This manual provides technical information necessary for servicing the VX-2500U Transceiver.
Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualifiedpersons to service this equipment may result in permanent damage not covered by the warranty, and may be illegal insome countries.
Two PCB layout diagrams are provided for each double-sided circuit board in the transceiver. Each side of thr board isreferred to by the type of the majority of components installed on that side (“leaded” or “chip-only”). In most cases oneside has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils,electrolytic capacitors, ICs, etc.), or leaded components only.
While we believe the technical information in this manual to be correct, Vertex Standard assumes no liability for dam-age that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing out anyinconsistencies in the technical information would be appreciated.
Number of Groups:10Number of Channels :128 channelsPLL Steps:5.0 kHz/6.25kHzPower Supply Voltage:13.8V DC ±15 %Channel Spacing:12.5 / 25.0 kHzCurrent Consumption(Approx.):TX: 6 A
RX: 700 mASTBY: 250 mA
Operating Temperature range:–22 °F to 140 °F (–30 °C to +60 °C)Frequency Stability:Better than ±2.5 ppmRF Input-Output Impedance:50 ohmsAudio Output Impedance:4 ohmsDimensions:6.3 x 1.6 x 4.3 inch (160 x 40 x 110 mm)Weight (Approx.):1.87 lb (0.85 kg)
Receiver(TypicalValues)
Circuit type:Double conversion Super-heterodyneSensitivity:0.25 uV (12 dB SINAD)Adjacent Channel Selectivity:80/67 dBIntermodulation:75 dBSpurious and Image Rejection:90 dBAudio Output:4 W @ 4 ohms 5% THDAudio Distortion:<3 % @1 kHz
Transmitter(TypicalValues)
Power Output:25 W (low: 5W)Modulation:16K0F3E, 11K0F3EMax Deviation:5.0/2.5 kHzConducted Spurious Emission:70 dB below carrierAudio Distortion:<3 % @ 1 kHzMicrophone type:DynamicMicrophone impedance:600 ohms
2
DSUB 9-pin Accessory Connector
Pin 1:Output Logic squelch (Will be effective this output during Data transmission – Inputting logic Low
level signal to the Pin #4 as the DTR signal)
High: Radio receiving the signal with the correct CTCSS, DCS, or LTR ID.Low: Radio not receiving the signal with the correct CTCSS, DCS, or LTR ID.
Pin 2:Output Rx discriminator (Need to set the solder short on the PCB)
JP3 (JP1503) - Flat: 10 Hz to 3.0 kHz (140 mVrms / STD deviation with 600 ohm termination)
orJP4 (JP1504) - Filtered 300 Hz to 3.0 kHz (70 mVrms / STD deviation with 600 ohm termination)* Both JP3 and JP4 are not closed from the factory.
Pin 3:Input TX data to the radio modulator. (Flat: 10 Hz to 3.0 kHz)
(40 mVrms / STD deviation)
Pin 4:Input DTR (to switch the radio operation between dispatch operation and Data mode)
[DTR Low: Turn on the Data transmission, less than 0.5 V][DTR High: Turn off the Data transmission, more than 4.0 V]
Pin 5:Ground
Pin 6:Output Horn alert signal (Open collector with maximum 16.0 V, 100 mA sink).
Pin 7:Input external PTT (effective when in the Data mode)
[Low: Request the transmission][High: Request the Receiving]
Pin 8:Output supply voltage (Need to set the solder short on the PCB)
JP1 (JP1501) Output 5.0 V (Maximum 100 mA output)
orJP2(JP1502) Output 13.8 V (Maximum 100 mA output)* Both JP1 and JP2 are not closed from the factory.
Pin 9:Input the ignition signal of the CAR.
This signal is for the following operation,
(1) Disable the Horn alert during the ignition is turned on.(2) Turn on and off the radio. This function requires the solder short JP8 (JP1508).
The VX-2500U is a UHF FM mobile transceiver designedto operate in the frequency range of 400 to 520 MHz.
