same
\nfrequencies. If you program one of these frequencies, you hear only noise
\non that frequency.<\/p>\n
If the interference is not severe, you might be able to turn SQUELCH
\nclockwise to cut out the birdie. The most common birdies to watch for are
\nlisted below.<\/p>\n
Birdie Frequencies:<\/p>\n
31.05 MHz 124.20 MHz
\n41.40 MHz 134.55 MHz
\n51.75 MHz 144.90 MHz
\n113.85 MHz 155.25 MHz<\/p>\n
Reception Notes<\/p>\n
Reception of the frequencies covered by your scanner is mainly “line of
\nsight”. That means you usually cannot hear stations that are beyond the
\nhorizon. During the summer months you may be able to hear stations in the
\n30-50 MHz range located several hundred or even thousand of miles away.
\nThis is because of summer atmospheric conditions. This type of reception
\nis unpredictable but often very interesting!<\/p>\n
One very useful service is the National Weather Service’s continuous
\nweather broadcast. These broadcasts contain weather forecasts and data
\nfor the areas around the station, plus bulletins on any threatening
\nweather conditions. These stations use three frequencies – 162.40,
\n162.475 or 162.55 MHz. In most areas of the country, you can receive one
\nof these frequencies.<\/p>\n
A Guide To The Action Bands<\/p>\n
With the right frequencies programmed into your PRO-Series Scanner, you
\ncan monitor exciting events. With a little investigation, you can find
\nactive frequencies in your community. We can give you some general
\npointers, and you can take it from there. Please use caution and common
\nsense when you hear an emergency call. Never go to the scene of an
\nemergency. It could be very dangerous.<\/p>\n
Find out if there is a local club that monitors your community’s
\nfrequencies. Perhaps a local electronics repair shop that works on
\nequipment similar to your scanner can give you frequencies used by local
\nradio services.<\/p>\n
A volunteer police department or fire department can also be a good source
\nfor this information.<\/p>\n
As a general rule on VHF, most activity is concentrated between 153.785
\nand 155.98 MHz and then again from 158.73 to 159.46 MHz. Here you find
\nlocal government, police, fire and most such emergency services. If you
\nare near a railroad yard or major railroad tracks, look around 160.0 to
\n161.9 MHz for signals.<\/p>\n
In some larger cities, there has been a move to the UHF bands for
\nemergency service. Here, most of the activity is between 453.025 and
\n453.95 MHz and between 456.025 and 467.925 MHz.<\/p>\n
In the UHF band, frequencies between 456.025 and 459.95 MHz and between
\n465.025 and 469.975 MHz are used by mobile units and control stations
\nassociated with base and repeater units that operate 5 MHz lower (that is,
\n451.025 to 454.950 and 460.025 to 464.975 MHz). This means that if you
\nfind an active frequency inside one of these spreads, you can look 5 MHz
\nlower (or higher) to find the base station\/repeater for that service.<\/p>\n
Typical Band Usage<\/p>\n
The following is a brief listing of the typical services that use the
\nbands you scanner can receive. This listing helps you decide which ranges
\nyou would like to scan.<\/p>\n
These frequencies are subject to change, and might vary from area to area.
\nFor a more complete listing refer to the Police Call Radio Guide available
\nat you local RadioShack store.<\/p>\n
Abbreviations:<\/p>\n
Affiliate Radio System: ……………………………………… Mars
\nAmateur: ……………………………………………………. Ham
\nAutomobile Emergency: ………………………………….. Auto Emer.
\nBroadcast Remote: …………………………………………… BC.R
\nBureau of Reclamation: ………………………………….. Bur.Recl.
\nCivil Air Patrol: ……………………………………………. CAP
\nDepartment of Agriculture and Forestry: ……………….. Agr. And For.
\nFire Department: ……………………………………………. F.D.
\nForest Products: ……………………………………….. For.Prod.
\nForestry Conservation: …………………………………. Fors.Cons.
\nGovernment: ……………………………………………….. Govt.
\nHighway Maintenance: ………………………………………… Hwy.
\nLand Transportation: …………………………………….. Land Tr.
\nLocal Government: ………………………………………… L.Govt.
\nManufacturers: ……………………………………………… Mfg.
\nMilitary: …………………………………………………… MIL
\nMobile Telephone : ………………………………………. Mob.Tel.
\nMotion Picture: …………………………………………… Mot.P.
