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1. [TenTec] ORION BCI (score: 1): Author: <wq7x@cox.net>; Date: Fri, 27 May 2005 12:39:17 -0400; I believe that ORION can be much more immune to BCI/any out of band signals than it is now. This has to be simple fix. I have connected external Attenuator and with just 6dB attenuation the BCI of S9; /archives//html/TenTec/2005-05/msg00485.html (7,994 bytes)
2. Re: [TenTec] ORION BCI (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Fri, 27 May 2005 11:56:46 -0500; Hi Mark, A couple of simple fixes, run an external tuner in front of the receiver when you are listening to SW. Construct a simple series trap tuned to the AM BC band in a shielded box. Run it across; /archives//html/TenTec/2005-05/msg00486.html (6,977 bytes)
3. Re: [TenTec] ORION BCI (score: 1): Author: <wq7x@cox.net>; Date: Fri, 27 May 2005 13:07:09 -0400; Stuart, Thanks for your response. But you are missing the point. I know how to fix the problem externally. But the question is why I don't need to do anything with the old TS930s or Elecraft K2. No p; /archives//html/TenTec/2005-05/msg00487.html (8,962 bytes)
4. Re: [TenTec] ORION BCI (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Fri, 27 May 2005 12:17:54 -0500; I always wonder if we do not ask too much; when we want a super sensitive ham receiver, then wonder why high level RF in the local vicinity bothers the set. Our antennas, if configured as tuned anten; /archives//html/TenTec/2005-05/msg00488.html (7,757 bytes)
5. Re: [TenTec] ORION BCI (score: 1): Author: <wq7x@cox.net>; Date: Fri, 27 May 2005 13:25:37 -0400; Stuart, We don't need super sensitive receiver for HF. Orion with preamp OFF and with 18dB attenuator ON is not sensitive at all. Is atually much less sensitive then TS930s with preamp ON and atenuat; /archives//html/TenTec/2005-05/msg00489.html (8,656 bytes)
6. Re: [TenTec] ORION BCI (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Fri, 27 May 2005 12:34:29 -0500; Hmm does sound like a problem, then. Other reports for over a year have generally been very complimentary of the Orion receiver including independent review by ARRL Lab. Do get with Ten Tec by phone,; /archives//html/TenTec/2005-05/msg00490.html (7,707 bytes)
7. Re: [TenTec] ORION BCI (score: 1): Author: "Thomas Jednacz" <tjednacz@ieee.org>; Date: Fri, 27 May 2005 13:41:43 -0400; Hope you find the problem and have better enjoyment of the Orion. 73, Tom, W7QF _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/m; /archives//html/TenTec/2005-05/msg00491.html (7,989 bytes)
8. Re: [TenTec] ORION BCI (score: 1): Author: "Martin, AA6E" <martin.ewing@gmail.com>; Date: Fri, 27 May 2005 14:01:51 -0400; I'm not sure what you mean by "inline". The Orion attenuator comes after the diode switching matrix and voltage limiting (+/- 5 V) diodes, some of which are being driven nonlinear IMO. If other commo; /archives//html/TenTec/2005-05/msg00492.html (9,591 bytes)
9. Re: [TenTec] ORION BCI (score: 1): Author: "Bob Henderson" <bob@cytanet.com.cy>; Date: Fri, 27 May 2005 18:08:40 -0000; Mark If your conclusion is correct Ten Tec should indeed correct the design flaw and issue an ECO but is your conclusion correct? Perhaps you have a dry joint or a bad component somewhere preceding t; /archives//html/TenTec/2005-05/msg00493.html (10,317 bytes)
10. Re: [TenTec] ORION BCI (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Fri, 27 May 2005 13:46:06 -0500; Martin, I did mean in line as series to the antenna connection. Clearly, having diodes ahead of an attenuator is going to do no good in strong RF fields. By strong, I mean 3 blocks from a daytime 25; /archives//html/TenTec/2005-05/msg00494.html (8,602 bytes)
