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Total 357 documents matching your query.

321. Re: [TenTec] Semi-conductor device (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 15 Sep 2003 21:38:33 -0500
Similar but smaller. the 1 stands for drain current in amps, the N for N type (drain positive), and the 45 stands for 450 volts. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, ele
/archives//html/TenTec/2003-09/msg00255.html (8,206 bytes)

322. Re: [TenTec] Curiosity Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 20 Sep 2003 20:23:22 -0500
There's a star wheel that a ball rides on to make the shaft position detent. Apply a dab of white grease to it to prolong its life. Then make sure the looseness isn't the knob. Tentec knobs aren't th
/archives//html/TenTec/2003-09/msg00293.html (7,572 bytes)

323. Re: [TenTec] Argonaut II backlight (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 20 Sep 2003 21:37:34 -0500
In the latest QST, All Electronics offers a luminescent strip that might be the right size for Tentecs that need a backlight. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electr
/archives//html/TenTec/2003-09/msg00297.html (7,274 bytes)

324. Re: [TenTec] Interesting problem and solution (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 22 Sep 2003 15:46:05 -0500
The coax cable passes RF to the control lines much better than the skinny audio cable. And despite the Gold may not have the shield grounded well at both ends or have enough shield braid to keep RF o
/archives//html/TenTec/2003-09/msg00330.html (7,149 bytes)

325. Re: [TenTec] BTW, Yahoo's privacy policy isn't as bad as... (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 24 Sep 2003 12:25:59 -0500
You don't have to accept or keep cookies. Gerald J. -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only. __________________________________________
/archives//html/TenTec/2003-09/msg00402.html (7,490 bytes)

326. Re: [TenTec] Missing text (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 24 Sep 2003 19:18:20 -0500
73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only. _______________________________________________ TenTec mailing list TenTec@con
/archives//html/TenTec/2003-09/msg00423.html (8,017 bytes)

327. Re: [TenTec] TenTec SCOUT feedback (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 28 Sep 2003 09:57:45 -0500
The power cord and connector of the Scout is notorious for excess voltage drop. It would lead to envelope modulation of the DC to the audio stage. 73, Jerry, K0CQ -- Entire content copyright Dr. Gera
/archives//html/TenTec/2003-09/msg00512.html (7,621 bytes)

328. Re: [TenTec] Mode Index Switch Question Corsair II (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 06 Oct 2003 14:51:27 -0500
Electroswitch. Probably type D4C0112S or D4C0112N, a single wafer switch, up to 12 positions, has the detent. Might need to check for dimensions, they have other models with different spacings for th
/archives//html/TenTec/2003-10/msg00166.html (7,629 bytes)

329. Re: [TenTec] Titan tuning drift on 160 meters (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 10 Oct 2003 21:49:04 -0500
The problem is capacitor heating and using capacitors with a large temperature coefficient. Typical of general purpose capacitors. You need NPO or COG type dielectric, which are larger and more costl
/archives//html/TenTec/2003-10/msg00326.html (9,346 bytes)

330. Re: [TenTec] rohn 25 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 18 Oct 2003 13:47:36 -0500
I just took a machinist's scale out and checked my Rohn 25. As I remembered, there are two bolts per leg, the upper bolt is 1/4-28 x 1-3/4" grade 5 hot dipped galvanized. The lower bolt is 5/16-24 x
/archives//html/TenTec/2003-10/msg00557.html (7,565 bytes)

331. Re: [TenTec] rohn 25 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 18 Oct 2003 14:01:45 -0500
There's no room for lock washers on my Rohn 25 with 1-3/4" bolts that are there. The bolt ends are flush with the tops of the nuts. Fine thread probably doesn't need lock washers because of the sprin
/archives//html/TenTec/2003-10/msg00559.html (8,202 bytes)

332. Re: [TenTec] rohn 25 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 18 Oct 2003 19:17:13 -0500
On my Rohn 25, the bolts are just 1-3/4" long and there's no room for a lock washer. Nor is there a good bearing surface on the round leg for a lock washer. Using lock washers demands bolts at least
/archives//html/TenTec/2003-10/msg00567.html (8,713 bytes)

333. Re: [TenTec] Date of manufacture (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 19 Oct 2003 21:22:39 -0500
All crystal filter Tentecs up through the Omni VI use a 9 MHz IF primarily. The 6.3 MHz IF is used ONLY on receive in Corsair (maybe Delta) and later to allow for bandpass tuning. It has absolutely n
/archives//html/TenTec/2003-10/msg00602.html (8,650 bytes)

334. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 20 Oct 2003 12:00:06 -0500
Resonant antennas are easier to feed, but not necessarily a great deal more efficient radiators than short dipoles. I've used wires as short as 80' center fed for 160M and 80M. And worked the paths I
/archives//html/TenTec/2003-10/msg00614.html (9,839 bytes)

335. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 20 Oct 2003 13:44:57 -0500
The organ pipe is definitely a resonator. Excited by an air "blast" the turbulence of the air makes broad band noise which the organ pipe filters to a pleasing tone. Conversely we are not driving the
/archives//html/TenTec/2003-10/msg00624.html (10,743 bytes)

336. Re: [TenTec] rohn 25 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 20 Oct 2003 13:46:27 -0500
Some one has drilled out some of the holes for larger bolts they had on hand... -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only. ______________
/archives//html/TenTec/2003-10/msg00625.html (8,519 bytes)

337. Re: [TenTec] rohn 25 (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 20 Oct 2003 15:31:04 -0500
The original bolts for Rohn 25 according to the NEW sections I have bought (and I bet it says so in my old Rohn catalog) are 1/4" and 5/16" bolt diameter with 7/16" and 1/2" heads. Bolts 3/8 and 7/16
/archives//html/TenTec/2003-10/msg00628.html (9,173 bytes)

338. Re: [TenTec] ~ 1/4 wave 160 doublet (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 21 Oct 2003 01:49:13 -0500
You should be able to tune it to a better SWR, perhaps more capacitor on the output, or input or some series inductance. The tuner Q will be high and the voltages significant though that is hard to p
/archives//html/TenTec/2003-10/msg00644.html (8,696 bytes)

339. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 21 Oct 2003 01:49:33 -0500
According to DL6WU and others, the driven element of a yagi only affects SWR, not pattern, so the driven element can be off resonance and still achieve the pattern, especially in a long yagi where it
/archives//html/TenTec/2003-10/msg00645.html (10,283 bytes)

340. Re: [TenTec] ~ 1/4 wave 160 doublet (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 21 Oct 2003 10:28:03 -0500
Look at the initial wave propagating out the transmission line to the antenna. Along the transmission line it radiates little because of the canceling field from the adjacent wire. Along the antenna
/archives//html/TenTec/2003-10/msg00659.html (8,974 bytes)

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