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61. Re: [TenTec] Omni C on 17m (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Sun, 17 Aug 2003 09:26:36 -0500; No, Clark, the first IF of the Corsair is NOT 6.3 MHz. That's only the Bandpass Tuning IF of the RECEIVE IF. The transmit IF is still at 9 MHz as is the first receiver IF and the product detector. Th; /archives//html/TenTec/2003-08/msg00366.html (8,949 bytes)
62. Re: [TenTec] 509 PTO how hard to rebuild is it? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Sun, 17 Aug 2003 09:26:45 -0500; The grease in the PTO is probably hardened. Tentec sells a rebuild kit for a bit of $20 that includes grease and instructions. You NEED those instructions more than the parts. If its stiff its probab; /archives//html/TenTec/2003-08/msg00367.html (8,830 bytes)
63. Re: [TenTec] Omni C on 17m (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Mon, 18 Aug 2003 21:59:02 -0500; The question to ask is:"What sideband is the normal sideband in that radio on 17m?" If its upper sideband there's a big transmit spur. If its lower sideband there's no spur. Its possible that it may; /archives//html/TenTec/2003-08/msg00400.html (9,395 bytes)
64. Re: [TenTec] Scout PTO question (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 19 Aug 2003 09:29:42 -0500; The TenTec PTO is spring loaded and the spring gets compressed as you move the slug into the coil going down in frequency. Makes it stiffer at the low end than at the high end. 73, Jerry, K0CQ -- Ent; /archives//html/TenTec/2003-08/msg00404.html (7,737 bytes)
65. Re: [TenTec] Scout PTO question (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 19 Aug 2003 09:29:48 -0500; Jumpy tuning sounds like hardened lubricant on the screw. The grounding strap should help mostly with hand capacitance effects. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, elec; /archives//html/TenTec/2003-08/msg00405.html (7,682 bytes)
66. Re: [TenTec] Omni C on 17m (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 19 Aug 2003 11:31:08 -0500; The spurs come from the second harmonic of the LO and a little from the second harmonic of the IF. The IF is right about 9 MHz and fixed, so that spur stays on 18.0 MHz. The LO injection is 9 MHz + t; /archives//html/TenTec/2003-08/msg00410.html (8,542 bytes)
67. Re: [TenTec] Omni C on 17m (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 19 Aug 2003 15:50:05 -0500; The horse still isn't moving no matter how hard we kick! The shared crystal is for the 10 and 28 MHz bands. In the Omni C the crystal is 4 MHz to mix the 5 MHz vfo to 9 MHz where its second harmonic; /archives//html/TenTec/2003-08/msg00421.html (11,260 bytes)
68. Re: [TenTec] 3N200 (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Thu, 21 Aug 2003 10:37:27 -0500; Since double gate MOSFET transistors are no longer being made in silicon, supplying modified transistors is more than a little difficult. Seems to me that the forward transconductance of 10 to 15 mil; /archives//html/TenTec/2003-08/msg00455.html (8,138 bytes)
69. Re: [TenTec] Century/21 Model 574 receiving what's not there? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Thu, 21 Aug 2003 11:25:44 -0500; Tighten the PC board mounting screws. Could be bad grounds from loose screws where the plastic has flowed under pressure. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical; /archives//html/TenTec/2003-08/msg00457.html (7,930 bytes)
70. Re: [TenTec] AMP Question (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Thu, 21 Aug 2003 16:11:13 -0500; Have you tuned for maximum out or for plate and grid currents? The plate and grid meters of a grounded grid amplifier can mislead you a great deal when tuning. Its far more effective to tune for maxi; /archives//html/TenTec/2003-08/msg00466.html (9,078 bytes)
71. Re: [TenTec] AMP Question (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Thu, 21 Aug 2003 17:58:20 -0500; If there's more plate color there's more plate dissipation. Less output, or more plate input. As if the load Z to the tubes isn't the same on 40 as it is on the lower bands. The tubes do have some in; /archives//html/TenTec/2003-08/msg00469.html (8,234 bytes)
72. Re: [TenTec] Titan 425 insight needed (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Fri, 22 Aug 2003 11:39:02 -0500; There are bolts through the laminations on the transformer. Tighten them, they should reduce the hum. Some transformer cores are destined to hum because at high flux densities, the iron changes size; /archives//html/TenTec/2003-08/msg00490.html (8,790 bytes)
73. Re: [TenTec] Titan 425 insight needed (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Fri, 22 Aug 2003 21:17:35 -0500; The tape wound cores held with band straps do run a high flux density and do have magnetostriction. A little isolation by rubber insulators at the mounts may help quieten it. Its not faulty, its just; /archives//html/TenTec/2003-08/msg00503.html (8,282 bytes)
74. Re: [TenTec] Titan 425 insight needed (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Sat, 23 Aug 2003 09:19:01 -0500; What the coax probably does is to supply the input C for to make an L network in the PA into a PI. The L network leaves more mismatch while the 29 pf per foot of the coax contributes to the match. Ad; /archives//html/TenTec/2003-08/msg00512.html (8,835 bytes)
75. Re: [TenTec] Paragon II Info Request (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Wed, 27 Aug 2003 13:12:49 -0500; Probably for mixer balance, maybe to set the oscillator level for adcquate output with minimum spurious outputs. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer; /archives//html/TenTec/2003-08/msg00592.html (7,053 bytes)
76. Re: [TenTec] 6N2 questions (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 01 Jul 2003 10:48:10 -0500; Audio cutting out on FM is often a sign of the receiver squelch being set too tight when the repeater has a little bit hot audio. Like the local 147.240 repeater here. 73, Jerry, K0CQ -- Entire conte; /archives//html/TenTec/2003-07/msg00013.html (7,601 bytes)
77. Re: [TenTec] T tuner (transmatch) losses? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 01 Jul 2003 21:20:39 -0500; 250 watts INPUT of AM might produce as much as 200 watts of carrier with modulation to 800 watts on peaks. 1 KW input AM might produce as much as 750 watts of carrier (unless the modulated stage was; /archives//html/TenTec/2003-07/msg00055.html (10,828 bytes)
78. Re: [TenTec] T tuner (transmatch) losses? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Wed, 02 Jul 2003 02:04:44 -0500; So long as the balun transformer is not considered to be bothered by core saturation and hasn't stray c and leakage inductance (e.g. theoretically perfect, not real world) it makes little difference; /archives//html/TenTec/2003-07/msg00059.html (13,039 bytes)
79. Re: [TenTec] Corsair II f.p. meter continued + other fixes (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Wed, 02 Jul 2003 10:43:44 -0500; There are no TR relay contacts in the Corsair... Its diode switched. The intermittent receive often comes from the separate receive antenna switch on the back panel. Work in a half drop of DeoxIt to; /archives//html/TenTec/2003-07/msg00065.html (9,122 bytes)
80. Re: [TenTec] Corsair II f.p. meter continued + other fixes (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Wed, 02 Jul 2003 12:02:58 -0500; Its really hard to clean grease off the thread through the pistol with the PTO shaft assembled. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by; /archives//html/TenTec/2003-07/msg00069.html (9,334 bytes)

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