2.CircuitConfigurationbyFrequency
The receiver is a double-conversion superheterodyne witha first intermediate frequency (IF) of 44.25 MHz and asecond IF of 450 kHz. Incoming signals from the antennaare mixed with the local signal from PLL to produce thefirst IF of 44.25 MHz.
This is then mixed with the 43.8 MHz second local oscil-lator (using the 14.6 MHz reference crystal) output to pro-duce the 450 kHz second IF. This is detected to give thedemodulated signal.
The transmit signal frequency is generated by PLL VCO,and modulated by the signal from the microphone. It isthen amplified and sent to the antenna.
3.ReceiveSignalPath
Incoming RF signals from the antenna connector are de-livered to the RF Unit, and pass through a low-pass filter(LPF) antenna switching network consisting of coils L1001,L1002, L1003, L1005, and L1007, capacitors C1004,C1009,C1016, C1019, and C1025, and antenna switchingdiodesD1005 andD1007 (both XB15A709A0HR) for de-livery to the receiver front end.
Signals within the frequency range of the transceiver arethen passed through a varactor-tuned bandpass filter con-sisting of L1008, L1009 before RF amplification byQ1011(2SC4227:Ver. D or 2SC4226:Ver. CS1, DS1).
The amplified RF is then band-pass filtered again by var-actor-tuned resonators L1019, L1023 to ensure pure in-band input to 1st mixer Q1026 (3SK228:Ver. D orSGM2016AM:Ver. CS1, DS1).
Buffered output from the VCO Unit is amplified byQ1021(2SC5107) and low-pass filtered by L1030/L1032 andC1184/C1188/C1192, to provide a pure 1st local signalbetween 355.75 and 475.75 MHz to the 1st mixer.
The 44.25 MHz 1st mixer product then passes throughdual monolithic crystal filters XF1001 and XF1002, and isamplified byQ1029 (2SC4215Y) and delivered to the in-put of the FM IF subsystem IC Q1028 (TA31136FN).
This IC contains the 2nd mixer, 2nd local oscillator, limit-er amplifier, FM detector, noise amplifier, and squelchgates.
The 2nd LO in the IF-IC is produced from crystal X1001(14.600 MHz), and the 1st IF is converted to 450 kHz bythe 2nd mixer and stripped of unwanted components byceramic filter CF1001 or CF1002. After passing through alimiter amplifier, the signal is demodulated by the FMdetector CD1001 (CDBC450CX24).
Detected audio fromQ1029 is applied toQ2016 (AK2345)and audio low-pass filter. After volume adjustment byQ2014 (M62364FP), the audio signal is amplified by theAF power amplifier Q1509 (TDA2003H) and passed tospeaker jack.
4.TransmitSignalPath
Voice audio from the microphone is delivered via the MIC(Jack) Unit to the PANEL Unit, after passing throughamplifier Q2022(NJM2902V), Mic gain-volume Q2014(M62364FP) pre-emphasisQ2015 (NJM2902V), and lim-iter Q2016 (IDC instantaneous deviation control), is ad-justed for optimum deviation level and delivered to thenext stage.
Voice input from the microphone and CTCSS are FM-modulated to the VCO of the synthesizer, while DCS au-dio is modulated by the reference frequency oscillator ofthe synthesizer.
Synthesizer output, after passing through diode switchD1022 (1SS321), is amplified by driver Q1022(2SC5415E), Q1025 (2SC5107:Ver. D or 2SC4226:Ver.CS1, DS1) and power module Q1014 (RA30H4452M:Ver.D, DS1 or RA30H4047M:Ver. CS1) to obtain full RF out-put. The RF energy then passes through antenna switchD1005/D1007 and a low-pass filter circuit and finally tothe antenna connector.
RF output power from the final amplifier is sampled byCM coupler and is rectified byD1011, D1012 (bothHSM88AS). The resulting DC is fed through AutomaticPower Controller Q1003 (M5223AGP), Q1002(2SC4154E), Q1032 (2SC4254E), and TH1003 to trans-mitter RF amplifier and thus the power output.
