Icom IC-2720H Instruction Manual
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Icom IC-2720H Instruction Manual

Dual band fm transceiver
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See also: Service Manual , Operating Manual
INSTRUCTION MANUAL
DUAL BAND FM TRANSCEIVER
i2720H
This device complies with Part 15 of the FCC rules. Operation is sub-
ject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.

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Summary of Contents for Icom IC-2720H

  • Page 1 INSTRUCTION MANUAL DUAL BAND FM TRANSCEIVER i2720H This device complies with Part 15 of the FCC rules. Operation is sub- ject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
  • Page 2 IC-2720H. We want to take a couple of moments of your time to thank you for making your IC-2720H your radio of choice, and hope you agree with Icom’s philosophy of “technology first.” Many EXPLICIT DEFINITIONS hours of research and development went into the design of your IC-2720H.
  • Page 3 Changes or modifications to this device, not ex- cle may be hindered or where it could cause bodily injury. pressly approved by Icom Inc., could void your authority to operate this device under FCC regulations.

  • Page 4: Table Of Contents

    SUPPLIED ACCESSORIES TABLE OF CONTENTS FOREWORD ................... i IMPORTANT .................... i EXPLICIT DEFINITIONS ................. i PRECAUTION ..................ii SUPPLIED ACCESSORIES ..............iii TABLE OF CONTENTS ................. iii QUICK REFERENCE GUIDE ............I–XII I Installation ..................I I Your first contact ................. VIII I Repeater operation ................
  • Page 5 I Selecting output power ..............20 9 DTMF MEMORY ENCODER ............. 48–51 I One-touch PTT function ............... 21 I Programming a DTMF code ............48 I Audio mute function ..............21 I Transmitting a DTMF code ............50 I DTMF speed ................51 4 REPEATER OPERATION ............

  • Page 6: Separation Cable

    QUICK REFERENCE GUIDE I Installation D Installation methods • Single body installation • Remote installation Front panel Transceiver Main body • Optional MB-85 is necessary to • The supplied MB-84 COMBINATION BRACKET REMOTE CONTROLLER BRACKET ″ separa- mount the controller to the main unit. (20 cm; 7 ⁄...

  • Page 7: Using The Mounting Bracket

    QUICK REFERENCE GUIDE D Location D Using the mounting bracket qDrill 4 holes where the mounting bracket is to be installed. Select a location which can support the weight of the trans- ″) when using nuts; approx. 2–3 mm ( ″) ceiver and does not interfere with driving.
  • Page 8 QUICK REFERENCE GUIDE D MB-84 installation The supplied MB-84 is used REMOTE CONTROLLER BRACKET for separate installation. wAttach the remote controller to the MB-84 and tighten the q Drill 2 holes where the bracket is to be installed. ″) when using nuts; approx. 1–2 mm ( ″) •...
  • Page 9 D Optional MB-85 installation When using the optional MB-85 ( ), you COMBINATION BRACKET can install the control head of the IC-2720H in one of 2 meth- ″) remote control cable is supplied for con- ods. A 20 cm (7 ⁄...
  • Page 10 D Separation cable connection D Microphone connection A separation cable (3.5 m; 11.5 ft) is supplied with the IC- Two microphone connectors are available for the IC-2720H— 2720H. one is on the controller side panel, and another is on the main unit front panel.

  • Page 11: Battery Connection

    • CONNECTING TO A DC POWER SUPPLY Attach a rubber grommet when passing the DC power cable through a metal plate to prevent a short circuit. • CONNECTING TO A DC POWER SOURCE IC-2720H Grommet IC-2720H DC power supply 13.8 V −...

  • Page 12: Antenna Installation

    QUICK REFERENCE GUIDE D Antenna installation • Antenna connector The antenna uses a PL-259 connector. • Antenna location To obtain maximum performance from the transceiver, select • PL-259 CONNECTOR a high-quality antenna and mount it in a good location. A non- q Slide the coupling ring 30 mm radial antenna should be used when using a magnetic mount.

