RF LIMITED

MAGNUM
DELTAFORCE
OMEGAFORCE

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MAGNUM
DELTAFORCE
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DeltaForce_banner

The MAGNUM DELTAFORCE 10 Meter Mobile Multimode 
Transceiver was made by a division of RF LIMITED 
(MAGNUM INTERNATIONAL) in the Philippines.


The DELTAFORCE was first seen by Cobraworxshopz around 1998. 
Various computer "CGi" graffic style adverts were marketed by RF LIMITED. 
An example of one advert from back then is shown below.


DeltaForce_advert



From the CGi adverts the DELTAFORCE looks very impressive, the retro-classic Cobra 148 chrome-look, coupled with the Ranger RCI-2950DX style back-lit 
LCD display is very asthetically pleasing.  

 
After learning of the intended specification, Cobraworxshopz Technicians eagerly awaited the delivery of a brand NEW RF LIMITED 
MAGNUM DELTAFORCE.

DeltaForce_Box

The DELTAFORCE box design graffics were different for the UK/European and the USA versions, as seen below. The UK version (on top) showed a World map in the background and the USA version showed a Big Rig Truck and Trailer.

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Rear view of both DELTAFORCE box versions below.
UK / Europe then USA versions.

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Side views below.

Magnum_Deltaforce_boxes_side

















Straight out-of-the-box the DELTAFORCE looked as good as the computer generated versions had suggested, interestingly the box displayed 
the same CGi picture.

Magnum Deltaforce Operating Manual, below.

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FIRST IMPRESSIONS
 
DeltaForce_Front_top


At first glance the DELTAFORCE chrome bezel has the centre "step" similar to the Connex
4800 DXL-E. The S/RF meter and LCD back-lights 
also illuminate the rotary controls, which is useful but not by design. 
A 5-digit LCD display, with frequency counter (indicator - not VCO locked) and capable of displaying, bands, modes (AM,FM,SSB etc), Modulation meter 
(bar-graph style) and various other functions. 
The DELTAFORCE specification is impressive, Transmit TX audio is truly superb on all modes, using the stock MAGNUM microphone. 
The supplied microphone is an electret-condenser style power mic with frequency up/down buttons to control the Transceivers frequency and scanning function.
The on-board Digital
Echo chamber is also of excellent audio quality, with fully adjustable echo volume and delay speed, lush reverb to several seconds delay, virtually on par with the Astatic EchoMax and MobileMax units. 

 
DeltaForce_right_front

The DELTAFORCE front panel has some interesting features, 
Superstar
SS-3900 style chrome knobs and six momentary push-buttons that have a variety of functions, each displayed on the large LCD.

DELTAFORCE 

Features and functions at a glance:

Microprocessor Controlled - PLL & LCD
Power On/Off Switch
Volume Control
Squelch Control
Mic Gain Control
RF Gain Control
RX Clarifier (R.I.T) Control
Roger Bleep Switch (1Khz Tone)
S/RF - CAL - SWR Switch
PA Switch (Public Address)
Variable RF Power Control
SWR Calibrate Control
TURBO Digital Echo On/Off Control
TURBO Digital Echo Volume Control
TURBO Digital Echo Delay Control (Lush Reverb - Several Seconds)
AMT (All-Mode Variable TalkBack to monitor TX audio)
TX Modulation Meter on LCD (Bar graph style)
Channel Selector 40-Position Rotary Control (small type)
Function Switches ( x 6 momentary style)
Frequency Resoloution "Step" Function (1Khz, 10Khz, 100Khz)
NB Function (Noise Blanker)
Call Channel Function (28.400Mhz)
LCD & S/RF Backlight Dimmer Function
5 x Memory Channels (Stores Frequency And MODE !!)
LCR Function (Last Channel Recall)
Scan Function +/- (Frequency or Memory Scanning)
Shift Function (Repeater Offset Frequency 100Khz)
RPT Function (Repeater Offset Direction + or -)
Mode Function (AM,FM,USB,LSB)
M.Load Function (Memory Load or Recall)
M.Save Function (Memory Save)
Programming Tone (Beeps when CPU is Programmed)
Frequency Coverage 25.615Mhz - 29.655Mhz
Bands "D-L" on the
14-Band chart
Dual-RF-Outputs 
15 Watts Carrier 30 Watts SSB PEP
Left hand side mounted 6-pin Mic socket 
SO-239 Aerial Socket
Extension Speaker Socket 3.5mm Jack
PA Socket 3.5mm Jack
Wired 2-Pin DC Power Cable Flying Lead.


