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101. Re: [TenTec] Future TT projects (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 02 Jun 2003 19:33:24 -0500
In some catalogs, IBM supplies as wide a variety of PC and laptop PC hardware as Dell or Compaq and at quite competitive prices. They may not be out front, but they are sure not a trivial player in t
/archives//html/TenTec/2003-06/msg00088.html (9,378 bytes)

102. Re: [TenTec] Some Observations on Orion Stability/Calibration (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 02 Jun 2003 19:33:38 -0500
I read a compendium on frequency measurement, probably put out by the IRE or IEEE, likely 25 years ago. I think its still in a certain pile but I don't want to disturb that pile at the moment. Its no
/archives//html/TenTec/2003-06/msg00089.html (14,282 bytes)

103. Re: [TenTec] Some Observations on Orion Stability/Calibration (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 04 Jun 2003 16:03:51 -0500
Ground wave at HF is as good for frequency stability as world wide propagation on 20 and 60 KHz. In fact the transmitter frequencies of WWV on HF are monitored at Boulder some miles from Ft. Collins.
/archives//html/TenTec/2003-06/msg00182.html (10,420 bytes)

104. Re: [TenTec] Re: Orion rf gain and inherent noise (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 07 Jun 2003 22:11:36 -0500
There is a certain level on noise from the A/D even with no signal and a certain level of noise from the output D/A. Each is better the more bits. Sometimes tagged "quantization noise." 73, JErry, K0
/archives//html/TenTec/2003-06/msg00294.html (8,527 bytes)

105. Re: [TenTec] Re: Orion rf gain and inherent noise (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 08 Jun 2003 17:13:32 -0500
Quantization noise come from making analog signals into discrete digital steps. I don't think its a problem of noise from hot circuits that could be helped by cooling. Besides cooling works best when
/archives//html/TenTec/2003-06/msg00317.html (8,843 bytes)

106. Re: [TenTec] Need Help. (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 12 Jun 2003 08:09:18 -0500
Could be the antenna no longer is tunable on 20m. The tuner can't tune every length of wire. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by pe
/archives//html/TenTec/2003-06/msg00416.html (7,283 bytes)

107. Re: [TenTec] Ten-Tec 2591 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 14 Jun 2003 20:57:01 -0500
Digi-Key makes custom battery assemblies that you can install in the Ten-Tec case. Likely they originally were 450 mah AA nicads in a group of 6 or 8, mostly like two layers of 3 or 4 all series conn
/archives//html/TenTec/2003-06/msg00480.html (7,629 bytes)

108. Re: [TenTec] Omni6+ roofing filter (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 16 Jun 2003 20:20:40 -0500
Its really NO mystery why a narrow "roofing" filter didn't help. It just means that the IMD isn't limited by the first IF and second mixer whether close in or with wide spread signals. It means that
/archives//html/TenTec/2003-06/msg00532.html (13,276 bytes)

109. Re: [TenTec] Orion Bottom Cover (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 16 Jun 2003 20:20:44 -0500
So MAYBE one could improve the temperature stability of the TCXO environment. First step, surround the TCXO with a block of Dow blue board (or white or gray). That will slow the effect environmental
/archives//html/TenTec/2003-06/msg00533.html (9,240 bytes)

110. Re: [TenTec] Omni6+ roofing filter (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 17 Jun 2003 08:40:03 -0500
One other reason for roofing filter bandwidth is the noise blanker. Narrower and/or steeper skirted broadens out the noise impulses making them harder to detect and strip out. 73, Jerry, K0CQ -- Enti
/archives//html/TenTec/2003-06/msg00538.html (8,630 bytes)

111. Re: [TenTec] Omni V & VI MIXER Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 24 Jun 2003 20:23:08 -0500
23 dBm means 23 dBm LO power. 200 milliwatts. at least the 17 dBm mixer only needs 50 milliwatts. That would be the biggest problem with using the higher power mixer. The next problem probably is tha
/archives//html/TenTec/2003-06/msg00747.html (7,892 bytes)

112. Re: [TenTec] Omni V & VI MIXER Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 24 Jun 2003 20:51:00 -0500
It very well could be that the mixer is already running at more than nameplate local oscillator power. Hence the heating. I won't be jacking up the power to that mixer because I don't like some detai
/archives//html/TenTec/2003-06/msg00753.html (7,736 bytes)

113. Re: [TenTec] Orion K6SE A/B tests etc. (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 26 Jun 2003 20:52:24 -0500
I MUST grumble. The 6BE6 is a multi grid mixer, never an RF stage, and never a great mixer, too much noise. The 6BA6, 6EJ7, and 6DC6 were RF stages in HF radios. 73, Jerry, K0CQ -- Entire content cop
/archives//html/TenTec/2003-06/msg00811.html (7,525 bytes)

114. Re: [TenTec] Hello Orion Users (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 06 May 2003 13:45:46 -0500
BUT!!! since the 10 KHz signal coming to the DSP in the Orian is MODULATED RF, you probably can't copy the voice (might copy the make break CW signals) because your ear can't do the frequency transla
/archives//html/TenTec/2003-05/msg00135.html (9,888 bytes)

115. Re: [TenTec] Curious (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 07 May 2003 09:14:56 -0500
You get many solutions because there ARE many workable solutions. Including a simple few hundred ohm series resistor while connected to the speaker circuit to cut the headphone level. I would say tha
/archives//html/TenTec/2003-05/msg00162.html (9,480 bytes)

116. Re: [TenTec] sources for good used TT gear (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 07 May 2003 09:18:32 -0500
Check dealers. Burghardt often takes in TT gear in trade, The Ham Station had an Omni V and a VI+ on their used list yesterday and they have a 10 day no questions return and 30 day equipment return.
/archives//html/TenTec/2003-05/msg00163.html (7,450 bytes)

117. Re: [TenTec] OMNI D hand capacitance effects on tuning (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 08 May 2003 08:58:50 -0500
Ground the PTO shaft. In my Corsair II, there's a wire spring, maybe one or two turns in a flat coil and an end maybe an inch long that wipes on the PTO shaft. I'm sure Tentec put that there intentio
/archives//html/TenTec/2003-05/msg00196.html (7,981 bytes)

118. Re: [TenTec] Omni 6 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 10 May 2003 21:22:33 -0500
http://www.hamstation.com/usedham.htm http://www.burghardt-amateur.com/Burghardt/HTML/used_product_frames/used_HF_equip_frame.html I've had happy dealings with both of these small ham stores. 73, Jer
/archives//html/TenTec/2003-05/msg00262.html (8,376 bytes)

119. Re: [TenTec] Q: Triton Power Connectors P/Ns (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 11 May 2003 13:51:14 -0500
The Cinch-Jones 300 series are carried by Mouser (no minimum order), Digi-Key, and have been carried by Radio Shack. They are a relatively common and easy to find connector. I've been using them for
/archives//html/TenTec/2003-05/msg00279.html (7,675 bytes)

120. Re: [TenTec] Email "Reply to All" (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 14 May 2003 17:42:46 -0500
Sorry Don, "reply to all" gets only to the list like this. There's NOTHING to edit out. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permiss
/archives//html/TenTec/2003-05/msg00344.html (7,383 bytes)

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