Daniels MT-3 User manual
Copyright © 2005 Daniels Electronics Ltd. All rights reserved. No
part of this publication may be reproduced, stored in a retrieval system
or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording or otherwise, without the prior written consent
of Daniels Electronics Ltd.
DE™ is a registered trademark of Daniels Electronics Ltd. registered in
the U.S. Patent and Trademark Office.
Document Number:
Revision:
Revision Date:
Daniels Electronics Ltd.
Victoria, BC
PRINTED IN CANADA
MT-3 LOW CURRENT
FRONT END
INSTRUCTION MANUAL
132-174 MHZ 406-470 MHZ
Covers Models:
A11-FEF3/150
A11-RFAMP3/150
A13-FEF3/400
A13-RFAMP3/400
IM11-FE3
2-0-2
Aug 2005
MT-3 Low Current Front End Instruction Manual
IM11-FE3
ii
This document has been produced, verified and controlled in
accordance with Daniels Electronics’ Quality Management System
requirements.
Please report any errors or problems to Daniels Electronics’ Customer
Service Department.
The user’s authority to operate this equipment could be revoked through
any changes or modifications not expressly approved by Daniels
Electronics Ltd.
The design of this equipment is subject to change due to continuous
development. This equipment may incorporate minor changes in detail
from the information contained in this manual.
DOCUMENT CONTROL
NOTE
MT-3 Low Current Front End Instruction Manual
IM11-FE3
iii
Contents
General Information ...............................................................1
Introduction ................................................................................................1
Performance Specifications ....................................................................... 1
Theory of Operation ...............................................................3
General ......................................................................................................3
Power and Interconnection ........................................................................3
Five Pole Helical Filter ............................................................................... 3
RF Amp ......................................................................................................4
Image Rejection Filter ................................................................................4
Local Oscillator Input .................................................................................4
Double Balanced Mixer ..............................................................................4
Front End Alignment ..............................................................5
General ......................................................................................................5
Repair Note ................................................................................................5
Recommended Test Equipment .................................................................5
Check Points ..............................................................................................5
Tuning Procedure .......................................................................................6
MT-3 Front End Removal and Installation ..................................................6
Illustrations and Schematics ..................................................7
VHF Front End Component Layout ............................................................8
UHF Front End Component Layout ...........................................................9
VHF/UHF Front end Schematic diagram ................................................. 10
VHF/UHF front End Tuning Diagram ....................................................... 10
Parts List ...............................................................................11
Electrical Parts List .................................................................................. 11
Mechanical Parts List ............................................................................... 13
Revision History ................................................................... 15
MT-3 Low Current Front End Instruction Manual
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MT-3 Low Current Front End Instruction Manual
IM11-FE3
1
GENERAL
INFORMATION
INTRODUCTION
The MT-3 Front End is a highly integrated,
frequency selective, down converter used in
Daniels Electronics standard MT-3 FM receiver
product line. RF signals at the antenna input
are filtered by a 5 pole helical filter, amplified
through a low noise amplifier, filtered again
by a seven pole low pass or high pass filter,
and then mixed, with an externally supplied
local oscillator, to produce an IF frequency of
21.4 MHz. The Front End’s two main bands of
operation are 132 to 174 MHz and 406 to 470
MHz. Power for the Front End is supplied from
the receiver’s regulated +9.5 volts at a typical
current consumption of 8 mA. All Front End ports
(antenna input, local oscillator input, and IF
output) are designed for 50 Ω terminations.
PERFORMANCE SPECIFICATIONS
Frequency Range: 132 MHz - 174 MHz (VHF)
406 MHz - 470 MHz (UHF)
Bandwidth (3 dB): greater than 5 MHz (VHF Preselector Filter)
greater than 7 MHz (UHF Preselector Filter)
Conversion Gain: typically 12 dB (VHF)
typically 6 dB (UHF)
IF Frequency: 21.4 MHz
Local Oscillator Injection: +7 dBm maximum, high or low side injection
depending on frequency band
Impedance: 50 Ω at all ports
Power Requirements: 8 mA at +9.5 Vdc
MT-3 Low Current Front End Instruction Manual
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MT-3 Low Current Front End Instruction Manual
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3
THEORY OF
OPERATION
GENERAL
The MT-3 Front End consists of a five pole
helical resonator filter structure with a single
stage, low noise, bipolar amplifier followed by
an image rejection filter and a double balanced
mixer. The highly selective narrow bandwidth of
the helical filter provides high out-of-band signal
rejection, high receiver spurious response, and
high wide band intermodulation attenuation. The
low noise amplifier increases receiver sensitivity
while the image rejection filter increases the
receiver’s image frequency attenuation. After
filtering and amplification, the received signal
is down converted to 21.4 MHz by a double
balanced mixer. The MT-3 Front End is built in
a VHF (132 to 174 MHz) and two UHF (406 to
430 MHz and 450 to 470 MHz) versions. MT-3
Front End tuning over the respective frequency
ranges is done through helical filter adjustment
and image rejection filter selection.
