Vertex Standard FT-1807M User Manual
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
FM TRANSCEIVER
FT-1807M
Technical Supplement
©2006 VERTEX STANDARD CO., LTD. EH023U90A
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
YAESU EUROPE B.V.
P.O. Box 75525, 1118 ZN Schiphol, The Netherlands
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
Introduction
This manual provides technical information necessary for servicing the FT-1807M FM Transceiver.
Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-
qualified persons to service this equipment may result in permanent damage not covered by the warranty,
and may be illegal in some countries.
Two PCB layout diagrams are provided for each double-sided circuit board in the Transceiver. Each side of is
referred to by the type of the majority of components installed on that side (“leaded” or “chip-only”). In most
cases one side 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 damage that may occur as a result of typographical or other errors that may be present. Your
cooperation in pointing out any inconsistencies in the technical information would be appreciated.
Important Note
This transceiver was assembled using Pb (lead) free solder, based on the RoHS specification.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on
this apparatus. The solder stated above utilizes the alloy composition required for compliance with the
lead-free specification, and any solder with the above alloy composition may be used.
Contents
Specifications ......................................................2
Exploded View & Miscellaneous Parts............3
Block Diagram....................................................5
Connection Diagram..........................................6
Circuit Description.............................................7
Alignment............................................................9
Board Unit (
MAIN Unit Circuit Diagram .................................13
MAIN Unit Parts Layout .......................................15
MAIN Unit Parts List ............................................17
CNTL Unit Circuit Diagram..................................27
CNTL Parts Layout ............................................... 28
CNTL Parts List ....................................................29
Schematics, Layouts & Parts
)
Specifications
General
Frequency Range: Tx 400 - 470 MHz
Rx 400 - 470 MHz
Channel Step: 5/10/12.5/15/20/25/50/100 kHz
Standard Repeater Shift: ±600 kHz
Frequency Stability: Better than ±5 ppm (–20 °C to +60 °C)
Modes of Emission: F2D/F2A/F3E
Antenna Impedance: 50 Ohms, unbalanced
Supply voltage: 13.8 V DC ±15%, negative ground
Current Consumption (typical): Rx: less than 0.7 A, less than 0.3 A (squelched)
Tx: 10 A (50 W) /7 A (25 W) /5 A (10 W) /4 A (5 W)
Operating Temperature Range: –20° C to +60° C
Case Size (WxHxD): 140 x 40 x 146 mm (w/o knobs)
Weight (Approx.): 1.2 kg
Transmitter
Output Power: 50 W/25 W/10 W/5 W
Modulation Type: Variable Reactance
Maximum Deviation: ±5 kHz (Wide)/±2.5 kHz (Narrow)
Spurious Radiation: Better than –60 dB
Microphone Impedance: 2 k-Ohms
Receiver
Circuit Type: Double Conversion Superheterodyne
Ifs: 47.25 MHz & 450 kHz
Sensitivity (for 12dB SINAD): Better than 0.2 µV
Selectivity (–6/–60dB): 12 kHz/28 kHz (Wide)
9 kHz/22 kHz (Narrow)
IF Rejection: Better than 70 dB
Image Rejection: Better than 70 dB
Maximum AF Output: 3 W into 4 Ohms @10 % THD
Specifications subject to change without notice or obligation. Specifications guaranteed only within Amateur band.
Frequency ranges and functions will vary according to transceiver version; check with your dealer.
2
Exploded View & Miscellaneous Parts
VXSTD P/N
AAA43X001
T9021715
T9022815
Q0000081
Q0000075
D6000055
CB0297000
REF.
VXSTD P/N
U03310002
c
U24112002
d
U24308002
e
U36206007
f
U51320007
g
ACCESSORIES
DESCRIPTION
MICROPHONE (MH-48A6J
DC CABLE (FT-1807M
DC CABLE (FT-1807E
SPARE FUSE (15 A: FT-1807M
SPARE FUSE (15 A: FT-1807E
BRACKET (MMB-36
SCREW SET
DESCRIPTION
SEMS SCREW ASM3X10NI
TAPTITE SCREW M2X12NI
TAPTITE SCREW M3X8NI
TAPTITE SCREW M2.6X6B
HEXA SOCKET BOLT M3X20B
)
)
)
)
f
f
f
f
f
f
f
CP8579001
CASE ASSY
w/SP NET: S8002087
T9206438A
WIRE ASSY
f
f
M4090178
SPEAKER
S8002118 (2 pcs)
CUSHION
S8002063
CAP-SP
c
c
T9206876 (FT-1807M)
T9206955 (FT-1807E)
WIRE ASSY
)
)
e
e
e
e
e
e
QTY.
4
4
11
9
3
e
c
c
e
G1094344
RA55H4047M
e
MAIN UNIT
Non-designated parts are available only as
part of a designated assembly.
