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Bitx3C with DDS And 40mt Bitx3C.SBL-1

August 20, 2015, 4:39 am
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Its been quite some time since  i posted any info regarding any new development for our Bitx 3 series
transceivers.

The latest info that i wish to share is that a DDS is ready that can be used with all our Bitx versions, presently for mono band use and very soon for multi band use too.

I have been testing the DDS with Bitx3c SBL for 20mt band , and very soon it shall be boxed up. The DDS kit we have connects directly to PIN 8 of  SBL Mixer while PIN 7 is grounded, no mod is required at all. The FLL can be replaced with the DDS if one wishes so.

Bitx 40 mt series with all versions B And C will be offered as kits very soon.
The 40 mt Bitx 3C SBL-1  has been tested and it gives an output of 7 watts with 24 Volts power supply.
Some minor work remains of connecting the AGC module and Audio Mute module and Boxing it up.
Very soon I shall upload some pictures and video of Bitx 3C SBL 40mt band  and also the Bitx3C SBL-1  with DDS for 20mt band.

Catch up with you guys soon.

best of 73s

Sunil VU3SUA
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DDS FOR BITX VER 3 SERIES TCVR'S

August 24, 2015, 4:03 am
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Test have been done with our DDS to be used with all our Bitx ssb tcvr's .
A 20mt Bitx3C- with SBL-1 mixer using DDS is complete and in the next week we shall pubish some
pictures of the completed set.

Pictures of the DDS we will be using in our kits. The mono band tcvr can use either FLL freq counter
or the DDS.

DDS  FOR BITX VER3 SERIES 


FRONT PANEL BITX VER 3 SERIES CASE WITH DDS
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AGC Bitx

August 25, 2015, 3:05 am
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In our earlier pictures for the AGC module, there was a connector placed in a wrong direction and also the trimmers were placed in the opposite direction.

We are publishing the correct placement again for the mentioned items.
Some care is to be taken in  handing the VU meter as it is quite fragile. Instead of soldering the pins of VU Meter to the AGC pcb it would be better to solder short piece of wire pair and connect to the AGC pcb.

The audio mute pcb is overlapping the PA pcb this happened as the PA pcb was modified for the diode RXcut off switch, suitable spacers can be provided to raise the hight of the audio mute pcb while fixing on the case.







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Bitx Version 3C SBL-1 With DDS

September 7, 2015, 6:47 am
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As promised earlier I am publishing some pictures of the Bitx3C SBL-1 with a DDS for 20mt band.
The set is working absolutely fine with good receive and transmit of 7 watts.

This present set is mono band, but the idea was to use a DDS and also provide DDS with the Bitx 3 kits.

Bitx Version 3C SBL DDS 

Top View 

PA Bitx 

DDS And AGG 

Bitx3C SBL-1 Exciter 

Very soon video of Bitx3C SBL-1 with DDS will be put up on this site and You Tube.





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Bitx Case In New Colour And Models

November 27, 2015, 11:36 pm
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We are trying to bring some new colours and models for Bitx Case .

One of the new colour is  Black And Silver , this is available in two models, the first one is

the Bitx case with additional provision of Menu switches. So now the FLL counter swithes can be mounted on the Front panel of case.

The second model has the facility of mounting DDS function switches on the Front panel. The Encoder is fitting on the Tune control.

We shall be also offering a DDS very soon, that will fit on this Bitx DDS Case.

Bitx 3B/3C Black And Silver Case With Menu Switches For FLL



Bitx 3b/3C Black And Silver Case With Switches For DDS Functions.





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Bitx3C From Poland

January 8, 2016, 8:42 pm
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Recently there has been lot of Bitx building activity from Europe ,radio  amateurs from Russia, Poland ,France And Germany are building the Bitx3B and Bitx3C.
We have received some nice build pictures of Bitx3C ADE-1  from OM Arek    SO5HMI   from
Poland. Congratulation to Arek for completing his Bitx3C and also helping his friends build the Bitx.

