Dittel FSG 2T PS Operator's Manual
FSG 2T:
FCC ID: BVYFSG2T
LBA.O.10.911/103 JTSO
replaced by:
ESTO: EASA.21O.1304
FAA: TSO C37d
TSO C38d
DFS-Nr.: D - 0002/2002
FSG 2T PS
Fixed / Portable / Mobile
VHF/AM Airband Transceiver
5 Watt 118.000 136.975 MHz
Operators Manual
Before operating the Transceiver, please
read this manual thoroughly!
Please observe the Safety Information!
Keep for further use!
Date of Issue May 2010
Revision 04
Document no.: OM 145.2T-EN Article no.: D10077
Owners Name:
Serial No. 2T PS:
Dittel Messtechnik GmbH
Avionics Division
Erpftinger Straße 36 86899 Landsberg Germany
Telephone +49 (0)8191 / 3351-0 Fax +49 (0)8191 / 3351-49
e-mail: Info@dittel.com Internet: www.dittel.com
Dittel Messtechnik GmbH is certified to DIN EN ISO 9001:2000 and DIN EN ISO 14001:2005. It is an accredited manufacturer of
aeronautical equipment DE.21G.0100, maintenance facility DE.145.0245, and development facility ETSO-2C37e/ETSO-2C38e.
FSG 2T PS
Portable VHF/AM Airband Transceiver
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DITTEL D10077 May 2010
Manual Revision History
MANUAL OM 145.2T-EN
REVISION 04
This list gives you a RECORD OF REVISIONS of the
«Operators Manual»
due to
new hardware, mistakes or errors.
Revision DESCRIPTION/REASON FOR CHANGE Date
- NEW March 2003
01 New version of documen t Declaratio n of Conform ity appropriate to
the Germa n law (FTEG) of radio an d telecom te rminal equip ment. 12/05/03
02 FAA TSO numbers added at front page 17/09/03
03 Section 6, option cha nnel only mode added May 2005
04
Companys name changed into Dittel Messtechnik GmbH;
Extension of EC-Type Approval (Kraftfahrt-Bundesamt); new ESTO
document; 2-pole DC connector changed into 3-pole DC connector
due to ceased production, resulting in some new article numbers
May 2010
FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL D10077
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Table of Contents
Manual Revision History....................................................................2
Table of Contents...............................................................................3
Abbreviations.....................................................................................5
1 For Your Safety........................................................................7
1.1 Used Symbols....................................................................................9
2 General Description ..............................................................11
2.1 About this document.........................................................................11
2.2 Application & Description of the FSG 2T PS.................................... 11
2.3 Equipment required but not supplied................................................12
2.4 System and Type Approval Information ...........................................12
2.5 Re-calibration Information ................................................................13
2.6 Operating License............................................................................ 13
2.7 Optional Accessories and Spare Parts.............................................14
3 Functional Description..........................................................15
3.1 Introduction....................................................................................... 15
3.2 Operator's Controls and Indicators................................................... 15
3.3 Frequency Display............................................................................ 20
3.4 Error Codes ......................................................................................21
4 Operation................................................................................23
4.1 Introduction....................................................................................... 23
4.2 Battery Check................................................................................... 23
4.3 Battery Charging...............................................................................25
4.4 Antenna - Antenna jack SO 239....................................................... 26
4.5 Microphone Socket........................................................................... 26
4.6 Turning ON - Selecting Frequency - Audio Volume..........................27
4.7 Receive (Listen) Operation............................................................... 29
4.8 Transmit (Talk) Operation.................................................................30
4.9 Memory Programming...................................................................... 32
4.9.1 Programming while in the DIRECT TUNE MODE:........................... 32
4.9.2 Programming while in the CHANNEL MODE:.................................. 33
4.10 Lighting the Frequency Display and Front Panel.............................. 34
4.11 Turning OFF the radio...................................................................... 34
4.12 External Power Supply..................................................................... 34
4.13 Removing & Installing the Transceiver............................................. 34
