Amateur Radio Kits.in

Amateur Radio Kits.in
Website Working Now ! New Products Added

Friday, July 18, 2014

Bitx Version 3C

For those of you wishing to build the Bitx 3 with ADE-1 Mixers the good news is that the PCB's are ready for the Bitx Version 3C.   There have been no other changes in Bitx 3C

The Bitx3C has been tested and performance is good. I shall publish a video soon of a working set.
 Published below are two pictures of Bitx3C.

Bitx Version 3C Solder Side with ADE-1 Mixers
                                        
Bitx Version 3C Components Side 
      The Bitx Version 3C PCB And kit will be available by next week onwards.

Thursday, June 26, 2014

Bitx3B VFO complete band coverage with zero drift

A new video of Bitx3B is being shown here, which has the following improvement:

1. Full coverage of 20Mt band from 14.000MHZ to 14.350MHZ
2. Zero drift with varicap tuning diode.

The varicap is 1SV149  .   They work up to a maximum of 10V biasing and capable of a C max of 500pF at 1V bias. so we can manage from 8V regulator easily.

This device was suggested to me by my good friend MVS  Sarma from Hyderabad. India.
After trying this device i did not think twice by replacing it with MV209.

So now we have a very stable VFO with BITX3B giving a complete band coverage, who wants a DDS anyway for a mono  band tcvr ........

      VIDEO OF BITX 3B  FULL COVERAGE WITH STABLE VFO  WITH NO DRIFT

Missing ground track in exciter, band pass filter stage.

Kindly correct the band pass filter stage in the Bitx3B pcb which has a missing track that should be connected between 39PF and ground for L1 and L2




Monday, June 16, 2014

How to connect Bitx VFO with Ik3OIL FLL

Many friends had requested me to  show how the Bitx VFO could be connected to the Ik3OIl FLL counter to stop the drift in the Bitx VFO.

Presented here is a video and details as how to connect the Bitx VFO with the Ik3OIL freq counter.


First we present the video with the Bitx VFO that is connected with the Ik3OIL Freq counter.
The FLL control circuit works with combination of some components and software on the counter and some parts are on the IK3OIL VFO pcb. The main part being the BB204 varactor diode. A buffer stage has been taken from the Ik3OIL VFO pcb.

In this demo we powered the bitx VFO and the Ik3OIL Counter . You may observe that after the red led stops to blink the FLL takes control and stabilizes the VFO.
In the demo i have also rotated the main tune and fine tune capacitor which gives complete coverage for the 20mt band. There is no drift as the tuning is stopped and the FLL control takes the new readout and starts to control the VFO.

This demo has been done on the Bitx version 3 exciter.

I would welcome any one who wants any more help.

                                                     


BITX VER 3 WITH Ik3OIL FLL CONNECTED

                                              

               IK3 OIL VFO PCB USED WITH THE SET UP





                        BITX VERSION 3 EXCITER PCB



                           FLL FREQUENCY COUNTER



  1. Some important points to be noted: 
  2.  In VFO use Polystyrene Or NPO capacitors
  3. Use RG174u for all RF connections
  4. 12 Volts can be taken to the FLL VFO pcb from the bitx power supply 



Labels

Open A Paypal Account Here

Sign up for PayPal and start accepting credit card payments instantly.

Google Analytic