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VERTEX STANDARD CO., LTD. |
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4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan |
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FM TRANSCEIVER |
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VERTEX STANDARD |
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10900 Walker Street, Cypress, CA 90630, U.S.A. |
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US Headquarters |
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FT-1807M |
YAESU EUROPE B.V. |
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P.O. Box 75525, 1118 ZN Schiphol, The Netherlands |
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YAESU UK LTD. |
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Unit 12, Sun Valley Business Park, Winnall Close |
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Technical Supplement |
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Winchester, Hampshire, SO23 0LB, U.K. |
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VERTEX STANDARD HK LTD. |
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Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road, |
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©2006 VERTEX STANDARD CO., LTD. |
EH023U90A |
Kwun Tong, Kowloon, Hong Kong |
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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 nonqualified 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 |
Board Unit (Schematics, Layouts & Parts) |
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Exploded View & Miscellaneous Parts ............ |
3 |
MAIN Unit Circuit Diagram ................................. |
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Block Diagram |
5 |
MAIN Unit Parts Layout ....................................... |
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MAIN Unit Parts List ............................................ |
17 |
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Connection Diagram .......................................... |
6 |
CNTL Unit Circuit Diagram.................................. |
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Circuit Description |
7 |
CNTL Parts Layout ............................................... |
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CNTL Parts List |
29 |
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Alignment |
9 |
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Specifications
General
Frequency Range: |
Tx 400 - 470 MHz |
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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) |
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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) |
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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
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CP8579001 |
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CASE ASSY |
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w/SP NET: S8002087 |
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M4090178 |
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SPEAKER |
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T9206438A |
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S8002118 (2 pcs) |
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CUSHION |
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WIRE ASSY |
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S8002063 |
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CAP-SP |
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ACCESSORIES |
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VXSTD P/N |
DESCRIPTION |
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AAA43X001 |
MICROPHONE (MH-48A6J) |
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T9206876 (FT-1807M) |
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T9021715 |
DC CABLE (FT-1807M) |
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T9206955 (FT-1807E) |
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G1094344 |
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T9022815 |
DC CABLE (FT-1807E) |
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WIRE ASSY |
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RA55H4047M |
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Q0000081 SPARE FUSE (15 A: FT-1807M) |
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Q0000075 SPARE FUSE (15 A: FT-1807E) |
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D6000055 |
BRACKET (MMB-36) |
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CB0297000 |
SCREW SET |
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REF. VXSTD P/N |
DESCRIPTION |
QTY. |
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e e e |
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U03310002 |
SEMS SCREW |
ASM3X10NI |
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U24112002 |
TAPTITE SCREW |
M2X12NI |
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MAIN UNIT |
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U24308002 |
TAPTITE SCREW |
M3X8NI |
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U36206007 |
TAPTITE SCREW |
M2.6X6B |
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U51320007 |
HEXA SOCKET BOLT |
M3X20B |
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part of a designated assembly. |
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T9207248 |
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WIRE ASSY |
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CNTL UNIT |
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P1091172 |
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RA0754500 |
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CONNECTOR |
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INTER CONNECTOR |
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G6090169 |
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LCD |
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RA0753800 |
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RA0753400 |
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RUBBER KNOB |
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CHASSIS |
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RA0754100
KNOB (VOL/CQL)
RA0754400
RA0754300 GROUND PLATE
REFLECTOR
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RA0754600 |
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DIFFUSER |
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RA0753600 |
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FRONT PANEL |
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gRA0754200
ENCODER KNOB
3
Note
4
Block Diagram
5
Connection Diagram
6
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 contains 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 &
Circuit Description
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 frequency 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 filter 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 proportional to the output level of the power amplifier module.
The APC Q1038 (LM2904PWR) is compared the rectified 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
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.
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.
Alignment
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
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 parameter to “435.000 rF.”
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 parameter to “435.100 tn.”
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.
50-Ohm |
RF |
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Dummy Load |
Signal Generator |
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RF Sampling |
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Inline |
Coupler |
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RF |
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Wattmeter |
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Signal Generator |
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ANT |
DC INPUT |
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Deviation Meter |
FT-1807M |
EXT SP |
SINAD Meter |
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MIC |
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Frequency |
AF |
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GND |
+8V |
Counter |
Signal Generator |
PTT/CLONE |
MIC SW2 |
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MIC INPUT |
MIC SW1 |
TEST EQUIPMENT SETUP
10
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 parameter to “435.100 tL.”
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 parameter to “435.100 S1.”
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 parameter to “435.100 S9.”
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 parameter to “435.000 HP.”
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.
Alignment
TX Power (Low 3)
Rotate the DIAL knob to set the alignment parameter to “435.000 L3.”
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 parameter to “435.000 L2.”
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 parameter to “435.000 L1.”
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 Generator.
Rotate the DIAL knob to set the alignment parameter to “435.000 dU.”
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.
11
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