4.14 Battery Operating Times................................................................... 35
4.15 Emergency Operation....................................................................... 35
4.16 Siting................................................................................................. 36
4.17 Base Operation................................................................................. 36
4.18 Troubleshooting................................................................................ 36
FSG 2T PS
Portable VHF/AM Airband Transceiver
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DITTEL D10077 May 2010
Table of Contents
5 Technical Data FSG 2T PS ................................................... 39
5.1 General .............................................................................................39
5.2 Dimensions, Weight ..........................................................................39
5.3 Power Supply, Fuses ........................................................................39
5.4 Detailed Receiver Specification.........................................................40
5.5 Detailed Transmitter Specification.....................................................41
5.6 Environmental Performance Classification........................................42
6 Option "Channel ONLY Mode" ............................................ 45
6.1 Activating the option "Channel only Mode".......................................45
Appendix, Certificates..................................................................... 47
Copyright Service Information .................................................... 55
FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL D10077
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Abbreviations
Ohm
°C Degrees Centigrade
°F Degrees Fahrenheit
A/C
Aircraft
A/N Article Number
(Dittel Messtechnik
GmbH)
AGC Automatic Gain Control
Ah Ampere hour
AM Amplitude Modulation
ANT Antenna
Ass'y Assembly
AWG American Wire Gauge
ccw
Counter-clockwise (turn left )
CH Channel
cw
Clockwise (turn right )
dB Decibel
dia. Diameter
EMF Electromotive Force (voltage of
an open circuit)
F/CH Frequency/Channel
FL Flight Level
g Acceleration due to gravity
GND Ground
HI High Power
Hz Hertz
ICAO
International Civil Aviation
Organization
IF Intermediate Frequency
kHz Kilohertz
LCD Liquid Crystal Display
LED Light Emitting Diode
LO Low Power
LOS Line-Of-Sight
m Modulation
mA
Milliampere
MD Mode
MHz Megahertz
MIC Microphone
mW Milliwatt
NM Nautical miles (1.852 km)
nW Nanowatt (10-9)
PEP Peak Envelope Power
PLL Phase-Locked Loop
ppm Parts per million
PTT Push-To-Talk
pW Picowatt (10
-12
)
RF Radio Frequency
rms
Effective value
(root mean square)
RX Receive
S+N/N Signal-to-Noise Ratio
SINAD
Ratio:
Signal noise distortion
noise distortion
SPKR Loudspeaker
SQ Squelch
STBY Standby
STO Store
SWR Standing-Wave Ratio
THD Total Harmonic Distortion
TOT Time out timer
TX Transmit
VA Volt-ampere, apparent power
Vac Volts, alternating current
VCO Voltage-Controlled Oscillator
Vdc Volts, direct current
VFO Variable-frequency oscillator
VHF Very-High Frequency
VOL Volume
VSWR Voltage Standing-Wave Ratio
W Watt, real power
FSG 2T PS
Portable VHF/AM Airband Transceiver
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DITTEL D10077 May 2010
Notes:
FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL D10077
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1 For Your Safety
Every radio, when transmitting, radiates energy into the atmosphere
that may, under certain conditions, cause the generation of sparks. All
users of our portable radios should be aware of the following warning:
Do not operate this portable radio in an explosive atmosphere
(petroleum fuels, solvents, dust, etc.)!
During normal use, the radio will subject you to radio frequency
energy substantially below the level where any kind of harm is
reported.
There are no user replaceable parts inside the FSG 2T PS! If the
radio fails it must be returned to a Dittel Messtechnik GmbH
approved repair facility!
The licensee of a radio station is responsible at all times for the
proper operation of the station. Radio operators should use the
following guidelines to make this radio a useful tool for safe and
efficient communication:
DO NOT transmit when the antenna is very close to, or touching,
exposed parts of the body, especially the face and eyes. Persons
with pacemakers should be aware that proper functioning may be
affected when in the vicinity of the antenna!
DO NOT transmit without antenna connected.
DO NOT operate the radio on an unprotected power supply.
Replace a blown fuse only against correct type with specified
nominal value. Investigate the cause.
DO NOT transmit on a busy channel.
DO NOT press the transmit (PTT) key when not actually desiring
to transmit.
DO NOT transmit with the antenna inside aircraft or vehicle. This
may cause malfunction of onboard avionics, trigger the vehicle
airbag or interfere onboard instruments! Always operate the
portable radio FSG 2T PS with a suitable outdoor / external
antenna! Assure appropriate lightning protection / grounding where
(elevated) outdoor antennas are used.
