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Total 357 documents matching your query.

301. Re: [TenTec] Protect your rigs. (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 13 Mar 2002 11:46:40 -0600
Once hit, the push to get up at any time of the night is great. Greater the greater the damage that first time. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by perm
/archives//html/TenTec/2002-03/msg00562.html (7,719 bytes)

302. Re: [TenTec] KB7OEX: a big plus favoring ORION (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 14 Mar 2002 11:33:56 -0600
Actually the two TenTec Corsairs did a decent job of getting the selectivity close to the antenna. The RF stage is a bipolar power transistor with RF feedback (the Anzac circuit), with a hefty double
/archives//html/TenTec/2002-03/msg00594.html (11,479 bytes)

303. Re: [TenTec] KB7OEX: a big plus favoring ORION (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 14 Mar 2002 23:33:52 -0600
A DSP filter can have very linear phase response across the pass band. My DSP-59+ handles 20 wpm CW down to 50 Hz bandwidth without too much damage or ringing. The phase response is a design variable
/archives//html/TenTec/2002-03/msg00615.html (11,482 bytes)

304. Re: [TenTec] Orion / SO2R Definition (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 14 Mar 2002 23:37:51 -0600
Art Collins' description of the next ham rig after the S-Line in about 1964 was networked with a small control box sending serial controls to a remotely mounted computer controlled radio. As far as I
/archives//html/TenTec/2002-03/msg00616.html (8,116 bytes)

305. Re: [TenTec] Orion / SO2R Definition (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 15 Mar 2002 10:54:53 -0600
I don't know much about the computer. I thought it was a little successful. Art was the problem that did in the company. He ran the company as if it was still in his garage even though it had 20,000
/archives//html/TenTec/2002-03/msg00624.html (8,798 bytes)

306. Re: [TenTec] 4CX1600B (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 27 Mar 2002 11:42:54 -0600
Last I looked RF parts sold 4CX1600B, has that changed? And other venders of Russian tubes tend to have them. Look for Svetlana or 4CX1500B. Google turned up: http://www.hfpower.com/_disc2/00000075.h
/archives//html/TenTec/2002-03/msg00890.html (8,935 bytes)

307. Re: [TenTec] Model 249 Noise Blanker (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 27 Mar 2002 22:58:09 -0600
Side of cereal box. Single sided blank PC board with the copper away from the blanker board. Hobby shop polystyrene sheet. Poster card stock. The paper items would be improved by a few coats of clear
/archives//html/TenTec/2002-03/msg00922.html (7,387 bytes)

308. Re: [TenTec] which side (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 28 Mar 2002 16:39:25 -0600
Better yet use a 12 volt transformer, schottky (or synchronous) rectifiers, and MOSFETs for the regulators and then you don't need a crowbar because the unregulated voltage is only 16 volts. 15 amp f
/archives//html/TenTec/2002-03/msg00946.html (8,489 bytes)

309. Re: [TenTec] RE: Omni V Fm'ing (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 30 Mar 2002 11:56:10 -0600
It is possible to use regulator chips (LM2940 family) that need only a half volt head room. Later Scouts did that, I don't know about earlier ones. The frequency modulation at 12 volts is a hint that
/archives//html/TenTec/2002-03/msg00994.html (9,025 bytes)

310. Re: [TenTec] Corsair II problem (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 02 Feb 2002 09:28:19 -0600
Many times an intermittent responds to alternated heat and cold. You need a source of heat, such as a hair dryer, and a source of cold such as the product "Freeze mist". The canned cold is available
/archives//html/TenTec/2002-02/msg00055.html (7,978 bytes)

311. Re: [TenTec] Pegasus/Jupiter keying - In search of Perfect CW :-) (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 03 Feb 2002 09:44:07 -0600
I've found some signals on the air at high speeds (one was a code practice station a couple years ago) where the dots became so shortened that they disappeared. That's a problem for copying high spee
/archives//html/TenTec/2002-02/msg00084.html (9,873 bytes)

312. Re: [TenTec] Using Manual Ant Tuner With Pegasus (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 04 Feb 2002 22:27:07 -0600
The safest way to tune a tuner is with a Tuner Tuner from MFJ or the place that originated the noise bridge. Its a fixed tuned noise bridge with a switch to bypass it for transmitting. 73, Jerry, K0C
/archives//html/TenTec/2002-02/msg00108.html (8,379 bytes)

313. Re: [TenTec] More on Keying Waveshapes (long) (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 07 Feb 2002 10:50:56 -0600
When you say "raised sine" function, you mean sine squared. That's always 0 or positive, and so has no zero crossings at has a smooth transition from constant value 0 to constant value 1.0000 through
/archives//html/TenTec/2002-02/msg00168.html (7,915 bytes)

314. Re: [TenTec] [OT] wireless paddles? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 11 Feb 2002 22:01:31 -0600
You could use a cordless two button mouse. Wire the paddles in place of the two buttons. Interface the button outputs of the mouse station to the keyer. 73, Jerry, K0CQ -- Entire content copyright Dr
/archives//html/TenTec/2002-02/msg00221.html (7,491 bytes)

315. Re: [TenTec] OMNI VI "click/chirp" (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 17 Feb 2002 10:03:56 -0600
Reading the 1999 ARRL Handbook description of internal timing I see some explanation for a possible chirp and some solutions. The handbook says that at key closure, the processor signals the synthesi
/archives//html/TenTec/2002-02/msg00281.html (10,830 bytes)

316. Re: [TenTec] OMNI VI "click/chirp" (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 17 Feb 2002 11:01:52 -0600
I suspect a few milliseconds delay on the make, shorter than the 5 milliseconds rise and fall won't adversely affect weight significantly. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Jo
/archives//html/TenTec/2002-02/msg00284.html (8,038 bytes)

317. Re: [TenTec] Digital Speech Processing & Pegasus (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 19 Feb 2002 09:31:41 -0600
Clipped audio converted to SSB RF has enormous amplitude spikes. That makes audio clipping and audio compression work poorly for enhancing SSB transmitter output. The whole reason for any compression
/archives//html/TenTec/2002-02/msg00312.html (10,772 bytes)

318. Re: [TenTec] Digital Speech Processing & Pegasus (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 19 Feb 2002 13:36:35 -0600
Its the corner in the derivative spectrum but its the flattening of the pseudo sine wave that adds harmonics. Remember a sine wave has no harmonics, but a very clipped sine wave is a square wave and
/archives//html/TenTec/2002-02/msg00314.html (14,289 bytes)

319. Re: [TenTec] Digital Speech Processing & Pegasus (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 19 Feb 2002 21:51:27 -0600
My experiences with the Langevin clippers were in 1963-1965 and the product was quite experienced then. At that time I don't think domestic broadcasters were using it because Leroy May, chief enginee
/archives//html/TenTec/2002-02/msg00323.html (9,924 bytes)

320. Re: [TenTec] Centaur (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 20 Feb 2002 12:57:06 -0600
Try tuning for maximum out, not for plate and grid currents. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.
/archives//html/TenTec/2002-02/msg00329.html (7,866 bytes)

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