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141. [TenTec] Roof filters (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 15 Mar 2006 09:45:20 -0500; YT1NT replied: I finally figured out what is going on. Orion always automatically centers the passband of the roofing filter selected and also automatically truncates any response below 0 Hz. If you; /archives//html/TenTec/2006-03/msg00722.html (7,556 bytes)
142. [TenTec] Roof filters (N4PY and KC9CDT) (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 15 Mar 2006 10:59:15 -0500; N4PY: Carl, this is why I always set DSP = 6000 when checking roofing filters, so that it does not interfere with the upper edge of the roofing filter response. And of course DSP always truncates at; /archives//html/TenTec/2006-03/msg00728.html (7,718 bytes)
143. [TenTec] Roof filters (N4PY and KC9CDT) (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 15 Mar 2006 12:16:30 -0500; KC9CDT: NQ5T: narrow the passband on the SUB, it (1) narrows from both ends or (2) narrows and shifts away from the low end at the same time or (3) something else that results in the same thing :-) I; /archives//html/TenTec/2006-03/msg00734.html (8,121 bytes)
144. [TenTec] Roof filters (N4PY and KC9CDT) (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 15 Mar 2006 12:32:35 -0500; identical and PBT works correctly on both. Well maybe not identical. Bandwidth is identical but SSB audio response is not flat according to Spectrogram. Also the audio response for Main RX is slightl; /archives//html/TenTec/2006-03/msg00736.html (7,544 bytes)
145. [TenTec] Questions about NR i.e. Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 22 Mar 2006 09:30:52 -0500; Hi Gerhard, You should first read page 45 of the Orion II Operating Manual: http://radio.tentec.com/cms-files/566_manual_release2_0106.pdf ** "DSP noise reduction in the ORION II interacts somewhat w; /archives//html/TenTec/2006-03/msg00992.html (13,977 bytes)
146. [TenTec] Questions about NR i.e. Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 23 Mar 2006 07:18:03 -0500; period between CW elements and during pauses/low level points in speech Good question Sinisa. At reasonable CW speeds, this would need to be in the order of milliseconds to quiet noise between "dit"; /archives//html/TenTec/2006-03/msg01022.html (10,126 bytes)
147. [TenTec] Questions about NR i.e. Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 23 Mar 2006 12:05:22 -0500; Sinisa replied: must be performed completely with the signal present, and not by switching the signal on and off. I agree. I meant with the signal always present and DSP BW always = 100 Hz, but with; /archives//html/TenTec/2006-03/msg01026.html (9,383 bytes)
148. [TenTec] Questions about NR i.e. Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 24 Mar 2006 07:22:48 -0500; of us see filtering /bandwidth reduction as the sole means of improving the ability to recover information from noise. Gert, I believe I said filtering / BW reduction is the way **Orion's NR** works.; /archives//html/TenTec/2006-03/msg01059.html (10,326 bytes)
149. [TenTec] Questions about NR i.e. Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 24 Mar 2006 07:59:49 -0500; there are two schools of thought about copying weak signals. I found that link: http://www.nitehawk.com/sm5bsz/weakcom.htm 73, Bill W4ZV; /archives//html/TenTec/2006-03/msg01060.html (6,909 bytes)
150. [TenTec] Questions about NR i.e. Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sat, 25 Mar 2006 09:58:29 -0500; filter scheme in that radio allows down to a 10hz bandwidth. What I have discovered is there is no ringing in a filter this narrow generated by the algorithm used in the SDR, even if the signal being; /archives//html/TenTec/2006-03/msg01097.html (9,643 bytes)
151. [TenTec] Orion II NR Performance Measurements (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sun, 26 Mar 2006 08:58:51 -0500; NQ5T: Implies a noise bandwidth of ~2400 Hz. Simply setting DSP BW = 1800 would improve S/N by 2.2 dB, and going to 1500 Hz would improve it by 3.0 dB. These DSP BW settings require PBT be set to ~20; /archives//html/TenTec/2006-03/msg01131.html (7,824 bytes)
152. [TenTec] Questions about NR i.e. Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sun, 26 Mar 2006 09:12:50 -0500; K0CQ: Butterworth filter will take at least 5 times the speed of a square cornered filter and a Bessel will do better than that. The DSP filters in common use do far better than similar analog filter; /archives//html/TenTec/2006-03/msg01133.html (9,123 bytes)
153. [TenTec] Orion II NR Performance Measurements (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sun, 26 Mar 2006 11:38:25 -0500; NQ5T: anyway) the AGC threshold, it is true that when NR is turned on the radio gets quiet. Unfortunately, the signal level decreases right along with the noise level. Yes, which is exactly why we ne; /archives//html/TenTec/2006-03/msg01145.html (8,563 bytes)
154. [TenTec] Questions about NR i.e. Orion (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sun, 26 Mar 2006 19:19:58 -0500; They are 60hz filters. This makes sense Lee. 60 Hz BW is reasonable since clean CW at ~13 WPM should occupy close to ~30 Hz BW; twice that BW would allow faster speeds. The broad shape factor also he; /archives//html/TenTec/2006-03/msg01176.html (9,225 bytes)
155. [TenTec] Pro 3 and 7000 Tests by Sherwood (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 28 Mar 2006 07:00:08 -0500; FYI Sherwood recently added data for the IC-756 Pro III and IC-7000 to his receiver performance test data table: http://www.sherweng.com/table.html I suspect Orion II may be coming soon. 73, Bill W4Z; /archives//html/TenTec/2006-03/msg01245.html (7,503 bytes)
156. [TenTec] Orion Aux Audio output (solution) (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 28 Mar 2006 14:26:30 -0500; K4IA: the AUX I/O jack. Little did I know one size fits all and how can you tell when you are reaching behind a radio just praying you can get the plug aligned so it will fit in? I may put a piece of; /archives//html/TenTec/2006-03/msg01261.html (7,298 bytes)
157. [TenTec] Original Orion FW 2.x Upgrades (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 31 Mar 2006 13:04:56 -0500; there 2.0 a the old AC5AA: are working to keep the original Orion on the upgrade path at least for the near future? Because some have nothing better to do with their time than publicly whine. Good g; /archives//html/TenTec/2006-03/msg01351.html (7,810 bytes)
158. [TenTec] The ORION II sure makes me happy (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 31 Mar 2006 20:14:13 -0500; HI Dan, heard a top driver cursing and swearing about some archane technical issue with the car to one of the engineers. I remember thinking, "wow he's in first place, going almost 200mph and he's bi; /archives//html/TenTec/2006-03/msg01370.html (7,824 bytes)
159. [TenTec] Kudos ARRL! (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 08 Feb 2006 08:56:43 -0500; I just noticed ARRL's review of the Yaesu FT9000 Contest in the March 2006 QST: http://www.arrl.org/members-only/prodrev/pdf/pr0603.pdf There have been two very significant changes made in ARRL's dat; /archives//html/TenTec/2006-02/msg00254.html (7,743 bytes)
160. [TenTec] S-meter and RF Gain (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 09 Feb 2006 12:48:51 -0500; W4CAK: working like it does in the foreign imports. The lower the RF gain the higher the s meter will be stuck. Toby, you mean you don't like Collins,Hammarlund, Hallicrafters, Drake, etc? It's how S; /archives//html/TenTec/2006-02/msg00279.html (9,074 bytes)

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