DO NOT operate the radio whilst driving. It should also be noticed
that even the use of a hand held microphone while driving could
constitute an offence under the Road Traffic Regulations in certain
countries.
DO NOT allow children to play with any radio equipment
containing a transmitter.
DO NOT use a radio FSG 2T for airborne operation which is
marked as Chann. ONLY Mode:
FSG 2T PS
Portable VHF/AM Airband Transceiver
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DITTEL D10077 May 2010
Such a radio is allowed only for the use as ground station!
Always turn OFF the radio when installing or removing the unit!
Always turn OFF the radio when starting nearby engines or
vehicles!
The FSG 2T PS should be used exclusively for aviation related
communication purposes.
Unauthorized modifications and changes of the system are
forbidden.
Sufficient speech volume is very important. While the lips are very
close and facing the microphone, speak loud and clear. Proper
speech level is indicated by the yellow flickering LED on the
FSG 2T front panel.
In vehicles a suitable noise canceling microphone or headset shall
be used.
Prior to any use verify proper FSG 2T PS functions by means of a
short radio check. It has however to be taken into account that with
a faulty antenna or its cable this communication test may
absolutely turn out positive at the airfield or in short distance to the
ground station. But at a distance of 2 to 6 miles, a faulty antenna
and / or cables will cause communication breakdown!
Push-to-Talk keys may stick occasionally.
The transmission signaling RED or flickering YELLOW LED shall
be turn to CLEAR or GREEN when releasing the PTT key.
However, after more than two minutes continuous transmitting (by
stuck button or operator caused), the built-in transmit time-outtimer disables the transmitter in order to avoid continuous channel
blocking. A continuously flashing display warns the user. Refer to
appropriate hints in this manual.
PB
The portable airband transceiver FSG 2T PS contains a sealed
lead-acid battery (identification "Pb").
In most countries it is illegal to discard a lead-acid battery except
by delivery to a retailer, a distributor, a manufacturer, or a
collection, recycling, or smelting facility approved by the
department.
NEVER dispose worn out lead-acid batteries with the household
garbage.
FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL D10077
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1.1 Used Symbols
In this manual the following symbols are used:
WARNING!
describes an immediate threatening danger! Failing to observe the
note may cause death or heaviest injuries.
CAUTION!
describes a special note for operation. Failing to observe the note
may cause damage of the transceiver and / or stored data may be
deleted!
IMPORTANT!
describes explanations and other useful hints. Failing to observe the
note may cause degraded performance and / or unsatisfying
operation!
FSG 2T PS
Portable VHF/AM Airband Transceiver
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DITTEL D10077 May 2010
FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL D10077
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2 General Description
2.1 About this document
This operator's manual contains operating instructions for the fixed/
portable/ mobile VHF/AM Airband Transceiver FSG 2T PS of Dittel
Messtechnik GmbH, 86899 Landsberg, Germany.
2.2 Application & Description of the FSG 2T PS
The portable battery powered VHF/AM Airband Transceiver
FSG 2T PS allows independent operation as an airborne or ground
radio. Stationary, portable or mobile applications are possible. It
consists of a portable case PS (A/N F10386) and a VHF/AM COM
Transceiver FSG 2T (A/N F10350), which can be simply inserted and
positioned.
This radio is working within the airband frequency range of 118.000
MHz to 136.975 MHz in 25 kHz increments (760 channels). The
operating mode is Simplex, i.e. transmitting or receiving only in turns
(two way communication).
The built-in rechargeable battery allows an independent operation of
up to 130 hours (refer to paragraph 4.14, Battery Operating Times).
Continuous operation is possible by supplying the radio externally,
from a vehicle or aircraft DC supply. Microphone and antenna are
plugged via twist locked and screwed cap connectors. External
antennas, too, can be advantageously used.
For airborne and ground application two display modes are user
selectable:
FREQUENCY MODE:
Active Frequency and actual supply voltage are shown at the
display. Turning / pushing the F/CH knob changes frequency.
CHANNEL MODE:
Active Channel Number (1 20) and associated Frequency are
shown at the display. Turning the F/CH knob changes preset Channel
Number and associated Frequency. Reprogramming without
restriction.