RA0754500
INTER CONNECTOR
G6090169
RA0753800
RUBBER KNOB
RA0754100
KNOB (VOL/CQL)
LCD
g
g
g
RA0754200
ENCODER KNOB
CNTL UNIT
RA0753600
FRONT PANEL
T9207248
WIRE ASSY
RA0754600
DIFFUSER
d
d
RA0754300
REFLECTOR
d
d
RA0754400
GROUND PLATE
e
e
P1091172
CONNECTOR
RA0753400
CHASSIS
3
Note
4
Block Diagram
5
Connection Diagram
6
Circuit Description
Receive Signal Path
Incoming RF signal is from the antenna jack is delivered to the Main Unit and passed through the lowpass filter network consisting capacitors C1213,
C1236, C1239, & C1238 and coils L1017, L1018, &
L1019, antenna switching diode D1020 and D1028
(both RLS135), delivery to the RF amplifier Q1045
(3SK296ZQ). The amplified RF signal is passed
through the another varactor-tuned band-pass filter
consisting of capacitors C1198, C1199, C1200, C1290,
C1218, C1249, C1251, C1219, C1248, C1221 & C1268,
coils L1012, L1015, & L1026, and diodes D1017,
D1021 and D1025 (both HVC350B). The amplified
RF signal is passed through the another varactortuned band-pass filter consisting of capacitors C1198,
1199, 1200, & 1218, coils L1012 and L1015, and diodes D1017 and D1021 (both HVC350B), then applied to the 1st mixer Q1037 (3SK296ZQ) along with
the first local signal from the PLL circuit.
The first local signal is generated between 352.75
MHz and 422.75 MHz by the VCO, which consists
of Q1009 (2SC5374) and varactor diode D1002
(HVC355B) according to the receiving frequency.
IF and Audio Circuits
The 47.25 MHz first IF signal is applied to the monolithic crystal filters XF1001 and XF1002 which strip
away unwanted mixer products, and the IF signal is
applied to the first IF amplifier Q1032 (2SC4400).
The amplified first IF signal is then delivered to the
FM IF subsystem IC Q1028 (NJM2591V), which con-
tains the second mixer, limiter amplifier, noise amplifier, and FM detector.
The 46.8 MHz second local signal which is made from
quadrupled 11.7 MHz crystal X1001 produces the 450
kHz second IF signal when mixed with first IF signal within Q1028 (NJM2591V).
The 450 kHz second IF signal is applied to the ceramic filter CF1001 (for Narrow FM) or CF1002 (for
Wide FM) which strip away unwanted mixer products to the ceramic discriminator CD1001 which removes any amplitude variations in the 450 kHz IF
signal before detection of speech.
The detected audio from the Q1028 (NJM2591V)
passes through the de-emphasis circuit consisting of
resistors R1082 & R1113, and capacitors C1120 &
C1122, to the audio mute gate Q1034 (2SJ364).
The audio signal passes through a band-pass filter
consisting of Q1046 and Q1047 (both 2SC4154), and
the audio mute gate Q1039 (2SJ347), to the audio
VR which adjusts the audio sensitivity to compensate for audio level variations. The adjusted audio
signal is delivered to the audio amplifier Q1035
(LA4425A) which provides up to 3 Watts, to the external speaker jack or a 4-Ohm loudspeaker.
Squelch Control
When no carrier received, the noise signal from
Q1028 (NJM2591V) is amplified by Q1051
(2SC4617), and is detected by D1011 and D1013
(both DA221). The resulting DC voltage passes
through the SQL knob to main CPU Q2002
(HD64F2266TF13). While no carrier is received,
main CPU Q2002 (HD64F2266TF13) control Q1048
(CD4094BPWR), thus, audio mute gate Q1034
(2SJ364) and Q1039 (2SJ347) turns “OFF” to disable the audio output from the speaker.
Transmit Signal Path
The speech signal from the microphone is amplified
by Q1049 (LA2902PWR). The amplified speech signal is subjected to the low-pass filter network Q1049
(LA2902PWR) to deviation controlled by Q1043
(M62364FP).
The adjusted speech signal from Q1043 (M62364FP)
is delivered to VCO Q1009 (2SC5374) which fre-
quency modulates the transmitting VCO made up
of D1004 (HSC277).
The modulated transmit signal passes through buffer amplifier Q1010 and Q1023 (both 2SC5374).
The transmit signal applied to the drive amplifier
Q1026 (2SC5226), then finally amplified by power
amplifier module Q1030 (RA55H4047M) up to 50
Watts. The APC circuit controls the Q1030
(RA55H4047M) power amplifier’s gain.
