New PCB Bitx3B 3C Exciter And PA

The new printed circuit boards for Bitx3B Bitx3C And PA are ready, these are the boards on which we have done the modifications for RX antenna cut off on transmit mode.

 Good news the kits for Bitx3B and Bitx3C are ready and we shall start selling them from 1 March 2015 on wards. Keep a watch on our website and ebay shop if you would like to purchase the kit.

Published below are a few pictures  of our  new  modified Bitx3B and PA built recently.

 A brief summary of mods done for new boards are as given below.

 1. Bitx3B Exciter,mod done to disconnect of Exciter RX Ant on Transmit.
 2. Bitx3C Exciter, mod done to disconnect of Exciter RX Ant on Transmit.

 New PA Board mod done:

 1. Disconnection of RX Antenna on Transmit at P5.
 2. Selection of 12 or 24 Volts for Final.
 3. Capacitors 0.01 across all four IN4007. 4. IN4007 across both relays.
 4. PC Fan 12 Volts for cooling transistors.

Bitx3B Exciter Silk Screen 

Bitx3B Exciter  Solder Side 

Bitx3B/3C PA Silk Screen 

Bitx3B/3C Solder Side

Bitx3B Built Exciter 

Bitx3B/3C Built PA

stationqrp.com on our blog list

Do you have a blog or website on Ham Radio that you would like us to include on our Blog list, then kindly send us a request with your website or blog URL.

The first request came from stationqrp.com  and we have added this very informative website on our cqbitx blog list.

Kindly also place our blog link on your website once you see your website URL on cqbitx blog.

Thanks and best of 73s

Sunil

Bitx3B 3C kits being packed .

We are pleased to publish this news that a lot of fresh 50 kits for Bitx 3B And 3C are about to be fully packed. The new stock will be sold on our ebay shop and our website.

 http://stores.ebay.com/FUSION-RADIO-VU3SUA

 http://amateurradiokits.in

The new kits include Bitx3b Bitx3C And PA pcb upgraded with some minor but important mods.

                                    The picture below shows some kits in packing stage.

Components Packs for bitx kit 

The Bitx3b/3c case as also ready and ready for sale.

We shall be bringing news soon for opening the sales for this lot of kit.

Thanks and best of 73s

Sunil

New Schematic And Mods Bitx3b/3c

The Bitx3b/3c construction manual is being updated and will be available very soon, we are making some corrections to it, also some mods have been done on the exciter and pa  for both versions.
The main mod being oscillation in PA caused by feedback. We have used a diode switching arrangement to cut of the RX antenna on Transmit, the mods were required on both exciter and pa board.
The new schematic for bitx3b/3c and pa can be download from this link.

https://drive.google.com/folderview?id=0B6TiQJ3zQGGlNWRIcl80RE9WUVU&usp=sharing

The new kits that will be sold now will have these mods done, how ever these mods can also be taken up in the existing pcb's you may have purchased.

The following files will been found with the download link.

1. Bitx3B Exciter Sch, with mod done to  disconnect of Exciter RX Ant on Transmit.

2. Bitx3C Exciter Sch, with mod done to  disconnect of Exciter RX Ant on Transmit.

2. New PA Sch with mod done to:
Disconnection of RX Antenna  on Transmit at P5.
Selection of 12 or 24 Volts for Final.

0.01 Capacitors  across all four IN4007 diodes

IN4007 diodes  across both relays.


New Printed Circuit Boards of Bitx3B, Bitx3C Exciter And PA will have these mods done. The earlier Bitx 3B/3C PA boards can be modified as with above details. The earlier boards can also use relay instead of the diode cut off switch for the Rx antenna as per one's wish as both systems work.

Bitx3C Pictures

Here are some latest Bitx3C pictures .   I hope these pictures help Bitx3B And Bitx3C  builders .

Later I will be posting some Videos  of Bitx3C  .

Best Wishes.

Correct Sch Bitx3B AGC

Kindly find the correct Bitx3B AGC  complete details of schematic, silkscreen , components layout.

I am extremely sorry that we had earlier uploaded and sent a wrong schematic of the Bitx3B AGC.

Note:R16  Value 10k to 15k.  10k works ok

Uploading Pictures And Posting On CQ Bitx

We are inviting Bitx version 3 builders to contribute with article and pictures of their built Bitx tcvr on Cq Bitx blog .

To seek an invitation to  Upload  pictures  and Post on our blog , kindly send a scanned picture of your license to establish the authenticity of your Ham Radio Profile, with your name, email etc

The invitation to post pictures and write on CqBitx will be sent as soon as we have your profile details.

Kindly email me at vu3sua@gmail.com for your request.

Best of 73s

Sunil  VU3SUA