Only for ground based
operation (CH ONLY Mode):
Optionally a particular mode can be set where the operation is limited
to use only preset channels. To set this mode the radio has to be
opened. This may only be performed by an approved repair
facility!
The unit features 20 non-volatile channel memories, 2 display modes,
Sidetone via headphone, three color status LED, supply voltage
indication at the back-lit display, TX time-out timer (2 minutes), a
battery supply test, DIN connectors to plug dynamic, non-amplified
FSG 2T PS
Portable VHF/AM Airband Transceiver
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DITTEL D10077 May 2010
microphones and external power supply, and a built-in loudspeaker.
The lock-in type carrying handle completes our robust FSG 2T PS
unit.
2.3 Equipment required but not supplied
Vertically polarized VHF airband antenna, frequency range
minimum 118 to 137 MHz, 50 Ohm, e.g., DITTEL spring steel band
antenna, A/N F10345.
Dynamic Microphone 30 to 600 Ohm, e.g., WD handheld dynamic
microphone with PTT-key, 5-pole DIN plug and coiled cord, A/N
F10346.
Automatic Battery Charger, e.g. DITTEL DL-50A, 115 Vac /
230 Vac, output 13.8 Vdc / 600 mA, A/N F10385.
When operating the unit on a 24 Vdc source a suitable 14
Vdc/12 Vdc Converter of at least 3 Amps must be used!
2.4 System and Type Approval Information
The VHF/AM Airband Transceiver FSG 2T complies with ICAO 25 kHz
channel spacing and also meets applicable National and International
Type Approval requirements, for any airborne and ground operation:
JTSO Authorization LBA.O.10.911/103 JTSO (LBA Luftfahrt-
Bundesamt), replaced by ETSO Authorization EASA.21O.1304
(2009), is based on EUROCAE ED-23B Airborne requirement (25
kHz ONLY CH spacing).
FM Immunity requirements according to ICAO ANNEX 10 against
FM Broadcast RF Interference.
Audio filtering required in areas with CLIMAX operation in 25 kHz
channel spacing.
Associated EUROCAE ED-14D / RTCA DO-160D Environmental
requirements for Fixed Wing and Helicopter aircraft.
Associated EUROCAE ED-12B Software requirements based on
ED-12B, Level C.
Type Approval requirements for ground operation, meeting ETSI
EN 300 676.
CE Conformity requirements for ground operation, meeting ETSI
EN 301 489-1 and -22.
DFS (Deutsche Flugsicherung) No. D - 0002/2002 German
(ground) Type Approval.
DIN / ISO 7637-1 Dc supply in 12 Vdc vehicle,
KBA No.: e1 03 2777.
FCC Compliance with Part 15 (receiver) and Part 87 (transmitter),
FCC ID: BVYFSG2T.
FAA / TSO Authorization
FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL D10077
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2.5 Re-calibration Information
IMPORTANT!
For the first time after three years, FSG 2T equipment for
ground applications requires checking and re-calibration of
the high precision reference frequency (tolerance better than
±10 ppm).
For airborne applications, no frequency re-calibration is
necessary, since applications in the 25 kHz channel spacing
require a frequency accuracy tolerance of less than ± 20 ppm.
All tolerances include the full operating temperature range of
-20°C ... +55°C / -4°F ... +131°F.
Checking and re-calibration must be performed by the
equipment manufacturer or through authorized and approved
avionics services!
2.6 Operating License
IMPORTANT!
Depending on national regulations, VHF/AM ground and / or
VHF/AM airborne operation may require an individual national
operating license. Such license is usually granted by the
responsible National Telecommunications Authority, through
suitable application forms.
Aircraft registration, operator's name, address and operating
license payment details, radio type / model, Serial number,
ESTO number EASA.21O.1304, and DFS number D-0002/2002,
or, when applicable, the FCC ID number BVYFSG2T.