\nMotor Carrier: ………………………………………. Buses.Trucks
\nNational Parks: …………………………………………. Nat.Park
\nPetroleum: …………………………………………………. Pet.
\nPolice: ……………………………………………………. P.D.
\nPower Utilities: …………………………………………… Power
\nRadio Paging: ………………………………………………. Page
\nRailroad: ………………………………………………….. R.R.
\nRelay Press: ………………………………………………. Press
\nState Police: ……………………………………………. St.P.D.
\nSpecial Emergency: ………………………………………. Sp.Emer.
\nSpecial Industry: ………………………………………… Sp.Ind.
\nTaxicab Radio: ……………………………………………… Taxi
\nTelephone Maintenance: …………………………………. Tel.Maint.
\nU.S. Coastal and Geodetic Survey: ……………………….. U.S.C.G.S.
\nU.S. Navy: ………………………………………………….. USN
\nU.S. Weather Bureau: …………………………………….. U.S.W.B.<\/p>\n
ATTENTION: Your scanner may not be able to receive all frequencies and\/or
\nmodes of reception that are contained within this document.
\nFor complete information of your scanner’s capabilities, be
\nsure to read your owner’s manual completely.<\/p>\n
Guide To Frequencies<\/p>\n
National Weather Frequencies:<\/p>\n
1) 161.650 5) 162.440 9) 162.525
\n2) 161.775 6) 162.450 10) 162.550
\n3) 162.400 7) 162.475 11) 163.275
\n4) 162.425 8) 162.500<\/p>\n
Ham Radio Frequencies<\/p>\n
Ham operators often transmit emergency information when other
\ncommunication methods break down. The following chart shows some of the
\nfrequencies that Hams use.<\/p>\n
Wavelength Frequency
\n(Meters) (MHz)<\/p>\n
10-meter 28.000-29.700
\n6-meter 50.000-54.000
\n2-meter 144.000-148.000
\n70-cm 420.000-450.000<\/p>\n
The following are the channels and frequencies of the Citizens Band:<\/p>\n
1) 26.965 21) 27.215
\n2) 26.975 22) 27.225
\n3) 26.985 23) 27.255
\n4) 27.005 24) 27.235
\n5) 27.015 25) 27.245
\n6) 27.025 26) 27.265
\n7) 27.035 27) 27.275
\n8) 27.055 28) 27.285
\n9) 27.065 29) 27.295
\n10) 27.075 30) 27.305
\n11) 27.085 31) 27.315
\n12) 27.105 32) 27.325
\n13) 27.115 33) 27.335
\n14) 27.125 34) 27.345
\n15) 27.135 35) 27.355
\n16) 27.155 36) 27.365
\n17) 27.165 37) 27.375
\n18) 27.175 38) 27.385
\n19) 27.185 39) 27.395
\n20) 27.205 40) 27.405<\/p>\n
Guide To The Action Bands<\/p>\n
United States Broadcast Bands<\/p>\n
In the United States, there are several broadcast bands. The standard AM
\nand FM bands are probably the most well known. There are also four
\ntelevision audio broadcast bands-the lower three transmit on the VHF band
\nand the fourth transmits on the UHF band.<\/p>\n
Frequency Range Allocation<\/p>\n
54.0 – 72.0 MHz ……………………………………. VHF Television
\n76.0 – 88.0 MHz ……………………………………. VHF Television
\n88.0 – 108.0 MHz ……………………………………… Standard FM
\n174.0 – 216.0 MHz ………………………………….. VHF Television
\n470.0 – 805.75 MHz …………………………………. UHF Television<\/p>\n
International Broadcast Bands<\/p>\n
Several short-wave bands are allocated for international broadcasting
\nbecause of the nature of propagation of high frequencies. The bands are
\nsometimes identified according to the approximate wavelength of the
\nsignals in meters. Your scanner may receive the 11-meter band, from
\n25.6 – 26.10 MHz.<\/p>\n
Typical Band Usage<\/p>\n
HF Band (3.0 – 30.0 MHz):<\/p>\n
Mid Range: ……………………………………… 25.00 – 28.63 MHz
\n10-Meter Amateur Band: …………………………… 28.00 – 29.70 MHz
\nHigh Range: …………………………………….. 29.70 – 29.90 MHz<\/p>\n
VHF Band (30.00 – 300.0 MHz):<\/p>\n
Low range: ……………………………………… 30.00 – 50.00 MHz
