K1EL
K44 Audio Splitter Board Kit
K44-SPLT
K44-SPLT Schematics
K44-SPLT Manual A.1
8/14/2018
Page 5
Page 1: ...match To solve this once and for all we designed an audio splitter board which takes the place of a Y cable and also solves the impedance mismatch problem Unfortunately it doesn t solve the AF gain adjustment issue but it s a good compromise The K44 Splitter board has three 1 8 inch jacks one jack goes to your radio s external speaker jack a second one goes to you exernal speaker and a third goes ...
Page 2: ...best way to do this is to first tack solder one pin to hold the connector in place and then solder the remaining pins Finally install the audio transformer This must be oriented correctly for it to work properly Note the GD marking on the top of the transformer Rotate T1 so that the position of the GD marker matches the picture above That completes the assembly recheck your component placement and...
Page 3: ...bing closeup Here we have connected the K44 SPLT to an IC 7300 s external speaker jack and are using a Radio Shack external speaker Note that the connection to the K44 is very simple just one cable from K44 SPLT J2 to K44 Audio Input Revision History Manual Rev A 1 Initial Release K44 SPLT Manual A 1 8 14 2018 Page 3 ...
Page 4: ... by fast burst noise such as static crashes These dropouts are very short in comparision to the width of a CW dit or dah and can be filtered out automatically The higher the filter setting the more aggressively dropout reduction is employed Not surprisingly very high settings will distort the CW integrity and will result in copy errors especially at higher CW speeds 25 WPM and above Our recommenda...
Page 5: ...K1EL K44 Audio Splitter Board Kit K44 SPLT K44 SPLT Schematics K44 SPLT Manual A 1 8 14 2018 Page 5 ...
Page 6: ...d before you start Inventory the kit parts make sure you have ALL of them 4 Follow the assembly instructions in order Although not always obvious the order in which parts are added to a board is important and should be followed Sometimes sections are installed and tested in order or there could be a mechanical clearance consideration 5 Keep your Workplace Clean and Orderly Nothing spoils a kit bui...
Page 7: ...ture Wear safety glasses to protect your eyes from flying objects Appendix C Soldering Basics 1 Insert component leads into PCB holes and bend them back slightly to hold the part in place You can either trim the lead now or wait till after the joint is soldered I usually install several parts at one time and then solder and trim multiple leads 2 Place a hot and clean iron tip against both the lead...
Page 8: ...en remove the iron Fig C3 Remove the solder 6 Allow the joint to cool and visually inspect for defects or other problems You should have a solder joint with a bright shiny finish and a profile like that shown in the middle picture below Fig C4 Solder quantity comparison K44 SPLT Manual A 1 8 14 2018 Page 8 ...
Page 9: ...aterials 2 Figure 3 K44 Audio Splitter cabing example 3 Figure 4 K44 Audio Splitter cabing closeup 3 Revision History 3 K44 CW Reader Settings or how to get the best copy out of your CWR 4 K44 SPLT Schematics 5 5 Appendix A Kit Construction Hints 6 Appendix B A Note About Safety 7 Appendix C Soldering Basics 7 K44 SPLT Manual A 1 8 14 2018 Page 9 ...
