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Total 79 documents matching your query.

1. [TenTec] Jupiter Bashing/eHam Reviews (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 1 May 2002 09:10:40 -0400
It's unfortunate that we have decided the lack of useful data somehow means all data is useless, and that many have concluded measurements are meaningless. Part of this is because some parameters ar
/archives//html/TenTec/2002-05/msg00001.html (8,972 bytes)

2. [TenTec] meaningful test results (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 2 May 2002 06:07:38 -0400
The important thing to remember is ARRL testing is getting better, and they are willing to improve it even more IF we can give them reasons for changes. Even a year ago, they measured and published
/archives//html/TenTec/2002-05/msg00031.html (9,837 bytes)

3. [TenTec] what is "quiet"? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 3 Apr 2002 05:47:28 -0500
One problem with comparing things is many of the effects are subjective, like "fatigue". One person might be bothered by something that won't bother another person at all. The other major problem is
/archives//html/TenTec/2002-04/msg00115.html (11,333 bytes)

4. [TenTec] what is "quiet"? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 3 Apr 2002 07:40:31 -0500
If I knew of a good receiver or transceiver I'd go out and buy a few today for myself. 73, Tom W8JI W8JI@contesting.com
/archives//html/TenTec/2002-04/msg00117.html (9,029 bytes)

5. [TenTec] what is "quiet"? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 4 Apr 2002 07:04:06 -0500
Yes, but they have almost entirely new circuitry, from mixers to audio. Stock they need a whole lot of work, they really aren't as good as many other newer receivers. Rebuilt with solid-state compon
/archives//html/TenTec/2002-04/msg00145.html (9,675 bytes)

6. [TenTec] what is "quiet"? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 4 Apr 2002 07:04:06 -0500
While I am not a "fan" of needless mixers, I think we might be encouraging mixerism. For example, all of the annoying hiss in FT1000's comes from a single IF amplifier stage just after the last narr
/archives//html/TenTec/2002-04/msg00146.html (9,396 bytes)

7. [TenTec] Guidance on Linear Amplifier Choice (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sat, 6 Apr 2002 05:41:44 -0500
Not only that, the transmitted signal is much cleaner with triodes despite all the tube marketing hoopla about how good "modern tetrodes" are. 3CX1200's have about the longest service life of any tu
/archives//html/TenTec/2002-04/msg00186.html (8,141 bytes)

8. [TenTec] ARRL reviews (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 12 Apr 2002 07:41:21 -0400
Speaking as someone who designs products, complaints are the single most important mechanism in learning what people actually desire and finding actual design problems. Without complaints about pane
/archives//html/TenTec/2002-04/msg00378.html (8,652 bytes)

9. [TenTec] BNC vs UHF connectors for HF 100w use (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 12 Apr 2002 10:10:55 -0400
A BNC male will plug into a 50 ohm N female with a good fit, if you remove the bayonet from the BNC. The 50 ohm N will plug into a BNC female with no changes. All of the internal dimensions are very
/archives//html/TenTec/2002-04/msg00381.html (10,176 bytes)

10. [TenTec] ARRL Reviews 746PRO (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 12 Apr 2002 21:28:29 -0400
Most important, keep in mind that is the ARRL's dB below PEP measurement that makes everything look 6dB better than the standard method. On the negative side, Texas Star CB amplifiers (with class C
/archives//html/TenTec/2002-04/msg00396.html (8,267 bytes)

11. [TenTec] OMNI VI Transmit IMD (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 14 Apr 2002 14:37:00 -0400
The final amplifier is a very small part of the system. In my IC- 751A's, most of the distortion comes from the driver transistors. In my FT1000D, most of the transmitter composite noise and a notic
/archives//html/TenTec/2002-04/msg00440.html (12,161 bytes)

12. [TenTec] OMNI VI Transmit IMD [6+] (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 14 Apr 2002 15:30:35 -0400
The real problem is we don't have a consumer reports to look at! We only have QST, and they sure aren't nearly as thorough. The automotive equivalent of the modern rig problems we are discussing are
/archives//html/TenTec/2002-04/msg00441.html (10,264 bytes)

13. [TenTec] Sidetone revisited (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 14 Apr 2002 22:49:48 -0400
I added bypass to the 784 DSP for transmit so you don't have to filter the sidetone, but of course you don't have to use the bypass feature on the amplifier/radio keying line. It is a real DSP syste
/archives//html/TenTec/2002-04/msg00449.html (8,129 bytes)

14. [TenTec] OMNI VI Transmit IMD [6+] (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 14 Apr 2002 22:49:49 -0400
/archives//html/TenTec/2002-04/msg00450.html (9,000 bytes)

15. [TenTec] OMNI VI Transmit IMD [6+] (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 14 Apr 2002 22:49:50 -0400
The ARRL lab is actually almost too immune to external feedback of any type. People aren't correct in saying they bend to manufacturer's will, so far as test results go. While I don't think the meth
/archives//html/TenTec/2002-04/msg00451.html (10,184 bytes)

16. [TenTec] cone Antenna PHOTO of how to wind them which band? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 17 Apr 2002 08:36:13 -0400
Antennas radiation is directly tied to ampere-feet of linear distance, nothing else. EM radiation occurs because of charge acceleration, nothing else. 200 feet of wire in a ten-foot physical length
/archives//html/TenTec/2002-04/msg00513.html (9,962 bytes)

17. [TenTec] Clicking noise in Jupiter rx audio (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 17 Apr 2002 08:36:14 -0400
The only time a line does not radiate is when the line carries exactly equal and exactly out-of-phase currents. That also assumes conductor spacing is infinitely small, or the line is twisted at dis
/archives//html/TenTec/2002-04/msg00514.html (7,801 bytes)

18. [TenTec] OMNI VI Transmit IMD (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 18 Apr 2002 08:04:40 -0400
Geesh, it sounds like we are tying to get -80dB IM3 performance. That simply isn't the case! A zero-bias class-C amplifier can do almost as well as some modern radios for IM3 performance. Is it real
/archives//html/TenTec/2002-04/msg00545.html (10,007 bytes)

19. [TenTec] cone Antenna PHOTO of how to wind them which band? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 18 Apr 2002 08:04:41 -0400
Hi Stuart, Capture area or effective aperture is not directly related to physical size, even though that is a popular misconception used to tout physically large antennas. Capture area relates direct
/archives//html/TenTec/2002-04/msg00546.html (9,918 bytes)

20. [TenTec] OMNI VI Transmit IMD (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 19 Apr 2002 11:04:19 -0400
My main point is that very sloppy amplifier designs can make IM3 specs close to what some modern radio's produce. Surely designers can do better than they are! -35dB referenced to a single tone would
/archives//html/TenTec/2002-04/msg00561.html (9,424 bytes)


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