tag:blogger.com,1999:blog-9071048343455395511.post5272404306669974801..comments2024-03-16T16:06:49.744+00:00Comments on Roger G3XBM's (Mainly) Amateur Radio Blog: 2 transistor transceiver for 28MHz CWRoger G3XBMhttp://www.blogger.com/profile/13673890140751539870noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-9071048343455395511.post-64613952380538371332021-01-28T18:31:52.972+00:002021-01-28T18:31:52.972+00:00Hi Roger,
I built the lesser-chirpy circuit (not ...Hi Roger, <br />I built the lesser-chirpy circuit (not this one) and I have a question.<br />When I use the transmit button (shorting R3 120 to GND) and pressing the KEY, the signal gets weaker and weaker almost immediately until it dies out. <br />Although if I use the Key only (without connecting R3 to GND), I get a stable RF signal out.<br />Do you have any idea what could cause this error, and how could I fix / improve on it? <br />Thanks!Flashguruhttps://www.blogger.com/profile/09607476207612689945noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-70911838680850419472021-01-18T16:43:08.121+00:002021-01-18T16:43:08.121+00:00Hi Fashguru - I am not sure how many turns as it w...Hi Fashguru - I am not sure how many turns as it was so long ago! There is a better version on my website.Roger G3XBMhttps://www.blogger.com/profile/13673890140751539870noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-61907654818574625822021-01-18T16:35:34.286+00:002021-01-18T16:35:34.286+00:00How many turns on the toroid to get 0.4uH? How many turns on the toroid to get 0.4uH? Flashguruhttps://www.blogger.com/profile/09607476207612689945noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-17894818092829601462016-03-13T08:12:22.390+00:002016-03-13T08:12:22.390+00:00See my website www.g3xbm.co.uk for a later design....See my website www.g3xbm.co.uk for a later design. Roger G3XBMhttps://www.blogger.com/profile/13673890140751539870noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-31480458088030603282016-03-13T08:10:15.429+00:002016-03-13T08:10:15.429+00:00pFpFRoger G3XBMhttps://www.blogger.com/profile/13673890140751539870noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-37495531177423586612016-03-13T03:41:10.284+00:002016-03-13T03:41:10.284+00:00I am looking at this schematic, the variable capac...I am looking at this schematic, the variable capacitor and the two unlabeled 47 capacitors, are these pF, nF, or uF?TheToivonenhttps://www.blogger.com/profile/06397544390149905520noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-25717725111781524952011-10-20T10:12:38.980+01:002011-10-20T10:12:38.980+01:00Roger
Did you see this Months PW Carrying On The...Roger<br /> <br />Did you see this Months PW Carrying On The Practical Way The Rev. George Dobbs G3RJV presents two very simple receivers one a FET regen and the other using the mixing technique for your 28 MHz CW transceiver.<br /><br />TonyAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-82120316345663045132011-10-20T09:34:56.170+01:002011-10-20T09:34:56.170+01:00Even simpler?
A car ignition coil and a very narr...Even simpler?<br /><br />A car ignition coil and a very narrow bandpass filter ? :-)<br /><br />73<br /><br />David - G7UVWDavidhttps://www.blogger.com/profile/05184765146324570950noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-7283740271363166282011-10-20T08:26:02.260+01:002011-10-20T08:26:02.260+01:00The amount of chirp on TX is really too excessive ...The amount of chirp on TX is really too excessive on 10m so going any higher would be pushing it Tony. I am still trying to think of other ways of making this rig simpler still!Roger G3XBMhttps://www.blogger.com/profile/13673890140751539870noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-88157788189715226602011-10-20T07:59:18.214+01:002011-10-20T07:59:18.214+01:00Never tried a simple one transistor transceiver on...Never tried a simple one transistor transceiver on four meters.<br /><br />TonyAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-27657438682582808372011-10-20T07:56:01.019+01:002011-10-20T07:56:01.019+01:00Hi Roger
That design is so simple and easy to bui...Hi Roger<br /><br />That design is so simple and easy to build. Thanks again for another future project. BTW with an overtone crystal oscillator could this idea work for six and four meters.<br />A simple CW transmitter with your NE602 converter would be a quick way of getting on Four meters.<br /><br />TonyAnonymousnoreply@blogger.com