The 50 Watts RF signal passes through low-pass filter network consisting of Capacitors C1210 and
C1211 and coil L1013, antenna switch D1018 and
D1019 (both XB15A709), and another low-pass fil-
ter network consisting capacitors C1213, C1236, &
C1239, C2038 and coils L1017, L1018, & L1019, and
then deliver to the ANT jack.
7
Circuit Description
TX APC Circuit
A portion of the power amplifier module output is
rectified by D1022 (1SS321), then delivered to APC
Q1038 (LM2904PWR), as a DC voltage which is pro-
portional to the output level of the power amplifier
module.
The APC Q1038 (LM2904PWR) is compared the rec-
tified DC voltage from the power amplifier module
and the reference voltage from the main CPU Q2002
(HD64F2266TF13), to produce a control voltage,
which regulates supply voltage to the power amplifier module Q1030 (RA55H4047M), so as to maintain stable output power under varying antenna
loading condition.
PLL
A portion of the output from the VCO Q1009
(2SC5374) passes through the buffer amplifier
Q1010 and Q1017 (both 2SC5374), then delivered
to the programmable divider section of the PLL IC
Q1011 (MB15A01PFV1), which divided according
to the frequency dividing data that is associated with
the setting frequency input from the main CPU
Q2002 (HD64F2266TF13). It is then sent to the phase
comparator section of the PLL IC Q1011
(MB15A01PFV1).
The 11.7 MHz frequency of the reference oscillator
circuit made up of X1001 is divided by the reference
frequency divider section of Q1011 (MB15A01PFV1)
into 2340 or 1872 parts to become 5 kHz or 6.25 kHz
comparative reference frequencies, which are utilized
by the phase comparator section of Q1011
(MB15A01PFV1).
The phase comparator section of Q1011
(MB15A01PFV1) compares the phase between the
frequency-divided oscillation frequency of the VCO
circuit and comparative frequency and its output is
a pulse corresponding to the phase difference. This
pulse is integrated by the charge pump and loop filter into a control voltage (VCV) to control the oscillation frequency of the VCO Q1009 (2SC5374).
8
Alignment
Introduction
The FT-1807M is carefully aligned at the factory for
the specified performance across the amateur band.
Realignment should therefore not be necessary except in the event of a component failure. Only an
authorized Vertex Standard representative should
perform all component replacement and service, or
the warranty policy may be void.
The following procedures cover the adjustments that
are not normally required once the transceiver has
left the factory. However, if damage occurs and some
parts subsequently are replaced, realignment may
be required. If a sudden problem occurs during normal operation, it is likely due to component failure;
realignment should not be done until after the faulty
component has been replaced.
We recommend that servicing be performed only by
authorized Vertex Standard service technicians who
are experienced with the circuitry and fully equipped
for repair and alignment. If a fault is suspected, contact the dealer from whom the transceiver was purchased for instructions regarding repair. Authorized
Vertex Standard service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifications after replacing any faulty components.
Those who do undertake any of the following alignments are cautioned to proceed at their own risk.
Problems caused by unauthorized attempts at realignment are not covered by the warranty policy.
Also, Vertex Standard reserves the right to change
circuits and alignment procedures in the interest of
improved performance, without notifying owners.
Required Test Equipment
The following test equipment (and familiarity with
its use) is necessary for complete realignment. Correction of problems caused by misalignment resulting from use of improper test equipment is not covered under the warranty policy. While most steps
do not require all of the equipment listed, the interactions of some adjustments may require that more
complex adjustments be performed afterwards.
Do not attempt to perform only a single step unless
it is clearly isolated electrically from all other steps.
Have all test equipment ready before beginning and,
follow all of the steps in a section in the order presented.
RF Signal Generator with calibrated output level
at 500 MHz
Deviation Meter (linear detector)
In-line Wattmeter with 5% accuracy at 500 MHz
50-Ohm 100-W RF Dummy Load
8-Ohm AF Dummy Load
Regulated DC Power Supply adjustable from 9 to
16.5 VDC, 15A
Frequency Counter: 0.2-ppm accuracy at 500 MHz
AF Signal Generator
AC Voltmeter
DC Voltmeter: high impedance
UHF Sampling Coupler
SINAD Meter
Under no circumstances should any alignment be
attempted unless the normal function and operation
of the transceiver are clearly understood, the cause
of the malfunction has been clearly pinpointed and
any faulty components replaced, and realignment
determined to be absolutely necessary.
9
Alignment
Alignment Preparation & Precautions
A 50-Ohm RF load and in-line wattmeter must be
connected to the antenna jack in all procedures that
call for transmission; alignment is not possible with
an antenna. After completing one step, read the next
step to see if the same test equipment is required. If
not, remove the test equipment (except dummy load
and wattmeter, if connected) before proceeding.