Here are some pics as below sent by Arek for Bitx3C ssb tcvr with ADE-1 mixers

BITX3C By Arek SO5HMI 

BITX3C WITH ADE-1

BITX3C VIEW


Arek has also uploaded a Video YOU TUBE for his Bitx



Keep watching have fun, we shall bring in more news about some new developments with our new
Bitx kits. 
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New Pictures from OM Arek SO5HMI Bitx3C

January 15, 2016, 3:12 am
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The earlier pictures of Bitx3C sent by OM Arek from Poland were without the complete wiring etc, so I had requested Arek to send me some of his Bitx3C pictures with complete built up set. 
So now we  have received some nice complete built up  pictures of Bitx3C ADE-1  from OM Arek    SO5HMI   .
Enjoy them. The construction is excellent so as the working set Arek.....Many Many DX with your Bitx3C ADE-1 

BITX3C 20 MT 

BITX3C WITH ADE-1 

BITX3C Arek SO5HM

BITX3C FROM POLAND

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Upgrade of website AmateurRadioKits.In

January 29, 2016, 2:04 am
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Recently we moved our website to a new server, this had to be done for providing our friends a

better view of our products and all the documents for our kits,which are  to be published on our web

pages for a live preview and download. If you wish to purchase our Bitx or other kits,  then kindly do so

from our ebay store Fusion Radio VU3SUA

We are working to make this website more pleasant.

We shall be opening the complete website very soon.

Have a great day…..
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New Kit: JBOT HF Linear Amplifer

March 28, 2016, 4:34 am
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After a gap of long time I have been able to bring out a new kit, from our most popular author Ashar Farhan's collection. Yes its the JBOT kit.

The JBOT has been tested on our designed PCB and works extremely well.
We have used 2N2218, earlier we used 2N2219 which had an higher gain and was giving some problem, but we have found 2N2218 more suitable and also as suggested in JBOT article.

We got a pack of 500 transistors 2N22I8 and so we are glad that we can offer transistor that have  been tested and do not oscillate.

We changed just 2 resistors value  as per the need of the gain of the transistor, and the complete kit was build as per the article.

Kindly find pictures attached below:

JBOT HF Linear Amplifier 

JBOT HF Linear Amplifier kit

Printed Circuit Board JBOT Front

Printed Circuit Board JBOT Rear
This kit can be purchased from our ebay store.

Buy JBOT kit from our store

Only Available in Kit form.



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BITX3C SBL-1 40MT BAND SSB TCVR

May 4, 2016, 1:04 am
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The modular Bitx3C SBL-1 kit for 40mt band  is going to be sold very soon from our ebay store as it has been completed

Publishing some pictures that were taken recently. 

More details and additional info will be mentioned soon.
BITX3C SBL-1 40MT SSB TCVR










BITX3C SBL-1 40MT SSB TCVR



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Error In CD files sent with Bitx3B kit

July 2, 2016, 5:47 am
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Lately we had started offering CD instead of printed documents for Bitx series constructional manuals.
Some how the CD sent had docs with some missing pictures in the file bitx3b construction manual, we
regret that, we are trying to offer the printed documents again so that the mistake does not occur again.

Most of the Bitx3B files can be found on the Bitx Yahoo Forum too.
This link below is okay and the documents seem to be good.

https://app.box.com/s/6g5rj15kgpft1mqxkg7h

Very soon we would work on making all files online with fully correct manuals.

best of 73s
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All About Bitx Version 3 Series.

July 14, 2016, 1:32 am
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Lately I have been asked about our Bitx 3 series transceivers if they are for single band or multi band and what difference our Bitx Kits have between our various versions.

Here is a question I received recently from one of our Radio Amateur member by email.

Hello.
I am looking for the latest model of the Bitx that can work digital modes.
I must admit, I an unable to understand what are the Bitx's versions: Is it a single band QRP TRC, or is it multiplicand TRC with LIN Amp, and what is the latest model.

73
 Mike
 4X1LM


Our Answer to the questions:

The Bitx version 3 series transceivers  we are selling are all mono banders i.e. single band ssb qrp tcvr. 

The First Bitx kit we started was "Bitx Version 3" ;From the original design of OM Ashar Farhan, Bitx20, further with minor modifications,which were done by Om Rahul Srivatava VU3WJM. 

Later we came out with some new versions Bitx3B Bitx3C with mods done by us. 

1. Bitx3B this version has some changes like the VFO is now controlled and integrated with the famous IK3OIL FLL.  So the VFO is now with varactor control tuning, using 1sv149 varactor diode, which can cover 350KHZ. The mic amp has an extra pre amplifier added. 

Some minor changes were done in PA switching TX RX; overall it has been improved upon the older Bitx Ver 3. The Ver 3B also uses the Diode Ring Mixers and Toroids, in the product detector and mixer.

2. We have Bitx version 3C, which are in two versions.

a. Bitx3C using ADE-1 Mixers.

b. Bitx3C using SBL-1 Mixers.

Other features are same as Bitx3B.


3. AGC and Audio Mute stages have been added in Bitx3b Bitx3c 

For digital modes you can use the Bitx3C SBL-1 or Bitx3C with ADE-1 mixers.

