Connecting Bitx With DDS

Om Tony Fletcher has sent in details of connecting the DDS with Bitx.
Thanks Tony!  As Tony is using the DDS with the Bitx, he has found it working 100% Ok

BItx Complete Kit & Case

  COMMING UP!

BITX VERSION 3 TCVR KIT WITH CASE

Complete Kit with LCD Frequency Counter -Components and Case

About Bitx

Bitx is an easily assembled ssb transceiver for all bands and for the Amateur Radio Operator-Hams, with very clean performance.Hams can home-brew the QRP TCVR by Using ordinary electronic components.



                                        Bitx Components

                              Bitx Connectors and heat sinks

                                              Bitx Coils

                                                                  Bitx Front View

                                                                 Bitx Rare View

                                           Bitx Side  View

                                                          Bitx Case Inside View

                                                           Bitx Case

Size :
Length 9.5 Inches
Width 8.5  Inches
Height 4    Inches

LIST Of Parts With Bitx Case

2 10K POTS
2 100K POTS
MIC CONNECTOR MALE
FEMALE HEAD PHONE JACK
CHROME LED HLODERS
RIT SWITCH
4 SMALL KNOBS & 1 LARGE ONE
SPEAKER
POWER SWITCH
FUSE HOLDER

LIST OF COMPONENST FOR BITX KIT

CAPACITORS
0.001u 2
0.1u 44
100p 3
10p 2
15p 2
2.2p 2
220p 5
560p 3
39p 3
elec 1u 2
elec 50u 6
elec 220uf 2
elec 2200uf 50v 2
var 22p 3
var50pf 1

RESISTORS 1/4W
6.2 1
10 9
22 3
56 1
100 13
220 14
470 3
47K 1
10k 4
120k 2
1k 14
220k 1
2k2 11
4k7 3 1
lin 10k 2

XTAL
10MHz 5

TRANSISTOR
2N3904 14

IRF510 1
2N2219 1

IC
LM386-N1 1

DIODES
zener 36V 1
zener 9.1V 1
zener 5.6V 1
1N4148 13

TRANSFORMERS
INDUCTORS

T37-6 3
T37-43 7
Ferrite Beads 1
Band Pass Coils 3 Metal 2 extra sent for using as cover in mixer and BM

OTHER
Microphone 1
Loudspeaker 8ohm 1
Relay 12V 3 vie

Complete Parts for a Frequecy Counter IK3OIL FLL

With LCD .Pic 16f628 And Parts

FLL FReq counter

YOU GET PARTS AND PCB FOR FRQ COUNTER

 

                                                     The delivery time is 7 to 10 days


                 The Complete Kit is sent by Registered Parcel By

                                   Indian Postal Services

Bitx In Japan & Brazil

In the last two months there was a lot of interest developed by Japanese Hams for the Bitx Version 3 Kit, and a few kits were shipped. I would be anxious to have any updates and post them on CQ BITX
Our friend from Brazil Om Celso is a very keen home brewer and has already started his Bitx. I congratulate PY2FDX Celso from Brazil and posting some pictures which he has been kind in sending.

15 Watts With Bitx Vr 3 Linear

Om Farhan had posted some interesting details on increasing the power output in the
Linear of Bitx Version 3. More info can be found out by viewing post on 15 watts linear
in Yahoo Bitx forum.

The present mod is very simple and with a 12 V battery that is effectively 13.5 volts
would give a output of 15 watts. With a 24 V DC supply the output may be higher .
The circuit with mods is being published here for Bitx members.

Kindly make the mods and give your feedback.

Silkscreen Error on Bitx Main Board

There are two errors in the latest Bitx Board that you have got lately.
The first is a 2k2 which should be 220 ohms, that is right side of Q11 with a .1 capacitor in between.
The second is .1UF between pin 1-8 which should be reversed, a 10uf capacitor would be better in place of 1uf.

Increasing Gain of LM 386

The Bitx may be giving a low audio output for some. To increase the output I searched for some articles on Sprat and came across an interesting article.With just a few mods in the existing board the audio Gain of LM386 could be increased by 2 to 3 times.

It would be interesting to try this out. I will be trying it out myself and will put up the results. would request my friends to try it out and email me the results.

The article from Sprat to increase the audio gain of LM386

New PCB and Kits

Some buy links for a few new Kits have been placed.
The following are the new PCB and kits

1. A two PCB set for DDS VFO, all info can be found n Ham Radio India. Org.
We plan to make this into a Kit, but presently only the PCB are offered.

2. A Linear Amp 50 Watts PCB. An article has been published in QST for this linear.
We presently offer this as a semi kit, which includes a PCB and 2 Final Transistors
IRF 510

3. A Dummy Load Cum Power Meter. This is a complete Kit. All info can be found on
Ham Radio India. Org

4.S.Meter with 4 Led. This is a complete Kit.

The case for Bitx is ready as informed earlier. I still have to make a small write up for it,and arrange suitable packing for it. But if any one is interested then kindly do email me for the case.
The front Panel is available in three types
1. All controls in one line with VU meter and LCD
2. The other design which is not in a straight line is available in VU meter LCD
and the second one with a Bar Graph S.meter and LCD.

Shorty I will put up pictures and details for a set of PCB that can be used for 2 bands, and a pcb for switching between LSB and USB and and as well as a PCB for switching the Filter for SSB and CW.