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21. Re: [TenTec] Ten-Tec amplifier vacuum relay noise (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 07 Dec 2007 14:44:07 -0800
The voltage difference is simply a different coil -- higher voltage, less current. I agree the mounting method contributes to the noise. But it doesn't bother me -- I wear headphones. :) Note that a
/archives//html/TenTec/2007-12/msg00248.html (9,767 bytes)

22. Re: [TenTec] Ten Tec 229 Tuner on 160M (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 08 Dec 2007 10:21:45 -0800
Several suggestions. First, consider a FAN dipole, which is very easy to build and works really well with coax. My 80/40 fans work well on 30M and 17M too. Second, study my material on coax chokes (c
/archives//html/TenTec/2007-12/msg00269.html (10,203 bytes)

23. Re: [TenTec] Omni VI+ receiver UHF intermod (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 13 Dec 2007 09:36:14 -0800
significant Yes. It must be remembered that 1) ANY non-linear device can do this mixing; and 2) ANY network has stray components that make it act very differently from what is expected far from its d
/archives//html/TenTec/2007-12/msg00405.html (9,607 bytes)

24. Re: [TenTec] radio remote (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 16 Dec 2007 13:08:36 -0800
That's becoming an increasingly difficult thing in vehicles these days. You may need to bond together parts of your vehicle to make the antenna work (and to get rid of noise -- most trucks I pass on
/archives//html/TenTec/2007-12/msg00547.html (8,354 bytes)

25. Re: [TenTec] Need help (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 19 Dec 2007 21:55:05 -0800
They are easy to make with standard parts and some suitably sized wire. I did that for the Hercules II I bought several years ago. The connectors are standard Molex parts, available from any of the m
/archives//html/TenTec/2007-12/msg00610.html (7,613 bytes)

26. Re: [TenTec] Fw: question Digital matching-- rig to sound card (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 21 Dec 2007 22:55:21 -0800
Most Virtually ALL audio circuits have low impedance outputs and high impedance inputs. They are INTENDED to be used without any form of "impedance matching" or loading. The concept of "impedance mat
/archives//html/TenTec/2007-12/msg00642.html (9,644 bytes)

27. Re: [TenTec] question (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 21 Dec 2007 23:01:22 -0800
Yes, this is an excellent technique, and I strongly recommend it. BTW -- the thing that is important is the having same SAFETY GROUND point, not the neutral. It is the AC voltage difference between t
/archives//html/TenTec/2007-12/msg00643.html (8,305 bytes)

28. Re: [TenTec] Fw: question Digital matching-- rig to sound card (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 22 Dec 2007 12:08:03 -0800
Right. And tranformers should not be necessary if you follow the simple and inexpensive techniques in my RFI tutorial -- bond all the gear together with big copper, plug everything into the same outl
/archives//html/TenTec/2007-12/msg00676.html (8,891 bytes)

29. Re: [TenTec] Corsair II & Titan 425 (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 30 Dec 2007 20:39:42 -0800
trigger I ran into this with FT1000MP when keying it through my Herc II. The problem is that these keying circuits are transistors, some of the transistors may not get to low enough "on" voltages, an
/archives//html/TenTec/2007-12/msg00836.html (9,363 bytes)

30. [TenTec] WTB 229 or 238 Tuner (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 02 Jan 2008 08:15:37 -0800
The subject says it all. I need another one. I'm in Santa Cruz, CA, will pay with my company check. Please contact me privately, not on the list. 73, Jim Brown K9YC __________________________________
/archives//html/TenTec/2008-01/msg00044.html (6,549 bytes)

31. Re: [TenTec] Centaur Power Cord (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 07 Jan 2008 11:26:33 -0800
That's because YOUR power system, like those in EU, is an unbalanced 230V system -- or 230-0-230 for larger loads. The North American power system is 120-0-120. Ordinary loads are unbalanced, from on
/archives//html/TenTec/2008-01/msg00131.html (10,448 bytes)

32. Re: [TenTec] STANDARDISATION OF S-METER READINGS (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 08 Jan 2008 22:34:34 -0800
Really? I doubt it. I own two TS850s and two FT1000MPs. I haven't measured the sensitivity of S9 (I simply didn't pay attention), but I looked at the value of an S-unit. In general, S8 to S9 is usual
/archives//html/TenTec/2008-01/msg00182.html (7,963 bytes)

33. Re: [TenTec] Signal Strength (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 12 Jan 2008 07:47:15 -0800
No, the input impedance is NOT irrelevant -- it loads the generator and reduces the voltage at the receiver input. The difference between a 50 ohm load and no load is 6 dB. A lower impedance than 50
/archives//html/TenTec/2008-01/msg00243.html (8,350 bytes)

34. Re: [TenTec] Headphone amp (was, Heil headphones) (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 16 Jan 2008 08:32:25 -0800
Since I've been traveling, I'm late to contribute to this thread. My RFI tutorial includes an appendix on audio interfacing, impedances, sensitivity, and so on. K4TAX is pretty much on target with hi
/archives//html/TenTec/2008-01/msg00352.html (9,472 bytes)

35. Re: [TenTec] 425 titan (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 17 Jan 2008 20:39:09 -0800
As others have suggested, be conservative. Grid current is a well known failure mode, so my absolute rule is to keep the grid current below 30 mA. Period. For RTTY, I'd run the amp around 800 watts o
/archives//html/TenTec/2008-01/msg00394.html (8,300 bytes)

36. Re: [TenTec] signal (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 19 Jan 2008 22:26:21 -0800
Don't know what it is, but remember that ham radio shares 30M with commercial users, and I think we're required to avoid QRMing them. 73, Jim K9YC _______________________________________________ TenT
/archives//html/TenTec/2008-01/msg00431.html (7,715 bytes)

37. Re: [TenTec] Antenna Tuner 238 (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 22 Jan 2008 15:45:35 -0800
The 229 and 238 (essentially the same tuner in a different color case and with their dial cords wound in the opposite directions) are really excellent tuners, and can be tuned to match almost any rea
/archives//html/TenTec/2008-01/msg00494.html (8,552 bytes)

38. [TenTec] Titan 425 Partial Schematics (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 24 Jan 2008 16:16:31 -0800
Hi Gang, I now own three of these vintage amps, and they require frequent maintenance to keep them running. Ten Tec's printed schematics are spread across a dozen sheets, and are difficult to follow.
/archives//html/TenTec/2008-01/msg00513.html (8,011 bytes)

39. [TenTec] Titan 425 Input Filter Board (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 05 Feb 2008 16:47:12 -0800
Hi Guys, I'm troubleshooting a "stuttering" keying problem on one of my 425s. I suspect a relay problem -- K3, K4, or K6. Vacuum relay is fairly new Gigavac, replaced last summer, and it's been throu
/archives//html/TenTec/2008-02/msg00116.html (8,026 bytes)

40. [TenTec] Better Bulb Life in TenTec 229, 238 Tuners (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 13 Feb 2008 17:10:39 -0800
I do several things to make these bulbs last longer and get more brightness from lower current (long life) bulbs. First, I put white tape on the inner black panel below the dial and around the bulbs
/archives//html/TenTec/2008-02/msg00177.html (7,693 bytes)

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