INSIDE


 Inside the DELTAFORCE reveals a large printed circuit board mounted on the  side of the chassis used for the TURBO Digital Echo and TalkBack components.
Apart from the Digital Echo wiring loom the DELTAFORCE is very tidy inside with plug and socket style connectors mounted on the chassis. All the controls are the NEW style small "square" rotary type, the channel selector is seen top right of the picture below and is about a quarter of the size of the original 148 selector.



DeltaForce_Chassis_from_rear



On closer inspection the DELTAFORCE is based around the 
Uniden
PB-010AB chassis. Using a CPU / Microprocessor "LC72322N" IC501  (CPU) mounted behind the LCD instead of the usual Phase Locked Loop IC (PLL) and Adders for all the frequency, LCD display and associated transceiver functions. Crystal filter installed is a 10M4DR and the AM regulator is upgraded 
along with Dual-RF output transistors.


DeltaForce_inside


The original / early revisions of the DELTAFORCE were furnished with Mitsubishi RF output devices. The RF Driver is a 2SC2166 and the Dual-RF output Transistors are 2SC1969's. Also seen is the RF Pre-Driver Transistor (below left) which has a copper heatsink for additional cooling. The Bias-Shorting Plate is soldered into place via the three test points.

Magnum_Deltaforce_RF_Transistors




















The print side of the DELTAFORCE Chassis is pictured below.
Notice the three RFi screen shields, also three black coloured square shaped Chassis reinforcement foam pads, used to stop the pcb flexing while in transit.  

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Shown below is the DELTAFORCE solder/print side of the Chassis, 
with inter-connecting wiring looms for the CPU/LCD display and all controls.

Magnum_Deltaforce_print_side_pcb




























The front panel CPU/LCD pcb is pictured below. The CPU is just left of center (highlighted red) and the Channel Selector control, soldered to it's connection pcb is seen bottom left. Many of the wired connections on the CPU/LCD pcb are directly soldered, making servicing and replacing the pcb a time consuming task.

Magnum_Deltaforce_print_CPU_LCD_front_view






















CPU
LC72322N

The Magnum DELTAFORCE CPU is a Sanyo Semicon Device "LC72322N"
The LC72322N is a single chip
Microcontroller, designed for electronic tuning in
radio transceivers and include an on-chip LCD driver circuit
and a PLL circuit that operates at 150 MHz. 
The microcontroller feature a large program ROM capacity,
an efficient instruction set, and powerful hardware. 
Note: that the LC72321N, LC72322N, and LC72323N provide
functions equivalent to the LC72321, LC72322, and
LC72323, and are software compatible with those products.

Magnum_Deltaforce_CPU























CPU Functions

• Serial I/O (LC72321N only)
• Timers: 80 ės, 1 ms, 2 ms, and 5 ms periods
• Stack levels: 8 levels
• Beep tone outputs:
Six frequencies (2.08, 2.25, 2.5, 3.0, 3.75, and 4.17 kHz)
(LC72321N only)
• High-speed programmable divider
• General-Purpose counters
HCTR: Frequency measurement
LCTR: Frequency or period measurement
• LCD drive circuit: Drives 56 segments with 1/2-duty
1/2-bias drive
• Program memory (ROM):
16 bits ī 4095 words (8K bytes) LC72321N and
LC72322N
16 bits ī 3071 words (6K bytes) LC72323N
• Data memory (RAM): 4 bits ī 256 words
• All instructions are single-word instructions.
• Cycle times: 2.67 ės, 13.33 ės, or 40.00 ės (option)
• Unlock flip-flop: 0.55 ės and 1.1 ės detection
• Timer flip-flop: 1 ms, 5 ms, 25, ms, and 125 ms
• Input ports*: One dedicated key input port, and one
high-voltage port
• Output ports*:
Two dedicated key output ports, one high-voltage opendrain
port
Two CMOS output ports (one of which can be switched
over to function as an LCD driver output)
Seven CMOS output ports (Switching these ports over
to function as LCD driver outputs is supported as an
option.)
• I/O ports*:
One port switchable between input and output in 4-bit units
One port switchable between input and output in 1-bit units
• Function that detects uncontrolled looping and jumps to
a specified address
• Voltage detection reset circuit
• One 6-bit A/D converter
• Two 8-bit A/D converters (PWM) (LC72321N and
LC72322N only)
• One external interrupt (The external interrupt can be
selected to be one of the following: an external interrupt,
an internal timer interrupt, or the serial I/O circuit (in the
LC72321N).)
• RAM data retention in hold mode
• Sensing flip-flop for hot/cold start discrimination
• PLL: 4.5 to 5.5 V
• CPU: 3.5 to 5.5 V
• RAM: 1.3 to 5.5 V

LC72322N Pin Configuration

Magnum_Deltaforce_CPU_LC72321N




































Internal View of LC72322N

Magnum_Deltaforce_CPU_Internal_Diagram











































LOOKING BACK...

