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Total 7 documents matching your query.

1. Topband: BCI chase update (score: 1): Author: N1BUG <paul@n1bug.com>; Date: Sun, 08 Jan 2012 12:45:30 -0500; Prompted by Roger, N1RJ, I decided to do some digging around. Aided by isolating specific stages of my receive signal path as much as possible, and using precision 3 and 6 dB pads at various points t; /archives//html/Topband/2012-01/msg00124.html (8,443 bytes)
2. Re: Topband: BCI chase update (score: 1): Author: "Tim Duffy K3LR" <k3lr@k3lr.com>; Date: Sun, 8 Jan 2012 12:08:32 -0600; Hi Paul: I have tried and tested many commercial and homebrew preamps for use on the TopBand (including those you talk about below). Although all of the preamps work - some work better than others. T; /archives//html/Topband/2012-01/msg00125.html (10,737 bytes)
3. Topband: BCI chase update (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Sun, 8 Jan 2012 13:46:00 -0800; Paul you might want to be careful just shorting the receiver input. This would also put a short on the output of your preamp. This would have the preamp blasted with RF from your TX while trying to f; /archives//html/Topband/2012-01/msg00128.html (6,775 bytes)
4. Re: Topband: BCI chase update (score: 1): Author: "Price Smith" <w0rihps@sbcglobal.net>; Date: Sun, 8 Jan 2012 18:29:37 -0600; Paul, I will agree with Lee. I think the best would be to use a small relay that would open the antenna on transmit and also short it to GND. Nothing touching the Pre-Amp. All Electronics have some v; /archives//html/Topband/2012-01/msg00130.html (7,719 bytes)
5. Re: Topband: BCI chase update (score: 1): Author: N1BUG <paul@n1bug.com>; Date: Mon, 09 Jan 2012 08:00:13 -0500; Clarification: Actually what I had in mind was to place the short at the input of the preamp. I want the preamp protected too. My only concern is the preamp might want to oscillate with a short on it; /archives//html/Topband/2012-01/msg00134.html (7,612 bytes)
6. Re: Topband: BCI chase update (score: 1): Author: "Bill Wichers" <billw@waveform.net>; Date: Mon, 9 Jan 2012 10:57:16 -0500; Why not use a DPDT relay as a bypass... This would allow the antenna side to be shorted to ground and the preamp input to be terminated into 50 or 75 ohms via a resistor, or in the "other" position t; /archives//html/Topband/2012-01/msg00135.html (8,522 bytes)
7. Re: Topband: BCI chase update (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 9 Jan 2012 15:09:14 -0800; On low bands, I routinely put a small (IE 10 pF) capacitor across the input of RF gain blocks to kill the bandwidth and prevent high frequency oscillations. With this in place, they should be fine wi; /archives//html/Topband/2012-01/msg00137.html (7,907 bytes)

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