Hi all, In the Microwave & RF April 2008 issue there are two interesting articles.
1) Large-Signal Approach Yields Low-Noise VHF/UHF Oscillators In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications. Ajay Kumar Poddar, Ulrich L. Rohde Although a lot of mathematics involved there is an interesting circuit diagram for an oscillator running at 144MHz that should help to understand the design. 144Mhz use is certainly a selection due to our friend N1UL. Congratulations Ulrich. You may read the article at: http://www.mwrf.com/Articles/ArticleID/18646/18646.html 2) Cut Loss In Low-Voltage, Wideband PIN Attenuators Variable attenuators based on the pi (p) configuration can be designed with frequency coverage spanning multiple octaves, from the high-frequency (HF) range to the lower microwave region. As a result, they are suitable for numerous wideband applications, such as in satellite television and cable-television (CATV) systems. The use of PIN diodes in these attenuators enables them to be realized as low-cost components and compact alternatives to ... Chin-Leong Lim This is a quite clear reading and also good learning about a solution on how to improve PIN attenuators with low voltage control. See http://www.mwrf.com/Articles/ArticleID/18648/18648.html Best 73 Gian I7SWX ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