Generation of spurious products by the transmitter is min-imized by the fundamental carrier frequency being equalto the final transmitting frequency, modulated directly inthe transmit VCO. Additional harmonic suppression isprovided by a low-pass filter consisting of L1002, L1003,L1005, C1004, C1009, C1016, C1019, and C1025, resultingin more than 60dB of harmonic suppression prior to de-livery to the RF energy to the antenna.
5.PLLFrequencySynthesizer
PLL frequency synthesizer consists of the VCOQ1013(2SK508-K52: RX) andQ1015 (2SC4226-R24: TX), VCObuffersQ1018, Q1020, Q1021 (all 2SC5107-0), PLL sub-system IC Q1023 (SA7025DK:Ver. D) or Q1038(MB15A02PFV1:Ver. CS1, DS1) and 14.6 MHz referencecrystal X1001.
The frequency stability is ±2.5ppm within temperaturerange of –30 to +60 degree. The output of the 14.6 MHzreference is applied to pin 8 (Ver. D) or pin 1 (Ver. CS1,DS1) of the PLL IC.
11
Circuit Description
While receiving, VCOQ1013 oscillates between 355.75 and
475.75 MHz according to the transceiver version and theprogrammed receiving frequency. The VCO generates
355.75 to 475.75 MHz for providing to the first local sig-nal. In TX, the VCO generates 400 to 520 MHz.
The output of the VCO is amplified by the Q1020 androuted to the pin 5 (Ver. D) or pin 8 (Ver. CS1, DS1) of thePLL IC. Also the output of the VCO is amplified by the
Q1021 and routed first local/Power Module according toD1022.
PLL data is output from "DCS_E" (pin100), "CLOCK"(pin2) and "PLL_E" (pin98) of the microprocessor Q2013.The data are input to PLL IC when the channel is changedor when transmission is changed to reception and viceversa. A PLL lock condition is always monitored by thepin20 of the Q2013. When the PLL is unlocked, the ULgoes low.
6.MiscellaneousCircuits
6-1 DCS/LTR Demodulator
DCS signals are demodulated on the PANEL-UNIT, It isdemodulated byQ2116 (AK2345), amplifier Q2015, andcomparator Q2021.
6-2 CTCSS encoder/decoder
The CTCSS code is generation and encoding by CTCSSencoder/decoder IC Q2016 (AK2345).
6-3 MPU
Operation is controlled by 8-bit MPU IC Q2013(LC87F72C8A). The system clock uses a 3.6864MHz crys-tal for a time base. IC Q2003 (S-80735SN) resets the MPUwhen the power is on, and monitors the voltage of theregulated 5V power supply line.
6-4 DCS/LTR Encorder
The DCS code is generation and encoding by MPU ICQ2013 (LC87F72C8A). It is filtered byQ2021 (NJM2902V)and adjusted the level byQ2014 (M62364FP).
7.PowerSupplyCircuits
7-1 All 13.8V
13.8V is always supplied to Power AMP Q1014(RA30H4452M:Ver. D, DS1 or RA30H4047M:Ver. CS1).Switched 13.8V is supplied to AF Power AMP Q1509(TDA2003H) and 9V Regulator Q1004 (MM1216EN) and
Q1005 (2SB1201STP).
7-2 All 9V9V regulated from 13.8V byQ1004 (MM1216EN) andQ1005 (2SB1201STP).
7-3 VCO 9V
9V is filtered by Ripple Filter and is supplied to VCO Os-cillator Q1013 (2SK508-K52), Q1015 (2SC5107-O), andVCO BUFFER AMP Q1015 (2SC5107-O).
7-4 5V (RF-UNIT)
5V in RF-UNIT is regulated by REGULATOR IC Q1024(NJM78L05UA). 5V is supplied to PLL IC Q1023(SA7025DK:Ver. D) or Q1038 (MB15A02PFV1:Ver. CS1,DS1), FM IC Q1028 (TA31136FN), and Reference Oscilla-tor Q1027 (23C4116GR).
