Search String: Display: Description: Sort:

Results:

References: [ +from:geraldj@storm.weather.net: 1055 ]

Total 1055 documents matching your query.

81. Re: [TenTec] poor audio on OMNI-V (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 29 Mar 2009 16:31:47 -0600
10 ppm at 9 MHz is 90 Hz. I thought the object of the task was to resolve the difference between 200 and 300 Hz from the filter corner. A potential error of 90 Hz is nearly all of that. 1 ppm takes c
/archives//html/TenTec/2009-03/msg00467.html (10,375 bytes)

82. Re: [TenTec] Need advice about OVP for 262G (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 31 Mar 2009 19:48:46 -0600
Many ARRL Handbook power supply projects have included a crowbar. Typically its a large SCR connected so when triggered it shorts the supply, sometimes before the regulator. I see in the 2002 ARRL Ha
/archives//html/TenTec/2009-03/msg00496.html (8,604 bytes)

83. Re: [TenTec] G5RV (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 01 Feb 2009 11:40:26 -0600
Are you sure? Using data and formulae in the 1994 ARRL Antenna Book, I see 100' of RG213 has 0.6 dB loss at 4 MHz when matched, and 1.066 dB with a 3.6:1 SWR. 1" spaced window line has 0.027 dB (had
/archives//html/TenTec/2009-02/msg00010.html (10,884 bytes)

84. Re: [TenTec] G5RV (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 01 Feb 2009 16:30:24 -0600
I didn't use any SWR chart. I used formulae involving the matched loss and the magnitude of the mismatched reflection coefficient. The mismatched loss was greater than the matched loss. The formulae
/archives//html/TenTec/2009-02/msg00026.html (11,132 bytes)

85. Re: [TenTec] bill orr article (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 01 Feb 2009 16:35:11 -0600
I've read of an easier way to make the holes. Get a BB and a drinking straw. And its probably a good idea to wear safety glasses. Load the BB into the straw, put the straw against the glass where a h
/archives//html/TenTec/2009-02/msg00027.html (9,521 bytes)

86. Re: [TenTec] bill orr article (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 01 Feb 2009 16:42:13 -0600
Since you are tuning the balanced line, the impedance bump isn't even a theoretical problem, you just tune for the match and don't care what the feedline did. In the life of my long centerfed wire, I
/archives//html/TenTec/2009-02/msg00028.html (10,306 bytes)

87. Re: [TenTec] G5RV (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 01 Feb 2009 18:51:18 -0600
Yes, IF (and only if) you pick your point along the line for that short line you can pick a line that has lower loss. But the loss per cable length is based on the total loss of a line many quarter w
/archives//html/TenTec/2009-02/msg00031.html (12,574 bytes)

88. Re: [TenTec] Omni 6 "lights" (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 03 Feb 2009 18:02:04 -0600
Now, in preparation for the next time these events reoccur, you need to acquire a dropper bottle of Cramolin's DeoxIT, and to apply a half or quarter drop to each connector contact surface to make th
/archives//html/TenTec/2009-02/msg00074.html (8,536 bytes)

89. Re: [TenTec] Plate Voltage reading on Centurion (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 04 Feb 2009 18:29:46 -0600
On a volt meter its called a multiplier. Its not wired in shunt with the meter. High voltage has been know to cause resistors to change value. Age and humidity have often caused moderate quality resi
/archives//html/TenTec/2009-02/msg00099.html (8,387 bytes)

90. Re: [TenTec] HInts for troubleshooting an OMNI D (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 05 Feb 2009 11:15:19 -0600
I won't say it couldn't be the crystal, but I'd suspect bandswitch and cable connections before I'd suspect the crystal. A quarter drop of Cramolin DeoxIT on each can work miracles. See if just exerc
/archives//html/TenTec/2009-02/msg00106.html (7,760 bytes)

91. Re: [TenTec] Ig drift on Titan 425 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 06 Feb 2009 18:15:20 -0600
Grid current metering components can drift when heated by larger than planned grid currents. Tuning for maximum output is the best way to tune a linear, especially a grounded grid linear. It is easy
/archives//html/TenTec/2009-02/msg00131.html (9,921 bytes)

92. Re: [TenTec] OT Again: Eico 710 GDO (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 07 Feb 2009 14:40:26 -0600
That brown stuff is probably Pliobond. A rubbery contact adhesive. It holds better than tape. It may still be available, if not go to a car parts store and get a tube of 3M trim adhesive. 73, Jerry,
/archives//html/TenTec/2009-02/msg00144.html (8,836 bytes)

93. Re: [TenTec] OT Again: Eico 710 GDO (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 07 Feb 2009 20:46:24 -0600
A grid to cathode short was the most common failure for the 6AF4 family. It had tiny geometry and small spacings to oscillate up to about 850 MHz in the UHF tuner or converter. And short life from th
/archives//html/TenTec/2009-02/msg00155.html (8,779 bytes)

94. Re: [TenTec] Ig drift on amps (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Feb 2009 12:01:27 -0600
A way to look at the current in the padding capacitors is to realize that 2Kw at 50 ohms is 316 volts RMS. The reactance of a 220 pf padding capacitor at 2 MHz is 360 ohms, so the current in that pad
/archives//html/TenTec/2009-02/msg00161.html (11,506 bytes)

95. Re: [TenTec] Ig drift on amps More than you wanted to know about tuners and capacitors (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Feb 2009 12:03:49 -0600
Mouser shows a FEW NPO high voltage ceramic disks. 2KW at 50 ohms is 316 volts RMS, but using a ceramic rated at a few KV distributes the RF current into a greater volume of ceramic which should redu
/archives//html/TenTec/2009-02/msg00162.html (13,980 bytes)

96. Re: [TenTec] Ig drift on amps (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Feb 2009 15:06:42 -0600
That certainly complicates figuring the current in the padder because that design midpoint impedance could be anything between 50 ohms and the plate load impedance, though some mid value gives better
/archives//html/TenTec/2009-02/msg00165.html (10,639 bytes)

97. Re: [TenTec] Gel cells (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Feb 2009 15:38:35 -0600
Gel Cells demand current limited charging, generally to lower voltage than wet cells. The maker's web page should have an applications note and the value of the maximum charging current. Constant vo
/archives//html/TenTec/2009-02/msg00166.html (8,247 bytes)

98. Re: [TenTec] Ig drift on amps (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 08 Feb 2009 22:14:32 -0600
He was talking about the design impedance at the junction of the Pi and the L. Higher than the load Z, lower than the plate Z. 300 to 600 ohms are common values for that mid point in the output netwo
/archives//html/TenTec/2009-02/msg00170.html (10,533 bytes)

99. Re: [TenTec] Gel cells (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 10 Feb 2009 22:43:42 -0600
There is where both the current limiting and voltage limiting come in. You need to have a float voltage usually lower on a gel cell than a wet cell (the maker's specification sheet will make both lim
/archives//html/TenTec/2009-02/msg00198.html (8,807 bytes)

100. Re: [TenTec] O2 output level with PSK aux in (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 10 Feb 2009 22:57:09 -0600
You get 100 watts PSK by running 20 watts from the Orion into a 600 watt amplifier. Otherwise the intermod just kills the BAND you are on, and the other users will be wanting to shove nails into your
/archives//html/TenTec/2009-02/msg00199.html (10,465 bytes)

Current List: 81 - 100
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
This search system is powered by Namazu