The DELTAFORCE rear chassis has possibly the largest heatsink installed on any 10m Transceiver and is very heavy duty. Ideal for cooling the dual output transistors. Also mounted on the rear chassis is SO-239 aerial socket, CW KEY 3.5mm jack socket, EXTension SPeaker 3.5mm jack socket and permanently connected DC power cable, shown below.  


DeltaForce_Rear


The metal serial number plate is rivited to the rear of the chassis and reads: 
DELTAFORCE 
MAGNUM 

AM / FM / SSB / CW 10 METER MOBILE 
SERIAL NO 91200000
MADE IN PHILIPPINES


Later production models / versions of the DELTAFORCE were given a new look with ICE-BLUE make-over for the S/RF Meter and LCD.


DeltaForce_BLUE


MAGNUMDeltaForceFrontSIDE
 


MAGNUM
OMEGAFORCE
S45


 RF LIMITED produced the MAGNUM  OMEGAFORCE S45 a few years after the DELTAFORCE, which was essentially the same Transceiver. 
Several changes to the Face Plate are noticable. The introduction of a Black coloured "border" around five of the buttons and the addition of numbers 1-9 
surrounding most of the rotary controls. MagnumRadio.com was printed above the S/RF Meter, OMEGAFORCE S45 above the LCD and MAGNUM printed top-bottom on the right hand edge of the Face Plate.

OMEGAFORCE_ORANGE 

The OMEGAFORCE S45 was also supplied in an ICE-BLUE version

OMEGAFORCE_BLUE



The OMEGAFORCE S45 had slightly more RF output power at 40 watts PEP compared to the DELTAFORCE's 30 watts PEP RF output.

The Magnum OMEGAFORCE S45 box is shown below, featuring the new logo (top left) and a Big Rig Truck and Trailer in the background.

Magnum_OmegaForce_S45_Box_Front




















Magnum OMEGAFORCE S45 view of rear box below.

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Magnum OMEGAFORCE S45 Operating Manual, below.

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INSIDE

The Magnum OMEGAFORCE has several revisions of chassis and from the below pictures you can see some of the changes introduced.

citation needed.

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later chassis

citation needed.

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Looking back

citation needed.

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HIGH POWER VERSION

citation needed.

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INSIDE HIGH POWER AMP

citation needed.

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citation needed

Magnum_Omegaforce_S45_bare_front










Citation needed...

MORE TO FOLLOW..........
UNDER CONSTRUCTION........


Magnum OmegaForce S45


 

The OMEGAFORCE S45 was also furnished with the addition of the 
RF LIMITED CP-1 VOICE COMPRESSOR (All-mode voice Compressor)
And the RF LIMITED MD-1 TOP GUN MODULATOR (AM only Modulator)

TopGunCP1

The below waveform shows the effect the MD-1 has on AM modulation with an almost double increase in amplitude.

Top_Gun_MD1_waveform

 

200mv P-P 1KHz Sine Wave At Mic Input

 

AM Modulated Signal With The Top Gun Modulator In The OFF Position.

Same Modulated Signal With The Top Gun Modulator In The ON Position



Cobraworxshopz Technicians like the Magnum DELTAFORCE and OMEGAFORCE S45 Transceivers. The Magnum's are well worth owning with fantastic Transmit TX modulation, although many operators complain about poor receiver rejectivity (bleed-over) from adjacent channels.
.
Fundamentally
Flawed Operation?
 

To answer the question, no not really but the biggest issue Cobraworxshopz have discovered is that both Transceivers have a design 'flaw' that makes the Transceivers awkward to use, especially for DX operators. Unlike the Cobra Transceiver MKV or Ranger RCI-2950DX for example, the Magnum's do not have continuous tuning. This means the 1khz digit (last digit) on the frequency counter can only count from 0-9Khz, it cannot count up-to-10Khz. 
Put simply, to continuously tune up or down the band in 1Khz frequency steps, firstly you have select the 1Khz frequency step, adjust the frequency from 0-9Khz, tuning past the "5Khz" frequency, then select the 10Khz frequency step to move from 9Khz up-to-10Khz, then select the 1Khz step to continue from 11-19Khz, then repeat the process all over to go up to 20Khz and so on...
 
This issue has been enough to force some owners to sell in search of a 
more relaxing and less complicated experience.

Apart from the flaw mentioned above, both the 
Magnum DELTAFORCE and OMEGAFORCE S45 
are great feature packed Multi-Mode Transceivers.


COBRAWORXSHOPZ
07508-148-148
+44 (0) 7508-148-148


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