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COBRA 200 GTL-DX
Cobraworxshopz.com Technicians have recently been perfecting the Cobra 200 GTL-DX Transceiver. We now offer a range of approved modifications by the Manufacturer and a number of our own designed to realise the potential
Cobra released Six (6) different revisions of 200 GTL-DX chassis. 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
PLEASE NOTE:
Shown below is a Revision 1 PCB number # (PFM-0090A-BB)
The Six (6) Cobra 200 GTL-DX Chassis start at 0090A-BA through to 0090A-BF (-BA.B.C.D.E.F) Further visual differences on the PCB are shown below between The REV1 PCB shown below with Transistor legs through PCB
The REV2 PCB below with the Transistor legs soldered
Next difference is the output stage devices for REV1 note: Some late REV1's also used 2SC2290.
Shown below is the REV2 output stage with the
Another visible difference between REV1 and REV2 is the REV1 uses HAN KUK HR90 Shown below.
The REV2 later chassis PFM-0090A-BE uses a TX/RX Switching relay, below.
The Cobra 200 GTL-DX REV2 & REV3 was shipped with
Another view of the NIGHTWATCH High Voltage circuit.
PCB Low-Res photo seen below of the CPU "Main-Brain" of the The same SMD 80-pin CPU device is used in the Made in JAPAN (0515 HAL) the CPU device number is;
COBRAWORXSHOPZ TECHNICAL SERVICES COBRA 200 GTL-DX MODIFICATIONS
1: Receiver audio distorted and Transmit audio warble modification Does your 200 receiver overload when receiving a strong signal, resulting in distorted audio.?? Do you ever get reports of a warble on your modulation when transmitting.?? The latter due to RF bleeding into the front-end. This mod cures both the Receiver audio distortion and Transmit warble. 2: Frequency Calibration We correctly adjust the VCO to within Cobra Factory specification. 3: Adjacent Channel NB (Noise Blanker) modification This superb mod reduces the adjacent channel rejection when the Noise Blanker is switched on, a must for all REV1's. 4: Echo Delay Speed modification This modification effects the digital delay to “Speed-up” the echo effect 5: Talkback - Fixed and Variable level modifications available This mod adds adjustable-volume talkback or fixed-volume talkback. Talkback allows you to monitor your Transmit audio from the Speaker. 6: Low Audio modification (noise cancelling mics) The 200 Modulation may be low with some noise canceling microphones. This mod increases Transmit audio level. 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
Cobraworxshopz.com Technicians 9: Unlock the Fine clarifier for RX ONLY!! - same as This mod unlocks the 'Fine' clarifier to make it RX receive ONLY, just like the 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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