GEK SSB HF Transceiver


Page update as on 22/2/2017


  • 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 for pro’s and con’s studied the design and 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 IRF based transistors 
  • SA602 Front end mixer with Single side PCB 
  • VFO/BFO PLL Si5351
   Gold series (Mid range) for Amateurs:

  • Dynamic Mic 
  • Pushpull Power amplifier (RD06HHF1 as driver and two RD16HHF1 as PA) 
  • Double side PTH PCB 
  • Double DDS VFO/BFO
    Diamond series (High range) for Professionals: (a challenge to commercial transceivers)

  • Dynamic Mic / Audio Compression 1:1 to 15:1 
  • Double DDS VFO/BFO 
  • 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 balanced diode mixer for excellent dynamic range with 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
VFO/BFO
PLL Si5351
DDS AD9834
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

Double balanced diode mixer for excellent dynamic range with Double side PTH PCB


GEK-2 Silver Series
 (100Watts DUAL BAND SSB HF TRANCEIVER KIT)




  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: 
(Silver Series)

  • Band 1: 7 -7.300MHz ,Band 2: 14 -14.350MHz 
  • SA602 Based Design 
  • Receive sensitivity: 0.15µV 
  • Audio derived AGC
  • Digital Si5351 PLL based VFO/BFO
  •  RIT +/- 10KHz 
  • 2x 16 LCD display  for Frequency/Signal readout 
  • 4-pole, 2.7 kHz crystal filter 
  • 100Watts Push-pull Power Amplifier 
  • 5Watts audio output built in high efficiency speaker 
  • Condenser Pipe PTT microphone 
  • Reverse - Polarity protection
  • Supply Voltage: 13.8Volts DC @ 20A 


Price: Rs7500/-
Add on Dynamic PTT MIC Rs650
Shipment cost extra   


GEK-2: GOLD Series 
 (SSB/CW / DIGITAL Now With Double DDS)







     The GEK Gold series is a Mid range high performance Low-noise, low cost SSB HF transceiver. The local oscillator is stable DDS VFO and DDS BFO/Carriers oscillator. 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.

Features & specification: 
(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
  • Add on CW / Digital
  • 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
  • 12-14 VDc @3A
  • Reverse - polarity protection,
  • Internal self-resetting fuse

Price: Rs11,500/-
Add on CW/ DIGITAL Rs500/-
Shipment cost extra          


GEK-2: Diamond Series 
 (Now With Double DDS) 
This design will challenge commercial transceivers







          The GEK Diamond series is a high performance Low-noise, low cost SSB HF transceiver. The local oscillator is stable DDS VFO and DDS BFO/Carriers oscillator. 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.

    An approach has been made by combining the stage of circuits of Ten-tec, Kenwood, Elecraft, Icom etc. studied the design and formed a new design to give an ultimate high performance HF transceiver to Indian hams.

Features & specification:
(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
  • Add on CW / Digital
  • 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
  • 12-14 VDc @3A
  • Reverse - polarity protection
  • Internal self-resetting fuse 
Price: Rs15,000/-
Add on CW/ DIGITAL Rs500
Shipment cost extra 


Comparison Of All Models








NOTE: 1
Specification, design and cost subject to change without prior notice.

NOTE: 2

These Units do not covers any Warranty, Guarantee or any other kind.No exchange and no money back offer.These are homebrew units to be competitive to commercial Units. 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.


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

Test Video - 1 : GEK -2 Gold Series





Test Video - 2 : GEK -2 Gold Series



                         
Test Video - 3 : GEK -2 Gold Series
On 20Meter


    
Test Video - 1 : GEK -2 Diamond Series


   

VU3GEK /KJ6LRR
N.Ganesan
Coimbatore
Tamil Nadu
South India

vu3gek@gmail.com
91-9363105352 (whatsapp)


"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


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