GEK SSB HF Transceiver


“Quality is never an accident; it is always the result of high intention, sincere effort, intelligent direction and skillful execution; it represents the wise choice of many alternatives.” ~William A. Foster

                                                                       Page update 18/2/2017
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:
  • PLL Based Si5351 VFO/BFO
  • Electric homebrewed pipe Mic
  • Power amplifier with IRF Series transistors
  • SA602 Front end mixer with Single side PCB
Gold series (Mid range) for Amateurs:
  • Double DDS With  +/- 2.5 PPM Clock Oscillator
  • Dynamic Mic 
  • Add on CW/Digital
  • Variable IF Band-with 400Hz to 3000Hz
  • 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 DDS With +/- 2.5 PPM Clock Oscillator
  • 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

Comparison of low & high end designs as per noise figure, performance and cost


LOW
HIGH
MIC
ELECTRIC
DYNAMIC
MIC PREAMP
BC547
NE5532
MIC COMPPRESSION
NO
1:1 to 1:10 (SSM2166)
PREAMP ON/OFF
NO
YES (2N5109)
ATT ON/OFF
NO
YES (10/20dB)
AGC ON/OFF
NO
YES
AGC FAST/SLOW
NO
YES
BUFFER
2N2222/2N3904
LT1250
PRE DRIVER
2N3866
2N5109
DRIVER
BD139
RD06HHF1
POWER AMPLIFIER
IRF510
RD16HHF1
MIXER
SA602
SBL-1/ADE-1
SWR PROTECTION
NO
YES
AGC
AUDIO
RF
DDS
AD9834
AD9851
IF GAIN
NO
YES (MC1350)
IF BW
NO
YES(400-3000Hz)
AUDIO
LM386
LA4425
PCB
SINGLE SIDE
DOUBLE SIDE PTH



    The GEK Gold/Diamond series is a high performance Low-noise, low cost SSB HF transceiver. The local oscillator is stable DDS VFO. The Power amplifier is designed as a push-pull Mitsubishi the latest generation of 12V-30MHz Silicon MOSFET Power Transistor. The RD06HHF1 is used in the pre driver and in the push-pull stage a pair Mitsubishi RD16HHF1 were used. The quiescent bias current is set individually for each transistor with improved IMD so that cleaner signal output. The inbuilt 100watts amplifier uses a pair of RD100HHF1 transistor.

Microphone compressor



   This feature compresses microphone audio input to increase average audio output level. The result is that talk power is increased. The compression level is adjustable manually for your preference. This function is effective for long distance communication, or when propagation conditions are poor, gives a Commanding speech cuts through QRM with a punch audio. The analog device SSM2166 integrates a complete and flexible solution for conditioning microphone inputs it is also excellent for improving vocal clarity in communications.

IF BW control
The IF BW control adjusts the receive center frequency bandwidth of the IF passband electronically to reduce adjacent interference.

IF Gain control
The IF gain adjusts response of receiver gain used in weak signal station reception.

Digital S/RF meter
  Built-in multi functional digital S/RF meter indicates signal strength level while receiving and either transmit output power, VSWR ratio while transmitting with SWR High Protection.

AGC ON/OFF, FAST /SLOW
    Smooth, fast attack, RF derived AGC, if you turn AGC off then you use the IF gain control to manually adjust the receiver sensitivity. That might be something you want to do when the background noise is high. Slow AGC is usually best for SSB and AM signals when the signals are much stronger than the background noise. You might prefer fast AGC when static crashes are much stronger than the signal, causing the signal to disappear and then slowly recover as the AGC comes back after the static crash.

Audio Filter
High performance versatile audio filter that can be used to improve intelligibility of CW, phone, or data signals, Low-noise analog variable audio filter circuit used here is a low-pass filter with switched capacitors, elliptical 8th order for improved audio easily compares the reception with that of a receiver equipped with DSP filter.

Audio Amplifier
On-chip protection: Overvoltage protection Thermal protection Output D.C. short protection. On-chip pop noise reducing circuit

GEK-2 Silver Series HF Transceiver

(Now with 100 Watts Power Out )

UNDER DESIGN AND TESTING Available soon ....




     The GEK2-100W is a two band silver series high performance Low-noise, low cost SSB HF transceiver Kit. The local oscillator is a stable Digital Si5351 based VFO/BFO.

    A good opportunity for new comers, home brewers to built their own HF Transceiver and put their first foot step in HF Band, available both in DIY(Do it yourself) Kit and also full tested kit.

