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Total 357 documents matching your query.

301. [TenTec] Fw: Loud Hum w/Paragon I & 961 (score: 1)
Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer)
Date: Sun, 16 Sep 2001 14:30:12 -0500
You might try lowering the line voltage to the power supply. Hum is a sign of the core being run to saturation (cheap design short on core area and copper). It should get very much quieter with only
/archives//html/TenTec/2001-09/msg00148.html (7,841 bytes)

302. [TenTec] Omni V Freq. Display and Noise Blanker (score: 1)
Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer)
Date: Thu, 20 Sep 2001 10:56:07 -0500
Each band is set with a crystal and is independently adjustable. That gives the radio far less phase noise than it would have if all the offset frequencies were synthesized. Be sure to use a counter
/archives//html/TenTec/2001-09/msg00164.html (7,189 bytes)

303. [TenTec] Heath keyer questions (re: TT rigs) (score: 1)
Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer)
Date: Mon, 24 Sep 2001 09:16:41 -0500
To move the paddles closer together you might be able mount one or both on the inside of its arm. If its transistor output and set for negative keying, and the Delta is positive, the quickest mod mig
/archives//html/TenTec/2001-09/msg00180.html (7,093 bytes)

304. [TenTec] Omni-D Dial sticking? (score: 1)
Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer)
Date: Tue, 25 Sep 2001 02:32:24 -0500
WD-40 may be not the worst thing for loosening up the hardened grease, if its in the vernier, but you won't be able to spray enough from the front to loosen the grip of the slug's nut on the threads.
/archives//html/TenTec/2001-09/msg00191.html (7,322 bytes)

305. [TenTec] TT boxes (score: 1)
Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer)
Date: Fri, 28 Sep 2001 09:43:23 -0500
Tentec sells boxes. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.
/archives//html/TenTec/2001-09/msg00242.html (6,454 bytes)

306. Re: [TenTec] Titan 425 insight needed (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 22 Aug 2003 11:39:02 -0500
There are bolts through the laminations on the transformer. Tighten them, they should reduce the hum. Some transformer cores are destined to hum because at high flux densities, the iron changes size
/archives//html/TenTec/2003-08/msg00490.html (7,927 bytes)

307. Re: [TenTec] Titan 425 insight needed (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 22 Aug 2003 21:17:35 -0500
The tape wound cores held with band straps do run a high flux density and do have magnetostriction. A little isolation by rubber insulators at the mounts may help quieten it. Its not faulty, its just
/archives//html/TenTec/2003-08/msg00503.html (7,724 bytes)

308. Re: [TenTec] Titan 425 insight needed (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 23 Aug 2003 09:19:01 -0500
What the coax probably does is to supply the input C for to make an L network in the PA into a PI. The L network leaves more mismatch while the 29 pf per foot of the coax contributes to the match. Ad
/archives//html/TenTec/2003-08/msg00512.html (8,579 bytes)

309. Re: [TenTec] Paragon II Info Request (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 27 Aug 2003 13:12:49 -0500
Probably for mixer balance, maybe to set the oscillator level for adcquate output with minimum spurious outputs. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer
/archives//html/TenTec/2003-08/msg00592.html (7,258 bytes)

310. Re: [TenTec] PTO - mechanical problem. help! (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 01 Sep 2003 20:09:47 -0500
Lumpy grease on the screw? In my Corsair's PTO it tuned poorly going down compressing the spring, there was a great deal of slip in the vernier because of a deep groove worn (crooked too) by the ball
/archives//html/TenTec/2003-09/msg00025.html (7,737 bytes)

311. Re: [TenTec] Corsair Audio IC (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 02 Sep 2003 12:08:11 -0500
Its U-5 on the audio board. My manual is short the parts list page 3-34. Does anyone have that page they could scan for us to see? My guess is an LM38x, likely 380N if 14 pins for 1 watt at 12 volt s
/archives//html/TenTec/2003-09/msg00035.html (7,393 bytes)

312. Re: [TenTec] Starting up 'stored' Titan amp (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 02 Sep 2003 21:51:48 -0500
I'd rather there was a lamp, say 200 or 250 watts in series with the input to the amplifier. Then feed that with the variac and plan on several days. Raise the voltage a little and wait until the cur
/archives//html/TenTec/2003-09/msg00043.html (7,382 bytes)

313. Re: [TenTec] Frequency Knob lock for a Corsair I (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 03 Sep 2003 21:08:37 -0500
The electronic lock won't work. Its an analog PTO. It would take a mechanical shaft lock, made more complicated by the fact that the shaft for the logging dial is outside the knob shaft. You could us
/archives//html/TenTec/2003-09/msg00081.html (8,037 bytes)

314. Re: [TenTec] Help on Operation of Corsair II (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 10 Sep 2003 03:36:04 -0500
The crystal filter effective position depends on mode. Its one position different in the SSB mode than in the CW mode. On CW its one switch position closer to the SSB filter than on SSB. So on CW wit
/archives//html/TenTec/2003-09/msg00156.html (7,589 bytes)

315. Re: [TenTec] Actual TT219 250 Hz Bandwidth? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 11 Sep 2003 13:26:47 -0500
With the bandpass tuning used by Tentecs since at least the Corsair II, you can narrow any filter by sliding the 6.3 over from the 9 MHz pass band, so you can get anything you desire with the stock f
/archives//html/TenTec/2003-09/msg00175.html (7,510 bytes)

316. Re: [TenTec] Actual TT219 250 Hz Bandwidth (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 11 Sep 2003 14:32:05 -0500
I stand corrected. I didn't know there were such manuals on the unofficial Tentec pages. Made use of it immediately. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engi
/archives//html/TenTec/2003-09/msg00177.html (7,476 bytes)

317. [TenTec] Possible source of excess 75 meter noise on Corsair II. (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 11 Sep 2003 14:37:11 -0500
A day or back someone here complained about the large 75 meter noise level. While looking through my Tentec directory after loading the filter manuals, I noticed a mod from WA6NCX to cut down on the
/archives//html/TenTec/2003-09/msg00178.html (7,949 bytes)

318. Re: [TenTec] contact cleaner? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 11 Sep 2003 17:46:17 -0500
My source of DeOxit is Electronic Supply of Ames, 515-232-7020. He has a web page too. There's hardly anything useful at Radio Shack. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson
/archives//html/TenTec/2003-09/msg00185.html (7,337 bytes)

319. Re: [TenTec] Triton 540 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 13 Sep 2003 19:14:28 -0500
One easy way to quiet the relay with a clapper type of armature is to restrict the motion of the clapper. Traditionally its been done with a match stick or piece of a paper match book cover. A piece
/archives//html/TenTec/2003-09/msg00218.html (7,437 bytes)

320. Re: [TenTec] Semi-conductor device (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 15 Sep 2003 09:38:30 -0500
MTM1N45 is a power MOSFET. Fits MY power supply but probably not a tentec power suppply. N type, 150 volts 45 amps. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engin
/archives//html/TenTec/2003-09/msg00239.html (7,078 bytes)

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