Correct alignment requires that the ambient temperature be the same as that of the transceiver and test
equipment, and that this temperature be held constant between 20 °C ~ 30 °C. When the transceiver is
brought into the shop from hot or cold air, it should
be allowed some time to come to room temperature
before alignment. Whenever possible, alignments
should be made with oscillator shields and circuit
boards firmly affixed in place. Also, the test equipment must be thoroughly warmed up before beginning.
Note: Signal levels in dB referred to in the alignment
procedure are based on 0dBµ = 0.5µV.
Test Setup
Set up the test equipment as shown below for transceiver alignment.
Entering the Alignment Mode
Alignment of the FT-1807M is performed using a
front panel software-based procedure. To perform
alignment of the transceiver, it must first be placed
in the “Alignment Mode,” in which the adjustments
will be made and then stored into memory.
To enter the Alignment mode, press and hold in the
[
REV(DW)] and [D/MR(MW)] keys while turning the
radio on. Once the radio is on, release these two key.
The transceiver is now in the “Alignment Mode.”
PLL Reference Frequency
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “PLL Reference Frequency.”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the counter frequency
reading is 435.100 MHz (±200 Hz).
Press the [D/MR(MW)] key.
RF Front-end Tuning
Inject a 435.100 MHz signal at a level of –10 dBµ
(with 1 kHz modulation @±3.5 kHz deviation)
from the RF signal generator.
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “RF Front-end Tuning.”
Adjust the DIAL knob so that the maximum
SINAD.
Press the [D/MR(MW)] key.
435.000 rF435.000 rF
435.000 rF.”
435.000 rF435.000 rF
435.100 tn435.100 tn
435.100 tn.”
435.100 tn435.100 tn
10
50-Ohm
Dummy Load
Inline
Wattmeter
Frequency
Counter
RF
Signal Generator
RF Sampling
Coupler
ANT
Signal Generator
TEST EQUIPMENT SETUP
FT-1807M
MIC
AF
DC INPUT
EXT SP
RF
Signal Generator
SINAD MeterDeviation Meter
GND +8V
MIC INPUT
PTT/CLONE
MIC SW1
MIC SW2
Alignment
Squelch Threshold Level
Inject a 435.100 MHz signal at a level of –14 dBµ
(with 1 kHz modulation @±3.5 kHz deviation)
from the RF signal generator.
Rotate the SQL knob to the 10-o’clock position.
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “Squelch Threshold Level.”
Press the [D/MR(MW)] key three times.
Press the [D/MR(MW)] key.
S-meter Level (S-1)
Inject a 435.100 MHz signal at a level of –5 dBµ
(with 1 kHz modulation @±3.5 kHz deviation)
from the RF signal generator.
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “S-meter Level (S-1).”
Press the [D/MR(MW)] key three times.
Press the [D/MR(MW)] key.
S-meter Level (S-9)
Inject a 435.100 MHz signal at a level of +23 dBµ
(with 1 kHz modulation @±3.5 kHz deviation)
from the RF signal generator.
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “S-meter Level (S-9).”
Press the [D/MR(MW)] key three times.
Press the [D/MR(MW)] key.
TX Power (High)
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Power (High).”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the RF Power Meter
reading is 50 W (±1.0W).
Press the [D/MR(MW)] key.
435.100 tL435.100 tL
435.100 tL.”
435.100 tL435.100 tL
435.100 S1435.100 S1
435.100 S1.”
435.100 S1435.100 S1
435.100 S9435.100 S9
435.100 S9.”
435.100 S9435.100 S9
435.000 HP435.000 HP
435.000 HP.”
435.000 HP435.000 HP
TX Power (Low 3)
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Power (Low 3).”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the RF Power Meter
reading is 25 W (±1.0 W).
Press the [D/MR(MW)] key.
TX Power (Low 2)
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Power (Low 2).”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the RF Power Meter
reading is 10 W (±0.5 W).
Press the [D/MR(MW)] key.
TX Power (Low 1)
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Power (Low 1).”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the RF Power Meter
reading is 5 W (±0.5 W).
Press the [D/MR(MW)] key.
TX Deviation
Inject a 1 kHz, 50 mV signal from the Audio Gen-
erator.
Rotate the DIAL knob to set the alignment param-
eter to “
Press the [D/MR(MW)] key to enable adjustment
of the “TX Deviation.”
Press the PTT switch to activate the transmitter,
adjust the DIAL knob so that the Deviation Meter
reading is 4.2 kHz (±0.1 kHz).
Press the [D/MR(MW)] key.
435.000 L3435.000 L3
435.000 L3.”
435.000 L3435.000 L3
435.000 L2435.000 L2
435.000 L2.”
435.000 L2435.000 L2
435.000 L1435.000 L1
435.000 L1.”
435.000 L1435.000 L1
435.000 dU435.000 dU
435.000 dU.”
435.000 dU435.000 dU
11
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