  • Page 13: I Your First Contact

    2. Selecting the main band The IC-2720H displays 2 frequencies on left and right bands Now that you have your IC-2720H installed in your car or simultaneously. However, transmission, some switches and shack, you are probably excited to get on the air. We would...
  • Page 14 3. Selecting the operating frequency band 4. Tune the frequency The IC-2720H has 2 m and 70 cm bands for each left and The tuning dial will allow you to dial in the frequency you want right band. The operating band can be exchanged between to operate.

  • Page 15: I Repeater Operation

    QUICK REFERENCE GUIDE I Repeater operation 1. Setting duplex Using the HM-133 Plus or minus duplex selection and the repeater tone setting Push desired band’s [MAIN•BAND] to select the main band. can be made easily via HM-133. Push [DUP•MONI] once or twice to select minus duplex or Push [ 7(TONE)] for minus duplex;...

  • Page 16: I Programming Memory Channels

    QUICK REFERENCE GUIDE I Programming memory channels The IC-2720H has a total of 212 memory channels (including 3. Writing a memory channel 10 scan edges and 2 call channels) for storing often used op- Push and hold the [M/CALL•MW] for 1 sec. to program.
  • Page 17 QUICK REFERENCE GUIDE Using the HM-133 q In VFO mode, set the desired operating frequency, includ- ing offset direction, tone settings, etc. ➥ Push [VFO/LOCK] to select VFO. ➥ Push [ C(T-OFF)] first, then enter the desired oper- ating frequency via the keypad. •...

  • Page 18: Panel Description

    PANEL DESCRIPTION I Front panel— controller Function display (pgs. 3, 4) MAIN MAIN BAND BAND T SQL DTCS T SQL DTCS MAIN MAIN V/MHz V/MHz SCAN SCAN M/CALL LOWMID LOWMID M/CALL BUSY BUSY SKIP SKIP i2720 DUAL BAND FM TRANSCEIVER DIAL DIAL TONE...
  • Page 19 PANEL DESCRIPTION Left band Right band MAIN MAIN BAND BAND V/MHz V/MHz SCAN SCAN M/CALL M/CALL i2720 DUAL BAND FM TRANSCEIVER DIAL DIAL TONE MONI DTMF PRIO *The same controls for both the left and right bands are arranged in symmetry. y MAIN•BAND SWITCH [MAIN•BAND] o VOLUME CONTROL [VOL] (p.

  • Page 20: I Function Display

    PANEL DESCRIPTION I Function display Left band Right band T SQL DTCS T SQL DTCS MAIN MAIN BUSY LOWMID BUSY LOWMID SKIP SKIP *The same indications for both the left and right bands are arranged. q MAIN INDICATOR (p. 11) r TONE INDICATORS ➥...
  • Page 21 PANEL DESCRIPTION t AM INDICATOR (p. 64) !2 BUSY INDICATOR ➥ Appears when a signal is being received or the squelch Appears when AM mode is selected. is open. (p. 16) y FREQUENCY READOUT ➥ Blinks while the monitor function is activated. (p. 16) Shows the operating frequency, set mode contents, etc.

  • Page 22: I Main Unit

    PANEL DESCRIPTION I Main unit w MICROPHONE CONNECTOR [MIC] Connects the supplied or an optional microphone. q +8 V DC output (Max. 10 mA) w Channel up/down e 8 V control IN r PTT t GND (microphone ground) y MIC (microphone input) u GND i Data IN e CONTROLLER CONNECTOR [CONTROLLER] (p.
  • Page 23 PANEL DESCRIPTION y EXTERNAL SPEAKER JACK 1 [SP-1] D DATA JACK PIN ASSIGNMENT Connects an 8 Ω speaker. Outputs both left and right bands audio when no external speaker is connected to [SP-2]. See the table below for details. • Audio output power is more than 2.4 W. u EXTERNAL SPEAKER JACK 2 [SP-2] Connects an 8 Ω...

  • Page 24: I Microphone (Hm-133)

    PANEL DESCRIPTION I Microphone (HM-133*) r ACTIVITY INDICATOR ➥ Lights red while any key, except [FUNC] and [DTMF-S], is pushed, or while transmitting. ➥ Lights green while the one-touch PTT function is in use. t KEYPAD (pgs. 8, 9) y FUNCTION INDICATOR ➥...