Example:
FSG 2T PS
Portable VHF/AM Airband Transceiver
14
DITTEL D10077 May 2010
2.7 Optional Accessories and Spare Parts
A/N Description
F10385
DL-50A, automatic lead-acid battery charger, input: 115 Vac/230 Vac,
output: 13.8 Vdc/600 mA, cable and 3-pole DIN plug
F10345 Spring steel band antenna 118 - 137 MHz, swivel type, UHF-
connector PL-259
W00043 Magnet mount vehicle rod antenna 118 - 137 MHz, incl. 4 m/13 ft
cable, and UHF connector PL-259
W00114 Mobile Whip Antenna with shock spring, 118 - 137 MHz, incl. 5 m/
16.5 ft cable, w/out UHF connector PL-259
F10314
Balloon antenna BFA 1, 118 - 137 MHz, weatherproof - flexible - high
efficiency, including 3 m/10 ft cable and UHF connector PL-259
F10346 Dynamic hand-held microphone incl. PTT-switch, coiled cord and
5-pole plug
F10042 Dyn. hand-microphone/loudspeaker with PTT-switch, coiled cord and
5-pole DIN plug
F10125 Inline PTT-switch (U-94 A/U), coiled cord, 5-pole DIN plug, to connect
headset W00048, clip allows attaching to clothing
W00048 Dynamic headset with PJ-plug, fits inline PTT-switch
F10393 Car Cable, coiled cord, incl. 3-pole DIN plug to supply station from
12 Vdc car battery (fits cigarette lighter socket, minus = ground)
S20000 Converter 24 Vdc to 12 Vdc, 4 Amps, to operate the base Station
from 24 Vdc sources like truck batteries etc.
E61933 3-pole twist-lock DIN Connector, to fit into 12 Vdc socket of carrying
case PS.
E08834 5-pole twist-lock DIN Connector, to fit into MIC socket of carrying
case PS.
E61181 Valve-regulated lead acid battery, 12 Vdc, rated capacity 7.2 Ah
FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL D10077
15
3 Functional Description
3.1 Introduction
This section includes a functional description of each switch, push
button, knob, socket, indicator and display located on the front of the
FSG 2T PS,
together with operating instructions.
3.2 Operator's Controls and Indicators
A front view of the FSG 2T PS is given on the last page of this manual.
Please fold out the back flap when reading the operating instructions.
Each position number of a control, knob, switch, etc., corresponds to
the number of control, knob, switch, etc., given below.
Control Description / Function
1
VOL
Rotary switch and control (inner knob)
To turn ON the radio, rotate the VOL knob clockwise from the OFF
position (dot). When power is activated
the front panel TX/RX LED lights up green momentarily, then
all segments of the display are visible for a short time, to verify
their operation.
The display shows the firmware version and then
the operating mode, which was used before last turning OFF or
Power OFF: The radio is now ready for use.
Rotating the VOL knob clockwise (cw) increases - turning counter-
clockwise (ccw) decreases the audio volume audible via the built-
in loudspeaker or a connected headphone.
To turn OFF the radio rotate the VOL knob fully counter-clockwise
(ccw) to the OFF position (dot ). Blank display.
2
SQ
(SQUELCH)
Rotary control (outer ring)
After turning ON the radio FSG 2T the automatic squelch is active
depending on the SQ knob position.
Standard Operating Mode:
Set the SQ
knob to the dot position, the Squelch (mute)
threshold is approximately 1 µV. No Receiver noise should be
audible during Standby. Only received signals above the SQ
threshold are audible.
Rotating the SQ knob fully counter-clockwise (ccw) puts the radio
into the SQ-OFF mode (overrides the automatic squelch). Basic
receiving noise is then audible during Standby. This adjustment
gives maximum receiving range. Slightly increased current
FSG 2T PS
Portable VHF/AM Airband Transceiver
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DITTEL D10077 May 2010
consumption.
Rotating the SQ knob clockwise (cw) achieves Receiver muting.
To eliminate ignition noise or RF interference adjust the SQ knob
up to the full clockwise (cw) position. This gradually increases the
required RF signal to exceed the SQ threshold (max. threshold
5 µV / -93 dBm).
3
STO (STORE) Push button
When pressing the STO button (within approx. one minute)
storing of a frequency in one of the memory channels is initiated,
or
storing of a frequency is confirmed (at least 1 sec).
20 frequencies may be programmed in non-volatile memory
channels. The channel memory numbers (1 20) are user
programmable.
If the FSG 2T is set to CH ONLY Mode this STO button is without
function!