POWER AND
INTERCONNECTION
The MT-3 Front End operates from +9.5 Vdc
applied via a short red wire connected to supply
point J6-2 on the receiver main IF/audio board.
Ground return is supplied via direct mounting
to the receiver chassis and coaxial cable
interconnections. The MT-3 Front End draws
approximately 8 mA from the IF/audio board’s
+9.5 Vdc supply.
The RF input signal connected to the receiver
front panel type N connector is fed to the front
end SMB input connector (J1) by a short coaxial
cable. The MT-3 Front End’s local oscillator
input and IF output are respectively routed by
coaxial cable from the local oscillator module
and to SMB connector J7 on the main IF/audio
board.
FIVE POLE HELICAL FILTER
The received RF signal is filtered by a five pole
helical resonator band pass filter. This filter
provides front end selectivity and attenuates any
potential internally generated spurious signals.
Typically, the filter has an insertion loss of 3 dB
and a 3 dB bandwidth of 5.0 MHz in the VHF
range and an insertion loss of 4.5 dB and a 3 dB
bandwidth of 7.0 MHz in the UHF range. The
filter is tunable from 132 to 174 MHz for VHF
applications and 406 to 430 MHz or 450 to 470
MHz for UHF applications through adjustment of
the helical filter’s five trimmer capacitors.
MT-3 Low Current Front End Instruction Manual
IM11-FE3
Theory of Operation
4
RF AMP
The output from the five pole helical filter is
coupled through impedance matching network
L4 and C9 to the base of RF amplifier Q2. The
RF amplifier stage is supplied by the regulated
+9.5 Vdc line and typically draws 8 mA of
collector current. Transistor Q2 provides high
gain, typically 20 dB in the VHF band and 16 dB
in the UHF band, and low noise figure typically
2.5 dB in the both bands, for increased receiver
sensitivity. Transistor Q1 actively regulates
the bias to RF transistor Q2. The output signal
is coupled to an image rejection filter via
impedance matching network C11 and L2 (VHF)
or L3 (UHF).
IMAGE REJECTION FILTER
The amplified RF signal is followed by a 7 pole
Chebyshev lowpass or highpass image rejection
filter which further rejects the image frequency.
The image filter topology (either lowpass or
highpass) depends on if the Front End is using
lowside or highside local oscillator injection. The
lowpass image filter consists of capacitors C16
to C19 and inductors L8 to L10. The highpass
image filter consists of capacitors C12 to C15
and inductors L5 to L7. Jumpers JU1 and JU2
are used to select the appropriate filter for the
desired receive frequency band. The table below
summarizes the receive frequency, whether
lowside or highside injection is used, and which
filter is installed.
MT-3 Front End Image Filter Selection
Frequency Band Local Oscillator Injection Image Filter
132 to 150 MHz Highside: RF + 21.4 MHz Lowpass: JU1 and JU2 - B side installed
150 to 174 MHz Lowside: RF - 21.4 MHz Highpass: JU1 and JU2 - A side installed
406 to 430 MHz Highside: RF + 21.4 MHz Lowpass: JU1 and JU2 - B side installed
450 to 470 MHz Lowside: RF - 21.4 MHz Highpass: JU1 and JU2 - A side installed
470 to 490 MHz Lowside: RF - 21.4 MHz contact factory
490 to 512 MHz Lowside: RF - 21.4 MHz contact factory
Note: There is an error in the silkscreen on PCB v1.0. JU1 A & B designations are reversed.