  • Page 25: I Microphone Keypad

    PANEL DESCRIPTION I Microphone keypad FUNCTION SECONDARY FUNCTION ( +key) OTHER FUNCTIONS Switches between opening and closing the In VFO mode enters operating band select- squelch. (p. 16) ing condition. (p. 12) In memory mode enters bank selecting condition. (p. 35) Starts and stops scanning.
  • Page 26 PANEL DESCRIPTION FUNCTION SECONDARY FUNCTION ( +key) OTHER FUNCTIONS ➥ Cancels frequency entry. ➥ Selects a memory channel for program- (p. 13) ➥ Cancels the scan or priority watch. ming. (p. 31) ➥ Advances the memory channel number (pgs. 41, 47) ➥...

  • Page 27: I Optional Microphones (Hm-118N/Tn/Tan)

    PANEL DESCRIPTION I Optional Microphones (HM-118N/TN/TAN) q PTT SWITCH • HM-118N ➥ Push and hold to transmit; release to receive. w UP/DOWN SWITCHES [UP]/[DN] ➥ Push either switch to change operating frequency, memory channel, set mode setting, etc. (pgs. 13, 29, 56) ➥...

  • Page 28: Setting A Frequency

    ➥ Push [PWR] for 1 sec. to turn power ON and OFF. [MAIN•BAND] for 1 sec. [DIAL] D MAIN band The IC-2720H can receive 144 MHz and 430(440) MHz band signals simultaneously. To activate all functions access or to MAIN MAIN change frequency via the microphone, you must designate one band as the main band.
  • Page 29 MAIN MAIN — USA and General versions only In addition to the 2 m and 70 cm ham bands, the IC-2720H USA and General versions have extra frequency bands for each left and right bands as follow. VFO mode is selected “!”...

  • Page 30: I Using The Tuning Dial

    SETTING A FREQUENCY I Using the tuning dial I Using the keypad The frequency can be directly set via numeral keys on the mi- q Rotate the desired band’s [DIAL] to set the frequency. crophone. • If VFO mode is not selected, push the same band’s [V/MHz•SCAN] to select VFO mode.

  • Page 31: I Tuning Step Selection

    SETTING A FREQUENCY I Tuning step selection rRotate the same band’s [DIAL] to select the desired tuning Tuning steps are the minimum frequency change increments when you rotate [DIAL] or push [Y]/[Z] on the microphone. step. tPush [TONE•DTMF] to exit set mode. Independent tuning step for the left and right, as well as each frequency bands can be set for individual tuning convenience.

  • Page 32: I Lock Functions

    SETTING A FREQUENCY I Lock functions D Microphone keypad lock To prevent accidental frequency changes and unnecessary function access, use the lock function. The transceiver has 2 This function locks the microphone keypad. different lock functions. ➥ Push [FUNC] then [ D(16KEY-L)] to D Frequency lock 16KEY-L...

  • Page 33: Basic Operation

    BASIC OPERATION I Receiving I Monitor function q Set the audio level for the main band. This function is used to listen to weak signals without disturb- ➥ Push the desired band’s [MAIN•BAND]. ing the squelch setting. ➥ Push [DUP•MONI] for 1 sec. to open the squelch. Push [DUP•MONI] ➥...

  • Page 34: I Squelch Attenuator

    BASIC OPERATION I Squelch attenuator D Squelch attenuator setting INITIAL SET MODE USING The transceiver has an RF attenuator related to the squelch q Turn the transceiver power OFF. level setting. Approx. 10 dB attenuation is obtained at maxi- wWhile pushing [SET• mum setting.

  • Page 35: I V/V, U/U Simultaneous Receive (Para-Watch)

    I V/V, U/U simultaneous receive (Para-watch) qPush either the left or right band’s [MAIN•BAND] for 1 sec. The IC-2720H can simultaneously receive two signals on the same band, such as 144 MHz band, using the para-watch to select the frequency band selecting condition.

