COBRA 200 GTL-DX

"NOTHING Comes Close to a Cobra"

Cobra Electronics (Chicago USA) manufactured the 
COBRA 200GTL-DX in the Philippines from Summer 2003 until Winter 2007 and was the first Cobra multimode transceiver utilising "NightWatch" technology.








































The Cobra 200GTL-DX was incidentilaly, the first multimode transceiver Cobra Electronics had produced since the early 1980's.
(see Cobra 148GTL-DX)

Expectations were extremely high for Cobra's latest transceiver and early
pictures of the 200GTL-DX looked,      .....simply stunning.....

































































NightWatch Electroluminescent Technology, (above and below picture) enables the Face Plate to illuminate, especially useful for 
night-time or low light-level use.
















The first 200's Cobra produced had NightWatch Face Plates and High Voltage units, that could "light a room" due to the 
brightness of their Face Plates.
Later revisions of 200 the Face Plate brightness was toned down

 
Shown below is a as supplied brand new COBRA 200GTL-DX
Summer 2003 Revision 1 (REV1) (PFM-0090A-BA Chassis)
(check out the Cobra "mail-in" rebate card..)

During production 2003-2007, Cobra Electronics produced Three (3) Revisions and  Six (6) different Chassis of the 200 GTL-DX. 

On this webpage, Cobraworxshopz show how to recognise the different revisions of Cobra 200GTL-DX and share specifics. 

CHASSIS NUMBERS #'s

With the Top Case of the 200 removed, look on the left-hand side of the main Printed Circuit Board (position arrowed) for the 
PCB CHASSIS REVISION number.

Shown below is a Revision 1 PCB number # (PFM-0090A-BA) 
SUMMER 2003.

Shown below is a Revision 1 PCB number # (PFM-0090A-BB)

Shown below is a Revision 2 PCB number # (PFM-0090A-BD)











Shown below is a Revision 2 (Late) PCB number # (PFM-0090A-BE)

Shown below is a Revision 3 (NEW) PCB number # (PFM-0090A-BF)

The Six (6) Cobra 200 GTL-DX Chassis start at 0090A-BA through to 0090A-BF (-BA.B.C.D.E.F)

COBRA 200GTL-DX
CHASSIS

Visual differences of the Chassis are shown below between 
the 200's REV1 and REV2 / REV3.

The REV1 PCB shown below with Transistor legs "Through-PCB"
 (centre of picture) rectangle-hole in PCB.

The REV2 PCB below, with the Transistor legs soldered 
in the normal hole-through way, (no hole cut in PCB) AKA-REV1.

Next difference, the output stage...
 
Devices for REV1 
(HF50-12F devices x 2)

note: Some late REV1's also used 2SC2290...!!

Shown below is the REV2 output stage with the 
Toshiba  2SC2290 x 2 devices

Another visible difference between REV1 and REV2 is the 
TX/RX switching relay.

REV1 uses HAN KUK HR90 Shown below.

The REV2 later chassis PFM-0090A-BE uses a 
SANYOU DSY2Y

TX/RX Switching relay, below.

The Cobra 200 GTL-DX REV2 & REV3 was shipped with 
Factory switchable Talkback, using the Echo On/Off control. 
The below picture shows the speaker side bottom cover removed. 
The NightWatch High-Voltage unit (metal box) with multiple wires can be seen, attached to the side of the 200 (bottom of picture).

 
Inside the "Metal Box" (seen above) is the Electroluninescent High-Voltage circuit / PCB. 

A Top-down view of the High Voltage Unit below.

Another view of the NightWatch High Voltage circuit below,
Check out the 105 degree Centigrade Electrolitic Capacitors and HV823 
4-pin dil "driver" integrated circuit. The 5-Volt Regulator transistor and 
HUGE "Tesla-Style" coil can be viewed at the top and middle of picture.  

HEATSINK

Shown below are the underside and rear views of the 
200 GTL-DX Chassis with the Heatsink removed. Notice the two 2SC2290 RF output transistors and RF driver RD16HHFC1






































MICROPROCESSOR
CPU CONTROL

Low-Res picture seen below of the CPU "Main-Brain" of the 
Cobra 200 GTL-DX

The same SMD 80-pin CPU device is used in the 
Cobra 150 and 200 GTL-DX

Made in JAPAN (0515 HAL) the CPU device number is:

CM21CDF-6CH8

COBRAWORXSHOPZ


COBRAWORXSHOPZ

TECHNICAL SERVICES

COBRA 200 GTL-DX MODIFICATIONS

1: Receiver audio distorted and Transmit audio warble modification

2: Frequency Calibration

We correctly adjust the VCO to within Cobra Factory specification.

3: Adjacent Channel NB (Noise Blanker) modification

4: Echo Delay Speed modification

5: Talkback - Fixed and Variable level modifications available

6: Low Audio modification (noise cancelling mics)

7:Squelch modification

If your Squelch chops in and out or sounds 'feathered' this mod will make the Squelch threashold more precise.

Cobraworxshopz.com Technicians offer the following modifications for

 Cobra 200 GTL-DX REV2 & REV3 Transceivers

8: Expand the Clarifier range from 5Khz to 11Khz Swing

Developed for REV2 Transceivers this mod Expands the Clarifier range 
from 5Khz to 11Khz giving more 'Swing' to the Clarifier.

Cobraworxshopz.com Technicians 
offer the following mod for 
Cobra 200 GTL-DX 
REV1 and REV2 Transceivers

9: Unlock the Fine clarifier for RX ONLY!! - same as 
Cobra 148 GTL-DX

This mod unlocks the 'Fine' clarifier to make it RX receive ONLY, just like the 
148 GTL-DX.

This mod transforms SSB operation on the 200 and keeps your Transmit frequency locked when you tune Stations in using the Fine control. The Coarse control changes Transmit and Receive frequency as standard.

 Please see our Services for latest pricing.

Telephone Cobraworxshopz on;

+44 (0) 7508-148-148.

 


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