7-5 TX 9V
TX 9V is active on transmit. TX 9V is supplied to ANT SWD1005, D1007 (XB15A709A0HR) and TX DRIVER Q1022(2SC5415E), Q1025 (2SC5107-O).
7-6 RX 9V
RX 9V is active on receive. RX 9V is supplied to RX RFAMP Q1011 (2SC4227:Ver. D or 2SC4226:Ver. CS1, DS1)and MIXER Q1026 (3SK228:Ver. D or SGM2016AM:Ver.CS1, DS1).
7-7 5V (RF-UNIT)
9V from RF-UNIT is regulated to 5V by REGULATOR IC
Q2006 (NJM78L05UA) in PANEL-UNIT.
6-5 Compandor
The Compandor is active when Pin90 of Q2013(LC87F72C8A) is “High”. When the Compandor is ac-tive, MIC Audio is compressed, and detected audio is ex-panded byQ2017 (LA8630M).
12
Alignment
Introduction
The VX-2500U is carefully aligned at the factory for thespecified performance across the frequency range speci-fied for each version. Realignment should therefore notbe necessary except in the event of a component failure,or altering version type. All component replacement andservice should be performed only by an authorized Ver-tex Standard representative,or the warranty policy maybe void.
The following procedures cover the sometimes critical andtedious adjustments that are not normally required oncethe transceiver has left the factory. However, if damageoccurs and some parts subsequently are placed, realign-ment may be required. If a sudden problem occurs dur-ing normal operation, it is likely due to component fail-ure; realignment should not be done until after the faultycomponent has been replaced.
We recommend that servicing be performed only by au-thorized Vertex Standard service technicians who are ex-perienced with the circuitry and fully equipped for re-pair and alignment. Therefore, if a fault is suspected, con-tact the dealer from whom the transceiver was purchasedfor instructions regarding repair. Authorized Vertex Stan-dard service technicians realign all circuits and make com-plete performance checks to ensure compliance with fac-tory specifications after replacing any faulty components.
Those who do undertake any of the following alignmentsare cautioned to proceed at their own risk. Problemscaused by unauthorized attempts at realignment are notcovered by the warranty policy. Also, Vertex Standardreserves the right to change circuits and alignment proce-dures in the interest of improved performance, withoutnotifying owners.
Under no circumstances should any alignment be attempt-ed unless the normal function and operation of the trans-ceiver are clearly understood, the cause of the malfunc-tion has been clearly pinpointed and any faulty compo-nents replaced, and realignment determined to be abso-lutely necessary.
The following test equipment (and thorough familiaritywith its correct use) is necessary for complete realignment.Correction of problems caused by misalignment result-ing from use of improper test equipment is not coveredunder the warranty policy. While most steps do not re-quire all of the equipment listed, the interactions of someadjustments may require that more complex adjustmentsbe performed afterwards.
RequiredTestEquipment
RF Signal Generator with calibrated output level
at 1000MHz
Deviation Meter (linear detector)In-line Wattmeter with 5% accuracy at 1000MHz50Ω RF Dummy Load with power rating 100W
at 1000MHz
4ΩAF Dummy LoadRegulated DC Power Supply (standard 13.8V DC,
A 50Ω RF Dummy Load and in-line wattmeter must beconnected to the main antenna jack in all procedures thatcall for transmission, except where specified otherwise.Correct alignment is not possible with an antenna.
After completing one step, read the following step to de-termine whether the same test equipment will be required.If not, remove the test equipment (except dummy loadand wattmeter, in connected) before proceeding.
Correct alignment requires that the ambient temperaturebe the same as that of the transceiver and test equipment,and that this temperature be held constant between 68°Fand 86°F (20°C ~ 30°C). When the transceiver is broughtinto the shop from hot or cold air, it should be allowedtime to come to room temperature before alignment.
