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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

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 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

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

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

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

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

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

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

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 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

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,

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

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

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

Felipe I first buiilt the BITX20 and am now working on a BITX40 version. That way I can compare DC voltages and RF & AF signals with a working unit as I complete the 40 Meter version. Here are some

Ashtar, I have followed the link to your site:- www.phonestack.com/farhan and the schematic around the LM386 still looks the same as before. Duncan G4DFV

BITXers There are several alternative ways to build various parts of the BITX design. For my BITX40 I chose a PTO type oscillator for the VFO. This uses a layout similar to that done by Jom -