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References: [ +from:i4jmy@iol.it: 132 ]

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61. [TowerTalk] 40 mtr yagi (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 12 May 2001 20:09:12 +0200; Considering shortened elements and the wide band required from 7 to 7.3, a driven and reflector has three advantages. The Rr is higher thus loading losses are a bit less critical, the antenna Q is le; /archives//html/Towertalk/2001-05/msg00279.html (8,154 bytes)
62. [TowerTalk] dB Loss Equivilents for SWR Values (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 26 May 2001 15:35:04 +0200; The formula you found is correct in the sense that because of a 1:3 SWR the power delivered to a non reactive load by an ideal 50 Ohm generator is 1.25 dB less than it would with a 1:1 SWR. If the ac; /archives//html/Towertalk/2001-05/msg00545.html (10,362 bytes)
63. [TowerTalk] Matching 75 ohm hardline for 3 bands (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 1 Apr 2001 13:19:24 +0200; Assuming matched antennas and raliziong that also reflected power will be attenuated, expecially at 440 MHz. Extra losses because of an 1:1.5 SWR produced by a 75 OHm cable use are neglegible and muc; /archives//html/Towertalk/2001-04/msg00003.html (8,269 bytes)
64. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Mon, 2 Apr 2001 17:51:22 +0200; Hi Chris, You don't frequently find N connectors on amateur transceivers, amplifiers and antennas because they are expensiver than UHF type and mainly because a large number of HAMs doesn't want to l; /archives//html/Towertalk/2001-04/msg00028.html (12,032 bytes)
65. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Mon, 2 Apr 2001 20:37:43 +0200; I'm leader of the RF Division in one company and the stress tests of parts, even desruptive, are routine job in a company that manufactures Broadcast equipment and antenna systems. We have and use al; /archives//html/Towertalk/2001-04/msg00033.html (8,982 bytes)
66. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Mon, 2 Apr 2001 23:20:55 +0200; Hi Brian, I try to reply, doing it between lines. It's not in my style, but tomorrow I've a busy day with "only" four flights (as a passenger) with important business meetings. I need sleep. Premade; /archives//html/Towertalk/2001-04/msg00036.html (12,435 bytes)
67. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Mon, 2 Apr 2001 23:21:47 +0200; Hi Brian, I try to reply, doing it between lines. It's not in my style, but tomorrow I've a busy day with "only" four flights (as a passenger) with important business meetings. I need sleep. Premade; /archives//html/Towertalk/2001-04/msg00037.html (12,518 bytes)
68. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Wed, 4 Apr 2001 17:55:05 +0200; I didn't claim anything about voltage rating of N connectors, but the stand-off voltage of air corresponds more or less to 50 volts per mil. (mil=.001"). Calculation for breakdown voltage in N or BNC; /archives//html/Towertalk/2001-04/msg00090.html (13,514 bytes)
69. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Wed, 4 Apr 2001 21:21:34 +0200; Istantaneous power of a burst has little to do with RMS power since the duty cycle is generally irrelevant. A KW amplifier can generate a peak but the power content of the burst is well within cthe o; /archives//html/Towertalk/2001-04/msg00096.html (13,285 bytes)
70. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Thu, 5 Apr 2001 01:42:25 +0200; If the arc starts, then it could continue at much lower voltage and your description is finally correct and could serve also to describe also what happened inside some failed antenna traps. The pract; /archives//html/Towertalk/2001-04/msg00101.html (11,229 bytes)
71. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 5 Apr 2001 18:02:15 +0200; I never heard of arcing failures with properly mounted N connectors and used with standard equipment and reasonable power, this not only with Ham equipment but also in professional applications. In t; /archives//html/Towertalk/2001-04/msg00114.html (10,637 bytes)
72. [TowerTalk] Connectors (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 6 Apr 2001 10:11:53 +0200; It's not a mith, by construction it is. A properly installed N (right type for specific cable) N it's really a weatherproof connector and with some 5" of self amalgamating tape in outdoor applicatio; /archives//html/Towertalk/2001-04/msg00133.html (8,870 bytes)
73. [TowerTalk] Petrezewski (sp?) array .. (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Fri, 6 Apr 2001 20:55:21 +0200; I didn't actually calculate it, but in open or shorted lines (stubs) used as inductances or capacitors there are extra losses that finally decrease the circulating current in the parasitic element,; /archives//html/Towertalk/2001-04/msg00150.html (10,195 bytes)
74. [TowerTalk] choke AND a balun (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 26 Apr 2001 10:27:40 +0200; as If the existing balun works, the coax choke is totally useless there and it's probably better to collect an excess of cable somewhere else. It depends by the antenna band/s, and by the size of th; /archives//html/Towertalk/2001-04/msg00551.html (7,974 bytes)
75. [TowerTalk] Coax Rating (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 1 Mar 2001 14:57:00 +0100; The reason why an RG8X insn't raccomandable at high power levels is because of a shield that's made of a thin aluminum Foil-Polyester TapeAluminum Foil and only very few thin copper wires as braid sh; /archives//html/Towertalk/2001-03/msg00014.html (11,022 bytes)
76. [TowerTalk] Coax Rating (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 1 Mar 2001 16:35:20 +0100; What I've seen as an RG8X is a smaller cable than the old RG8, slightly bigger than an RG58 and that meets with my description for its shield. This fact doesn't insure that what I've seen is really t; /archives//html/Towertalk/2001-03/msg00022.html (15,553 bytes)
77. [TowerTalk] Coax Rating (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 2 Mar 2001 11:59:56 +0100; This stuff with RG8X is getting interesting. Well, after some researches it seems to me that what is sold in US as an RG8X has a size that's not so different from an RG59, formerly 0.242". The voltag; /archives//html/Towertalk/2001-03/msg00046.html (11,258 bytes)
78. [TowerTalk] Coax Rating (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 2 Mar 2001 15:23:42 +0100; Hi Gary, I didn't guess, as well as I don't take "as is" a claimed number. I prudentially estimated a reasonable breakdown voltage taking into account cable dimensions, dielectric thickness and the d; /archives//html/Towertalk/2001-03/msg00054.html (13,959 bytes)
79. [TowerTalk] coax rating (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 2 Mar 2001 17:00:59 +0100; Hi Dan, generally it's like that, at least at low HF where ohmic losses are dominant over the dielectric losses. The stand-off voltage of air corresponds more or less to 50 volts per mil.(mil=.001"); /archives//html/Towertalk/2001-03/msg00068.html (9,011 bytes)
80. [TowerTalk] 20 Meter (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Mon, 5 Mar 2001 20:24:56 +0100; I had to design an antenna with similar boomlenght than a 205 and I found best to slightly lenghten the boom from 10.4 m to 10.8 m developing a 5 elements OWA with a direct 50 Ohms feed point. Any at; /archives//html/Towertalk/2001-03/msg00107.html (10,814 bytes)

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