Whenever possible, alignments should be made with os-cillator shields and circuit boards firmly affixed in place.
Also, the test equipment must be thoroughly warmed upbefore beginning.
Note: Signal levels in dB referred to in the alignment pro-cedure are based on 0dBm EMF = 0.5mV.
Do not attempt to perform only a single step unless it isclearly isolated electrically from all other steps. Have alltest equipment ready before beginning, and follow all ofthe steps in a section in the order presented.
13
Alignment
Setup the test equipment as shown below, apply 13.8VDC power to the transceiver.
The transceiver must be programmed for use in the in-tended system before alignment is attempted. The RF pa-rameters are loaded from the file during the alignmentprocess.
Transceiver
Important
In order to facilitate alignment over the complete switch-ing range of the equipment it is recommended that thechannel data in the transceiver is preset as the chart be-low.
CHANNEL
CH1CH2CH3CH4
CHANNEL
SPACE
Wide
Narrow
Wide
Narrow
Ver.CS1
435.100MHz
435.100MHz
400.100MHz
459.900MHz
FREQUENCY(SIMPLEX
Ver.D
470.100MHz
470.100MHz
450.100MHz
489.900MHz
)
Ver.DS1
485.100MHz
485.100MHz
450.100MHz
519.900MHz
PLLVCV
Connect the positive lead of the DC voltmeter to
the test pointTP1007 (VCV) on the RF-Unit, asindicated in the figure, and the negative lead tochassis ground.Set the transceiver to the high band edge fre-
quency channel, then adjust coil L1017 on theUnit for 4.25V (for Ver. D) or 7.50V (for Ver. CS1,DS1) on the voltmeter.Key the transmitter, and adjust coil L1020 on the
Unit for 4.25V (for Ver. D) or 7.50V (for Ver. CS1,DS1) on the voltmeter.Next select to the low edge frequency channel
and confirm above 0.80V to 1.50V on the voltme-ter.Key the transmitter, and confirm above 1.00V to
1.60V on the voltmeter.
PLLReferenceFrequency
With the wattmeter, dummy load and frequency counterconnected to the antenna jack, and select band center fre-quency channel, key the transmitter and adjustTC1001(Lot. 1~5) or VR1001(Lot. 6~) on the RF-Unit, if neces-sary, so the counter frequency is within 100 Hz of the chan-nel center frequency for the transceiver version.
The alignment mode is accessed by “Alignment mode”command from the computer whilst switching on. And itis operated by the alignment tool automatically.
During the alignment mode, normal operation is suspend-ed. Use the alignment tool program running on PC.
L1017
TP1007
L1020
TC1001
14
RFUnit Test &Alignment Points(Lot.1~5)
Alignment
Thealignmenttooloutline
Enter to the alignment mode
To enter the alignment mode, turn the receiver off, select"Radio" then "Alignment" parameter on Clone Editor"CE52". You turn off the power of the transceiver, andturn on the transceiver. When the command has been suc-cessful, a message on the computer screen will confirmthat the transceiver is now in the alignment mode.
Alignment Sequence
Although the data displayed on the computer screen dur-ing alignment is temporary data, it is important you fol-low the basic alignment sequence precisely, so that thedisplayed data and the data loaded into the transceiverare identical.
Basic Alignment Sequence
1.Enter the alignment mode
2.Upload data from transceiver
3.Align data
4.Download data to transceiver
Menuofthetool
TX Power (High)
This parameter is used to align TX High power.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
To adjustment click the left mouse button on the
"Power High" then "Start" button.
L1017
TP1007
L1020
VR1001
RFUnit Test &Alignment Points(Lot.6~)
15
Alignment
Move the Slide bar, as needed, to set the power
output to the following specification, as indicatedon the external wattmeter.
TX Power (High): 25[W] (±0.5W)
When the 25Watt level is attained, press the "OK"
box to lock in the new data.