   The Transceiver design follows a standard well-proven approach based on a pair of Philips (NXP) SA602 mixers, pre driver is of Motorola 2N5109, driver based on rugged Mitsubishi 2SC1969 and IRF based final 100 watts push pull power amplifier.

   This circuit design follows a standard well-proven approach based on various design & kits available on WWW and modifications have been done.



Features & specification:

 GEK-2-Silver Series
  • Band 1: 7 -7.300MHz ,Band 2: 14 -14.350MHz 
  • SA602 Based Design 
  • Receive sensitivity: 0.15µV 
  • Audio derived AGC
  • Digital PLL Si5351 based VFO/BFO
  • 16x 2 LCD display for Frequency/Signal readout 
  • 4-pole, 2.7 kHz crystal filter 
  • IRF Based 100Watts Push-pull Power Amplifier 
  • 1Watts audio output built in high efficiency speaker 
  • Condenser type pipe PTT microphone 
  • Reverse - Polarity protection
  • Supply Voltage: 13.8Volts DC @ 20A

NOTE:
Unit supplied with assembled and tested with PTT Microphone 
Power supply is not included 

GEK2-X Silver series -----------------Rs/- 
Shipment cost extra

GEK-2 Gold Series HF Transceiver

 SSB / CW/ Digital  

(Now with Double DDS)

X -Second Generation New Model

+ NEW ADDED DDS BFO/Carrier OSC
+ NEW IMPROVED OSCILLATOR for temperature DRIFT Compensation
+ NEW IMPROVED temperature COMPENSATED Power Amplifier
+ NEW ADD ON FOR CW KEY











    The GEK-2 Gold series is a high performance , Commercial grade SSB low cost HF transceiver covering 40M/20M HF band. The local oscillator and Carrier Oscillator is stable DDS VFO. The transceiver comes with inbuilt SWR /Power Meter with digital display readout. 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 :

GEK-2: GOLD Series SSB/CW /Digital
(Second Generation)


  • 40m/20m Bands
  • Band 1: 7 -7.300MHz ,Band 2: 14 -14.350MHz 
  • Receive sensitivity: 0.8µV
  • DDS VFO of tuning step 1,10,100Hz &1,10,100KHz
  • DDS BFO / Carrier Oscillator
  • +/- 2.5PPM Master Clock Oscillator 
  • 16 x 2 Lcd Display for S / SWR / PEP/ Frequency readout
  • 7-pole, 2.7 kHz TRX crystal filter
  • Narrow double-tuned bandpass filters
  • Temperature Compensated Power Amplifier
  • Rugged Adjustable 1-10Watts-PEP, RD Series PA RF transistors
  • 5Watts audio output built in high efficiency speaker
  • 500Ω / 300 to 3000Hz / 120 ± 3dB Dynamic PTT microphone
  • SIZE : 230mm (L) x 200mm (W) x 65mm (H)
  • Weight : 3Kgs
  • 13.8 VDc @3A
  • Reverse - polarity protection,
  • Internal self-resetting fuse

NOTE:
Unit supplied with assembled and tested with PTT Microphone 
Power supply is not included 

GEK2-X Gold series -------------------Rs11,500/- 
add on CW/Digital -----------------------Rs500/-
Shipment cost extra

Add an external low cost 50/100/200/300/500/600/1000 Watts power amplifier

GEK-2 GOLD Series Test video 1
video

GEK-2 GOLD Series Test video 2
video



GEK-2 Diamond Series HF Transceiver

(This design will challenge commercial Transceiver)

  * Now with Double DDS

Second Generation New Model

+ NEW ADDED DDS BFO/Carrier OSC
+ NEW IMPROVED OSCILLATOR for temperature DRIFT Compensation
+ NEW IMPROVED temperature COMPENSATED Power Amplifier
+ NEW ADD ON FOR CW KEY





     



     The GEK-2 Diamond series is a high performance Low noise Commercial  grade SSB low cost HF transceiver. The local oscillator is stable DDS VFO. The transceiver comes with inbuilt SWR /Power Meter with digital display readout ,Smooth, fast attack, R.F.-derived AGC. 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.

