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Total 16 documents matching your query.

1. [AMPS] SB-220 input circuit (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Mon, 02 Aug 1999 12:37:15 -0400; badly designed for 10 meters, and that results in lower output. Mine has a relatively high input SWR (ca. 1.8:1 on the part of 10 meters I'm interested in) and suffers from low 10m. output (ca. 800; /archives//html/Amps/1999-08/msg00031.html (8,254 bytes)
2. [AMPS] SB-220 input circuit (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 2 Aug 1999 10:09:24 -0700; ? In the SB-220, the input pi-network has a Q of somewhat less than two. For a solid-state radio, a Q of c. two is needed to obtain a good match. . Rich... R. L. Measures, 805-386-3734, AG6K, www.vc; /archives//html/Amps/1999-08/msg00034.html (9,072 bytes)
3. [AMPS] SB-220 input circuit (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Mon, 2 Aug 1999 13:05:21 -0500; network is meters match this? input Your experiment has just proved that the mismatch is between the input network and the tubes, not on the transceiver side. 1.8:1 is very acceptable as I know of n; /archives//html/Amps/1999-08/msg00040.html (9,634 bytes)
4. [AMPS] SB-220 input circuit (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 2 Aug 1999 19:33:06 -0400; It doesn't make any difference what the source is, transistor or tube, in setting SWR. SWR is set only by the load impedance, and the impedance of the line to that load. If I adjust an input network; /archives//html/Amps/1999-08/msg00048.html (9,020 bytes)
5. [AMPS] SB-220 input circuit (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 2 Aug 1999 19:35:49 -0400; Hi Pete, Part of the problem is lead lengths and component tolerances, as well as wiring dress. There is no solution other than dropping the panel and working on the input. Does your rig normally shu; /archives//html/Amps/1999-08/msg00049.html (8,600 bytes)
6. [AMPS] SB-220 input circuit (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 2 Aug 1999 17:13:23 -0700; -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.cont; /archives//html/Amps/1999-08/msg00050.html (8,348 bytes)
7. [AMPS] SB-220 input circuit (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 03 Aug 1999 01:36:40 +0100; No, not at all. What I *do* see is below-normal grid and plate current compared to the lower bands, and commensurately less output. It's been opined that the problem is not the match to the transceiv; /archives//html/Amps/1999-08/msg00051.html (9,332 bytes)
8. [AMPS] SB-220 input circuit (score: 1): Author: k6ll@juno.com (k6ll@juno.com); Date: Mon, 2 Aug 1999 19:30:09 -0600; On Mon, 02 Aug 1999 12:37:15 -0400 Pete Smith <n4zr@contesting.com> writes: There's some loss in the tuner in the 850, which at least partially cancels any additional power out of the solid state PA.; /archives//html/Amps/1999-08/msg00053.html (9,709 bytes)
9. [AMPS] SB-220 input circuit (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 3 Aug 1999 09:20:43 +0100; I agree with Tom, but there is a caveat awaiting the unwary. Some of the earlier solid state rigs (Atlas 210 for example) were touchy about the antenna matching network that was used. A pi network, g; /archives//html/Amps/1999-08/msg00062.html (8,982 bytes)
10. [AMPS] SB-220 input circuit (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 3 Aug 1999 04:12:48 -0700; ? A Q of only 0.75 on 80m is also part of the problem - but only for solid-state output radios. ? amen. Extending the multimeter wires and adding a ground wire makes this a whole lot easier. Rich...; /archives//html/Amps/1999-08/msg00063.html (8,693 bytes)
11. [AMPS] SB-220 input circuit (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 3 Aug 1999 08:33:52 -0400; A mismatch, by itself, causes no loss unless a dissipative resistance is involved in the mismatch. It certainly can't be power dissipation between the input and the tubes, because the wires are reas; /archives//html/Amps/1999-08/msg00071.html (10,029 bytes)
12. [AMPS] SB-220 input circuit (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 3 Aug 1999 07:36:11 -0700; ? You need a ground wire if you operate the SB-220 with the front panel removed. Otherwise, the multimeter does not work. . - cheers, Pete Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/m; /archives//html/Amps/1999-08/msg00074.html (9,160 bytes)
13. [AMPS] SB-220 input circuit (score: 1): Author: realex@flash.net (bob alexander); Date: Tue, 03 Aug 1999 18:37:48 -0500; -- Replace C-32. It is open or partially open at 10 meters but works fine on lower freqs. That is why there is below normal grid and plate current with full drive. 73, Bob, W5AH -- FAQ on WWW: http:; /archives//html/Amps/1999-08/msg00080.html (8,668 bytes)
14. [AMPS] SB-220 input circuit (score: 1): Author: realex@flash.net (bob alexander); Date: Wed, 04 Aug 1999 06:09:45 -0500; -- Hi Pete, I have seen it 3 or 4 times. The first time was in 1977 shortly after I started work as the ham radio tech at the Heathkit store here in Dallas. The amp was a "warrenty" return and I spen; /archives//html/Amps/1999-08/msg00083.html (9,546 bytes)
15. [AMPS] SB-220 input circuit (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 4 Aug 1999 04:52:28 -0700; ? What was the failure mode for the kaput cathode coupling capacitors? ? Accessing the tuned inputs requires removing the front panel. For a SB-220 this should take no more than ten minutes. - cheer; /archives//html/Amps/1999-08/msg00085.html (9,437 bytes)
16. [AMPS] SB-220 input circuit (score: 1): Author: warrenw@pentek.com (Warren J. Walsh); Date: Wed, 04 Aug 1999 08:25:48 -0400; For anyone with any kind of Heathkit equipment, you might like to check out this page: http://members.accessus.net/~dwentz/kb9jja/heathkit/ It has a wealth of info on Heathkit products, including Hea; /archives//html/Amps/1999-08/msg00086.html (9,151 bytes)

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