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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

Builders are reminded that while the IRF510 final may be a little hard to find and may be a little expensive, many other power FETs will amplify quite nicely on lower frequencies, . In the late

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

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,

Hi Arv Thank very much for the spread sheet ... This is something that I will demo at the club during the sessions on the building of the project .. 73 Charles G4VSZ

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

Hi, at this moment I spend hours getting the filter working for the IF frequency of 4.9152 MHz. It is importand that measurements are done with the circuits connected, it seems that the load

one of the inherent problems with 10 MHz if is that it precludes the 10 MHz band. the IF will fall within the RF passband. it might work if you used 14.318 MHz crystals for IF and used the 4 MHz vfo

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 the

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

Charles Just to make sure that all works as anticipated in your club demo of the spreadsheet program...I have attached two versions of the spreadsheet to this email. The one with the .sxc sufix is

MHz, Hi, with the filter directly connected to the antenna you are already on 10 mHz! What is the sense of making a SSB rig for a band that alouds NO SSB? For 10 MHz you can use the same concept

Hi Chris, Which band are you designing it for? 4.915 is too low for 14MHz SSB and sets the VFO tuning quite high and prone to QSY/QRH (drifting). As I have read over there, for SSB IFs over 8MHz are

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

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

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 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

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

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! 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