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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TenTec\]\s+Orion\s+II\s+\-\s+Tech\s+Topics\s*$/: 27 ]

Total 27 documents matching your query.

1. [TenTec] Orion II - Tech Topics (score: 1)
Author: Bill Tippett <btippett@alum.mit.edu>
Date: Mon, 07 Aug 2006 20:56:23 -0400
Ten-Tec has added a "Tech Topics" link on their Orion II page with the following objective: Orion II Tech Topics (link is to left or main O2 page) "In-depth coverage of technical issues and questions
/archives//html/TenTec/2006-08/msg00315.html (7,108 bytes)

2. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: Sinisa Hristov <shristov@ptt.yu>
Date: Tue, 08 Aug 2006 03:04:20 -0400
I do love my Orion deeply and truly, but nevertheless I find the persistence of the "Frequency Stability" hoax unbelievable. It appears now in three places: on the Orion II page, in the manual and on
/archives//html/TenTec/2006-08/msg00322.html (8,147 bytes)

3. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: Martin AA6E <aa6e@ewing.homedns.org>
Date: Tue, 08 Aug 2006 09:40:02 -0400
Another way to say this is that if your TCXO frequency goes up by 1 ppm, your dial reading will go down by 1 ppm. (Neglecting the small matter of the unsynchronized A-to-D converter clock.) This is b
/archives//html/TenTec/2006-08/msg00329.html (8,072 bytes)

4. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: wa3fiy@radioadv.com
Date: Tue, 08 Aug 2006 12:11:47 -0400
What about the Wadley Loop? It is my understanding that it provided a high degree of stability using a tunable (read drifty) VHF oscillator and a 1 Mhz crystal oscillator rich in harmonics along with
/archives//html/TenTec/2006-08/msg00333.html (10,629 bytes)

5. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 08 Aug 2006 10:37:25 -0500
Yes, it works, so long as you don't mind not having any real selectivity until after it, and don't mind the extra mixer noise and limited dynamic range because if you put selectivity in that first IF
/archives//html/TenTec/2006-08/msg00334.html (9,118 bytes)

6. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: wa3fiy@radioadv.com
Date: Tue, 08 Aug 2006 12:44:43 -0400
I realize those limitations. What I was getting at, apparently not very well, was that mixing schemes may indeed be able to minimize the effect of drift in oscillators. I was using the Wadley Loop as
/archives//html/TenTec/2006-08/msg00335.html (10,697 bytes)

7. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: Sinisa Hristov <shristov@ptt.yu>
Date: Tue, 08 Aug 2006 12:48:53 -0400
All of the cancellation is already there in Orion I. Both Orion I and Orion II achieve the same result with immeasurable difference, which is present only because the DSP sampling frequency is not lo
/archives//html/TenTec/2006-08/msg00337.html (8,910 bytes)

8. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: Martin AA6E <aa6e@ewing.homedns.org>
Date: Tue, 08 Aug 2006 12:51:17 -0400
You still need a stable reference oscillator somewhere. You only cancel the drift of the first L.O. If the reference oscillator drifts by a ppm, your overall frequency calibration drifts by a ppm. 73
/archives//html/TenTec/2006-08/msg00338.html (9,340 bytes)

9. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Ron Castro" <ronc@sonic.net>
Date: Tue, 8 Aug 2006 12:41:32 -0700
If we want real frequency stability, here is what is needed: http://www.bliley.com/n47x___nv47x___co_08.pdf I wonder if TT would be willing to order a few of these custom since a volume purchase woul
/archives//html/TenTec/2006-08/msg00353.html (10,832 bytes)

10. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Grant Youngman" <nq5t@comcast.net>
Date: Tue, 8 Aug 2006 13:02:44 -0700
After fretting over a few Hz for a while, I'm beginning to wonder why it matters so much, other than being able to measure it in so many parts ber gezillion and be able to just dial in the result fo
/archives//html/TenTec/2006-08/msg00355.html (9,167 bytes)

11. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Ron Castro" <ronc@sonic.net>
Date: Tue, 8 Aug 2006 13:15:23 -0700
I notice such things...even that net control of the Sunday 20 meter TT net is always 20 Hz low in frequency on his Jupiter! And I hate it when I'm in a round-table or a net and not everyone is on the
/archives//html/TenTec/2006-08/msg00357.html (10,391 bytes)

12. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Grant Youngman" <nq5t@comcast.net>
Date: Tue, 8 Aug 2006 13:27:16 -0700
I'm still sitting here with a "shrug". Not trying to start an argument, of course, but the NCS is always, by definition, on frequency. You were 20 Hz high :-) We all have our own little nits to pick
/archives//html/TenTec/2006-08/msg00358.html (8,734 bytes)

13. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Ron Castro" <ronc@sonic.net>
Date: Tue, 8 Aug 2006 13:31:07 -0700
Well, you're right about that! Looking at the dial read 14.328.980 bugs me though... Ron N6AHA _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.c
/archives//html/TenTec/2006-08/msg00359.html (9,384 bytes)

14. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 08 Aug 2006 15:34:40 -0500
The improved reference phase will probably be masked by the PLL phase noise anyway. My local standard does a part in 100 million per week, and order of magnitude better short term, and its been doing
/archives//html/TenTec/2006-08/msg00363.html (9,989 bytes)

15. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 08 Aug 2006 15:37:59 -0500
I did 1 part per million once with a 75S-3B on 40 meters in an FMT. That was with 1 KHz dial divisions. Now at VHF and microwave I find most rigs are precisely inaccurate and so don't run a 50 Hz fil
/archives//html/TenTec/2006-08/msg00364.html (9,831 bytes)

16. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 08 Aug 2006 15:41:42 -0500
Are you SURE its not your ear that's tuning 20 Hz off. Have you analyzed the bass voice harmonics to be certain they come out of your speaker at 3 x the fundamental, not 3 x +/- 20 Hz? Nope. The 2m m
/archives//html/TenTec/2006-08/msg00365.html (9,902 bytes)

17. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 08 Aug 2006 15:42:45 -0500
So cover the last three digits with black tape. Or adjust the software to read only to the nearest KHz. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer __________
/archives//html/TenTec/2006-08/msg00366.html (9,106 bytes)

18. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Ron Castro" <ronc@sonic.net>
Date: Tue, 8 Aug 2006 14:58:58 -0700
Very sure...when harmonics are not aligned harmonically (as they should be!), they become dissonant, much like IMD as opposed to harmonic distortion, which is more musical and less irritating. Unless
/archives//html/TenTec/2006-08/msg00368.html (11,049 bytes)

19. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Ron Castro" <ronc@sonic.net>
Date: Tue, 8 Aug 2006 15:00:21 -0700
Then I'm a whole kHz off instead of only 20 Hz!!! Ron N6AHA _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tent
/archives//html/TenTec/2006-08/msg00369.html (10,145 bytes)

20. Re: [TenTec] Orion II - Tech Topics (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 08 Aug 2006 16:18:19 -0500
But all current amateur practice is the hetrodyning transverter with multipliers only in the LO stages, using an HF or VHF transceiver for IF and for transmit signal. That way it works for all modes
/archives//html/TenTec/2006-08/msg00370.html (11,674 bytes)

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