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Total 20 documents matching your query.

1. [AMPS] Tuned Input Circuit Q (score: 1): Author: 2@vc.net (2); Date: Tue, 9 Oct 2001 12:09:05 -0700; // By omitting the aforementioned four-letter word that begins with "R", you might have gotten a less verbose answer. // The FCC's Paragraph D says that splatter in a ham-band should not go beyond t; /archives//html/Amps/2001-10/msg00244.html (9,570 bytes)
2. [AMPS] Tuned Input Circuit Q (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 9 Oct 2001 19:05:54 +0100; Amplifiers for 50 and 144MHz often use what look like L-C-L T-networks because the tube's own input capacitance makes it difficult to design a pi-network with sensible component values. What you actu; /archives//html/Amps/2001-10/msg00240.html (9,205 bytes)
3. [AMPS] Tuned Input Circuit Q (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 9 Oct 2001 11:22:54 -0400; No, I "like" ANY network that provides a low impedance from cathode to ground for harmonics of the drive frequency at the cathode of the tube. It doesn't matter what that network is, as long as it b; /archives//html/Amps/2001-10/msg00230.html (9,410 bytes)
4. [AMPS] Tuned Input Circuit Q (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 8 Oct 2001 12:14:09 -0500; That is my point, exactly. They can also be met and exceeded with a parallel or T network. (((73))) Phil, K5PC -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Admi; /archives//html/Amps/2001-10/msg00178.html (7,801 bytes)
5. [AMPS] Tuned Input Circuit Q (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 8 Oct 2001 12:06:08 -0500; You are taking me out of context, Tom. I was replying to Rich's statement that Eimac recommends a pi input network. I was just pointing out that using a parallel network (or none at all) will not vo; /archives//html/Amps/2001-10/msg00177.html (9,357 bytes)
6. [AMPS] Tuned Input Circuit Q (score: 1): Author: 2@vc.net (2); Date: Mon, 8 Oct 2001 06:38:42 -0700; // So why does the AL-1200 reportedly have low efficiency on 15m and 10m? - R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissi; /archives//html/Amps/2001-10/msg00173.html (8,859 bytes)
7. [AMPS] Tuned Input Circuit Q (score: 1): Author: 2@vc.net (2); Date: Mon, 8 Oct 2001 04:22:09 -0700; // Dick Errorhorn used Centralab coupling/bypassing service capacitors as C-tune and C-load tank padders. He also used carbon-comp resistors that were rated at 350V max as equalizer resistors on 450; /archives//html/Amps/2001-10/msg00166.html (8,656 bytes)
8. [AMPS] Tuned Input Circuit Q (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 8 Oct 2001 04:52:00 -0400; None of that matters Phil, because none of that means anything. None of them are concerned about what improper Q or circuit style would do. The only potential problems are a lack of maximum efficien; /archives//html/Amps/2001-10/msg00164.html (9,227 bytes)
9. [AMPS] Tuned Input Circuit Q (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 7 Oct 2001 21:35:36 -0500; Alpha thought otherwise for years. Denny Had thought otherwise for years. Eimac still honored their warranty, and the FCC did not seem to care. (((73))) Phil, K5PC -- FAQ on WWW: http://www.contesti; /archives//html/Amps/2001-10/msg00159.html (8,637 bytes)
10. [AMPS] Tuned Input Circuit Q (score: 1): Author: 2@vc.net (2); Date: Sun, 7 Oct 2001 18:47:01 -0700; // Eimac recommends a low-pass Pi tuned input. // A wise choice, Phil. The guys on AMPS who spent kilobucks on c. +2db imagine it made them the king of the pileup world and they bristle like porcupi; /archives//html/Amps/2001-10/msg00156.html (10,028 bytes)
