Hello all, I have successfully got the VFO working for the BITX20. However some questions remain, wondering if I can get some help, comments and advice from the group: 1. The coil has 115turns. I am

Hi Welcome to 100'th member PY2JCM who has just joined! Welcome also to all the other recently joined members. If you are building the BITX20 or are thinking of doing it, and haven't posted here yet,

Thanks Chris, Arv and Ashhar for comments and advice re the squeak. I have checked and the relevant diode is in place. I removed the decoupling electrolytic cap. from pin 6 of the LM386. Interestingl

Hi all, I have a quick question on the mixer transformers used in the BITX20, I can benefit from others' experience. When I started the trifilar winding I noticed that it is quite easy to "braid" th

Hi, I saw the circuit diagram on the internet in July and thought it would be an ideal hf project. I have been collecting all the parts but will not start building it until my Open University course f

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /tokoturns.txt Uploaded by : vu3wjm <vu3wjm@...> Des

Dear Friends, While going thru my old files I found this small text giving turns vs inductance for TOKO coils ( Uploaded under files). This is not my work but of an unknown person to whom I am grea

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /MODIFICATIONS/BITX DC Switching.png Uploaded by : k7

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /BITX PCBs (Printed Circuit Boards)/bitx_component_pla

EB7HPM The new PCB layout looks interesting. How did you design the RIT circuit? Could you upload a schematic of the RIT part of your unit? Thanks, Arv-K7HKL

Hi A new RIT circuit drawing has been added to <BITX20/Files/Modifications/K8IQY RIT Circuit.png> This one is a bit simpler than my earlier circuit, and in true BITX style this design uses an NPN t

Hello all, I have not seen any practical designs for using BITX20 for PSK31 mode. I am still working on completing the assembly but would like to learn more about what mods can be incorporated as I

Hi I'm pleased to say that my BITX20 is now complete and it performs exactly as described. With my 132' doublet it has received excellent reports incuding 59 from PJ4 in one direction and UN7 in the

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /desna.gif Uploaded by : vu3wjm <vu3wjm@...> Descrip

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /MODIFICATIONS/Schema VXO.gif Uploaded by : vdberghak

Greetings fellow BITX20 Builders. I have just uploaded some photos of my BITX20 in the newly completed homebrew enclosure. Still need to add the sides and top but the hard part is mostly done. This

Hi folks, I don't know if this will interest anyone. But I have just obtained a fairly large quantity of minature multiplexed 7 segment LED displays. They have 7 numeric characters and 7 'S' meter, l

Hello As I sit here looking at the BITX20 schematic it 0ccured to me that some of the capacitors may not be necessary: 1) There is a 0.1 mf on the base of Q1, that connects to a 0.1 on the collecto

Hi folks, A little further info on the LED display I have available. Common Kathode . Size 36mm x 20mm 7 Multiplexed numeric characters 7 _NON _ multiplexed leds in a bargraph. They are ideal fo

Respected sir, With due respect I beg to say that I am preparing for ASOC grade-1 and advance grade examination. Recently I was appeared in ASOC grade- 1 and grade-2 examination, which was held on 08/