Bitx 3C SBL-1 Schematic

After the Bitx3C ADE-1  we present the  Bitx3C  SBL-1 . The schematic is being published here.

The Bitx3C SBL  kit will be soon available on our online store.

Tunning Range For The Bitx3b/3c

Two pictures being published which show the tunning range with 1sv149 being used in our Bitx series.

From 13.994 TO  14.418.  with the same schematic values for the VFO section.

Bitx3C With SBL-1 Mixer

Good News for people who are not being able to find ADE-1 ASK mixer and would still like to build the Bitx3C version. We now have a new pcb BITX 3C with SBL-1 Mixer.

The BITX3C with SBL-1  mixer has been tested completely and works great. we shall be providing the PCB soon on our website as well as on our ebay store.

Also is available  the BITX3C SBL-1  AS A KIT or just a pcb to buy.
we shall provide the schematic but no manual, the same Bitx3B manual can be used as most stages are same, leaving the mixers.

Some pictures below of Bitx3C with SBL-1 mixer, i have also mounted the BC549 in the mic pre amp for Q15 as mentioned in the last post.

BITX3C SBL-1 VERSION BUILT UP FOR DEMO

BITX3C SBL-1  PCB 

                 

Dynamic Microphone For Bitx

Lately I have been using a Dynamic microphone for Bitx3B as shown in pictures below.The audio seems to be quite good with it.

One important part that has to be installed in line of microphone is a 3.3uf  Tantalum capacitor, to block the positive 12 volts TX voltage.

Q15 which is 2n3904 in the mic pre amp stage can be changed to  BC549 which is a  low noise VERSION, 
The gain seems to be better then 2n3904 and much better audio quality, it has to mounted in reverse.

New Pictures Bitx3B

For our Bitx3b builders my priority was to build another Bitx3b tcvr , this one with mods on the PA and Exciter Board. The building up of a new Bitx3b ssb tcvr  for 20mt band has been  greatly  rewarding,

Recently i made many contacts on the air with DX and as well as Local stations in India. The stability of PA is excellent with the mod of cutting off  the RX antenna on Transmit, so NO oscillation's from the PA now.

I have attached some pictures of the new build set.

The audio mute board tends to overlap the PA board a bit, this happened because of adding few extra
components to the PA board mod of antenna cut of to RX on transmit. The audio mute board can be mounted with some extra spacers so that the board sits a bit above the PA Board.

A few of you may have problem with the screws size for the case sent, if you have not been able to find screws locally then kindly send me an email for a set to be sent for your Bitx 3b case.

Some pictures which i took of a new Bitx3B build by me recently.

If any one has problem in building the Bitx3b he can be free to email me

best of 73s

Bitx3B Modules Layout And Connections

                       Here is a complete layout of Bitx3B modules

                        Hope it helps all Bitx 3B Builders.

Bitx3B High Resolution Pictures

We are publishing some latest and very clear pictures of high resolution for Bitx3B Exciter-PA-AGC and Audio Mute modules.

Hope it helps the builders with location of part values etc.

Bitx3B Exciter-PA-AGC-Audio Mute

AGC 

Audio Mute

VFO Stage Bitx3B 

Bitx 3B PA

Bitx3B Exciter