  • Page 36: I Sub Band Mute/Sub Band Busy Beep

    BASIC OPERATION I Sub band mute/sub band busy beep INITIAL SET MODE USING e Rotate the left band’s [DIAL] to select the condition. The sub band mute function automatically cuts out sub band audio signals when both main and sub band signals are re- DISPLAY SUB BAND MUTE BUSY BEEP...

  • Page 37: I Transmitting

    • The output power can be changed via the microphone IMPORTANT! (for 50/35 W transmission): during receive only. The IC-2720H is equipped with protection circuit to protect the power amplifier circuit from high SWR (Standing Wave and temperature. When a high SWR antenna or no...

  • Page 38: I One-Touch Ptt Function

    BASIC OPERATION I One-touch PTT function I Audio mute function The PTT switch can be operated as a one-touch PTT switch This function temporarily mutes the audio without disturbing (each push toggles between transmit/receive). Using this the volume setting. function you can transmit without pushing and holding the ➥...

  • Page 39: Repeater Operation

    Set the subaudible tone (repeater tone) encoder function ON. - Set the subaudible tone frequency, if required. • The IC-2720H USA version has the auto repeater function. Thus the steps 3 and 4 may not be necessary, depending on the setting.

  • Page 40: I Accessing A Repeater

    REPEATER OPERATION I Accessing a repeater q Set the receive frequency (repeater output frequency) on r Push and hold [PTT] to transmit. • The displayed frequency automatically changes to the transmit the main band. (pgs. 11–13) frequency (repeater input frequency). Push [DUP•MONI] one or two times, to select minus du- •...
  • Page 41 REPEATER OPERATION z Set the receive frequency (repeater output fre- m Push [ 9(TSQL)] to return to simplex opera- SIMP DUP– SIMP quency) on the main band. (pgs. 11–13) tion. x Push [ • “DUP” or “DUP–” indicator disappears. – 7(TONE)] to select minus duplex; , To turn OFF the subaudible tone encoder, push push [ + 8(TSQLS)] to select plus duplex.

  • Page 42: I Subaudible Tones

    REPEATER OPERATION I Subaudible tones z Set the main band, mode/channel you wish to SET MODE USING set the subaudible tones to, such as VFO mode (Encoder function) or memory/call channel. • The subaudible tone frequency is independently pro- D Subaudible tones grammed into each mode or channel.
  • Page 43 REPEATER OPERATION D DTMF tones D 1750 Hz tone ➥ Push [DTMF-S], then push the keys of the de- The microphone has 1750 Hz tone capability, used for ring DTMF-S sired DTMF digits. tone when calling, etc. • The function indicator lights green. z Push [FUNC].

  • Page 44: I Offset Frequency

    REPEATER OPERATION I Offset frequency SET MODE USING z Push [BAND] to select the desired band (left or When communicating through a repeater, the transmit fre- quency is shifted from the receive frequency by an amount right) as the main band. determined by the offset frequency.

  • Page 45: I Auto Repeater (Usa Version Only)

    REPEATER OPERATION I Auto repeater INITIAL SET MODE USING (U.S.A. version only) r Rotate left band’s [DIAL] to select the auto repeater func- The USA version automatically activates the repeater settings tion from “r1,” “r2” or OFF. when the operating (DUP–...

  • Page 46: Memory Operation

    MEMORY OPERATION I General description D Using the [Y]/[Z] keys The transceiver has 212 memory channels including 10 scan edge memory channels (5 pairs), and 2 call channels. Each of z Push [BAND] to select the desired band as these channels can be individually programmed with operating MR/CALL the main band.

  • Page 47: I Programming A Memory Channel

    MEMORY OPERATION I Programming a memory channel eRotate the [DIAL] to select the memory channel to be pro- VFO settings, including the set mode contents such as sub- audible tone frequency, offset, can be programmed into a grammed. memory channel. •...

  • Page 48: Programming A Memory Channel Via The Microphone

    MEMORY OPERATION D Programming a memory channel via the microphone The microphone can also be used to program mem- ory channels. z Set the desired frequency in VFO mode. v Push [FUNC] then [ A(MW)] for 1 sec. to program. ➥...

