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81. [TenTec] Rock-bound & snivlin' (was 60M) (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sun May 18 20:57:50 2003; Without military or government communications experience, the assignment of frequency by center of the channel is foreign to amateur radio. What these mean is that we will be running SSB with the car; /archives//html/TenTec/2003-05/msg00641.html (7,833 bytes)
82. [TenTec] Quietness/Apparent Sensitivity (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon May 19 23:11:22 2003; There is much value in the receiver that can hear 20 or 30 dB better than the AVERAGE ambient noise level. You say it "hovers" and it does exactly that but noise varies. Sometimes it gets quieter, so; /archives//html/TenTec/2003-05/msg00693.html (8,539 bytes)
83. [TenTec] DC Power Supply Backup (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Wed May 21 22:49:54 2003; Its more likely that the crowbar would fry than the battery. A good battery can deliver a couple kiloamps short circuit current and the crowbar SCR probably will melt at that current. Then the batter; /archives//html/TenTec/2003-05/msg00803.html (8,445 bytes)
84. [TenTec] Power Supply Damage Control (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Thu May 22 13:32:22 2003; Most times, Astrons use the ancient LM-723 voltage regulator chip. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only.; /archives//html/TenTec/2003-05/msg00835.html (7,398 bytes)
85. [TenTec] INRAD Filter Question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Fri May 23 13:31:08 2003; If anything its the other way around. Steeper skirts and squarer passband corners mean more ringing, and so the Inrad should ring more than the TT. 73, Jerry, K0CQ -- Entire content copyright Dr. Ger; /archives//html/TenTec/2003-05/msg00915.html (7,852 bytes)
86. [TenTec] INRAD Filter Question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Fri May 23 17:57:15 2003; Ringing may depend on the CW frequency as it passes through the filter. In the center it likely will ring the least, near the passband corners where the phase delay changes most rapidly, it will prob; /archives//html/TenTec/2003-05/msg00939.html (11,514 bytes)
87. [TenTec] INRAD Filter Question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Fri May 23 19:15:28 2003; Lattice filters tend to offer very good symmetry with ringing and steep skirts. Ladder filters are less symmetrical the wider the bandwidth. Its inherent in the ladder network to be asymmetrical. 73,; /archives//html/TenTec/2003-05/msg00947.html (8,916 bytes)
88. [TenTec] INRAD Filter Question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sat May 24 11:00:06 2003; Those filter plots might be part of a review of vintage TT radios without bandpass tuning, maybe Triton, for sure before Corsair. Might be in that vintage manual. Measuring in the vintage single conv; /archives//html/TenTec/2003-05/msg00961.html (9,138 bytes)
89. [TenTec] INRAD Filter Question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sun May 25 18:42:56 2003; Time response IS very important in the REAL world where switch clicks, lightning static, and power line noise accompanies the desired signals. Its not all about separating bandwidth limited signals (; /archives//html/TenTec/2003-05/msg00994.html (9,773 bytes)
90. [TenTec] INRAD Filter Question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sun May 25 21:53:22 2003; The mechanical filters Collins has supplied for amateur radio equipment are very poor in static. I'm going to gaussian or bessel in my next home built radio. The mechanical and lattice crystal filter; /archives//html/TenTec/2003-05/msg01002.html (8,891 bytes)
91. [TenTec] Omni "C" readout (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Wed May 28 13:48:09 2003; That connector movement will be more effective if a quarter drop of DeoXit from Caig Labs is applied to each contact. Don't spray, use the dropper bottle and the tiniest amount on each connection. 73; /archives//html/TenTec/2003-05/msg01083.html (7,028 bytes)
92. [TenTec] an antenna question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Wed Apr 2 13:32:54 2003; Probably will work (as in tune and radiate), but you will have RF on the outside of the coax because the none resonant near 1/2 wave radials won't act like a ground plane. 73, Jerry, K0CQ -- Entire c; /archives//html/TenTec/2003-04/msg00039.html (7,748 bytes)
93. [TenTec] Old Modes never die... they just get soundcard support! (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Fri Apr 4 16:04:53 2003; RTTY accomplished in the old fashioned ways with TTY machine or computer in terminal mode and a dedicated TU (terminal unit) are simplistic compared to the wheedles and whistles of the many alternati; /archives//html/TenTec/2003-04/msg00137.html (11,550 bytes)
94. [TenTec] Need 7417 Chip (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sun Apr 13 23:13:50 2003; In the latest Mouser catalog. 512-DM7417N (dip package) 90 cents. In Digikey, the same part DM7417N-ND is 88 cents. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engin; /archives//html/TenTec/2003-04/msg00334.html (7,023 bytes)
95. [TenTec] Ten Tec vs. Inrad 9 MHz Filters (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue Apr 15 16:13:06 2003; In my opinion, the relatively gentle slopes and the rounded shoulders of the standard TT filters are major secrets to the great performance of TT receivers under adverse conditions. True, the gentle; /archives//html/TenTec/2003-04/msg00380.html (8,669 bytes)
96. [TenTec] Ten Tec vs. Inrad 9 MHz Filters (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue Apr 15 20:34:03 2003; For sure, the fewer ringing artifacts the roofing filter adds, the easier it is on the DSP. It is possible in DSP to remove those artifacts (e.g. correct the irregular phase response) but its more wo; /archives//html/TenTec/2003-04/msg00388.html (7,884 bytes)
97. [TenTec] Enhanced SSB (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Fri Apr 18 13:16:09 2003; SSB achieves its superior communications performance compared to double sideband AM by saving the carrier power and concentrating the transmitter power into just one sideband AND by allowing half the; /archives//html/TenTec/2003-04/msg00460.html (14,483 bytes)
98. [TenTec] Enhanced SSB (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Fri Apr 18 15:06:59 2003; If the Collins S-line you had used 3.1 KHz filters it was something changed after the factory. The S-line filter (in my 75S3B FA21... part number stands for 2.1 KHz). The Gold Dust twins might have h; /archives//html/TenTec/2003-04/msg00463.html (8,644 bytes)
99. [TenTec] Enhanced SSB (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Fri Apr 18 18:29:38 2003; Couldn't be a F455J-31 in the KWS-1. Its IF was 250 KHZ. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only.; /archives//html/TenTec/2003-04/msg00472.html (8,583 bytes)
100. [TenTec] Enhanced SSB (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sat Apr 19 11:50:43 2003; I suspect any early radio SSB was derived from wire line multiplex and probably based on LC filters at some convenient frequency like 15 or 20 KHz. Western Electric had the engineering services of th; /archives//html/TenTec/2003-04/msg00521.html (8,970 bytes)

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