- 1. [Amps] Autotuner for Amp Input (score: 1)
- Author: Lee Buller <k0wa@swbell.net>
- Date: Thu, 7 Oct 2010 07:40:50 -0700 (PDT)
- Hi Folks.... I am in the process of connecting parts for my homebrew amp and have been struggling with finding a Band Switch. I have several out of an old WWII Tuner that would work. I want a switch
- /archives//html/Amps/2010-10/msg00087.html (7,714 bytes)
- 2. Re: [Amps] Autotuner for Amp Input (score: 1)
- Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
- Date: Thu, 07 Oct 2010 10:55:24 -0700
- ORIGINAL MESSAGE: REPLY: The LDG autotuner does provide a good impedance match, but the only question is whether it provides sufficient Q to provide the "flywheel" effect needed for SSB operation. If
- /archives//html/Amps/2010-10/msg00098.html (7,576 bytes)
- 3. Re: [Amps] Autotuner for Amp Input (score: 1)
- Author: Jim Barber <audioguy@charter.net>
- Date: Thu, 07 Oct 2010 11:23:28 -0700
- This has no doubt been covered here before, but is there a "shotgun" equation or rule of thumb for this? (minimum Q for adequate flywheel effect) In the past I've started with a pi input network with
- /archives//html/Amps/2010-10/msg00102.html (8,973 bytes)
- 4. Re: [Amps] Autotuner for Amp Input (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Thu, 7 Oct 2010 13:58:11 -0500
- Bill Orr recommends around 13pf per meter for the capacitance at the cathode of a GG amplifier. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com htt
- /archives//html/Amps/2010-10/msg00103.html (10,927 bytes)
- 5. Re: [Amps] Autotuner for Amp Input (score: 1)
- Author: Jim Barber <audioguy@charter.net>
- Date: Thu, 07 Oct 2010 12:34:32 -0700
- That works, thanks. Playing with the models shows that designs between 25 and 70 ohms cathode impedance meet the 13pf/meter criteria using a pi-net input with a Q of 4. Above 70 ohms not so much. If
- /archives//html/Amps/2010-10/msg00105.html (11,472 bytes)
- 6. Re: [Amps] Autotuner for Amp Input (score: 1)
- Author: "Jim W7RY" <w7ry@inbox.com>
- Date: Thu, 7 Oct 2010 17:54:01 -0700
- You should be able to pick up a 23rd edition on Amazon.com. 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi
- /archives//html/Amps/2010-10/msg00111.html (12,874 bytes)
- 7. [Amps] Autotuner for Amp Input (score: 1)
- Author: "Jim Thomson" <jim.thom@telus.net>
- Date: Fri, 8 Oct 2010 08:35:59 -0700
- You should be able to pick up a 23rd edition on Amazon.com. 73 Jim W7RY Most of em are typo's and stuff, so be careful. Some of it is silly stuff, like calling it C1 and C1, when they meant C1 and C2
- /archives//html/Amps/2010-10/msg00125.html (12,278 bytes)
- 8. Re: [Amps] Autotuner for Amp Input (score: 1)
- Author: Roger D Johnson <n1rj@roadrunner.com>
- Date: Fri, 08 Oct 2010 12:43:31 -0400
- Here is a good site for calculating impedance matching networks: http://bwrc.eecs.berkeley.edu/research/rf/projects/60ghz/matching/impmatch.html In the old days when exciters had tubes and tuned outp
- /archives//html/Amps/2010-10/msg00127.html (8,274 bytes)
- 9. Re: [Amps] Autotuner for Amp Input (score: 1)
- Author: Jim Barber <audioguy@charter.net>
- Date: Fri, 08 Oct 2010 10:18:08 -0700
- Thanks, Jim W7RY. I did in fact find two used copies on Amazon, but the prices were up there with new engineering books. Perhaps the "eBay syndrome" for books? Also looks like I missed Jim VE7RF's co
- /archives//html/Amps/2010-10/msg00128.html (15,310 bytes)
- 10. Re: [Amps] Autotuner for Amp Input (score: 1)
- Author: TexasRF@aol.com
- Date: Sat, 9 Oct 2010 06:45:55 EDT
- Hi Roger, 50 ohm to 50 ohm matching can be done with two components by using them as a parallel tuned circuit. I have had good results on 6m using a parallel tuned circuit and taping the inductor for
- /archives//html/Amps/2010-10/msg00137.html (9,197 bytes)
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