TX Power (Low)
This parameter is used to align TX Low power.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
When the 5Watt level is attained, press the "OK"
box to lock in the new data.
Max Deviation
This parameter is used to align Max Deviation.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
To adjustment click the left mouse button on the
"Power Low" then "Start" button.
Move the Slide bar, as needed, to set the power
output to the following specification, as indicatedon the external wattmeter.
TX Power (Low): 5[W] (±0.1W)
Adjust the AF generator output level to
39mVrms(-26dBm) at 2 kHzto the pin3 of theJ1502 (D-sub 9pin).
To adjustment click the left mouse button on the
"Maximum deviation" then "Start" button.
16
Alignment
Move the Slide bar, as needed, to set the Max
Deviation (Wide) to the following specification,as indicated on the deviation meter.
Max Deviation (Wide): 2.8[kHz](±0.1[kHz])
When the desired deviation level is attained,
press "OK" to lock in the new data.
Set the transceiver to CH#2, and set the Max De-
viation (Narrow) to the following specification,as indicated on the deviation meter.
Max Deviation (Narrow): 1.4[kHz](±0.1[kHz])
When the desired deviation level is attained,
press "OK" to lock in the new data.
To adjustment click the left mouse button on the
"Modulation balance" then "Start" button.
Move the Slide bar, as needed, to set the modula-
tion (Wide) wave as follows.
When the desired the modulation wave is at-
tained, press "OK" to lock in the new data.
Modulation balance
This parameter is used to align Modulation balance.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
Adjust the AF generator output level to
774mVrms(0dBm) at 300Hz to the pin3 of theJ1502 (D-sub 9pin).
Set the transceiver to CH#2, and set the modula-
tion (Narrow) wave as follows.
When the desired deviation level is attained,
press "OK" to lock in the new data.
OKNGNG
17
Alignment
CTCSS Modulation
This parameter is used to align CTCSS deviation.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
To adjustment click the left mouse button on the
"CTCSS deviation" then "Start" button.
DCS Modulation
This parameter is used to align DCS deviation.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
To adjustment click the left mouse button on the
"DCS deviation" then "Start" button.
Move the Slide bar, as needed, to set the CTCSS
deviation (Wide) to the following specification.
CTCSS Deviation(Wide): 0.70[kHz](±0.1[kHz])
When the desired deviation level is attained,
press "OK" to lock in the new data.
Set the transceiver to CH#2, and set the CTCSS
deviation (Narrow) to the following specification.
CTCSS Deviation(Narrow): 0.35[kHz](±0.1[kHz])
When the desired deviation level is attained,
press "OK" to lock in the new data.
Move the Slide bar, as needed, to set the DCS
deviation (Wide) to the following specification.
DCS Deviation(Wide) : 0.80[kHz](±0.1[kHz])
When the desired deviation level is attained,
press "OK" to lock in the new data.
Set the transceiver to CH#2, and set the DCS de-
viation (Narrow) to the following specification.
DCS Deviation(Narrow): 0.40[kHz](±0.1[kHz])
When the desired deviation level is attained,
press "OK" to lock in the new data.
18
Alignment
RX Tune
This parameter is used to RX Tune.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
Set the SG output level to -4dBµ EMF with 3kHz
deviation.
To adjustment click the left mouse button on the
"RX Tune" then "Start" button.
Tight Noise SQL
This parameter is used to Tight Noise SQL.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
Set the SG output level to 0dBµ EMF with 3.0kHz
deviation.
To adjustment click the left mouse button on the
"Tight Noise SQL" then "Start" button.
Move the Slide bar, as needed, to set the mini-
mum level for "Receiver Noise Level" bar.
When the desired RX Tune is attained, press "OK"
to lock in the new data.
Press "OK" to lock in the new data.
19
Alignment
Set the transceiver to CH#2 via the "Channel" box
located upper right corner on the "Alignment"window previously.
Set the SG output level to 0dBµ EMF with 1.5
kHz deviation.
To adjustment click the left mouse button on the
"Tight noise SQL" then "Start" button.
