tag:blogger.com,1999:blog-35901825.post4425470025928050397..comments2024-03-19T06:03:40.451+10:00Comments on marxy's musing on technology: ARNSW Home brew 80m DC challenge receiverPeter Markshttp://www.blogger.com/profile/13007012724570360389noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-35901825.post-2868862692945466652013-07-12T22:37:40.458+10:002013-07-12T22:37:40.458+10:00Alex,
that doesn't sound right - having the c...Alex,<br /><br />that doesn't sound right - having the capacitor change the volume of the sound. If you have a CRO or frequency counter you should be able to see the local oscillator at pin 6.<br /><br />Do you hear any stations? Maybe the local oscillator isn't running for some reason?<br /><br />I'm sorry but I'm travelling at the moment and can't make comparisons with my Peter Markshttps://www.blogger.com/profile/13007012724570360389noreply@blogger.comtag:blogger.com,1999:blog-35901825.post-37689196608095796932013-07-12T17:05:53.766+10:002013-07-12T17:05:53.766+10:00Thank you very much for quick answer=)
For capacit...Thank you very much for quick answer=)<br />For capacitor 180 pF Im using 5-285 pF. When Im tunring it I can only hear the changes in loudness of sound. Its very strange. If this one should tune the frequency, I would say that mu tuning is too short. The other two capacitors can tune well. Yesterday I have used the 80 pF for tuning and 50 pF for fine. Is it wrong? Can you tell me please which of robototechnikhttps://www.blogger.com/profile/13907610866869395669noreply@blogger.comtag:blogger.com,1999:blog-35901825.post-56764554630113599692013-07-12T16:48:30.427+10:002013-07-12T16:48:30.427+10:00Hi Alex,
the largest variable is used for course ...Hi Alex,<br /><br />the largest variable is used for course tuning and the smaller ones for setting frequency or as a fine tuning knob.<br /><br />In my version I played around with these values to get the tuning "feel" I wanted.<br /><br />PeterPeter Markshttps://www.blogger.com/profile/13007012724570360389noreply@blogger.comtag:blogger.com,1999:blog-35901825.post-64551601759451233522013-07-12T07:45:56.638+10:002013-07-12T07:45:56.638+10:00Hi, Im Alex from Germany, I have built the same re...Hi, Im Alex from Germany, I have built the same receiver using your circuit, its pretty cool and seems to work, all the components Ive used are smd. Can you tell me please what do all the 3 variable capacitors control? The 180 pF, 80 and 50. Which of them should I use for tuning and how can I make tuning fine?<br />Thank you very much for your answer!<br />Regards.<br />Alex<br />robototechnikhttps://www.blogger.com/profile/13907610866869395669noreply@blogger.comtag:blogger.com,1999:blog-35901825.post-9499517822835223442011-03-18T02:56:55.459+10:002011-03-18T02:56:55.459+10:00Sounds very good for SSB
Dave
...Sounds very good for SSB<br /><br /> Dave<br /> vk3aseAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-35901825.post-71576951065760008192011-03-07T12:10:58.828+10:002011-03-07T12:10:58.828+10:00John,
I've added the circuit as you requested...John,<br /><br />I've added the circuit as you requested. I assume this is "fair use" and I most definitely recommend anyone interested grab a copy of the book. This example is almost a throw away early on before the authors get serious - but as you see it works remarkably well.<br /><br />73s<br /><br />PeterAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-35901825.post-3586269829145625042011-03-07T06:37:00.303+10:002011-03-07T06:37:00.303+10:00Well done Peter, nice and compact with good audio....Well done Peter, nice and compact with good audio. Any details of circuit or is this part of the challange ?<br /><br />Regards JohnUnknownhttps://www.blogger.com/profile/00057817502739165212noreply@blogger.com