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...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

I suspect the popular thinking is that "if it is good at 1 GHz, then it should be good at 10 MHz", or something like that. What we really want to know is whether the item is a resistor or insulator

This "put it in the microwave to test for RF properties" comes up in amateur radio publications now and then. I have doubts that this method gives meaningfull results. After all you are testing at

- Hans, you MUST have a death wish - are you QTHR, might just drop an anonymous letter to your XYL hi hi - although, truth be known, have done similar "experiments" myself.......usually after drinking

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 purchased a 3-pack of "delta"

we are all glad that hans survived. he who gets away lives to homebrew another day. there are two things that we are interested in about the tap washers. the Q (unloaded) and thermal stability. As i

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 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 pocket

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

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,

John I too had questions about the RF capability of 'tap washers", so I purchased and tested several varieties that seem readily available here in the US. I found that the semi-clear nylon ones did

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 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

Mike Thanks for the great idea. Sub-circuit PCB layouts using Farhan's bi-directional amplifiers should find application in many other designs as well as the BITX series of transceivers. This

Hi Mike. Thanks for reply .Well i think it will be simple to post the files in the group's file section, if you didn't get it, ask for help.Someone in the list must know how to do it.Thanks also for

Forwarded file by e-mail. cheers, Mike --

Hi Mike. Why don't you put these files in the files section of the group?Here in South America we can't access the qsl.net, so this file will be unavailable for a lot of people interested on

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

Hi Mke, gee - what a nice neat layout - will have to post my hand drawn efforts for a comparison!. de VK3BFA Andrew

I've just uploaded to my website http://www.qsl.net/g8nxd/bitx/bidir_pcb.zip The files describing a small pcb for the bidirectional IF amp used in the BITX20 Tranciever.