LOCAL OSCILLATOR INPUT
The MT-3 Front End local oscillator input port
(50 Ω) connects directly to a double balanced
mixer (M1). Any one of Daniels Electronics MT-3
Synthesizer modules or MT-3 Crystal Controlled
modules provide a suitable RF local oscillator
source. The local oscillator input level should
never exceed +7 dBm (5 mW into 50 Ω)
DOUBLE BALANCED MIXER
Double Balanced Mixer, M1, down converts
the received signal to 21.4 MHz. The mixer has
a maximum conversion loss of 7.5 dB and its
maximum local oscillator drive level is +7 dBm.
MT-3 Low Current Front End Instruction Manual
IM11-FE3
5
GENERAL
Alignment for the MT-3 Front End consists of
tuning the five section preselector filter only.
No tuning is required for frequency changes
within the 3 dB bandwidth of its originally tuned
frequency (5 MHz for VHF and 7 MHz for UHF);
although, without tuning at the 3 dB band edges,
the receivers sensitivity will be degraded. For
frequency changes outside of the Front End’s 3
dB bandwidth, use the tuning procedure outlined
below.
REPAIR NOTE
The MT-3 Front End employs a high percentage
of surface mount components which should
not be removed or replaced using an ordinary
soldering iron. Removal and replacement of
surface mount components should be performed
only with specifically designed surface mount
rework and repair stations complete with Electro
Static Dissipative (ESD) protection.
When removing Surface Mount Solder Jumpers,
it is recommended to use solder wick braid in
place of vacuum type desoldering tools. This will
help prevent damage to the circuit boards.
RECOMMENDED TEST
EQUIPMENT
Alignment of the MT-3 Front End requires the
following test equipment or its equivalent:
Power supply - Regulated +9.5 Vdc
Spectrum Analyzer with Tracking Generator
Alignment Tool - Johanson 8764
CHECK POINTS
Vsupply: +9.5 Vdc @ 8 mA
Preselector Filter Insertion typically VHF: 3 dB;
Loss: UHF: 4.5 dB
RF Amplifier Gain: typically VHF: 20 dB;
UHF: 16 dB
Image Rejection Filter Loss: 1.5 dB maximum
Mixer Conversion Loss: 7.5 dB maximum
Test Point #1 (TP1): +7.4 Vdc
Test Point #2 (TP2): +8.0 Vdc
Local Oscillator Frequency: RF Frequency ± 21.4
MHz
FRONT END
ALIGNMENT
MT-3 Low Current Front End Instruction Manual
IM11-FE3
Front End Alignment
6
TUNING PROCEDURE
The best way to tune the MT-3 Front End is to use a Spectrum Analyzer with a tracking generator.
The frequency response of the Preselector Filter can be seen at the IF output. Use the following
procedure for swept frequency tuning:
1) Check to see if the correct image rejection filter is selected for the frequency
of interest. This operation requires removing the Front End’s shield lid and changing
the solder jumpers if required.
2) Supply +9.5 Vdc to the MT-3 Front End (red wire).
3) Connect the Tracking Generator output with the Front End’s RF input. The tracking
generator should have an output level of -20 dBm and a frequency span of at least 10 MHz.
If the preselector filter is grossly misaligned, a larger frequency span may be required.
4) Adjust the helical filter trimmer capacitors for a flat response centered at the desired
RF frequency. The measured input level should be approximately -25 dBm and the
3 dB bandwidth should be 5 MHz and 7 MHz in the VHF and UHF range respectively.
MT-3 FRONT END REMOVAL AND INSTALLATION
The MT-3 Front End is fastened to the main board (MT-3 Receiver IF/Audio Board) with a single
Phillips screw to the Type F connector and to the front panel with two countersunk Phillips screws.
Remove these screws and disconnect the IF, LO, and power cables to remove the VHF / UHF Front
End. Installation of the MT-3 Front End is performed in a fashion reverse to the above procedure.