Threshold Noise SQL
This parameter is used to Threshold noise SQL.
Set the transceiver to CH#1 via the "Channel" box
located upper right corner on the "Alignment"window previously.
Set the SG output level to -7dBµ EMF with 3kHz
deviation.
To adjustment click the left mouse button on the
"Threshold noise SQL" then "Start" button.
Press "OK" to lock in the new data.
Press "OK" to lock in the new data.
20
Set the transceiver to CH#2 via the "Channel" box
located upper right corner on the "Alignment"window previously.
Set the SG output level to -7dBµ EMF with 1.5
kHz deviation.
To adjustment click the left mouse button on the
"Threshold noise SQL" then "Start" button.
Alignment
Press "OK" to lock in the new data.
21
Note
22
RF Unit Jumper Information
JP1501 (JP1):Determine theoutput supply voltage at pin 8 of DSUB 9-pin Accessory Connector.
Close: +5.0 V (Maximum 100 mA)Open: No Action
JP1502 (JP2):Determine the output supply voltage at pin 8 of DSUB 9-pin Accessory Connector.
Close: +13.8 V (Maximum 100 mA)Open: No Action
JP1503 (JP3):Determine the Rx discriminator output characteristic at pin 2 of DSUB 9-pin Accessory Connec-
tor.Close: Flat 10 Hz to 3.0 kHz (140 mVrms / STD deviation with 600 ohm termination)Open: No Action
JP1504 (JP4):Determine the Rx discriminator output characteristic at pin 2 of DSUB 9-pin Accessory Connec-
tor.Close: Filtered 300 Hz to 3.0 kHz (70 mVrms / STD deviation with 600 ohm termination)Open: No Action
JP1505 (JP5):No Action (Spare Jumper).
JP1506 (JP6):Define whether the TX Data Input at pin 3 of DSUB 9-pin Accessory Connector shall be "on" or
"off" according to the external PTT Input signal signal (pin 7 of DSUB 9-pin Accessory Connec-tor).Close: on (Enabled)Open: off (Disabled)
JP1507 (JP7):Determine the TX Data Input level at pin 3 of DSUB 9-pin Accessory Connector.
Close: 400 mVrms / STD deviation with 600 ohm terminationOpen: 40 mVrms / STD deviation with 600 ohm termination
JP1508 (JP8):Define whether the Transceiver's power shall be "on" or "off" according to the Ignition Signal
Input (pin 9 of DSUB 9-pin Accessory Connector).Close:Turn the transceiver on when the Ignition Signal Input (pin 9 of DSUB 9-pin Accessory
Connector) is turned to "High" while the VOL/PWR knob is set to the "ON" position (outof the click-stop position).
Open:No Action
23
Clone
The VX-2500 includes a convenient “Clone” feature,which allows the programming data from one trans-ceiver to be transferred to anotherVX-2500. Here isthe procedure for Cloning one radio's data to anoth-er.
Note: Enable the "Clone" function in the [Common2-Radio advanced setting] menu of the CE52.
1.Turn both transceivers off.
2.Connect the optional CT-4 cloning cable betweenthe Microphone jacks of the two transceivers.
3.Press and hold the AButton andButton while turning the transceiver on.
4."CLONE" will appear on the displays both trans-ceivers when clone mode is successfully activat-ed in this step.
5.On the Destination transceiver, press the Down]Button. "LOADING" will appear on theLCD.
[
Ch.Down
[
Ch.
[
6.Press the ceiver, "SENDING" will appear on the sourcetransceiver, and the data will be transferred.
7.If there is a problem during the cloning process,sound an error beep from source the transceiver.Check your cable connections and battery volt-age, and try again.
8.After completing the data transfer (clone),"COMPLETE" will appear on the LCD. Tunetransceiver off and disconnect the CT-4 cable.You can then turn the transceiver back on and
]
begin normal operation.
Ch.Up]Button on the source trans-
24
Optionalcable:CT-4
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