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21. Re: [TenTec] Re: ~ 1/4 wave 160 doublet (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 21 Oct 2003 17:16:50 -0500
That applies here. The antenna won't work a bit better with the added feedline, just the tuner will be easier to tune. And that's why those magic lengths are no longer described in modern antenna man
/archives//html/TenTec/2003-10/msg00665.html (8,097 bytes)

22. Re: [TenTec] Latest BPL events... (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 23 Oct 2003 17:31:53 -0500
We taught the foreign power systems how to use 3 phase and we use three phase all over except for individual single phase lines to single phase customers. But when the wires are more than an antenna
/archives//html/TenTec/2003-10/msg00735.html (8,917 bytes)

23. Re: [TenTec] Latest BPL events... (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 24 Oct 2003 09:31:44 -0500
Jason W0JSB: Your residential distribution is single phase. Much of the ground wire current is in the earth. The 75 stands for 75 KVA transformer rating. The primary voltage might be 4160, might be 2
/archives//html/TenTec/2003-10/msg00749.html (10,784 bytes)

24. Re: [TenTec] Latest BPL ....power distribution for AC (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 24 Oct 2003 19:42:20 -0500
Those capacitors aren't for phase shifting to make a pseudophase, they are for power factor correction to improve the voltage regulation. Phase shifting with capacitors is very load dependent and use
/archives//html/TenTec/2003-10/msg00765.html (9,489 bytes)

25. Re: [TenTec] QRP-ifying an IC-745 and TT 1208 Transverter (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 26 Oct 2003 13:23:41 -0600
I don't know the circuit details of the TT1208 but I presume the IF port is quite similar to that of the TT1209 with the same IF port ratings. I've driven my TT1209 with a HP608F signal generator at
/archives//html/TenTec/2003-10/msg00788.html (8,016 bytes)

26. Re: [TenTec] 560 Problem (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 27 Oct 2003 21:35:54 -0600
The RF stage transistor could be bad, fried by lightning. The amplifier switching could be bad. The same components are used on all bands. You do need a schematic from the manual to find those parts
/archives//html/TenTec/2003-10/msg00819.html (7,761 bytes)

27. Re: [TenTec] 560 Problem (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 28 Oct 2003 16:44:56 -0600
There are two virtually identical stages in my Corsair II schematic. The RF stage and the first IF stage, both high dynamic range transformer feedback (Anzac patent) bipolar stages using CATV rf powe
/archives//html/TenTec/2003-10/msg00844.html (8,112 bytes)

28. Re: [TenTec] Omni 6+ / Inrad SSB mod (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 31 Oct 2003 09:43:27 -0600
What 3 kHz spacings rules. There never have been RULES about spacings on amateur bands. 3 kHz works with 2.4 and 2.1 KHz filters (2.1 was the standard Collins S-line filter, plenty good for communica
/archives//html/TenTec/2003-10/msg00891.html (8,143 bytes)

29. Re: VS: [TenTec] Orion TX Audio: Update (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 31 Oct 2003 09:43:30 -0600
Depends on whether you are trying to avoid a 50/60Hz ground loop or RF. In the ham shack where the radio filter ignores that low frequency, and there IS RF, grounding the shield at the radio end to t
/archives//html/TenTec/2003-10/msg00892.html (8,894 bytes)

30. Re: [TenTec] 3KC Spacing / K0CQ reply (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 31 Oct 2003 22:25:49 -0600
I have a home brew speaker passive filter. One choice of cutoff frequency is about 1850 Hz. Its quite useful for enhancing weak signals and hiding QRM. 2 KHz spacing works with fine radios having sup
/archives//html/TenTec/2003-10/msg00925.html (8,729 bytes)

31. 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 (7,532 bytes)

32. 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 (7,307 bytes)

33. 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 (7,612 bytes)

34. 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 (7,832 bytes)

35. 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/msg00157.html (8,097 bytes)

36. 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/msg00176.html (7,740 bytes)

37. 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/msg00178.html (7,347 bytes)

38. [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/msg00179.html (7,774 bytes)

39. 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/msg00186.html (7,250 bytes)

40. 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/msg00219.html (7,773 bytes)

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