MT-3 Low Current Front End Instruction Manual
IM11-FE3
7
PRINTED CIRCUIT BOARD
NUMBERING CONVENTION
Daniels Electronics Ltd. has adopted a printed
circuit board (PCB) numbering convention in
which the last two digits of the circuit board
number represent the circuit board version. All
PCB’s manufactured by Daniels Electronics Ltd.
are identified by one of the following numbering
conventions:
PCB number 43-912010
Indicates circuit board version 1.0
PCB number 50002-02
Indicates circuit board version 2
(no decimal version)
ILLUSTRATIONS
AND SCHEMATICS
MT-3 Low Current Front End Instruction Manual
IM11-FE3
Illustrations and Schematics
8
VHF FRONT END COMPONENT LAYOUT
DATE: 05 MAR 03
TITLE: MT-3 RF AMP VHF LOW CURRENT RF AMP BOARD
BOARD NO: 50037-01
REV DATE: -
DWG No: 01-T-01-01
DANIELS
ELECTRONICS LTD.
TM
1
11
21
2
12
22
3
13
23
4
14
24
5
15
25
6
16
26
7
17
27
8
18
28
9
19
29
10
20
30
A
PCB 50037-01
A
TP2
JU1
A
B
JU2
A
B
TP1
VHF
UHF
LOW
HI
NOTE:
0R0 JUMPERS ARE INSTALLED FOR
COMPONENTS C12 THROUGH C15
HIGH
BAND
LOW
BAND
L2
68nH
C12
22pF
C15
22pF
C13
12pF
C14
12pF
L5
33nH
L7
33nH
L6
27nH
C16
18pF
C19
18pF
C18
39pF
C17
39pF
L8
82nH
L10
82nH
L9
100nH
C4
1.0nF
C9
68pF
C5
1.0nF
R5
221R
R6
150R
C11
18pF
R8
N/I R9
N/I
R10
0R0
R11
N/I
R12
N/I
R1
200R
M1
TUF-2SM
R7
0R0
R2
2K67
R3
Q1
BC807-25
R4
6K81
C6
C7 10nF
C10
1.0nF
10K0
100nF
Q2
NE02139
NOT INSTALLED
NOT INSTALLED
JUMPERS INSTALLED
A
L1
10.0uH
C1
4.7uF C2 C3
10nF
100nF
C8
1.0nF
A
SELECT JUMPER TABLE
VR-3/140-xxxxxxxx VR-3/160-xxxxxxxx
JU1-B
JU2-B
LOW
JU1-A
JU2-A
HI
TL1
RF INPUT
J5
LO INPUT
J4
IF OUTPUT
IF
A
MT-3 Low Current Front End Instruction Manual
IM11-FE3
Illustrations and Schematics 9
UHF FRONT END COMPONENT LAYOUT
DATE: 05 MAR 03
TITLE: MT-3 RF AMP UHF LOW CURRENT RF AMP BOARD
BOARD NO: 50037-01
REV DATE: -
DWG No: 02-T-01-01
DANIELS
ELECTRONICS LTD.
TM
1
11
21
2
12
22
3
13
23
4
14
24
5
15
25
6
16
26
7
17
27
8
18
28
9
19
29
10
20
30
A
PCB 50037-01
AA
TP2
TL1
RF INPUT
JU1
A
B
JU2
A
B
J4
IF OUTPUT
TP1
VHF
UHF
LOW
HI
NOTE:
0R0 JUMPERS ARE INSTALLED FOR
COMPONENTS C12 THROUGH C15
HIGH
BAND
LOW
BAND
L1
10.0uH
C1
4.7uF C2 C3
10nF
100nF
R2
2K67
R3
Q1
BC807-25
R4
6K81
C6
C7 10nF
C8
1.0nF
C10
1.0nF
M1
TUF-2SM
R11
N/I
R10
0R0
R7
0R0
R8
N/I R9
N/I
10K0
100nF
Q2
NE02139
R11
N/I
R8
N/I R9
N/I C12
8.2pF
C13
3.3pF
C14
3.3pF
L5
12nH
L7
12nH
L6
10nH
C16
6.8pF
C19
6.8pF
C18
12pF
C17
12pF
L8
27nH
L10
27nH
L9
33nH
C4
10nF
C9
27pF
L4
20nH
C5
10nF 20nH
L3
R5
475R
R6
178R
C11
8.2pF
C15
8.2pF
R11
N/I
R8
N/I R9
N/I
R1
200R0
HIGH
BAND
R12
N/I
R12
N/I
NOT INSTALLED
JUMPERS INSTALLED
UR-3/420-xxxxxxxx UR-3/460-xxxxxxxx
JU1-B
JU2-B
LOW
JU1-A
JU2-A
HI
SELECT JUMPER TABLE
A
TL1
RF INPUT
J5
LO INPUT
J4
IF OUTPUT
IF
A
LO
MT-3 Low Current Front End Instruction Manual
IM11-FE3
Illustrations and Schematics
10
DATE: 6 AUG 2003
TITLE: VHF / UHF Front End Tuning Diagram
DRAWN BY: S. EARTHY
REV DATE: -
DWG No: B0303
DANIELS
ELECTRONICS LTD.
