All components arrived here today. I have counted them all out into the component packs and despatched them. Note that I have two spare packs, if any latecomers would like one: price is £8 + £0.28 UK

I found it (surprised myself). It's now in the file section in a folder named "hp_parts_xref". Six .gifs, all about 250K. I found these files on the internet a few years ago and as far as I know i

Hi all Looking at the PA diagram it is indicated that from the antenna there are two inductors L1 and L2 but the details below indicate L4 and L5. Can anyone confirm that L1 = L4 and L2 = L5 73 G

I agree with all Jim's comments about the use of FET's salvaged from PSU's etc in power amplifiers for bands 40m or below. I always like to use "recycled" components wherever possible. But when it co

In the "files" section of this forum I have uploaded a small spreadsheet program called "RESONANCE CALCULATOR.xls". This is a spreadsheet program that helps calculate inductance, capacitance, or freq

Dear Forum,   Suppose I plan to have some band selection in future, after 'original' 14 MHz has been set up.   I just need confirmation about my frequency 'plan' table below, is this correct in

Hi all Saw this page whilst searching the web http://www.web-ee.com/Schematics/Inductance%20Meter/Inductance% 20Meter.htm It describes the construction of a simple inductance meter which is an add

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 fr

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 witho

Please I do not have the 10MHz crystals to make the filter, but I have 5 pieces of 8MHz crystals with this 8MHz crystals is possible to make the filter with new values of resistor and capacitor?And

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 U

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 o

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 int

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 unmarke

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 th

Thanks a million, Monty, Great job. And thanks to Arv Evans for sharing this circuit :-) Regards, John ============================================= email: k5jhf@... photos: http://photos.ya

Hi PC Board material that is stored for some time usually takes on a layer of oxidation that hinders soldering components to its surface.  In the past I have routinely used sandpaper to remove this

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Hi, following Arv Evans's useful tips I would like to share with you how I built a non-conductive screwdriver to regulate capacitor trimmers. A quick glance at the BITX20 schematic did not reveal an

Hello to the BITX20 group (this is my first posting on this forum). Farhan and myself have exchanged a couple of off-forum emails regarding mods to his excellent design. One interesting possibility