Hi all I have been reading through the threads and have found that there are several Ferrite cores suggested fortunately I have them all ... FT 37 - 43 T 50 - 6 T 50 - 2 BUT can anyone sugest and

You should take a look at Amidon's (or other vendor's) specifications for cores. For a given composition, induction can be estimated from the specs and then confirmed from the actual wound inductor

Hi. Please may I introduce myself to the group. I am G0UCP. I am not a market gardener. Relieved to hear that Ashhar only detained by weddings. Have built the O.P. mic. and B.F.O. stages (including Q

Ok, so I've uploaded the file to... http://groups.yahoo.com/group/BITX20/files/G8NXD/ I've renamed it to "one_bidir_pcb.zip" There are going to be other modules and hopefully a complete BITX PCB,

A file has been added to <BITX/FILES/MODIFICATIONS/List...> representing a quick collection of most of the ideas for BITX modifications that have appeared thus far on the forum. I hope this will st

Hi All   And thank you for the reply ... I am all up for experimentation and the BRATS club in UK now has 5 set under construction some much slower than others as they have to buy the parts from po

...in which your correspondent waits for the family to sleep then fruitlessly searches his QTH high and low for the notable iron ring with it's somewhat impaired yellow paint job, in order to break it

Hi!   Here is link giving more detailed core loss versus frequency data for various cores.   http://www.micrometals.com/materials_index.html   73   Rahul VU3WJM Ashhar Farhan wrote: Do

Fried torroids Well just thought I had to add my own contribution on this topic... In my BITX20 I have used 1/2 inch black plastic tapwashers from the local hardware store. I also had purch

All A little more inforamation has been added to the BITX20/FILES/MODIFICATIONS/... section of this forum. Please feel free to add your own ideas as well. Anything that you add should be somehow r

Dear friends,           It is a pleasure to inform you all that VU2ITI Prof TK.Mani had won (first price)  PICtail Design Contest sponsored by MICROCHIP Inc, recently.  The contest was to design and

Hi, as mentioned before, I am building the BITX20 for the 18MHz band (so it becomes a BITX17 I guess). The IF filter is made of x-tals of 4.9152 MHz, because I have many of them. The VFO is changed

In practice the arrangement works fine but I'm a little concerned about the input and output impedances (50 ohms and 200 ohms respectively) of these amps and the effect particularly on the filter term

Please, help me, I drew the circuit board of BITX-20 (equal to: Photos/G0BAK/G0BAK BITX PCB.jpg) of the .zip file of the project but I am having some difficults with the position of components, in

Hi Folks, It looks like the list has gone quiet. I've just uploaded to the FILES directory two more module PCB's. The RF Mixer and the Xtal Filter. I have also included a scale in GIF format to enab

Today I was looking for brass shimming in my local metals recycle centre but instead I found a perfect source of Aluminium chassis for a blob-job with a control panel ( aka Manhatten et. al. ). T

G'day Troops, They say that 'Idle Hands are the Devil's Playground', and as it was a bit too chilly to mess about on my workbench in the garage I sat perusing the circuit of the BITX20 in my warm lit

Ok BITX20'ers, receiving the email below from Heinz OE5EEP last night, reminded me that I have some toroid-frying news. Regardless of the invalidity of microwaving toroids to determine RF suitability,

Chris - PA3CRX Excellent Mod for the BITX20.  I just did it and it works just like you said it would. Thanks, Arv - K7HKL ------------------------- Proposed Modification BITX20 To improve

Hi all, I had printed a posting but now I can not find the original one back... The posting says that if the curve of the x-tal filter is measured an known, the position of the BFO frequency should