TM
1
11
21
2
12
22
3
13
23
4
14
24
5
15
25
6
16
26
7
17
27
8
18
28
9
19
29
10
20
30
A
C24
C23
C22
C21
C20
RF OUTPUT
+9.5 VDC
RF AMPLIFIER PCB.
SMB CONNECTOR (RF INPUT)
TO SMB CONNECTOR
TO SMB CONNECTOR
ALIGNMENT
CAPACITORS (5)
JU1
JU2
A
AB
B
RF INPUT
VHF/UHF FRONT END SCHEMATIC DIAGRAM VHF/UHF FRONT END TUNING DIAGRAM
MT-3 Low Current Front End Instruction Manual
IM11-FE3
11
PARTS
LIST
ELECTRICAL PARTS LIST
Ref
Desig Description Part Number
C1 CAP., SM, 4.7uF TANT., 10%,16V 1055-5B475K16 • •
C2 CAP., SM,100nF CER,0805,X7R,50 1008-5A104K5R • •
C3 CAP., SM,10nF CER,0805,X7R,50V 1008-4A103K5R • •
C4 CAP., SM, 1nF CER,0805,X7R,50V 1008-3A102K5R •
CAP., SM,10nF CER,0805,X7R,50V 1008-4A103K5R •
C5 CAP., SM, 1nF CER,0805,X7R,50V 1008-3A102K5R •
CAP., SM,10nF CER,0805,X7R,50V 1008-4A103K5R •
C6 CAP., SM,100nF CER,0805,X7R,50 1008-5A104K5R • •
C7 CAP., SM,10nF CER,0805,X7R,50V 1008-4A103K5R • •
C8 CAP., SM, 1nF CER,0805,X7R,50V 1008-3A102K5R • •
C9 CAP., SM, 27pF CER., 0805, C0G 1008-1A270J1G •
CAP., SM, 68pF CER., 0805, C0G 1008-1A680J1G •
C10 CAP., SM, 1nF CER,0805,X7R,50V 1008-3A102K5R • •
C11 CAP., SM, 18pF CER., 0805, C0G 1008-1A180J1G •
CAP., SM, 8.2pF CER., 0805,C0G 1008-0A829J1G •
C12 CAP., SM, 22pF CER., 0805, C0G 1008-1A220J1G •
CAP., SM, 8.2pF CER., 0805,C0G 1008-0A829J1G •
C13 CAP., SM, 12pF CER., 0805, C0G 1008-1A120J1G •
CAP., SM, 3.3pF CER., 0805,C0G 1008-0A339J1G •
C14 CAP., SM, 12pF CER., 0805, C0G 1008-1A120J1G •
CAP., SM, 3.3pF CER., 0805,C0G 1008-0A339J1G •
C15 CAP., SM, 22pF CER., 0805, C0G 1008-1A220J1G •
CAP., SM, 8.2pF CER., 0805,C0G 1008-0A829J1G •
C16 CAP., SM, 18pF CER., 0805, C0G 1008-1A180J1G •
CAP., SM, 6.8pF CER., 0805,C0G 1008-0A689J1G •
C17 CAP., SM, 12pF CER., 0805, C0G 1008-1A120J1G •
CAP., SM, 39pF CER., 0805, C0G 1008-1A390J1G •
C18 CAP., SM, 12pF CER., 0805, C0G 1008-1A120J1G •
CAP., SM, 39pF CER., 0805, C0G 1008-1A390J1G •
C19 CAP., SM, 18pF CER., 0805, C0G 1008-1A180J1G •
CAP., SM, 6.8pF CER., 0805,C0G 1008-0A689J1G •
C20 CAP.,TRIM. .8-10pF,”D” BUSHING 1082-E0R8010B •
C21 CAP.,TRIM. .8-10pF,”D” BUSHING 1082-E0R8010B •
C22 CAP.,TRIM. .8-10pF,”D” BUSHING 1082-E0R8010B •
C23 CAP.,TRIM. .8-10pF,”D” BUSHING 1082-E0R8010B •
C24 CAP.,TRIM. .8-10pF,”D” BUSHING 1082-E0R8010B •
VHF Front End
UHF Front End
MT-3 Low Current Front End Instruction Manual
IM11-FE3
Parts List
12
L1 INDUCTOR, SM, 10.0uH, 10%,1812 1255-4G10000K • •
L2 INDUCTOR,SM,150nH CER,10%,1008 1256-2BR1500K •
