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Total 4 documents matching your query.

1. Topband: Preamp info wanted (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sun, 18 Jun 2006 09:15:24 -0500; I ran across an old preamp in my junk box and I am trying to find the source of the design, so I can modify it for AM BC DX. It has an MPF102 JFET first stage and an MC1350 8-pin DIP IF amp chip seco; /archives//html/Topband/2006-06/msg00019.html (7,354 bytes)
2. Re: Topband: Preamp info wanted (score: 1): Author: "Harold Smith" <w0rihps@sbcglobal.net>; Date: Sun, 18 Jun 2006 15:43:20 -0500; John: That sounds like a W1FB preamp that was in QST in August 1988. I have the article and will scan it for you if you want. 73 Price W0RI _______________________________________________ Topband mai; /archives//html/Topband/2006-06/msg00020.html (9,276 bytes)
3. Re: Topband: Preamp info wanted (score: 1): Author: Hardy Landskov <n7rt@cox.net>; Date: Sun, 18 Jun 2006 15:25:58 -0700; John, That was the W1FB, Doug Demaw preamp from QST, Aug. 1988. I too built one and discovered there is an error in the ratio of T2. The impedance ratio should be 112:1 to match the output of the MC1; /archives//html/Topband/2006-06/msg00021.html (7,933 bytes)
4. Re: Topband: Preamp info wanted (score: 1): Author: "donhall161" <donhall161@sbcglobal.net>; Date: Sun, 18 Jun 2006 19:39:16 -0500; John, The preamp is from QST, August 1988, pages 22-24 titled "Preamplifier for 80- and 160-M Loop and Beverage Antennas" Took a while to find it. Could remember seeing it in my reprint file but not; /archives//html/Topband/2006-06/msg00023.html (7,513 bytes)

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