11. [AMPS] Tuned Input Circuit Q (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 7 Oct 2001 15:52:13 -0500; My comments were related directly to Alpha amps, Rich. Alpha did not use pi network input circuits in the 77 series amps. To prevent drilling many holes and adding expense, the "two-tube" kits furni; /archives//html/Amps/2001-10/msg00150.html (9,616 bytes)
12. [AMPS] Tuned Input Circuit Q (score: 1): Author: 2@vc.net (2); Date: Sun, 7 Oct 2001 11:10:13 -0700; For me, changing the tuned inputs from 52-ohms out to 26-ohms out is preferable, Decrease L1, increase Cout, make Xc-in=20 - 25 ohms (Q=2.5 - 2.0). Tweak for best match. However, a second 8877 is on; /archives//html/Amps/2001-10/msg00146.html (9,470 bytes)
13. [AMPS] Tuned Input Circuit Q (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 7 Oct 2001 09:07:51 -0500; Or the old Alpha trick of using an un-un transformer with parallel tuned networks (when adding a second 8877 in the 77DX) can be employed. This is much easier than trying to tweak a pi network for e; /archives//html/Amps/2001-10/msg00140.html (8,764 bytes)
14. [AMPS] Tuned Input Circuit Q (score: 1): Author: 2@vc.net (2); Date: Fri, 5 Oct 2001 23:54:52 -0700; // Almost is undoubtedly right. In Care and Feeding, Eimac figures Q based on Xc1. // For g-g amplifiers with a tube-type Pi-net tuned output driver, this is undoubtedly true. With a solid-state unt; /archives//html/Amps/2001-10/msg00116.html (11,220 bytes)
15. [AMPS] Tuned Input Circuit Q (score: 1): Author: 2@vc.net (2); Date: Fri, 5 Oct 2001 23:54:50 -0700; // Yes. However, Xc2 raises the Q a bit. If Xc1=15 - 25 ohms, it will quite likely produce a decent match for the transceiver. More Q =s a better flywheel. Less Q =s more bandwidth and not as good a; /archives//html/Amps/2001-10/msg00115.html (8,883 bytes)
16. [AMPS] Tuned Input Circuit Q (score: 1): Author: 2@vc.net (2); Date: Fri, 5 Oct 2001 23:54:45 -0700; // The statement that "or a parallel tuned network" should be questioned. A parallel tuned input will work ok only when the Q requirement is met and the average cathode-Z is close to 50-ohms. cheers; /archives//html/Amps/2001-10/msg00113.html (9,054 bytes)
17. [AMPS] Tuned Input Circuit Q (score: 1): Author: kb7ww@uswest.net (Arthur Moe); Date: Sat, 06 Oct 2001 03:49:20 +0000; Tom or others, Could you please clarify the last of this statement "and not any form of "T" or an L-C-L high-pass pi network. In Bob Sutherland's W6Po 3cx1500 8877 144 and 220 mhz amplifiers ( http:/; /archives//html/Amps/2001-10/msg00112.html (8,530 bytes)
18. [AMPS] Tuned Input Circuit Q (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 5 Oct 2001 20:37:38 -0500; A nifty disk came with the 1996 ARRL Handbook. Among the programs is "pinet." I find this useful in starting out with a new design. You are asked to input R2, which is Rout, C(min), Q, and steps for; /archives//html/Amps/2001-10/msg00106.html (8,866 bytes)
19. [AMPS] Tuned Input Circuit Q (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 5 Oct 2001 21:02:34 -0400; Hi Jeff, Most Handbooks use the Q of one end of the network as the Q, but that is actually incorrect. The actual Q involves all parts of the system. Eimac almost certainly is using the entire networ; /archives//html/Amps/2001-10/msg00105.html (9,859 bytes)
20. [AMPS] Tuned Input Circuit Q (score: 1): Author: kd4lyh@earthlink.net (KD4LYH); Date: Fri, 5 Oct 2001 20:11:10 -0400; This is a multi-part message in MIME format. --=_NextPart_000_0010_01C14DD9.DFF67EC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello List members, Is; /archives//html/Amps/2001-10/msg00104.html (9,365 bytes)

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