4
TX/RX LED
The TX/RX 3-color Status LED on the front panel indicates the
following:
CLEAR...................indicates a Standby condition or radio is OFF.
STEADY RED ..........indicates a Transmit condition without or too low
modulation.
FLICKERING
YELLOW.................indicates a Transmit condition with proper
microphone signal / modulation.
STEADY
YELLOW.................indicates a Transmit condition with too much
modulation or background noise (microphone
sensitivity too high)
STEADY GREEN......indicates a Receive condition; Squelch is open
automatically (or set OFF manually).
5
F/CH Button Push button
When pressing the F/CH button
while in DIRECT TUNE MODE (MHz or kHz is underscored), this will
change the radio into CHANNEL MODE, or
while in CHANNEL MODE (Channel number is underscored), this will
change the radio into DIRECT TUNE MODE.
The last used frequency in each mode remains. This allows toggling
between two operational frequencies by just pressing the F/CH button.
If the FSG 2T is set to CH ONLY Mode pressing the F/CH button will
show the DC supply voltage for 5 seconds (instead of continuous
channel number).
FSG 2T PS
Portable VHF/AM Airband Transceiver
May 2010 DITTEL D10077
17
6
F/CH
Knob
Rotary control and push button = dual function
Pressing the F/CH knob once
while in the DIRECT TUNE MODE changes the access from kHz to
MHz or vice versa from MHz to kHz. The active access to MHz or
kHz is underscored by a cursor.
While in the CHANNEL MODE or CH ONLY pressing the F/CH knob is
without function.
Rotating the F/CH knob
while in the DIRECT TUNE MODE will increment or decrement the
MHz or kHz portion of the active frequency with rollover at each
band edge.
while in the CHANNEL MODE changes the channel memory number
and associated frequency. All channel numbers (1 to 20) can be
used.
If the FSG 2T is set to CH ONLY Mode rotating the F/CH knob changes
the channel memory number and associated frequency. All 20
channel numbers are adjustable.
IMPORTANT!
Only ONE control element may be operated at a time. If more
than one element is operated simultaneously, function change
is blocked.
7
Frequency Display
DIRECT TUNE
MODE
CHANNEL MODE
or CH ONLY
Frequency Display, the 5-digit Liquid Crystal Display (LCD) can be
back-lit.
Frequency display complies with ICAO rules.
Initial boot at Switch-ON / Power ON
Displays all segments for 2 seconds
Clear Display for 0.5 seconds
Shows Firmware Version for 0.5 seconds
Goes to last user setting (operating mode and frequency, refer to
paragraph 3.3).
8
Fixing Screws
Two cross recessed screws, M 4 8, to fix the transceiver in the
case.
9
Loudspeaker 8 Ohm, 3 Watt, tropics-proof.
To make received signals audible; volume adjustable with VOL control
1
. It is not switched OFF when using a headset connected to 13.
FSG 2T PS
Portable VHF/AM Airband Transceiver
18
DITTEL D10077 May 2010
DANGER!
NEVER TRANSMIT inside airplanes, vehicles or
buildings without external antenna! Otherwise
electronic equipment can be interfered.
10
Antenna Socket
CAUTION!
NEVER operate the radio without any antenna!
UHF type antenna socket SO 239, 50 .
Any 50 Ohms antenna with UHF type cable plug PL-259 and a
frequency range of 118 137 MHz minimum may be connected to
this antenna jack.
For portable use in the open field we recommend our spring steel
band antenna.
In aircraft or ground vehicles, an external antenna must always be
used.
For long range operation a base station folded top antenna, grounded
for lightning protection, is recommended.
11
DC Supply
Indicator
LED indicator to check the capacity of the built-in battery or external
DC supply.
When the red push-button is pressed
at least 3 LEDs should light up to indicate sufficient capacity of the
battery or DC supply.
and only two or less LEDs light up either the battery should be
recharged or the station should be powered by an external DC
source of sufficient capacity (e.g. vehicle battery).
the display 7 and the front panel of the transceiver is back-lit.
12
CAUTION!
Always turn OFF the radio and disconnect battery
charger when replacing fuses!
DC Fuse
Fuse to protect the transceiver in case of heavy current.
Contains 1 glass cartridge fuse, 5 20 mm,
6.3 Amps, quick acting.
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