L3 COIL, 2.5 TURNS,20AWG,2.54mmID 1220-2T502007 •
L4 COIL, 2.5 TURNS,20AWG,2.54mmID 1220-2T502007 •
L5 INDUCTOR, SM,12nH CER,10%,1008 1256-1B12N00K •
INDUCTOR, SM,33nH CER,10%,1008 1256-1B33N00K •
L6 INDUCTOR, SM,10nH CER,10%,1008 1256-1B10N00K •
INDUCTOR, SM,27nH CER,10%,1008 1256-1B27N00K •
L7 INDUCTOR, SM,12nH CER,10%,1008 1256-1B12N00K •
INDUCTOR, SM,33nH CER,10%,1008 1256-1B33N00K •
L8 INDUCTOR, SM,27nH CER,10%,1008 1256-1B27N00K •
INDUCTOR, SM,82nH CER,10%,1008 1256-1B82N00K •
L9 INDUCTOR, SM,33nH CER,10%,1008 1256-1B33N00K •
INDUCTOR,SM,100nH CER,10%,1008 1256-2BR1000K •
L10 INDUCTOR, SM,27nH CER,10%,1008 1256-1B27N00K •
INDUCTOR, SM,82nH CER,10%,1008 1256-1B82N00K •
L11 COIL, 8TURNS,16AWG,.50”ID,CuAg 1225-8T001630 •
L12 COIL, 2.75T,16AWG,.50”ID,Cu/Ag 1225-2T751640 •
COIL, 8TURNS,16AWG,.50”ID,CuAg 1225-8T001630 •
L13 COIL, 2.75T,16AWG,.50”ID,Cu/Ag 1225-2T751640 •
COIL, 8TURNS,16AWG,.50”ID,CuAg 1225-8T001630 •
L14 COIL, 2.75T,16AWG,.50”ID,Cu/Ag 1225-2T751640 •
COIL, 8TURNS,16AWG,.50”ID,CuAg 1225-8T001630 •
L15 COIL, 2.75T,16AWG,.50”ID,Cu/Ag 1225-2T751640 •
COIL, 8TURNS,16AWG,.50”ID,CuAg 1225-8T001630 •
L16 COIL, 2.75T,16AWG,.50”ID,Cu/Ag 1225-2T751640 •
M1 MIXER/SM, DBL. BAL.,DC-1000MHz 2605-DBS21000 • •
PCB PCB, RF AMP,F/E,LO CUR.150/400 4311-70500371 • •
Q1 TRANSISTOR, BC807-25,PNP,SOT23 2120-BC807025 • •
Q2 TRANSISTOR, NE02139,HIGH FREQ. 2124-NE021390 • •
R1 RES., SM, 200R 1206, 1%,100ppm 1150-2B2000FP •
RES., SM, 475R 1206, 1%,100ppm 1150-2B4750FP •
R2 RES., SM, 2K67 1206, 1%,100ppm 1150-3B2671FP • •
R3 RES., SM, 10K0 0805, 1%,100ppm 1150-4A1002FP • •
R4 RES., SM, 6K81 0805, 1%,100ppm 1150-3A6811FP • •
R5 RES., SM, 221R 1206, 1%,100ppm 1150-2B2210FP •
RES., SM, 475R 1206, 1%,100ppm 1150-2B4750FP •
R6 RES., SM, 150R 1206, 1%,100ppm 1150-2B1500FP •
RES., SM, 178R 1206, 1%,100ppm 1150-2B1780FP •
R7 RES., SM, ZERO OHM JUMPER,0805 1150-0A0R0000 • •
R10 RES., SM, ZERO OHM JUMPER,0805 1150-0A0R0000 • •
Ref
Desig Description Part Number
VHF Front End
UHF Front End
MT-3 Low Current Front End Instruction Manual
IM11-FE3
Parts List 13
MECHANICAL PARTS LIST
Description Part Number
BRACKET, CAP. MTG,V/UHF 5P F/E 3702-65001005 1 1
BRACKET, COIL MTG,V/UHF 5P F/E 3702-65001006 1 1
CABLE, CONFORM., 28mm/4mm/9mm 7489-C1055600 1 1
CABLE,SMB PLUG-OPEN,RG316,24CM 7910-WP004024 1 1
CABLE,SMB STR/PL-N(CSK)JK,21CM 7910-WS7NJ021 1 1
CABLE,SMA PLUG-OPEN,RG316,21CM 7910-SP001021 1 1
