------------------------------------------------------------------------ Echo Flag : Permanent: N Export: N Personal Read: N BBS: SWEDX Conference: SHORTWAVE Imported: 2/21/1993 To: ALL Num: 9311 Date: 2/18/1993 From: REID KELLY Re: Time: 11:05 am Subj: New Antenna Tuner Prvt: N Read: N Hello Wayne! Friday February 12 1993, Wayne Sarosi writes to John Mudge: This is also worth asking for comments on. Here is a test case, though. It is a simple Pi-network antenna tuner for MF/HF receiving applications. Still a bit crude, but better than straight ascii characters. Also I would very much like to hear comments from all readers one way or the other in regard to using hi-bit ascii for purposes of diagramming things. I am not in any manner advocating their use for cosmetic signatures, etc. =========================================================================== MF/HF PI-NETWORK RECEIVER ANTENNA TUNER =========================================================================== .01 mf L1 TO RCVR >**************************************************< TO ANT * * > * ***** 365 ***> ***>365 < 1 Meg *** *** pf *** *** pf > 1/2 W ***** * * * < 1N914A * TO GND >**************************************************< TO GND NOTE: L1 will vary in size depending on frequency range desired. NOTE: Voltage rating of components is not critical for receiving applications. NOTE: Connectors should be good quality coax connectors. NOTE: Use a good earth ground, not water pipes. NOTE: Tuner should be constructed in a shielded housing. NOTE: 1 Meg resistor is for static discharge. NOTE: Back to back 1N914 diodes protect against strong local signals such as a transmitter in close proximity. =========================================================================== John Mudge -!- FMail 0.92 ! Origin: -->point MUDGE bbs * V.32b * Shelton, WA USA<-- (1:352/111) ___ Blue Wave/QWK v2.11 --- GEcho 1.00/beta+ * Origin: The CatWalk BBS Davie, Fl 305-370-3528 ZyXel 16.8K V.32 (1:369/8)