Hope I have been able to clear your doubts.



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Hacking Bitx Version3B,3C for 40mt Band

July 21, 2016, 5:10 am
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NEW BITX AGC Adjustments Updates

August 9, 2016, 8:44 am
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Lately many Hams who purchased the AGC kit with our Bitx Kit were having some problem in adjusting the
VU meter to get a deflection. After observing the problem sometimes at my end too i decided to study what would be the correct sequence to set the VU meter.

The setting of 2 trimmers R3A And R5 were found determining the initial settings of the VU meter.
After doing some adjustments with R3A And R5 the correct settings were found as to my way, there can be other ways too.

Below I have provided a silkscreen picture of AGC and short notes to be followed in sequence.
I hope this should help many struggling with setting their meter to move and complete their AGC.

Any one can contact to me if he find still his AGC is not working.

Now Please follow the setting of AGC Meter as below.


AGC ADJUSTMENTS UPDATED

First disconnect antenna from the transceiver or any receiver being used with the AGC module.Also switch the AGC module off from the power source.

 Now follow the steps below in sequence to adjust the AGC settings below:

 STEP 1:
Set point A and B as shown in Fig 1:  AGC silkscreen with trimmer R5 (5K) to 4.9k by tuning the trimmer anti clockwise, use any DMM for this setting. The multi meter leads to be connected between point A and B. We need more adjustment with this trimmer later on. Steps to be followed in sequence leave it at this setting for now.



 STEP 2:
Set point C and D as shown in Fig 1: with trimmer R3A 50K to ZERO 0 ohms by tuning the trimmer clockwise, use any DMM for this setting. The multi meter leads to be connected between point C and D, we need more adjustment with this trimmer later in steps to be followed in sequence.



 STEP 3:

Now connect +12 Volts power to AGC, and adjust trimmer R4 (50K)
To get 4V at IC LM324 PIN 3.  Power off the AGC, we shall switch power on later.


 STEP 4:

Now connect meter pads positive and negative as indicated in the Fig 1:
Silkscreen Layout of AGC with wire’s to the VU Meter negative and positive terminals.


 STEP 5:

Now as the meter is connected with the AGC circuit, power on the AGC,As the AGC is powered the meter will now show full scale deflection towards forward even crossing the scale, now adjust trimmer R3A (50K) so that the meter is within the scale limits to the maximum possible.



           The meter is at max forward position

 STEP 6:

Now adjust R5 (5K ) to get meter to show near to zero reading on the meter, but not   absolute zero reading, this setting can be adjusted later to see how the meter responds to a signal. If you see a slack movement move the setting above a bit zero. This can be tried with trail and error to see at which point the meter is excited best.

                 



The meter setting has been bought near to zero with adjusting R5 (5)

                                                Optimum Zero position for VU meter set


STEP 7:

Now is the time to connect the antenna to your set, tune for a strong signal and adjustR3A (50K) to show Full Scale meter reading.



 STEP 8:

Now adjust AGC level with R7 (2.2K) for a Comfortable Audio.


 STEP 9:

Finally Adjust R3 (10K) for VU Meter movement NOT to jump, but show rather
Steady levels.


 AND THAT’S IT ………





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Bitx3C SBL1 In Black Case

September 8, 2016, 12:29 am
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Quite some time back I had built a Bitx3C SBL-1 with a DDS. Now this DDS has a S.Meter and can be used for 3 bands. presently this rig is for 20mt only using the SBL-1 mixers.
Performance has been great with many contacts been made.

This new DDS will be offered with the Bitx Kits starting this month.
Here are some pictures which I had taken for the Bitx3C SBL-1


Bitx3C SSB TCVR 6 WATTS SSB

BITX3C EXCITER-DDS-AGC 
                             
BITX3C VIEW EXCITER,DDS,AGC,AM AND PA

BITX3C PA 

BITX3C RAER SIDE 

BITX3C FRONT 


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About Hams And Our Present And Future Association

September 8, 2016, 10:00 pm
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"Who are Hams And How are we associated with their activity" ........ The following article explains this.

Hams are people from different walks of life, a Ham's may be a Lawyer, some may be bankers,business men, student,teacher,pilot,scientist,gardener, you name it,in every field of life, there is a Ham enthusiast, It is not necessary to have a formal degree to get a ham radio license, to enjoy the hobby of Amateur Radio.

Hams generate credit of applause by helping, and  providing emergency communications in distress, no matter where the location is.