  • Page 49: I Transferring Memory Contents

    MEMORY OPERATION I Transferring memory contents This function transfers a memory channel’s contents to VFO (or another memory/call channel). This is useful when search- ing for signals around a memory channel frequency and for recalling the offset frequency, subaudible tone frequency etc. z Push [BAND] to select the desired band as D Memory/call➪VFO MR/CALL...
  • Page 50 MEMORY OPERATION D Memory/call➪call/memory z Select the memory/call channel to be trans- MR/CALL ferred. q Select the memory/call channel to be transferred. ➥ Push [MR/CALL] to select memory mode, ➥ Push the desired band’s [M/CALL•MW] several times to then select the desired memory channel select memory mode or call channel, then rotate the via [Y]/[Z] or keypad.

  • Page 51: I Memory Clearing

    MEMORY OPERATION I Memory clearing r Push the same band’s [M/CALL•MW] momentarily, then Contents of programmed memories can be cleared (blanked), if desired. push the [M/CALL•MW] again for 1 sec. This operation must be performed within 1.5 sec. q Push [V/MHz•SCAN] to select VFO mode in the desired •...

  • Page 52: I Memory Bank Selection

    MEMORY OPERATION I Memory bank selection The IC-2720H has a total of 10 banks . Regular mem- (A to J) z Push [MR/CALL] to select memory mode, if de- ory channels, 000 to 199, are assigned into the desired bank BANK sired.

  • Page 53: I Memory Bank Setting

    MEMORY OPERATION I Memory bank setting q Push the desired band’s [M/CALL•MW] several times to y Push the [MAIN•BAND] for 1 sec. then push the select memory mode, then select the desired memory [MAIN•BAND] momentarily again to return to regular mem- channel via the same band’s [DIAL].

  • Page 54: I Transferring Bank Contents

    MEMORY OPERATION I Transferring bank contents r Push the [M/CALL•MW] again. Contents of programmed memory banks can be cleared or • Bank initial or “– –” indication stops blinking. transferred to another bank. t Push the [MAIN•BAND] for 1 sec. then push the INFORMATION: Even if the memory bank contents are [MAIN•BAND] momentarily again to return to regular mem- cleared, the memory channel contents still remain pro-...

  • Page 55: Call Channel Operation

    CALL CHANNEL OPERATION I Call channel selection I Call channel transferring q Push the desired band’s [M/CALL•MW] several times then Call channel is pre-programmed memory channel that can be accessed by simply pushing call channel button. rotate the same band’s [DIAL] to select the desired call channel.

  • Page 56: I Programming A Call Channel

    CALL CHANNEL OPERATION I Programming a call channel r Push the [M/CALL•MW] for 1 sec. to program. Operating frequency, duplex information, subaudible tone in- formation (tone encoder or tone squelch ON/OFF and its fre- • 3 beeps sound and the unit returns to VFO mode automatically. quency) can be programmed into the call channel.

  • Page 57: Scan Operation

    SCAN OPERATION I Scan types Scanning searches for signals automatically and makes it There are 3 scan types and 4 resume conditions to suit your easier to locate new stations for contact or listening purposes. operating needs. BAND SCAN Repeatedly scans all frequen- PROGRAMMED SCAN Repeatedly scans between (p.

  • Page 58: I Scan Start/Stop

    SCAN OPERATION I Scan start/stop D Preparation z Push [VFO/LOCK] to select VFO mode for Scan resume condition (p. 45); program the scan edges SCAN full/programmed scan; push [MR/CALL] to select (pgs. 42, 43); program 2 or more memory channels (pgs. 30, memory mode for memory scan, in the main 31);...

  • Page 59: I Scan Edges Programming

    SCAN OPERATION I Scan edges programming r Push the [M/CALL•MW] for 1 sec. to program. Scan edges can be programmed in the same manner as memory channels. Scan edges are programmed into scan • 3 beeps sound and VFO is automatically selected. •...
  • Page 60 SCAN OPERATION D Programming scan edges via microphone z Set the desired frequency in VFO mode. b To program a frequency for the other scan edge channels, ➥ Push [VFO/LOCK] to select VFO mode. repeat steps z to v. ➥ Set the frequency via the keypad or [Y]/[Z]. x Push [FUNC] then [ A(MW)] momentarily.

