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Monday, November 28, 2016

New batch of 20mt and 40mt Kits

I just wanted to inform my friends that a new batch of Bitx3b 3c kit kitting is underway,
and by this week end our Ebay store will be back with the Bitx sales.

This info has been put up as many friends are inquiring about the availability of our Bitx kits.

Thanks and best of 73s

Sunil 

Thursday, October 27, 2016

CW Tone Generator For Bitx And Other SSB Transcievers

If you have been wondering how to get your Bitx to work CW then we have just launched a CW
Generator Kit. This Kit can be used externally housed in a plastic or metal case.

Please take following notes on working of the CW Generator.



               CW: 700Herz  TONE GENERATOR



This kit can be used as a Morse Code Practice Oscillator and as well as as CW generator for SSB transceivers like Bitx.

           CW can be used in two ways.

1.     By feeding the 700 hertz tone, to the mike input stage of TX.
2.     By unbalancing the carrier by a positive voltage from this Generator, which unbalances the balanced modulator.

Using As a Morse Morse_Code Practice oscillator.

The generator has a side tone oscillator, from which the keying can be monitored. An 8 ohms speaker can be connected to monitor sending of CW.


Controls: The following controls are available on board.

Audio Control:  Control the audios gain of the side tone oscillator

Tone Control:  Control the audio tone gains for the microphone TX input stage.

Carrier Balance: Provides a positive voltage to unbalance the modulator stage in TX for CW

Delay: Adjust delay for keying CW as per speed required.

The generator can be powered by 12 volts from the TCVR connected to with the 5 pins PC connector or by a 9 Volt battery. An On/Off switch facility is also provided on the board.

The CW generator board can also be fitted in the transceiver or transmitter case, the 10K trimmers should be used for this, the 5 PIN PC connector and the RCA connector can be discarded and wires soldered direct on the pads.
For using CW there are two methods, which can be used.

1.     By feeding the Audio tone 700 Hertz from Tone Control Output point,
to the SSB transceiver.
 
2.     By providing positive voltage from point Carrier Balance, the voltage is fed
          to the TX Balanced Modulator stage  to unbalance the carrier .

Power Source:

The unit can be powered by 9 Volt external battery or with 12 Volts from the transceiver being used. The voltage from the tcvr comes through one of the pins of the 5 pin PC Connector on board.

A OFF/ON switch can be used when using the 9 volts battery or a jumper can be placed across the switch pads to power it direct.

Connecting to Bitx.

The unit can be connected to Bitx with the 5 PIN connector of the cw gen and the 4 PIN XLR connector of Bitx with a shielded cable provided.


__________________________________________________________________________________

 

SCHEMATIC CW GEN

BOARD

BOARD


BUILT UP CW GEN
CW GENERATOR KIT

      CW GENERATOR KITS BOM


 

    COMPONENT          VALUE  QUANTITY






     RESISTORS 1/4 WATT 10E 2

     RESISTORS 1/4 WATT 18K 2

     RESISTORS 1/4 WATT 10K 2

     RESISTORS 1/4 WATT 2K2 5

     RESISTORS 1/4 WATT 3K3 2

     RESISTORS 1/4 WATT 4K7 1

     LINEAR POTENTIOMETER 10K 4

     DIODE IN4007 3

     CAPACITOR  DISC 0.01UF 9

     ELECRTOLYTIC CAP 47UF  1

     ELECRTOLYTIC CAP 100UF  25V 2

     ELECRTOLYTIC CAP 3.3UF 63V 1

     ELECRTOLYTIC CAP 1uf  63v 1

     I.C.BASE  8 PIN 1

     I.C.LM386 LM386 1

    TRANSISTOR BC557 2

    TRANSISTOR 2N3904 3

    CONNECTORS WIRE 2 PIN 2

    JUMPERS  JUMPER 0 OHMS 4

     5-Pin DIN Female Keyboard socket 5 PIN 1

     5-Pin DIN Male Keyboard socket 5 PIN 1

    CONNECTOR  RCA RCA FOR KEY 1

    PRINTED CIRCUIT BOARD  CW GENERATOR 1

    SHIELDED WIRE  3 CORE  1.7 INCH 1

    Battery Clip Wire 
1

  Speaker  8 ohms 1

Trimmer Presets  10k 1

Linear  10k  4










We are selling the CW Gen Kit on our ebay store, but there is some issue with ebay as we are not being able to 
relist the kit, due to some technical issue.

The kit can be purchased from our Paypal Link below. After we have received your payment we shall ship the kit immediately and inform the tracking number.

PAYPAL LINK TO BUY CW GEN KIT   


The amount is 12USD inclusive shipping.  

 














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