\n6-Meter Amateur: ………………………………… 50.00 – 54.00 MHz
\nFM-TV Audio Broadcast, Wide Band: …………………. 54.00 – 72.00 MHz
\nFM Radio Broadcast, Wide Band: …………………… 88.00 – 108.00 MHz
\nAircraft: …………………………………….. 108.00 – 136.00 MHz
\nU.S. Government: ………………………………. 138.00 – 144.00 MHz
\n2-Meter Amateur: ………………………………. 144.00 – 148.00 MHz
\nHigh Range: …………………………………… 148.00 – 174.00 MHz
\nNew Mobile Narrow Band: ………………………… 220.00 – 222.00 MHz
\n1.3-Meter Amateur: …………………………….. 222.00 – 225.00 MHz
\nMilitary Aircraft: …………………………….. 225.00 – 287.80 MHz<\/p>\n
UHF Band (300.00 MHz – 3.0 GHz):<\/p>\n
Military Aircraft: …………………………….. 311.00 – 384.00 MHz
\nU.S. Government: ………………………………. 406.00 – 470.00 MHz
\n0.6-Meter Amateur: …………………………….. 420.00 – 450.00 MHz
\nLow Range: ……………………………………. 450.00 – 470.00 MHz
\nFM-TV Audio Broadcast, Wide Band: ……………….. 470.00 – 806.00 MHz
\nConventional Systems: ………………………….. 851.00 – 856.00 MHz
\nConventional\/Trunked Systems: …………………… 856.00 – 861.00 MHz
\nTrunked Systems: ………………………………. 861.00 – 866.00 MHz
\nPublic Safety: ………………………………… 866.00 – 869.00 MHz
\nCommon Carrier: ……………………………….. 869.00 – 894.00 MHz
\nPrivate Trunked: ………………………………. 935.00 – 940.00 MHz
\nGeneral Trunked: ………………………………. 940.00 – 941.00 MHz<\/p>\n
Primary Usage:<\/p>\n
As a general rule, most of the radio activity is concentrated on the
\nfollowing frequencies:<\/p>\n
VHF Band:<\/p>\n
2-Meter Amateur Band: ………………………… 144.000 – 148.000 MHz
\nGovernment, police, and Fire: …………………. 153.785 – 155.980 MHz
\nEmergency Services: ………………………….. 158.730 – 159.460 MHz
\nRailroad: …………………………………… 160.000 – 161.900 MHz<\/p>\n
UHF Band:<\/p>\n
.6 cm Amateur Band FM Repeaters: ………………. 440.000 – 450.000 MHz
\nLand Mobile “Paired” Frequencies: ……………… 450.000 – 470.000 MHz
\nBase Stations: ………………………………. 451.025 – 454.950 MHz
\nMobile Units: ……………………………….. 456.025 – 459.950 MHz
\nRepeater Units: ……………………………… 460.025 – 464.975 MHz
\nControl Stations: ……………………………. 465.025 – 469.975 MHz<\/p>\n
NOTE: UHF remote control stations and mobile units typically operate at 5
\nMHz higher than their associated base and relay repeater units.<\/p>\n
Specified Intervals<\/p>\n
Frequencies in different bands are accessible only at specific intervals.<\/p>\n
For Example:<\/p>\n
VHF, HAM, and Government: ……………………………. 5.0 kHz steps
\nAll Others: ……………………………………….. 12.5 kHz steps
\nAircraft: …………………………………………. 25.0 kHz steps<\/p>\n
Note: Your scanner rounds the entered frequency to the nearest valid
\nfrequency. For example, if you try to enter 151.473, the scanner
\nmight accept this as 151.470.<\/p>\n
Band Allocation<\/p>\n
To help you decide which frequency ranges to search, use the following
\nlisting of the typical services that use the frequencies your scanner
\nreceives. These frequencies are subject to change, and might vary from
\narea to area. For a more complete listing, refer to the “Police-Call Radio
\nGuide including Fire and Emergency Services”, as well as “Beyond Police
\nCall”, “Aeronautical Directory”, “Nautical Directory” and “Now you’re
\nTalking” texts available at your local RadioShack store.<\/p>\n
Abbreviations<\/p>\n
AIR: …………………………………………………… Aircraft
\nBIFC: ……………………………. Boise (ID) Interagency Fire Cache
\nBUS: …………………………………………………… Business
\nCAP: ……………………………………………. Civil Air Patrol
\nCB: ……………………………………………….. Citizens Band