  • Page 61: I Skip Channel Setting

    SCAN OPERATION I Skip channel setting SET MODE USING z Select a memory channel. The memory skip function speeds up scanning by checking ➥ Select memory mode by pushing [MR/CALL]. only those memory channels not set as skip channels. Set ➥...

  • Page 62: I Scan Resume Condition

    SCAN OPERATION I Scan resume condition SET MODE USING z Push [BAND] to select the desired band (left or The scan resume condition can be selected as timer or pause scan. The selected resume condition is also used for priority right) as the main band.

  • Page 63: Priority Watch

    PRIORITY WATCH I Priority watch types Priority watch checks for signals on a VFO frequency every MEMORY CHANNEL WATCH 5 sec. while operating in memory mode. The transceiver has While operating on a VFO fre- 5 sec. 3 priority watch types to suit your needs. You can also trans- quency, priority watch checks for 50 msec.

  • Page 64: I Priority Watch Operation

    PRIORITY WATCH I Priority watch operation q Select VFO mode; then, set an operating frequency in the z Select VFO mode; then, set the desired fre- PRIO desired band (left or right). quency. w Set the watching channel(s). x Set the watching channel(s). For memory channel watch: For memory channel watch: Select the desired memory channel.

  • Page 65: Dtmf Memory Encoder

    DTMF MEMORY ENCODER I Programming a DTMF code e Rotate the main band’s [DIAL] to select the desired DTMF memory channel. DTMF tones are used for autopatching, controlling other r Push [SET• equipment, etc. The transceiver has 14 DTMF memory chan- •...
  • Page 66 DTMF MEMORY ENCODER D Programming a DTMF code— via microphone b Push [VFO/LOCK] to exit the programming condition. z Push [FUNC] then [ 6(DTMF)] to turn the DTMF • The [ A(MW)] key cannot be used to exit. If pushed, code “A” DTMF encoder ON.

  • Page 67: I Transmitting A Dtmf Code

    DTMF MEMORY ENCODER I Transmitting a DTMF code D Automatic transmission (DTMF memory) D Transmitting a DTMF memory directly qPush [TONE•DTMF] for 1 sec. to turn the DTMF memory z Push [FUNC] then [ 6(DTMF)] to turn the DTMF-S encoder ON. DTMF memory encoder ON.

  • Page 68: I Dtmf Speed

    DTMF MEMORY ENCODER I DTMF speed D Manual transmission INITIAL SET MODE USING z Deactivate the DTMF memory encoder by The rate at which DTMF memories send individual DTMF DTMF-S pushing [FUNC] then [ B(D-OFF)]. characters can be set to accommodate operating needs. x Push [DTMF-S] to turn the DTMF direct selec- tion ON.

  • Page 69: Pocket Beep And Tone Squelch

    POCKET BEEP AND TONE SQUELCH I Pocket beep operation y Push [TONE•DTMF] to exit set mode. u Push [TONE•DTMF] several times until “T SQLS” or This function uses subaudible tones for calling and can be “SDTCS” are displayed to turn ON the pocket beep with used as a “common pager”...
  • Page 70 POCKET BEEP AND TONE SQUELCH z Set the operating frequency. D Available tone frequency list TSQLS x Program the CTCSS tone frequency or DTCS 67.0 79.7 94.8 110.9 131.8 156.7 171.3 186.2 203.5 229.1 code in set mode. 69.3 82.5 97.4 114.8 136.5...

  • Page 71: I Tone/Dtcs Squelch Operation

    POCKET BEEP AND TONE SQUELCH I Tone/DTCS squelch operation z Set the operating frequency. The tone or DTCS squelch opens only when receiving a sig- TSQL x Program the CTCSS tone frequency or DTCS nal with the same pre-programmed subaudible tone or DTCS code, respectively.

