tag:blogger.com,1999:blog-7217848554003301149.post4080859736629755789..comments2024-02-12T00:06:05.306-08:00Comments on BITX Hacks: An VFO for the BITX40Ashhar Farhanhttp://www.blogger.com/profile/07932711010920453477noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-7217848554003301149.post-37514947744862690122024-01-05T15:31:31.175-08:002024-01-05T15:31:31.175-08:00Loovely postLoovely postMDK IShttps://medium.com/@mdkisnoreply@blogger.comtag:blogger.com,1999:blog-7217848554003301149.post-34755419156574730932020-03-18T10:09:25.961-07:002020-03-18T10:09:25.961-07:00Generally speaking, the component values not shown...Generally speaking, the component values not shown are determined by a combination of factors, most importantly the wavelength we want to use the vfo on, and the value of the available variable capacitor that constitute the L/C "tank" circuit, in this case the one shown as 200 pFd.<br /><br />Any value between 250 and 100 pFd. will work for HF work; however, we generally want larger values for longer wavelengths, and lower ones for higher wavelengths.<br /><br />The coil is then wound to put the rig on frequency, and the tap adjusted to provide good feedback for oscillation.<br /><br />The output capacitor is pretty clearly shown as a 10 mFd ceramic, but the value is not terribly critical.<br /><br />If you are going to attempt to duplicate this design, you will go nuts trying to line up the exact values. All homebrewing involves some experimentation and measurement to determine if the values on hand can be made to work.<br /><br />Good luck. It may seem daunting, but it isn't that hard!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7217848554003301149.post-52370524210309456722019-07-12T15:53:59.607-07:002019-07-12T15:53:59.607-07:00COPPONONTS VALUES/COIL WINDING DETAILS ARE INCOMPL...COPPONONTS VALUES/COIL WINDING DETAILS ARE INCOMPLETE :-<br />COIL, FET , S1 DIODE, O/PUT CONDENCER VALUE Etc<br />Anonymoushttps://www.blogger.com/profile/06939394271251814979noreply@blogger.com