\nCCA: ……………………………………………… Common Carrier
\nCSB: ………………………………………… Conventional Systems
\nCTSB: ………………………………… Conventional\/Trunked Systems
\nFIRE: ……………………………………………. Fire Department
\nHAM: …………………………………………. Amateur (HAM) Radio
\nGOVT: …………………………………………. Federal Government
\nGMR: ………………………………………… General Mobile Radio
\nGTR: …………………………………………….. General Trunked
\nIND: …………………………………………. Industrial Services
\nMARI: ……………………………………… Maritime Limited Coast
\nMARS: ……………………………… Military Affiliate Radio System
\nMED: …………………………………… Emergency\/Medical Services
\nMIL: ………………………………………………. U.S. Military
\nMOV: ………………………………… Motion Picture\/Video Industry
\nNEW: …………………………………………… New Mobile Narrow
\nNEWS: ……………………………………………….. Relay Press
\nOIL: ………………………………………. Oil\/Petroleum Industry
\nPOL: …………………………………………… Police Department
\nPUB: …………………………………………….. Public Services
\nPSB: ………………………………………………. Public Safety
\nPTR: …………………………………………….. Private Trunked
\nROAD: ………………………………….. Road & Highway Maintenance
\nRTV: ……………………………… Radio\/TV Remote Broadcast Pickup
\nTAXI: ……………………………………………… Taxi Services
\nTELBL: ………………………………………….. Mobile Telephone
\nTELC: ………………………………………… Cordless Telephones
\nTELM: ………………………………………. Telephone Maintenance
\nTOW: …………………………………………………. Tow Trucks
\nTRAN: …………………………………….. Transportation Services
\nTSB: …………………………………………….. Trunked Systems
\nTVn: ……………………………………….. FM-TV Audio Broadcast
\nUSXX: ………………………………………. Government Classified
\nUTIL: …………………………………….. Power & Water Utilities
\nWTHR: …………………………………………………… Weather<\/p>\n
High Frequency (HF)-(3 – 30 MHz):
\nHigh Band – (25.00 – 27.36 MHz):<\/p>\n
25.020 – 25.320: …………………………………………….. IND
\n25.870 – 26.470: …………………………………………….. RTV
\n26.62: ……………………………………………………… CAP
\n26.966 – 27.405: ……………………………………………… CB
\n27.430 – 27.630: …………………………………………….. BUS<\/p>\n
10-Meter Amateur Band – (28.0 – 29.7 MHz):<\/p>\n
28.000 – 29.700: …………………………………………….. HAM<\/p>\n
Very High Frequency (VHF) – (30 – 300 MHz):<\/p>\n
Low Band – (29.7 – 50 MHz – in 5 kHz steps):<\/p>\n
29.700 – 29.790: …………………………………………….. IND
\n29.900 – 30.550: ……………………………………….. GOVT, MIL
\n30.580 – 31.980: ………………………………………… IND, PUB
\n32.000 – 32.990: ……………………………………….. GOVT, MIL
\n33.020 – 33.980: ……………………………………. BUS, IND, PUB
\n34.010 – 34.990: ……………………………………….. GOVT, MIL
\n35.020 – 35.980: ………………………………. BUS, PUB, IND, TELM
\n36.000 – 36.230: ……………………………………….. GOVT, MIL
\n36.250: ……………………………………….. Oil spill clean up
\n36.270 – 36.990: ……………………………………….. GOVT, MIL
\n37.020 – 37.980: ………………………………………… PUB, IND
\n38.000 – 39.000: ……………………………………….. GOVT, MIL
\n39.020 – 39.980: …………………………………………….. PUB
\n40.000 – 42.000: ………………………………….. GOVT, MIL, MARI
\n42.020 – 42.940: …………………………………………….. POL
\n42.960 – 43.180: …………………………………………….. IND
\n43.220 – 43.680: …………………………………… TELM, IND, PUB
\n43.700 – 44.600: ……………………………………………. TRAN
\n44.620 – 46.580: ………………………………………… POL, PUB
\n46.600 – 46.990: ………………………………………. GOVT, TELC
\n47.020 – 47.400: …………………………………………….. PUB
\n47.420: ……………………………………….. American Red Cross
\n47.440 – 49.580: ………………………………………… IND, PUB
\n49.610 – 49.990: ……………………………………….. MIL, TELC<\/p>\n
6-METER Amateur Band (50-54 MHz):<\/p>\n
50.00 – 54.00: ………………………………………………. HAM<\/p>\n
FM-TV Audio Broadcast, Wide Band (54-72 MHz):<\/p>\n
59.750: …………………………………………………….. TV2
\n65.750: …………………………………………………….. TV3