  • Page 72: I Tone Scan

    POCKET BEEP AND TONE SQUELCH I Tone scan r When the CTCSS tone frequency or 3-digit DTCS code is By monitoring a signal that is being operated with pocket beep, tone or DTCS squelch function, you can determine the matched, the squelch opens and the tone frequency is tone frequency or DTCS code necessary to open a squelch.

  • Page 73: Other Functions

    OTHER FUNCTIONS I Set mode • Set mode operation z Push [BAND] to select the main band. q Push the desired band’s [MAIN•BAND] to select the main x Push [ B(D-OFF)] to enter set mode. band. c Push [ B(D-OFF)] or [ C(T-OFF)] to select w Push [SET•...
  • Page 74 OTHER FUNCTIONS D D Display dimmer D D Tone squelch tone Adjust to suit lighting conditions. Sets subaudible tone frequency (both encoder and decoder) The levels 1 (dark) to 4 (bright: default) are available. for tone squelch operation. Total of 50 tone frequencies (67.0–254.1 Hz) are available.
  • Page 75 OTHER FUNCTIONS D D DTCS polarity D D Scan resume timer Sets DTCS polarities for transmission and reception from Selects scan resume timer from SCT-15 (default), SCT-10, “nn,” “nr,” “rn” and “rr.” (default: nn) SCT-5 and SCP-2. • SCT-15/10/5 : Scan pauses for 15/10/5 sec., then re- DTCS DTCS MAIN...
  • Page 76 OTHER FUNCTIONS D D Wide/Narrow setting D D Weather alert function (Left band only) U.S.A. version only Sets both the transmission and reception passband width Turns weather alert function ON and OFF. from wide and narrow. MAIN MAIN When narrow is set, the transmission deviation and reception passband width become half of the wide setting (approx.).

  • Page 77: I Initial Set Mode

    OTHER FUNCTIONS I Initial set mode POWER ON D D Entering initial set mode The initial set mode is accessed at power ON and al- q While pushing [SET• lows you to set seldom-changed settings. In this way, ] push [PWR] for 1 sec. to enter initial set mode.
  • Page 78 OTHER FUNCTIONS D D Key-touch beep D D Auto repeater U.S.A. version only The key-touch beep can be turned OFF for silent operation. The auto repeater function automatically turns ON or OFF the (default: ON) duplex operation with a specified shift direction and tone en- coder, when the operating frequency falls within or outside of MAIN MAIN...
  • Page 79 OTHER FUNCTIONS D D Cooling fan control D D Squelch delay Selects the cooling fan control condition from Auto and ON. Selects squelch delay from short and long to prevent re- • Auto (At) : The fan rotates during transmit and for 2 min. peated opening and closing of the squelch during reception after transmission.
  • Page 80 OTHER FUNCTIONS D D Active band D D Sub band mute Selects the frequency selecting condition via [DIAL] or [Y]/[Z] Turns the sub band function with sub band busy beep capa- on the microphone from all (AL) and single (SI). bility ON and OFF.

  • Page 81: I Am/Fm Narrow Mode

    I AM/FM narrow mode [ z Push [BAND] to select the desired band (left or The IC-2720H has AM mode reception for both the left and right) as the main band. right bands, and FM narrow mode is available for the left •...

  • Page 82: I Weather Channel Operation (Usa Version Only)

    OTHER FUNCTIONS I Weather channel operation alternately and sounds a beep tone until the transceiver is op- erated. The previously selected (used) weather channel is (USA version only) checked periodically during standby or while scanning. D D Weather channel selection q Select the desired weather channel.

  • Page 83: I Microphone Keys

    OTHER FUNCTIONS I Microphone keys D D [F-1]/[F-2] keys on HM-133 The following conditions in the main band or both left and The supplied HM-133’s (optional for some versions) [F-1] and right bands can be memorized into [F-1] and [F-2] keys, in- [F-2] keys memorize the transceiver conditions.

  • Page 84: I Partial Reset

    OTHER FUNCTIONS I Partial reset I ALL reset POWER ON POWER ON If you want to initialize the operating conditions (VFO fre- The function display may occasionally display erroneous in- quency, VFO settings, set mode contents) without clearing formation (e.g. when first applying power). This may be the memory contents, a partial resetting function is available caused externally by static electricity or by other factors.

