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61. Re: [TenTec] FT-2000 Webpage (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 29 May 2006 13:14:31 -0500
Yes, the close in intermod happens in the first IF and the second mixer of the yaecomwood receiver. It can be prevented, at some cost, by being careful with the mixer terminations, the mixer power ca
/archives//html/TenTec/2006-05/msg00740.html (10,559 bytes)

62. Re: [TenTec] FT-2000 Webpage (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 29 May 2006 15:22:46 -0500
I'd say the roofing filter is the filter that determines the intermod bandwidth. Typically it is in the first IF, should be very close to the output of the first mixer, but there may be a very broad
/archives//html/TenTec/2006-05/msg00748.html (11,722 bytes)

63. Re: [TenTec] Roofing Filters (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 31 May 2006 15:01:30 -0500
Yes. But not very narrow. The classic receivers developed all the selectivity in the last IF through a gang of IF transformers. That allowed adjacent frequency strong signals to overload mixers (and
/archives//html/TenTec/2006-05/msg00796.html (14,659 bytes)

64. Re: [TenTec] Omni-VI+ Phase Nosie and INRAD roofing filter mod? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 01 Jun 2006 23:17:19 -0500
I'd use the Corsair II. No question, but then I don't own an Omni-VI. And I chose the Corsair II over Omni V or VI because they run CW on LSB and I intended to use the Tentec as an IF radio with tran
/archives//html/TenTec/2006-06/msg00017.html (13,769 bytes)

65. Re: [TenTec] Argonaut V question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 02 Jun 2006 08:00:36 -0500
A passive filter will not reintroduce hiss from the DSP. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _______________________________________________ TenTec ma
/archives//html/TenTec/2006-06/msg00027.html (8,205 bytes)

66. Re: [TenTec] Omni-VI+ Phase Noise and INRAD roofing filter mod? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 02 Jun 2006 23:10:23 -0500
The 2.5 KHz from carrier out are the frequencies of phase noise that affect the received signal directly. Further out affects unwanted signals being phase modulated to spread them into the pass band.
/archives//html/TenTec/2006-06/msg00044.html (11,309 bytes)

67. Re: [TenTec] 9420 Problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 04 Jun 2006 09:00:17 -0500
Try a resistive load of a few amps. Many switching supplies have minimum loads they will stay one with. Otherwise their minimum pulse width causes the output to go high and when it goes out of regula
/archives//html/TenTec/2006-06/msg00063.html (8,966 bytes)

68. Re: [TenTec] Just noticed ... (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Mon, 12 Jun 2006 06:45:01 -0600
All SSB radios that produce AM at low level run only 25 watts of carrier because the peak power of AM is 4 times the carrier power and the peak power capability of most radios is only 100 watts. That
/archives//html/TenTec/2006-06/msg00178.html (9,207 bytes)

69. Re: [TenTec] AM, was "Just noticed ..." (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Tue, 13 Jun 2006 06:42:16 -0600
Some SW AM Broadcasters have been running SSB AM for years. 73, Jerry, K0CQ -- End of Original Message -- _______________________________________________ TenTec mailing list TenTec@contesting.com htt
/archives//html/TenTec/2006-06/msg00221.html (12,040 bytes)

70. Re: [TenTec] AM, was "Just noticed ..." (score: 1)
Author: "geraldj" <geraldj@storm.weather.net>
Date: Tue, 13 Jun 2006 07:03:28 -0600
And you don't have the phase differences in propagation between the two side bands to sound bad at times. 73, Jerry, K0CQ -- End of Original Message -- _______________________________________________
/archives//html/TenTec/2006-06/msg00224.html (11,430 bytes)

71. Re: [TenTec] Omni 6+ load (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 14 Jun 2006 19:05:11 -0500
Don't forget that 50% efficient PA has only 10 or 12 dB gain so there has to be a 20 watt input driver drawing 1.8 amps more. Maybe it needs to peak reading instead of average or make the test on CW
/archives//html/TenTec/2006-06/msg00265.html (9,024 bytes)

72. Re: [TenTec] Using Airpax breaker (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 18 Jun 2006 19:04:10 -0500
Its NOT the motor that sets the short circuit current so much as its the power system. The motor can contribute short circuit current to a fault elsewhere for a few cycles and that contribution raise
/archives//html/TenTec/2006-06/msg00364.html (11,061 bytes)

73. Re: [TenTec] Omni 6 Opt 3: Problem on 15 and 10M band decoding (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 18 Jun 2006 19:06:54 -0500
Probably you are drawing too much current from those ports causing the driving device to overheat. Its probably an IC, but I don't know that since I don't have the schematic of the Omni 6 Opt 3. -- 7
/archives//html/TenTec/2006-06/msg00365.html (8,430 bytes)

74. Re: [TenTec] Turner M+2/U Microphone (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 18 Jun 2006 19:19:28 -0500
Try a camera store. The 675 was used in cameras and photo meters. There are silver based replacements that work fine. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engin
/archives//html/TenTec/2006-06/msg00366.html (8,094 bytes)

75. Re: [TenTec] Argonaut V CAT interfacing (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 18 Jun 2006 19:23:41 -0500
The standard 9 pin computer serial cable is pin to pin. E.g. 1 to 1, 2 to 2, etc. All we have were made far closer to you by slave labor in China. After shipping half way around the world they run as
/archives//html/TenTec/2006-06/msg00367.html (8,888 bytes)

76. Re: [TenTec] Argosy 1: birdy (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 18 Jun 2006 19:45:21 -0500
Its trivial. The PTO always tunes 5 to 5.5 MHz. Its mixed with 9 to get 14. Its mixed with appropriate crystals to convert 9 to other bands. 21.320 is four times 5.320 which is where the PTO sits to
/archives//html/TenTec/2006-06/msg00369.html (9,284 bytes)

77. Re: [TenTec] Argosy 1: birdy (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 18 Jun 2006 20:40:47 -0500
With 9 MHz IF, it takes 5 MHz to mix to get to 14 MHz. Always has been that way ever since the first phasing rig using a 5.3 - 7 command set was used for the VFO with a 9 MHz IF. I suppose with adequ
/archives//html/TenTec/2006-06/msg00371.html (8,073 bytes)

78. Re: [TenTec] Omni 6 Opt 3: Problem on 15 and 10M band decoding (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 19 Jun 2006 08:13:36 -0500
Better than a transistor for each line, you might use a logic level power MOSFET to keep the steady current zero. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer
/archives//html/TenTec/2006-06/msg00374.html (9,692 bytes)

79. Re: [TenTec] Centaur cooling mod for lower noise? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 22 Jun 2006 10:25:33 -0500
Its hard to quiet a siren (where the fan blades chop off the air flow through holes), but maybe if the grill was removed and a few feet of 4" flexible sound silencer duct was attached, it would be pa
/archives//html/TenTec/2006-06/msg00410.html (9,184 bytes)

80. Re: [TenTec] Shure 450 Ten Tec Setup Question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 02 Jul 2006 10:05:17 -0500
There are enough wires so that the PTT return and mic return (shield) are separate and there is likely one mic wire for high impedance and one for low impedance. There might be data in some old catal
/archives//html/TenTec/2006-07/msg00019.html (8,566 bytes)

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