\n71.750: …………………………………………………….. TV4<\/p>\n
Land Mobile Service Band (72-76 MHz):<\/p>\n
FM-TV Audio Broadcast, Wide Band (76-88 MHz):<\/p>\n
81.750: …………………………………………………….. TV5
\n87.750: …………………………………………………….. TV6<\/p>\n
FM Radio Broadcast, Wide Band (88-108 MHz):<\/p>\n
Aircraft Band (108-136 MHz):<\/p>\n
108.000 – 121.490: …………………………………………… AIR
\n121.500: …………………………………………… AIR emergency
\n121.510 – 136.000: …………………………………………… AIR<\/p>\n
U.S. GOVERNMENT BAND (138-144 MHz):<\/p>\n
137.000 – 144.000: ……………………………………… GOVT, MIL<\/p>\n
VHF-Hi BAND (148-174 MHz):<\/p>\n
148.050 – 150.345: …………………………………. CAP, MARS, MIL
\n150.775 – 150.790: …………………………………………… MED
\n150.815 – 150.965: …………………………………………… TOW
\n150.980: ………………………………………. Oil spill clean up
\n150.995 – 151.130: ………………………………………….. ROAD
\n151.145 – 151.475: …………………………………………… POL
\n151.490 – 151.955: ………………………………………. IND, BUS
\n151.985: …………………………………………………… TELM
\n152.030 – 152.240: ………………………………………….. TELB
\n152.270 – 152.465: ……………………………………… IND, TAXI
\n152.480: ……………………………………………………. BUS
\n152.510 – 152.840: ………………………………………….. TELB
\n152.870 – 153.020: ………………………………………. IND, MOV
\n153.035 – 153.175: …………………………………. IND, OIL, UTIL
\n153.740 – 154.445: ……………………………………… PUB, FIRE
\n154.490 – 154.570: ………………………………………. IND, BUS
\n154.585: ………………………………………. Oil spill clean up
\n154.600 – 154.625: …………………………………………… BUS
\n154.665 – 156.240: …………………………….. MED, ROAD, POL, PUB
\n165.255: ……………………………………………………. OIL
\n156.275 – 157.425: ………………………………………….. MARI
\n157.450: ……………………………………………………. MED
\n157.470 – 157.515: …………………………………………… TOW
\n157.530 – 157.725: ……………………………………… IND, TAXI
\n157.740: ……………………………………………………. BUS
\n157.770 – 158.100: ………………………………………….. TELB
\n158.130 – 158.460: ……………………….. BUS, IND, OIL, TELM, UTIL
\n158.490 – 158.700: .. ……………………………………….. TELB
\n158.730 – 159.465: …………………………………. POL, PUB, ROAD
\n159.480: ……………………………………………………. OIL
\n159.495 – 161.565: ………………………………………….. TRAN
\n161.580: ……………………………………………………. OIL
\n161.600 – 162.000: ……………………………………… MARI, RTV
\n162.0125 – 162.35: ………………………………… GOVT, MIL, USXX
\n162.400 – 162.550: ………………………………………….. WTHR
\n162.5625 – 162.6375: ………………………………. GOVT, MIL, USXX
\n162.6625: …………………………………………………… MED
\n162.6875 – 163.225: ……………………………….. GOVT, MIL, USXX
\n163.250: ……………………………………………………. MED
\n163.275 – 166.225: ………………………………… GOVT, MIL, USXX
\n166.250: …………………………………………. GOVT, RTV, FIRE
\n166.275 – 169.400: …………………………………….. GOVT, BIFC
\n169.445: ………………………………………….. WIRELESS MIKES
\n169.500: …………………………………………………… GOVT
\n169.505: ………………………………………….. WIRELESS MIKES
\n169.55 – 169.9875: ………………………………… GOVT, MIL, USXX
\n170.000: …………………………………………………… BIFC
\n170.025 – 170.150: ………………………………… GOVT, RTV, FIRE
\n170.175 – 170.225: ………………………………………….. GOVT
\n170.245 – 170.305: …………………………………. WIRELESS MIKES
\n170.350 – 170.400: ……………………………………… GOVT, MIL
\n170.425 – 170.450: ………………………………………….. BIFC
\n170.475: ……………………………………………………. PUB
\n170.4875 – 173.175: ………………………. GOVT, PUB, WIRELESS MIKES
\n173.225 – 173.375: ………………………………… MOV, NEWS, UTIL
\n173.3875 – 178.5375: …………………………………………. MIL
\n173.5625 – 173.5875: ……………………….. MIL Medical\/Crash Crews
\n173.60 – 173.9875: ………………………………………….. GOVT<\/p>\n
FM-TV Audio Broadcast, VHF Wide Band (174-216 MHz):<\/p>\n
179.750: ……………………………………………………. TV7
\n185.750: ……………………………………………………. TV8
