http://groups.yahoo.com/group/homebrewtransistorradios/ Homebrew Transistor Radios/Communication Thu, 07 Jan 2010 00:51:48 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5081 http://groups.yahoo.com/group/homebrewtransistorradios/message/5081 All, Elector Magazine's December 2009 issue (still available at some Borders Bookstores) contains radio projects from three rather different viewpoints. Thu, 31 Dec 2009 05:02:29 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5080 http://groups.yahoo.com/group/homebrewtransistorradios/message/5080 DXers, Space Weather News has posted a sunspot trend for 2009. http://spaceweather.com./ What this means for ionospheric propagation modes depends on which on Wed, 30 Dec 2009 20:10:57 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5079 http://groups.yahoo.com/group/homebrewtransistorradios/message/5079 Ramon et al, LF (low-frequency) listeners use the same approach to block 540-1700-kHz AM broadcast from disturbing 160-190-kHz reception. For LF the chokes Wed, 30 Dec 2009 18:30:20 GMT Ramon Vargas http://groups.yahoo.com/group/homebrewtransistorradios/message/5078 http://groups.yahoo.com/group/homebrewtransistorradios/message/5078 Hello Steven et al, I have used a small 10-uH RF choke in series with the antenna lead-in and next to the receiver input to impede VHF TV and FM signals from Wed, 30 Dec 2009 01:36:01 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5077 http://groups.yahoo.com/group/homebrewtransistorradios/message/5077 Ramon et al, Warning: From the home receiver-building perspective, the following has entirely philosophical content. The typical home builder has neither the Tue, 29 Dec 2009 23:35:18 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5076 http://groups.yahoo.com/group/homebrewtransistorradios/message/5076 All, Ramon makes a very important point. An impedance analyzer, variable-frequency impedance bridge, or a dip meter can find a radio-frequency choke's SRF Tue, 29 Dec 2009 23:25:09 GMT Ramon Vargas http://groups.yahoo.com/group/homebrewtransistorradios/message/5075 http://groups.yahoo.com/group/homebrewtransistorradios/message/5075 Hello all, I mentioned something incorrect in my last post. Please, kindly correct as indicated below. Clarifying the topic, if the collector RF choke is a Tue, 29 Dec 2009 21:01:56 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5073 http://groups.yahoo.com/group/homebrewtransistorradios/message/5073 All, Posting your sources for crystals, coils, radio-frequency chokes, and variable capacitors helps all attempting to build test equipment for their Tue, 29 Dec 2009 20:20:58 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5072 http://groups.yahoo.com/group/homebrewtransistorradios/message/5072 All, I don't know much about this magazine. But it's mere existence tells me British hobbyists willingly spend their pounds for their magazine. With good Tue, 29 Dec 2009 20:03:07 GMT http://groups.yahoo.com/group/homebrewtransistorradios/message/5071 http://groups.yahoo.com/group/homebrewtransistorradios/message/5071 Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the homebrewtransistorradios group. File Tue, 29 Dec 2009 20:01:52 GMT http://groups.yahoo.com/group/homebrewtransistorradios/message/5070 http://groups.yahoo.com/group/homebrewtransistorradios/message/5070 Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the homebrewtransistorradios group. File Mon, 28 Dec 2009 06:15:13 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5069 http://groups.yahoo.com/group/homebrewtransistorradios/message/5069 Dave, Thank you for your comments. I hope you can show us an improved pierce circuit before too long. I agree with the ARRL (!!!) in cautioning builders to Mon, 28 Dec 2009 05:28:16 GMT Dave http://groups.yahoo.com/group/homebrewtransistorradios/message/5068 http://groups.yahoo.com/group/homebrewtransistorradios/message/5068 ... And, medical issues and vacation issues tie up some of the secondary knowledge bases. ... Pierce oscillators a quite simple, but do have some limitations. Mon, 28 Dec 2009 00:30:16 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5067 http://groups.yahoo.com/group/homebrewtransistorradios/message/5067 All, Now let us consider a hypothetical shortwave converter. Assume a four-transistor regenerative receiver covering 1,000 to 3,700 kHz already awaits the Sun, 27 Dec 2009 23:37:20 GMT Steven C http://groups.yahoo.com/group/homebrewtransistorradios/message/5066 http://groups.yahoo.com/group/homebrewtransistorradios/message/5066 All, Winter moving activities tie up this group's most knowledgeable (at least among those who have shared their knowledge) pierce-oscillator builder. As the