Pictures of Working Bitx Ver 3B

It is a pleasure to present  pictures for a complete working Bitx B . 

The Bitx Ver 3B has not been put on sale as yet, although i have sold 3 sets on request.

Two radio amateurs are building the set but are facing some problem in their sets audio.

I will also upload a video very soon giving a live demo of the working Bitx Ver3B in receive and a modulation test on a dummy load and swr bridge and modulation monitored on a commercial receiver.


The Bitx Ver 3 B has some changes that were made to make it much more convenient for operational use.

The changes were.

1. Stable VFO  drift with in 50 to 100 hertz   in time span of few hours

2. Mic Preamp so that there no need to shout in the mic.. hi hi

3. FLL Freq counter connectivity with a buffer added in the vfo

4. Aluminum case

5. Mic PTT and Speaker

                                  PICTURES OF BITX VERSION 3 B

Bitx Version 3 B Completed Pictures of Printed Circuit Boards

During past few days i was able to complete a Bitx Ver 3 B set Exiter and PA Board .Some pictures are being published here. The RX is working okay and the FLL seems to be correcting minor drift.

I have still to place all the modules in the case for final assembly.

PICTURES OF BITX VER 3 B

 

        BITX VERSION 3B EXITER   

          BITX VERSION 3B PA            

           BITX VERSION 3B SET         

Pictures Bitx Version 3 B

At last we have the Bitx 3 B just about ready to be offered as a Kit.

Its a great moment to share some pictures of the Bitx version 3 B .

The pictures are of the Bitx 3B case, PCB set.. Exiter-PA-AGC Module.

A semi finished Bitx 3 B board is also shown.

The process of packing of Kits is on and very soon the sale will start.

I will also upload a video of the working prototype soon, in fact i had already tested 2 boards

earlier .

The complete manual of Bitx 3 B is not ready,but we have details for all the changes and the
schematics too, which will be uploaded on our website http://amateurradiokits.in very soon.

Best of 73s.

                 BITX VERSION 3 B PICTURES

Bitx Version 3 B PCB's Components Layout

After much hard work for a few months the PCB's for the Bitx Version 3 B are ready. Very soon we will start accepting orders for the Bitx Ver 3 B  Kits.  The case is also ready we will be sharing the pictures very soon.

Highlights for the Bitx Version 3 B

1. Basic Operation 20mt band kit

2. VFO  Varactor Tuned

3. Inbuilt Mic Pre Amplifier

4. Audio Mute on TX

5. No Hissing of RX on receive,as a filter is used in audio to suppress the hissing sound

6. Full connectivity of FLL counter and  control for VFO drift

7. Connection points for Freq Counter FLL Type

8. AGC Module Extra Mounted on VU Meter.

This design is an upgrade from Bitx Version 3.  The original Bitx design belongs to the author OM Farhan from India.

This new design was suggested by a few Italian Hams, we took the Basic design and added further mods.

The design made by Italian Hams did not have the Connections and buffer in VFO for the FLL Freq counter,or the anit hissing filter in the audio amplifier. nor the AGC module, which is mounted on back of a VU Meter. So we had to do a lot of testing after making several boards and testing them we finally made these boards.

The good news is that the Manual is being made by OM Leaonard , who has a great experience with the Bitx 3 and Bitx 20a

The Manual may take some time. The basic manual is same only with certain changes in the VFO, Audio and TX Pre amp. So we will presently provide with some head on start notes.

PICTURES OF  BITX VERSION 3B  PCB

                                                                   BITX VERSION 3 B

                                                                   AGC MODULE  

 

AGC MODULE  

                                                            LINEAR AMP

Bitx Ver 3 Built By Paul Cotton

We are glad to share some great pictures of Bitx version 3 as built by OM    Paul Cotton  2E0ELF

from U.K

Paul has built the Bitx 3 with The IK3OIL FLL Freq counter and VFO for 20 Mt band.

Great job Paul, we wish you many qso's with your Bitx Version 3.

Low RF Gain In Bitx 3

If you experience low gain in RF amplifier of Bitx 3 Or Bitx Multiband then please check out the

2SC2570.  We request you to kindly change the 2SC2570 .

I have had problem sourcing  good quality 2SC2570 and some of you may have had the
one with low gain, supplied in the KIT

If your 2SC2570 is not as per the picture below then kindly change it with 2N3904. You would need to change the PIN connections for 2N3904 .

The picture below is of a good quality 2SC2570 if you are having this type it is  ok. The lot number is also given on the transistor.

2SC2570  THIS ONE IS OK . 

I could not get a good picture of the one with low gain, as the marking is not good on it, i will post a picture of it soon.