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Hi Since Farhan's stated original intent in designing the BITX20 was to provide an inexpensive transceiver, maybe it would be appropriate to show BITX builders an inexpensive way to measure unmarked

Has anyone measured the Q of the toriods? I wondered whether it mattered too much provided the winding details were observed. However care has to be taken with the coating materials. There is an

Bharat The turns on that coil were sloppy because I got tired of winding them. There are 150 turns of #42 wire on that coil. While it does work at about the intended inductance I would probably be

Hi, This is indeed a good idea. I have a question - basic becuse I'm very new to this field! I noticed that some of the turns are closely wound while some are not. How does this affect the

OK, those are cute. And way cool, ESPECIALLY the parallel LC config that uses the cap's legs for termination and mounting. I love this place. Jim N6OTQ

Hi In converting the BITX20 design for building my BITX40 transceiver I found myself 'experimenting' with several different sets of air-core toroid inductors. Soldering, removing, & re-soldering

Hans When working with really small wire (ie. you don't have anything better to work with!) try twisting two or even three conductors together and use this as one wire to wind your toroid coils.

Nice one Arv! Now we're on the subject I'll share my own method and experiences in case it helps anyone. I don't have available nice new spools of wire labelled 28 or 32 swg. I do have a junk

Hi All What a great idea ... wish I had thought of it my self -- a bit more control than using an electric drill !! Charles G4VSZ

Hi Twisting the wires together for winding trifilar inductors is made easier with a simple tool built for that purpose. A picture of my "Trifilar Twister Tool" is attached to this email. A copy of

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 : /K7HKL/BITX20 FREQUENCY CALCULATION SPREADSHEET.xls

Hello again Chris, If you want to follow the "from scrap" route, you'd better use 8.86 MHz crystals from defunct color TV sets or the 14.318 MHz ones from old and/or defunct PC motherboards...

No problem! My favourite varicap is a standard 5mm red LED. Have a look at my 30m QRSS beacon project http://www.hanssummers.com/radio/qrss/index.htm which used one for the frequency shifting to

Following Farhan's mention of my frequency counters... http://www.hanssummers.com/electronics/equipment/radiofreqcounter/intro.htm this one is a full 8-digit counter. On the other hand, you can

Hi! In order to use 4.915mhz xtals for SSB filter I suggest taking a look at SSB mods for K1 http://it.geocities.com/giulianoi0cg/k1_page.html Or the SSB adaptor schematics of K2 rig. Both use

the VFO of BITX20 has an interesting story. it is actually my inductance meter! looking at the VFO, if you removed the trimmer, it becomes a test oscillator that iuse at all times. this idea is due

Hi all I was at my local radio club the other night and was discussing the possibility of using the BITX on RTTY .. This prompted the following responce from one of the members ... "The elegant

Hi Juanjo, SSB and sets have read lower and There are more reasons for making the filter in the range 10 to 12 MHz, one for example is that lower IF x-tal ladder filters are difficult for SSB, for

A quick frequency calculation spreadsheet for the BITX-xx has been placed in the FILES section under K7HKL/BITX.... This should help resolve some of the questions regarding alternative IF Filter

Hi all I note that the post has separated part of the url from the web page mentioned - let's try again ---- www.web-ee.com/Schematics/Inductance%20Meter/Inductance%20Meter.htm You need all