  • Page 85: I Data Cloning

    OTHER FUNCTIONS I Data cloning POWER ON Cloning allows you to quickly and easily transfer the pro- w While pushing left band’s [M/CALL•MW], turn power ON to grammed contents from one transceiver to another; or , data enter cloning mode (master transceiver only— power on from a personal computer to a transceiver using the optional only for sub-transceiver).

  • Page 86: I Packet Operation

    OTHER FUNCTIONS I Packet operation D Cloning using a personal computer Data can be cloned to and from a personal computer (Mi- D Data speed crosoft ® Windows ® 98/2000/Me/XP) using the optional CS- For packet operation, the transceiver can be set to one of two 2720 and the optional cloning cable CLONING SOFTWARE...
  • Page 87 OTHER FUNCTIONS D 1200 bps packet operation q Connect the transceiver and a TNC as illustrated below. • Read the instructions supplied with your TNC carefully before attempting packet operation with the transceiver. TNC side • Pin t AF OUT is for 1200 bps operation only. This pin q DATA IN TX AUDIO cannot be used for 9600 bps operation.
  • Page 88 OTHER FUNCTIONS D 9600 bps high speed packet operation • When using the PTT P terminal for packet operation, no The transceiver supports 2 modes of 9600 bps packet opera- voice signals are transmitted from the microphone. tion: G3RUH and GMSK. •...
  • Page 89 OTHER FUNCTIONS D Adjusting the transmit signal output from D Packet operation band selection Both bands, or either the left or right band only, can be spec- the TNC ified for packet operation to suit your preference. When setting data transmission speed to 9600 bps, the data signal coming from the TNC is applied exclusively to the in- q While pushing [SET•...

  • Page 90: Maintenance

    MAINTENANCE I Troubleshooting If your transceiver seems to be malfunctioning, please check the following points before sending it to a service center. PROBLEM POSSIBLE CAUSE SOLUTION REF. Does not turn on. • Power connector has a poor contact. • Check the connector pins. —...

  • Page 91: I Fuse Replacement

    MAINTENANCE PROBLEM POSSIBLE CAUSE SOLUTION REF. Some memory channels • The memory channel number has not yet been • Select the channel via the microphone keypad to — cannot be selected via the programmed. check whether the channel has been programmed tuning dial.

  • Page 92: Specifications And Options

    SPECIFICATIONS AND OPTIONS I Specifications D D TRANSMITTER • Modulation system : Variable reactance frequency modulation • Output power : VHF 50/15/5 W* D D GENERAL (approx.) 35/15/5 W* (approx.) • Frequency coverage (unit: MHz) *25/15/5 W only for the Taiwan version. Version Left Band Right Band...

  • Page 93: I Options

    SPECIFICATIONS AND OPTIONS • Squelch sensitivity † : Less than 0.13 µV MB-84 (threshold) REMOTE CONTROLLER BRACKET • Selectivity † (typical) Same as that supplied with the transceiver. Wide More than 12 kHz/6 dB MB-85 COMBINATION BRACKET Less than 30 kHz/60 dB ⁄...

  • Page 94: Mode Arrangement

    MODE ARRANGEMENT INITIAL SET MODE VFO mode (p. 12) MAIN MAIN MAIN MAIN Key-touch beep (p. 61) Time-out timer (p. 61) V/MHz V/MHz M/CALL SCAN SCAN PRIO V/MHz SCAN MAIN MAIN MAIN MAIN M/CALL MEMORY MODE (p. 29) CALL CHANNEL (p. 38) Sub band mute (p.
  • Page 95 MODE ARRANGEMENT MAIN MAIN MAIN MAIN MAIN Auto repeater (p. 61) Auto power off (p. 61) Cooling fan (p. 62) Data speed (p. 62) Packet operation band (p. 62) (USA version only) MAIN MAIN MAIN MAIN Active band (p. 63) Squelch attenuator (p.
  • Page 96 A-6124D-1EX-w Printed in Japan 1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan 2002–2003 Icom Inc. ©...

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