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← Racal Module Cougar FILL PRM-4515 → MA-4083 →
The unit is housed in a ruggedized die-cast aluminium enclosure with a
grip at the front. On top of the device is a tilted surface that holds the
16-character alphanumerical LED display and a keypad with 24 rubber
buttons. The unit is powered by a
removable rechargeable battery
that is installed in a slot behind the display.
The MA-4073 is connected to a compatible radio by means of a so-called
fill cable
that is attached to the
7-pin 105 socket
to the left of the battery. Note that differently wired fill cables are
required for different types of radios and standards.
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Radio frequencies (channels) and cryptographic keys can be stored in
the internal CMOS memory of the MA-4073 for as long as the battery charge lasts.
In case of an emergency, the stored information can be purged instantly
by turning the ZEROIZE button
to the right of the battery. 1
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Different versions of the MA-4073 exist, each of which is identified
by a single letter suffix to the model number, for example: MA-4073C.
Note that different versions have to be used for different encryption modules.
Using the 'wrong' version, allows the frequencies
to be programmed, but not the cryptographic keys.
Always check the documentation of the radio before trying to load the keys.
In most cases, a single letter suffix to the radio model tells you which
programmer to use.
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- MA-4073C
This version should be used with radios or encryption units that have
a part number with the suffix 'S'. Such radios are typically equipped with a
green MA-4437 crypto module.
- MA-4073G
This version should be used with radios or encryption units that have
a part number with the suffix 'U', for example PRM-4515H3TCU.
Such radios are typically equipped with a
red MA-4487 crypto module.
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The image on the right shows the military variant of the MA-4073C,
which is housed in a green die-cast metal enclosure. It requires a
special battery that is installed behind the display.
To the left of the battery cradle is a 7-pin radio socket and the fuse.
To the right of the battery is a switch that can be
used for ZEROIZING the device in case of an emergency.
This is done by pushing the knob in and turning it clockwise.
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The image on the right shows the civil law-enforcement version of the MA-4073G.
It is housed in a black die-cast metal enclosure and accepts a standard
MA-4516 battery (the same one as used with the MA-1515 handheld radio).
Note that the layout of this variant is slightly different from the one
shown above. Apart from accepting a regular MA-4515-compatible battery,
the 7-pin radio socket is located at the right.
Furthermore, this variant does not have
an emergency ZEROIZE facility.
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The MA-4073 can store the following data in its internal memory:
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- 30 Transmit frequencies
- 30 Receive frequencies
- 4 Cryptographic keys
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The transmit and receive frequencies can all be in the range
0 - 999.999 MHz, but the actual frequencies that are stored
must be suitable for the radio to which they are uploaded:
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- PRM-4515L, SRM-4523L
VHF-L band transceiver, 68-88 MHz, 10 channels.
- PRM-4515N, SRM-4523N
VHF-L band transceiver, 68-88 MHz, 10 channels.
The Tone ON/OFF is not available with this radio.
- PRM-4515H, SRM-4523H
VHF-H band transceiver, 132-174 MHz, 10 channels.
Individual radios operate in a 20 MHz band segment.
- PRM-4515U, SRM-4523U
UHF band transceiver, 380-470 MHz, 10 channels.
Individual radios operate in a 20 MHz band segment.
- PRM-4735L
Covert VHF-L band transceiver, 76-86 MHz, 8 channels.
- PRM-4735HA
Covert VHF-H band transceiver, 138-156 MHz, 8 channels.
- PRM-4735HB
Covert VHF-H band transceiver, 156-174 MHz, 8 channels.
- BCC-584D
30 channels.
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The 4 cryptographic keys, or key variables, or keys, each consist of
36 digits in the range 0-7. The keys can be entered manually or
can be generated randomly by the MA-4073C.
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Most of the devices listed above can also be programmed by means of
the much smaller MA-4083 fill gun.
Apart from a single ZEROIZE button,
this unit has no controls and needs to be filled before use by the
MA-4073.
Once filled, it can be used to transfer the data
to other radios.
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Note that the MA-4083 fill gun
can only be used to transfer channel frequency
data or crypto keys, but not both at the same time.
Note also that, for transferring crypto keys, the suffix of the
fill gun's model number has to match the suffix of the
model number of the programmer (e.g. use MA-4073C to fill an MA-4083C).
Channel frequencies can be transferred with any model.
➤ MA-4083 Fill Gun
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© Crypto Museum. Created: Sunday 17 May 2015. Last changed: Saturday, 18 May 2019 - 07:21 CET.
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