Mail Archive Search: <+from:btippett@alum.mit.edu>

Results:

References: [ +from:btippett@alum.mit.edu: 660 ]

Total 660 documents matching your query.

261. [TenTec] IC-7800 Expanded Test Report (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sun, 18 Jul 2004 09:48:28 -0400; Now available for ARRL members only at: http://www2.arrl.org/members-only/prodrev/pdf/lab/ic7800.pdf KC1SX added some new 1 kHz data to the QST Product Review: BDR: 95 dB (graph on page 19) IMD: 66 d; /archives//html/TenTec/2004-07/msg00533.html (7,552 bytes)
262. [TenTec] IC-7800 Expanded Test Report (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sun, 18 Jul 2004 16:55:46 -0400; Speaking of cost, for >12 dB less $$$$$, you can buy an Elecraft K2, get identical IMD and ~20 dB better BDR at 1 kHz spacings. But the K2 is not the "astonishing unparalleled ultimate" so you probab; /archives//html/TenTec/2004-07/msg00547.html (8,489 bytes)
263. [TenTec] IC-7800 Expanded Test Report (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sun, 18 Jul 2004 20:58:49 -0400; Hi Mario, Some would argue there has been little true progress in the areas you mentioned. With DDS we got generally worse phase noise performance than we had using crystal oscillators. With DSP we g; /archives//html/TenTec/2004-07/msg00561.html (9,755 bytes)
264. [TenTec] IC-7800 Expanded Test Report (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 19 Jul 2004 07:08:55 -0400; Hi Mario, trade-offs with narrow front-end crystal filters. I am surprised that purists are not buying more 200 $ crystal filters at the antenna input!? Unfortunately, as Icom, Yaesu and Inrad have a; /archives//html/TenTec/2004-07/msg00577.html (8,781 bytes)
265. [TenTec] DSP dynamic range (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 19 Jul 2004 12:50:45 -0400; have 100 dB dynamic range before the analog AGC kicks in. This is based on the 24 bit A to D conversion. It seems to me that with only two signals in testing, if the AGC is turned off then the Orion; /archives//html/TenTec/2004-07/msg00586.html (8,735 bytes)
266. [TenTec] DSP dynamic range (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 19 Jul 2004 16:35:17 -0400; Kenwood radios (maybe a very few the TS-870S). The TS-850S was introduced 15 years ago in 1989, not exactly what I consider recent, and went out of production in 1996 with the introduction of the TS; /archives//html/TenTec/2004-07/msg00602.html (7,808 bytes)
267. [TenTec] IC-7800 Expanded Test Report (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 19 Jul 2004 16:44:33 -0400; Hi Mario, S56A: wide but very up-front! That wouldn't do a thing for a strong signal within the 15 kHz passband. You would still have exactly the same close-spaced IMD and BDR issues, which is the to; /archives//html/TenTec/2004-07/msg00603.html (9,071 bytes)
268. [TenTec] Re: Heil ProSet on Orion - reprise (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 23 Jul 2004 07:01:21 -0400; audio hum situation - thanks to many of you for very helpful hints. One thing I wanted to post for others who may stumble into this same situation is one of the "helpful fixes" NOT to do. Bob Heil's; /archives//html/TenTec/2004-07/msg00708.html (9,063 bytes)
269. [TenTec] Re: Heil ProSet on Orion - reprise (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 23 Jul 2004 11:14:02 -0400; shield" connection (which goes to Pin 2 on the Orion mic connector) is, I believe, how the Heil adapter is wired (with both mic shield, single wire shielded and PTT return wired together on Pin 2). T; /archives//html/TenTec/2004-07/msg00714.html (9,249 bytes)
270. [TenTec] Orion Roofing Filters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 23 Jul 2004 14:14:13 -0400; almost identical to the spectrum with the 20 kHz filter selected. I tried adjusting the 250 Hz filter centering over the entire +/- 250 Hz range and saw no change in the spectrum. Congratulations Mar; /archives//html/TenTec/2004-07/msg00721.html (7,678 bytes)