\n191.750: ……………………………………………………. TV9
\n197.750: …………………………………………………… TV10
\n203.750: …………………………………………………… TV11
\n209.750: …………………………………………………… TV12
\n215.750: …………………………………………………… TV13<\/p>\n
New Mobil Narrow Band (220-222 MHz):<\/p>\n
220.000 – 222.000: …………………………………………… NEW<\/p>\n
1.3-Meter Amateur Band (222-225 MHz):<\/p>\n
222.000 – 225.000: …………………………………………… HAM<\/p>\n
MILITARY AIRCRAFT BAND (237.9-287.8 MHz):<\/p>\n
237.900: ………………………………. Coast Guard Search & Rescue
\n239.800: …………………………………………….. FAA Weather
\n241.000: …………………………………………………… ARMY
\n243.000: ………………………………………………. EMERGENCY
\n255.400: ………………………………………. FAA FLIGHT SERVICE
\n257.800: …………………………………………. CIVILIAN TOWERS
\n287.800: ……………………………………… Coast Guard Air\/Sea
\nRescue<\/p>\n
Ultra High Frequency (UHF)-(300 MHz-3 GHz)<\/p>\n
Military Aircraft Band (319.1 – 383.9 MHz):<\/p>\n
319.100: ……………………………………… FAA Traffic Control
\n321.000 – 336.600: ……………………………………… Air Force
\n342.500 – 344.600: ……………………………………. FAA Weather
\n346.400 – 364.200: ……………………….. Air Force Traffic Control
\n381.800 – 383.900: ……………………………………. Coast Guard<\/p>\n
U.S. Government Band (406-420 MHz):<\/p>\n
406.125 – 419.975: …………………………………….. GOVT, USXX<\/p>\n
70-cm Amateur Band (420-450 MHz):<\/p>\n
420.000 – 450.000: …………………………………………… HAM<\/p>\n
Low Band (450-470 MHz):<\/p>\n
450.050 – 450.925: …………………………………………… RTV
\n451.025 – 452.025: ……………………………. IND, OIL, TELM, UTIL
\n452.0375 – 453.00: ………………………. IND, TAXI, TRAN, TOW, NEWS
\n453.0125 – 453.9875: …………………………………………. PUB
\n454.000: ……………………………………………………. OIL
\n454.025 – 454.975: ………………………………………….. TELB
\n455.050 – 455.925: …………………………………………… RTV
\n457.525 – 457.600: …………………………………………… BUS
\n458.025 – 458.175: …………………………………………… MED
\n460.0125 – 460.6375: ……………………………….. FIRE, POL, PUB
\n460.650 – 462.175: …………………………………………… BUS
\n462.1875 – 462.450: ……………………………………… BUS, IND
\n462.4625 – 462.525: …………………………… IND, OIL, TELM, UTIL
\n462.550 – 462.725: …………………………………………… GMR
\n462.750 – 462.925: …………………………………………… BUS
\n462.9375 – 463.1875: …………………………………………. MED
\n463.200 – 467.925: …………………………………………… BUS<\/p>\n
FM-TV Audio Broadcast, UHF Wide Band (470-512 MHz):
\n(Channels 14-69 in 6 MHz steps):<\/p>\n
475.750: ……………………………………………… Channel 14
\n481.750: ……………………………………………… Channel 15
\n487.750: ……………………………………………… Channel 16
\n805.750: ……………………………………………… Channel 69<\/p>\n
Note: Some cities use the 470-512 MHz band for land\/mobile service.<\/p>\n
Conventional Systems Band – Locally Assigned<\/p>\n
851.0125 – 855.9875: …………………………………………. CSB<\/p>\n
Conventional\/Trunked Systems Band – Locally Assigned<\/p>\n
856.0125 – 860.9875: ………………………………………… CTSB<\/p>\n
Trunked Systems Band – Locally Assigned<\/p>\n
861.0125 – 865.9875: …………………………………………. TSB<\/p>\n
Public Safety Band – Locally Assigned<\/p>\n
866.0125 – 868.9875: …………………………………………. PSB<\/p>\n
Common Carrier<\/p>\n
869.010 – 894.000: …………………………………………… CCA<\/p>\n
Private Trunked<\/p>\n
935.0125 – 939.9875: …………………………………………. PTR<\/p>\n
General Trunked<\/p>\n
940.0125 – 940.9875: …………………………………………. GTR<\/p>\n
Frequency Conversion<\/p>\n
The tuning of a station can be expressed in frequency (kHz or MHz) or in
\nwavelength (meters). The following information can help you make the
\nnecessary conversions.<\/p>\n
1 MHz (million)=1,000 kHz (thousand)<\/p>\n
To convert MHz to kHz, multiply by 1,000:<\/p>\n