GEK-2: Diamond Series SSB transceiver
(Second Generation) 

  • 40m/20m Bands 
  • Band 1: 7 -7.300MHz ,Band 2: 14 -14.350MHz 
  • Receive sensitivity: 0.15µV 
  • Double balanced diode mixer for excellent dynamic range 
  • DDS VFO of tuning step 1,10,100Hz &1,10,100KHz 
  • DDS BFO / Carrier Oscillator 
  • +/- 2.5PPM Master Clock Oscillator 
  • 20 x 4 Digital Lcd display Signal / SWR / Frequency readout 
  • Variable-bandwidth receive crystal filter, approx. 400-3000 Hz 
  • 7-pole, 2.7 kHz Transmit crystal filter 
  • Switchable Preamp / Attenuator 
  • Audio Compression range 1:1 to 15:1 
  • IF BW , IF/RF Gain 
  • Narrow double-tuned bandpass filters 
  • AGC : On/Off , Auto/Manual , Fast/Slow (R.F derived AGC) 
  • Temperature Compensated Power Amplifier 
  • Rugged Adjustable 1- 10Watts -PEP,RD Series PA RF transistors 
  • 5Watts audio output built in high efficiency speaker 
  • 500Ω / 300 to 3000Hz / 120 ± 3dB Dynamic PTT microphone 
  • SIZE : 300mm (L) x 230mm (W) x 115mm (H) 
  • Weight : 3.7Kgs 
  • 13.8 VDc @3A 
  • Reverse - polarity protection 
  • Internal self-resetting fuse

GEK-2 Diamond Series -----------------Rs15,000/- 
add on CW/Digital -----------------------Rs500/-

Shipment cost extra

NOTE:
Unit supplied with assembled and tested with PTT Microphone 
Power supply is not included


Add an external low cost 50/100/200/300/500/600/1000 Watts power amplifier

COMPARISON OF SILVER / GOLD / DIAMOND series HF Transceivers



NOTE: 1

Specification, design and cost subject to change without prior notice. Performance and result may vary with propagation condition, antenna, cable, location and operators mood.

NOTE: 2

These transceiver do not covers any Warranty, Guarantee or any other kind.No exchange and no money back offer.These are homebrew rigs to be competitive to commercial rigs. Service support can be given by supply of components or in house third party service with minimum service charge and shipment cost by the user. 

I have other high priority job, family etc to look after and these projects are done only on free time with interest in amateur radio, I don’t find free time nowadays, lot of hams helped me by giving their valuable feedback and suggestion iam very much thankful to them. 

Shipment of these transceivers outside India is critical we will find the solution and inform you.

As it involves wide range of model it’s hard to keep in stock, booking can be done with advance payment on first come first serve basis.Shipment cost is extra.



Update as on 18/2/2017

X -Second Generation New Model

+ NEW ADDED DDS BFO/Carrier OSC
+ NEW IMPROVED OSCILLATOR for temperature DRIFT Compensation
+ NEW IMPROVED temperature COMPENSATED Power Amplifier
+ NEW ADD ON FOR CW KEY



Only second generation two models are available NOW both are 2band 40M/20M

1) GEK2-X Gold series -------------------Rs11,500/- 
2) GEK2-X Diamond series --------------Rs15,000/- 
Shipment charge extra
Add on CW/Digital -----------------------Rs500/-

For Lead time, booking and clarifications contact me by email with your chosen Model. 

73,
VU3GEK /KJ6LRR
N.Ganesan

Coimbatore
Tamil Nadu,India.
vu3gek@gmail.com


Test video 1 
GEK2C Diamond series




Test video 2 (old model)

GEK2A GOLD series 20Meter DX Contact from OMEN






11 comments:

  1. Wonderful World of Radios. Good Luck.
    73 de VU2UUU

    ReplyDelete
  2. I am really fascinated. Please keep it up. All the best. -
    Atanu, VU2ATN

    ReplyDelete
  3. Great work. These are far more than a typical "home brew" stuff. Congratulations!

    ReplyDelete
  4. Finally it arrives in great style…..GEK thank u for this wonderful design which will help many Hams come on air on HF…..73's DE VU3NEJ

    ReplyDelete
  5. very nice and congratulations. It is a boost to new hams to be on the air at low cost. 73 de jayu VU2JAU

    ReplyDelete
  6. Good Job.. however I strongly feel that you should create a group in yahoo or google for builders who can help each other to solve problem

    ReplyDelete
  7. Good work, keep it up. There has been a real need for affordable, assembled SSB transceivers. Providing assembled transceivers will help those who don't have the time or knowledge to make these equipment. This is a good initiative. 73, VU2ZMM

    ReplyDelete
  8. This is probably the best news for hams. Fantastic. This will surely bring more hams on the air. Best wishes and best regards: B B Mandal VU3MDL

    ReplyDelete
  9. Sudhakaran Pillai5 November 2015 at 10:22

    Great news for beginners like me. Thank ganesan for your great work for Indian hams.waiting for an eyeball. VU3YSP

    ReplyDelete