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Thursday, May 22, 2008
S-Meter For Ham Radio Tcvr
The Bitx design lacks an S-meter and adding one would be great in displaying a relative signal strength. Presented here is a one transistor ultra simple S-Meter designed by F6BQU Luc
Very Interesting our friend Vittorio Bruni IOVBR has added this small wonder S-Meter to his
Bitx Tcvr and sent us some more pictures of his Bitx with the S-Meter installed.
Well done Vittorio! The beauty of Bitx is that we can add on circuits and see the results and get the satisfaction from the outcome.
I would request all my friends who are making the Bitx to send me some pictures of their
Bitx,it does not matter if your Bitx is still under construction.The real charm is seeing so many Hams attempting to make the Bitx Tcvr globally.
Tuesday, May 13, 2008
Ham Radio Qrp Tcvr Bitx. Hombrewed By Om Vittorio Bruni IOVBR New Entry
Our Friend Vittorio has finished with home-brewing of his Bitx and has some excellent comments on the working of his Rx. I am posting some comments and pictures as mailed to me by Om Vittorio Bruni IOVBR
Dear Sunil, my BITX20 works very well ! Now it attends a new suit (cabinet) that I will prepare soon. Vy 73 de I0VBR, Vittorio - Terni - Italy
ALL THE VERY BEST VITTORIO. Congratulations for your Bitx
Vittorio has sent some new pictures with his ATU alongside his Bitx Qrp Tcvr. The ATU seems to be a very good piece of Ham Equipment!
Saturday, May 10, 2008
Ham Radio Qrp Tcvr Bitx. Hombrewed By Om Vittorio Bruni IOVBR
Our very good friend Vittorio Bruni IOVBR has sent us a very good picture of his Bitx Version 3 Tcvr. The Bitx looks excellent with a very nice construction work done. Hope we can get some
more good pictures from our friends who have home-brewed their Bitx.
Thanks Om Vittorio,we appreciate your hard work. There are many hams friends of Om Vittorio who have started building their Bitx. We welcome any pictures sent by friends,so that they can be posted on Cqbitx,the home for Bitx Version 3.
Saturday, April 26, 2008
Qrp Ham Radio Magazines
This post is being written to convey special thanks to my very good friend Vittorio Bruni IOVBR who has sent some very good and informative magazines on Ham Radio Qrp construction circuits.
Vittorio is has designed some very good circuits which are published in these magazines.
Thanks Vittorio and we appreciate your contribution to the Ham Radio World.
Bitx Qrp Tcv Modifications By IW1AXR, Daniel Cappa 2
Thursday, April 24, 2008
Modifications Bitx Version 3 Qrp Tcvr By Om Daniel Cappa IW1AXR
Our Friend Vittorio has sent us modifications for the Bitx version 3 Qrp Tcvr.which his friends Om Daniel Cappa IW1AXR has made and contributions by IK1JNS, Pino Panniello, www.panniello.it . Q5 VfO transistor is now JFET BF245/2N3819 resulting in improved noise performance in this stage.
A single transistor stage has been added in the mic pre amp.Another transistor from one end of the volume control pot to ground mutes the AF amp in transmit. ZRF (RFC 100uh to 1mh) between audio stages and product detector/mod blocks any Rf from getting into audio stages.
Wednesday, April 23, 2008
Frequency Counter Construction Tips
The frequency counter construction requires some careful home brewing.The following points should be taken into consideration which will help you in constructing it and incorporating in your commercial or home brew TCVR,Receiver or Transmitter.
- A soldering Iron with a pointed bit should be used as the tracks on PCB are
quite narrow. - First Mount all the common cathode FND,solder them to the board,after that
check the FND with a multimeter each point of FND,which should glow.Now this step insures that all your FND are working and properly installed on the PCB. - Now mount the 7805,IN4148 and 220 ufd capacitor.After soldering it on the board,now connect 12Volts DC Supply and check if the 5 volt is being generated by your regulator stage.If its giving 5 Volts,then your second stage is completed.
- Now connect all the remaining components,leaving the Pic,which should be connected at the last step.
- After all components are mounted and soldered its time to mount the Pic base and solder it on the board,finally insert the Pic into its base,but do check the correct polarity of Pic.
- Check if all your jumpers are connected.
- Now Apply 12 volts again.The counter will start with all the FND illuminating,but will settle to one digit lighting to zero. This is the safe power mode.
- You can programe the Pic by going through the manual of the frequency counter.
- The small switch is used to programe the counter.
- After programming it connect the VFO of your rig with a suitable resistance,now you will get the frequency output.
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