In the USA ham radio is promoted in Unique ways. You can donate any amateur radio equipment and get concessions on income tax.

Many counties have govt sponsored organisations to fund Ham Radio activities.

Our activity concerns developing Ham Radio kits that are used by Hams around the world. our Aim is to develop  high quality, reliable and affordable Ham Radio equipment's.

We invite Hams to collaborate with us with their own designs and work with us as partners.

We can develop the kits on designs by Hams interested in earning some money for their work and  efforts.

Many Hams have made blogs and websites with projects, but do not reap enough reward's for their efforts, in this direction we invite budding designers to get paid for their effort and collaborating with us in developing new generation kits and providing them to the global community.

kindly send your email to us with your projects and ideas and how you would like to get associated with us in developing the new generation kits for Ham Radio Hobby for the benefit of all.

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Bitx 40Mt Boards On Our Ebay Store.

September 11, 2016, 9:04 pm
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An article was written earlier on this blog regarding hacking bitx20mt for 40mt band.

We had also mentioned that new boards were being made for the Bitx 40mt band. There are very minor changes in the boards, only the major changes being in winding new coils for the Linear Amp, there has been no other change in components. If one was to build the Bitx40t then our article hacking bitx20mt for 40mt band. would be very useful in this regards.

Here are the boards that are available on our Ebay Store Fusion Radio VU3SUA

                      Bitx Version 3B Exciter And PA Board On Fusion Radio VU3SUA Store

The advantage of building our Bitx Kits is that you can purchase the kits in parts. After purchasing the boards if you are missing on parts you could purchase the Bitx Components Kit and later on when you have completed the boards, then you could box them in our various color Bitx Case which are specific made for our kits. 

We shall be publishing some pictures very soon of our new Bitx Case which has been colored in Pepsi Blue And White color.

I will be back soon with more news, enjoy building your Bitx qrp tcvr

best of 73s
Sunil VU3SUA

 
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New Color " Pepsi Blue" Case For Bitx kits And Universal Transceiver Case

September 17, 2016, 11:31 am
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We have recently added some Bitx Case with new colors.

The colors that are available in our Ebay store are : Pepsi Blue, Black And Siemens Grey.

The Pepsi blue case is available in 3 combinations.

First for use with a FLL Freq Counter

Second for use with  a DDS

Third  model Universal Case for Transceiver in this case no holes done or bush mounted on the base cover .

The base cover can now accommodate any type of boards, so if you are looking for a suitable case for your tcvr then our Universal Transceiver Case could be the answer for your search.

The other colors and Black And Siemens Grey .

                                                                     PEPSI BLUE


Bitx3B 3C Case For FLL Counter Pepsi Blue color 


Bitx 3B 3C Case For DDS And Also Universal Case 


           Bitx Case Inner View 

                                                           
                               

Bitx Case Rear View 

BLACK 

Bitx3B3C Case For FLL FREQ COUNTER 


Bitx3B3C Case Rear View 


Bitx3B3C Case For FLL FREQ COUNTER





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CW Tone Generator For Bitx And Other SSB Transcievers

October 27, 2016, 4:58 am
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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 WATT10E2

     RESISTORS 1/4 WATT18K2

     RESISTORS 1/4 WATT10K2

     RESISTORS 1/4 WATT2K25

     RESISTORS 1/4 WATT3K32

     RESISTORS 1/4 WATT4K71

     LINEAR POTENTIOMETER10K4

     DIODEIN40073

     CAPACITOR  DISC0.01UF9

     ELECRTOLYTIC CAP47UF 1

     ELECRTOLYTIC CAP100UF  25V2

     ELECRTOLYTIC CAP3.3UF 63V1

     ELECRTOLYTIC CAP1uf  63v1

     I.C.BASE 8 PIN1

     I.C.LM386LM3861

    TRANSISTORBC5572

    TRANSISTOR2N39043

    CONNECTORS WIRE2 PIN2

    JUMPERS JUMPER 0 OHMS4

     5-Pin DIN Female Keyboard socket5 PIN1

     5-Pin DIN Male Keyboard socket5 PIN1

    CONNECTOR  RCARCA FOR KEY1

    PRINTED CIRCUIT BOARD CW GENERATOR1

    SHIELDED WIRE 3 CORE  1.7 INCH1

    Battery Clip Wire 
1

  Speaker 8 ohms1

Trimmer Presets 10k1

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   

 paypal.me/SunilKumarLakhani/12

The amount is 12USD inclusive shipping.  

 














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New batch of 20mt and 40mt Kits

November 27, 2016, 8:59 pm
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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 
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