GEK SSB HF Transceiver

Project by N.Ganesan & I.Arun

Silver series (Low range) for Beginners
Gold series (Mid range) for Amateurs
Diamond series (High range) for Professionals

(Diamond series will challenge the commercial transceivers)

Design Goals

These transceivers circuit design follows a standard well-proven approach based on various design & kits available on WWW and modifications have been done.An approach has been made by combining each and every stage of circuit of Ten-tec, Kenwood, Elecraft,Icom etc studied pro’s and con’s formed a new design to give an ultimate high performance HF transceiver to Indian hams.

Silver series (Low range) for Beginners:

Electric homebrewed pipe Mic
Power amplifier with IRF510/ IRF250 transistors
SA602 Front end mixer with Single side PCB

Gold series (Mid range) for Amateurs:

Dynamic Mic / Audio Compression 1:1 to 15:1
Variable IF Band-with 400Hz to 3000Hz
Variable IF Gain Control
Power amplifier (RD06HHF1 as driver and two RD16HHF1 as PA)
Double side PTH PCB

Diamond series (High range) for Professionals: (a challenge to commercial transceivers)

Double balanced diode mixer for excellent dynamic range
Dynamic Mic / Audio Compression 1:1 to 15:1
Variable IF Band-with 400Hz to 3000Hz
Variable IF Gain Control
Pre amp on/off, Attenuator on/off, Agc auto/ manual ,Agc fast /slow
Variable AF Filter
Noise blanker Add on
Pushpull Power amplifier (RD06HHF1 as driver and RD16HHF1 as PA)
SWR Protection
Double side PTH PCB

The GEK mono band series is a high performance , Commercial grade SSB low cost HF transceiver covering entire any one or multi of 160M-10M HF band. The local oscillator is stable DDS VFO. The transceiver comes with inbuilt SWR /Power Meter with digital display readout. Audio compression for excellent transmit audio intelligibility.This circuit design follows a standard well-proven approach based on various design & kits available on WWW modifications have been done.

Considering better IMD and clean linear signal ,power amplifier is based on Mitsubishi RD06HHF1 as driver and a pair of RD16HHF1 as a push-pull.

Features & specification :

GEK1C: Any One Bands

Receive sensitivity: 0.8µV
DDS VFO of tuning step 10,100Hz &1,10,100KHz
16 x 2 Digital Lcd display SWR /Signal / Power / Frequency readout
Variable-bandwidth receive crystal filter, approx. 400-3000 Hz
7-pole, 2.2 kHz Transmit crystal filter
Narrow double-tuned bandpass filters
Switchable Attenuator
Audio Compression range 1:1 to 15:1
IF BW & IF Gain
Rugged 10-20Watts-PEP,SWR protected, PA RF transistors
5Watts audio output built in high efficiency speaker
600Ω / 300 to 3000Hz / 120 ± 3dB Dynamic PTT microphone
SIZE : 180mm (L) x 200mm (W) x 65mm (H)
Weight : 1.5Kgs
12-14 VDc
Reverse – polarity protection, Internal self-resetting fuse

The GEK dual band series is a high performance , Commercial grade SSB low cost HF transceiver covering entire any two of 160M-10M HF band. The local oscillator is stable DDS VFO. The transceiver comes with inbuilt SWR /Power Meter with digital display readout. Audio compression for excellent transmit audio intelligibility.This circuit design follows a standard well-proven approach based on various design & kits available on WWW modifications have been done.