SHIELD, V/UHF F/END AMP - LID 3702-67301121 1 1
SHIELD, V/UHF F/END AMP - WALL 3702-67301120 1 1
CAP.,TRIM. .8-10pF,”D” BUSHING 1082-E0R8010B 5
CASE, V/UHF 5 POLE HEL. FILTER 3702-65801120 1 1
CONN., SMB, JACK,BULKHEAD,REAR 5121-J1SC01BG 1 1
CORE, COIL,V/UHF 5PL HEL FILT. 5790-B1027000 5 5
LOCK WASHER .234-64 FOR 8052/4 1083-L234T640 5 5
LOCKWASHER,M2.5,SPLIT,A2 STEEL 5814-2M5LK00S 18 18
NUT, .234-64, HEX, FOR 8052/4 1083-N234T640 5 5
SCREW, M2.5x39 CHEESE/PHIL, A2 5812-2M5PP39S 18 18
SCREW, M3 X 6, FLAT/PHIL., A2 5812-3M0FP06S 2 2
SCREW, NYLON, 6-32x3/8,RD/SLOT 5802-632RS06P 5 5
STANDOFF,5.56mmOD,4mmL,M2.5,SW 5927-5S4BM25T 6 6
WIRE, TFE/STRAND., 24AWG, RED, 20cm 7121-24S19362 1 1
VHF Front End
UHF Front End
MT-3 Low Current Front End Instruction Manual
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MT-3 Low Current Front End Instruction Manual
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15
REVISION
HISTORY
Revision Date ECO Description
1 May 97 Issue 1.
1 Rev A Apr. 98 550 BRACKET, COIL MTG, 5P F/E, AgPLT part number
was 3802-65001006 is now 3702-65001006.
Dec. 98 531 To provide more gain in the 406-430 MHz frequency band.
L11 – L15 were 1/4 turn coils now 3/4 turn coils.
Apr. 01 5053 The SMA and SMB cables are now a turnkey production.
Part numbers were $7910… are now 7910…
May 01 5061 Some mechanical changes were made to improve manufacturing.
The M3x40 pan/phil is now a M2.5 x 39 pan/phil.
The M3 lockwasher is now a M2.5 lockwasher.
The M3 press nut is now a M2.5 standoff.
Jan 02 5069 To improve manufacturing.
CABLE, COAXIAL is now bought out.
Jan 02 5077 To simplify manufacturing.
CASE, V/UHF 5 POLE HE.., FILTER was 3802-… now 3702-…
Sep 02 Add missing L.O. input cable part number.
Sep 02 727 To improve intermodulation performance - VHF band only.
R1 is now 475R (was 200R.)
L2 is now 150nH (was 68nH.)
1 Rev B Oct 02 Revision B released which includes all changes indicated above,
since release of Issue 1 Revision A (Apr. 98).
2-0-0 Oct 03 New Revision
Moved to new instruction manual format.
2-0-1 Jan 04 Added missing parts from mechanical parts list.
2-0-2 Aug 05 Added CABLE,SMA PLUG-OPEN,RG316,21CM (7910-SP001021)
missing from Mechanical parts list.
Added Lid (3702-67301121) to Mechanical parts list; part was
missing.
Updated VHF/UHF Schematic on page 10; wrong version was
displayed.
MT-3 Low Current Front End Instruction Manual
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