271. Re: [TenTec] Re: Heil ProSet on Orion - reprise (score: 1): Author: "SERVICE@TENTEC.COM" <service@tentec.com>(by way of Bill Tippett<btippett@alum.mit.edu>); Date: Fri, 23 Jul 2004 16:43:32 -0400; I received the following very prompt response from Paul at Ten-Tec ( service@tentec.com ): Dear Bill: Connecting pin 2 to the shell of the microphone connector will not damage the Orion, it could inc; /archives//html/TenTec/2004-07/msg00733.html (10,778 bytes)
272. [TenTec] Orion Roofing Filters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sat, 24 Jul 2004 07:08:59 -0400; "researched?" I ran a bandwidth test, using the spectrum facility in Hamscope and I can clearly see the bandwidth (Displayed as an amplitude peak) of the 250Hz filter. I can also see the 500Hz, the 1; /archives//html/TenTec/2004-07/msg00745.html (9,060 bytes)
273. [TenTec] Orion Roofing Filter Check (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 26 Jul 2004 07:11:21 -0400; I also had a problem with high insertion loss in a TT217 250 Hz filter. Mine turned out to have 8 dB more insertion loss than normal. If you have a steady signal source, and properly working filters,; /archives//html/TenTec/2004-07/msg00831.html (7,810 bytes)
274. Re: [TenTec] 500 HZ Roofing Filter Attenuation-Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 05 Aug 2004 07:41:59 -0400; Hi Toby, W4CAK: signals, signals that don' t move the meter. I worked for three hours tonight recentering both filters and think they are set OK. As I said, you will not notice it unless you compare; /archives//html/TenTec/2004-08/msg00213.html (11,243 bytes)
275. [TenTec] Orion Roofing Filter Cut In (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 05 Aug 2004 10:10:21 -0400; K4IA: filters. I believe Ten-Tec uses an algorithm to switch their roofing filters at ~75% of nominal bandwidth. Remember that the purpose of the roofing filter is to block unwanted products at the f; /archives//html/TenTec/2004-08/msg00216.html (8,372 bytes)
276. [TenTec] Roofing Filters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 05 Aug 2004 11:27:05 -0400; W4CAK: roofing filter. I will just use the 1KHZ filter from now on when trying to copy weak signals. I went to Inrad's website and did not see the 762 filter listed for sale yet. It IS for sale now b; /archives//html/TenTec/2004-08/msg00226.html (9,278 bytes)
277. [TenTec] Roofing Filters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 05 Aug 2004 11:48:15 -0400; to the 1000 for IMD at moderate spacings (down to 2-5 khz). Here are Sherwood's IMD measurements for anyone interested: IMD at 20/5/2 kHz: 1.8 KHz filter 96/95/93dB 1.0 KHz filter 96/94/93dB Sources:; /archives//html/TenTec/2004-08/msg00230.html (8,297 bytes)
278. [TenTec] Re: Roofing filters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 05 Aug 2004 11:54:01 -0400; 1.8KHz filter. Tom, I would be careful about that. I considered the same thing but Ten-Tec is routing CW signals through the 2400 Hz in transmit, and I recall they suggested caution in putting anythi; /archives//html/TenTec/2004-08/msg00231.html (7,201 bytes)
279. [TenTec] Re: Roofing filters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 05 Aug 2004 17:58:23 -0400; NQ5T: SSB at 2-3 Khz with a 1.8 Khz roofing filter inline -- that just doesn't make any sense to me at all. It's like running a Countach with a governor on the engine to keep your speed under 2000 rp; /archives//html/TenTec/2004-08/msg00241.html (8,373 bytes)
280. [TenTec] Re: Roofing filters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 05 Aug 2004 21:25:11 -0400; vacation), but generally my statement really was to say that it doesn't make sense to use a narrower roofing filter than DSP bandwidth. In general I agree...especially on SSB. However there is one ca; /archives//html/TenTec/2004-08/msg00247.html (8,924 bytes)

Current List: 261 - 280
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]