11. Re: [TenTec] ORION BCI (score: 1): Author: "n4lq" <n4lq@iglou.com>; Date: Fri, 27 May 2005 15:00:14 -0400; Explain how a bad diode causes this. I thought a bad diode would not rectify and a good one would. Is it like partially bad? Would this show up on an ohmmeter? Steve _________________________________; /archives//html/TenTec/2005-05/msg00495.html (9,923 bytes)
12. Re: [TenTec] ORION BCI (score: 1): Author: "Martin, AA6E" <martin.ewing@gmail.com>; Date: Fri, 27 May 2005 15:07:36 -0400; Stuart, As I read the schematics, the Orion should be OK up to about 10 Vpp of RF, before the clipping diodes start conducting. (They are reverse biased.) Maybe something else will go nonlinear first; /archives//html/TenTec/2005-05/msg00496.html (9,966 bytes)
13. Re: [TenTec] ORION BCI (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Fri, 27 May 2005 14:35:10 -0500; Although rare, diodes could exhibit other effects than open or short or normal. It might NOT show up with barrier voltage test of diode section of DMM but might show up if you view the circuit signal; /archives//html/TenTec/2005-05/msg00497.html (8,852 bytes)
14. Re: [TenTec] ORION BCI (score: 1): Author: "n4lq" <n4lq@iglou.com>; Date: Fri, 27 May 2005 15:49:26 -0400; Ok but I doubt all of this. The Orion I had here was totally devistated by BCI from WHAS, 50kw about 10 miles away when using my loop. The loop gives any rig a hard way to go unless there's a tuner i; /archives//html/TenTec/2005-05/msg00498.html (9,921 bytes)
15. Re: [TenTec] ORION BCI (score: 1): Author: "Martin, AA6E" <martin.ewing@gmail.com>; Date: Fri, 27 May 2005 16:52:18 -0400; Steve, I don't doubt your reports. Vacuum tubes are the best for strong signals! Can you measure the actual BC voltage at the antenna terminals? 73 Martin AA6E -- martin.ewing@gmail.com http://blog.a; /archives//html/TenTec/2005-05/msg00501.html (9,100 bytes)
16. Re: [TenTec] ORION BCI (score: 1): Author: "Steve N4LQ" <n4lq@iglou.com>; Date: Fri, 27 May 2005 18:37:47 -0400; Hmmm. I suppose I could rectify and filter it then measure the DC voltage with my DVM or perhaps the scope. A couple of years ago I disconnected the ground wire between the furnance and cold water pi; /archives//html/TenTec/2005-05/msg00502.html (10,401 bytes)
17. [TenTec] ORION BCI (score: 1): Author: Lee Crocker <w9oy@yahoo.com>; Date: Fri, 27 May 2005 13:26:28 -0700 (PDT); If the diodes are reverse biased, then it sounds to me like you lost bias. Could be nothing more than a loose plug on the board. Why do you presume the problem is a design flaw and not just a glitch; /archives//html/TenTec/2005-05/msg00505.html (8,053 bytes)
18. Re: [TenTec] ORION BCI (score: 1): Author: Robert & Linda McGraw K4TAX <RMcGraw@Blomand.Net>; Date: Fri, 27 May 2005 20:57:15 -0500; Based on a report that inserting a 6 dB attenuation at the RX input and that reduced the BCI which was S9 + 20 dB or so tells me that the IM is being generated in the radio. If it were external then; /archives//html/TenTec/2005-05/msg00506.html (11,028 bytes)
19. Re: [TenTec] ORION BCI (score: 1): Author: wq7x@cox.net; Date: Thu, 05 May 2005 13:17:20 +0100; OTHERS REPORTED THE SAME PROBLEM. SIMPLE ANSWER AND TO THE POINT. Mark wq7x _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailm; /archives//html/TenTec/2005-05/msg00507.html (8,924 bytes)
20. [TenTec] ORION BCI (score: 1): Author: Lee Crocker <w9oy@yahoo.com>; Date: Sat, 28 May 2005 08:14:17 -0700 (PDT); One other reported a similar problem on his loop antenna. The radio station he reported the problem with transmits on 840khz. 1/4 wave on 840 is 278ft. If his loop is full wave on 3.6 mhz its length; /archives//html/TenTec/2005-05/msg00541.html (10,154 bytes)

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