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Total 357 documents matching your query.

1. Re: [TenTec] Inrad Mods/ Reply to Ken Brown (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 04 Nov 2003 14:35:15 -0600
2.8 KHz is a third wider than the 2.1 filter that came in all 100,000+ Collins S-line and a large number of KWM-2. I never noticed not copying nice audio with them though listing to very narrow FM wi
/archives//html/TenTec/2003-11/msg00085.html (9,534 bytes)

2. Re: [TenTec] Inrad Mods/ Reply to Ken Brown (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 04 Nov 2003 21:33:18 -0600
Bandpass tuning in the 75A4 was expensive to produce. The 75A4 and KWS-1 were intended only for the elite amateur, and priced accordingly. That bandpass tuning was different than the band pass tuning
/archives//html/TenTec/2003-11/msg00099.html (11,668 bytes)

3. Re: [TenTec] Inrad Mods (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 05 Nov 2003 10:50:20 -0600
Collins Yellow Book suggests that voice components above 1 kHz contribute most to intelligibility while the lower frequency components contribute most of the power. Therefore they suggest that the HF
/archives//html/TenTec/2003-11/msg00116.html (7,740 bytes)

4. Re: VS: [TenTec] Fixing a Paragon... (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 05 Nov 2003 23:17:50 -0600
As I recall reading on this list, Paragon logic boards have had a tendency to suffer from poor soldering and many miscellaneous problems have been fixed by simply manually resoldering every connectio
/archives//html/TenTec/2003-11/msg00136.html (8,322 bytes)

5. Re: [TenTec] Minimum power necessary (long) (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 06 Nov 2003 10:45:25 -0600
Yes, there are differing opinions on the required bandwidth. And indeed the required bandwidth depends on the nature of the communication AND the voice. A kid or YL is going to need more top end to b
/archives//html/TenTec/2003-11/msg00155.html (13,025 bytes)

6. Re: [TenTec] TT 1220 problem (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 11 Nov 2003 22:58:04 -0600
Sounds to me as if its a PLL loop filter problem. Check those capacitors and resistors between the phase detector, the op amp if any, and the VCO. Check board grounding also, e.g. tightness of board
/archives//html/TenTec/2003-11/msg00284.html (8,314 bytes)

7. 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/msg00161.html (7,635 bytes)

8. 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/msg00322.html (9,488 bytes)

9. 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/msg00553.html (8,438 bytes)

10. 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/msg00555.html (8,913 bytes)

11. 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/msg00563.html (8,963 bytes)

12. 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/msg00598.html (8,655 bytes)

13. 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/msg00610.html (9,864 bytes)

14. 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/msg00620.html (10,633 bytes)

15. 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/msg00621.html (8,610 bytes)

16. 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/msg00624.html (8,969 bytes)

17. 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/msg00640.html (9,962 bytes)

18. 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/msg00641.html (10,432 bytes)

19. 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/msg00655.html (10,075 bytes)

20. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 21 Oct 2003 15:29:06 -0500
DL6WU long yagis are designed to give a plain dipole driven element center Z of about 50 ohms. Makes for less loss and easier feeds. Some computer optimized (and commercial) medium length VHF yagis h
/archives//html/TenTec/2003-10/msg00660.html (11,272 bytes)

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