9.62 MHz x 1000 = 9620 kHz<\/p>\n
To convert from kHz to MHz, divide by 1,000<\/p>\n
2780 kHz \/ 1000 = 2.780 MHz<\/p>\n
To convert MHz to meters, divide 300 by the number of megahertz<\/p>\n
300 \/ 7.1 MHz = 42.25 meters<\/p>\n
A Note on Image Reception<\/p>\n
Radios work by simple mathematics. For example, most tune to a frequency
\nby mixing that frequency with another (local oscillator) frequency which
\nis slightly different. This mixing process primarily gives us the two
\noriginal frequencies, their sum, and their difference. Well, the radio’s
\nIntermediate Frequency (I.F.) filter normally passes either the sum or
\ndifference frequency, and this is then processed into the sound we hear.
\nBecause nothing is perfect, certain “harmonics” will also get through if
\nthey are strong enough. For example, if a radio’s I.F. is 10.7 MHz, we
\nmight be able to tune to a frequency 21.4 MHz (2 x I.F.) above (or below,
\ndepending on the radio’s design) a strong signal and hear it! This is more
\nevident in a double-conversion radio than a triple-conversion radio,
\nbecause the triple-conversion radio’s 1st intermediate frequency is quite
\nhigh. This causes the image to be so far off frequency that it is easy to
\neffectively filter it out.<\/p>\n
So remember that just because a radio doesn’t receive something which
\nanother does is not necessarily an indication of a problem. The one radio
\nmay simply not be “tricked” into picking up an image! This rejection of
\nundesired signals is one reason that a triple-conversion receiver costs
\nmore than a similar dual-conversion model.<\/p>\n
You might be interested in finding more out about radio. One good
\nlocation to start looking is your local public library. You might also
\nwish to contact the A.R.R.L., as they are an excellent source of
\ninformative texts on the subject.<\/p>\n
Contact:
\nAmateur Radio Relay League
\n225 Main St.,
\nNewington, CT 06111-1494
\nUSA<\/p>\n
(CD EB 2\/22\/00)<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Birdies Birdies are frequencies your scanner uses when it operates. These operating frequencies might interfere with broadcasts on the same frequencies. If you program one of these frequencies, you hear only noise on that frequency. If the interference is not severe, you might be able to turn SQUELCH clockwise to cut out the birdie. The […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[463],"tags":[464,466,465],"class_list":["post-1092","post","type-post","status-publish","format-standard","hentry","category-cbradios","tag-birdies","tag-ham-radio","tag-scanner-frequencies"],"_links":{"self":[{"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/posts\/1092","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/comments?post=1092"}],"version-history":[{"count":3,"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/posts\/1092\/revisions"}],"predecessor-version":[{"id":1094,"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/posts\/1092\/revisions\/1094"}],"wp:attachment":[{"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/media?parent=1092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/categories?post=1092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eyoungwon.com\/journal\/wp-json\/wp\/v2\/tags?post=1092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}