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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AR57TRDVPRQWTAZID7TVF73PSAANV6GT/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "AR57TRDVPRQWTAZID7TVF73PSAANV6GT", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/QT4WNIGWWAM3NY7RVOBGFZK34QULSI5M/?format=api", "sender": { "address": "bill (a) hsmicrowave.com", "mailman_id": "d7ecbf0c1df148f289f27dd7a8c37974", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d7ecbf0c1df148f289f27dd7a8c37974/emails/?format=api" }, "sender_name": "Bill Ress", "subject": "[eagle] Re: The DS4000 Digital Controlled TCXO", "date": "2007-07-04T04:23:32Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WUXW7WF7PW5IVZXCNZDNTPFK6ZUAVNIA/?format=api", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Yes indeed, Jim.- a happy and safe Independence Day to you all.\n\nThe BBQ's cleaned (well sorta) and ready for tomorrow's hot dogs and \nhamburgers!!!\n\nRegards...Bill - N6GHz\n\nJim Sanford wrote:\n> Juan:\n> Based on what I REMEMBER (I'm senile, so take it with a pound of salt) \n> -30 to +50C is plenty at this point.\n>\n> Thanks for all you're doing. You are producing good data and \n> articulating valid concerns, which I'd rather deal with NOW than ON ORBIT.\n>\n> Happy Independence Day to all. Please take some time out to enjoy \n> family, celebrate our Nation, honor our Veterans, and spend some time \n> in what my wife calls, \"Norman Rockwell America.\"\n> Thanks & very 73,\n> Jim\n> [email protected]\n>\n>\n> Juan Rivera wrote:\n>>\n>> Jim and group,\n>>\n>> I can’t either, but here’s another area where we need requirements. \n>> How stable does this receiver need to be to satisfy the needs of the \n>> users? Is it driven by the human ear or the ability of a data decoder \n>> to stay locked up? – We need long term / short term requirements?\n>>\n>> I’m getting set up to do a temperature run tomorrow. I just ran the \n>> radio from +26C to +50C to get an idea what to expect. Here’s what I \n>> found:\n>>\n>> That missing chunk in the middle is me re-patching my test equipment. \n>> When I saw those saw-tooth’s I wanted to hook the TS-2000 up so I \n>> could listen again. Sure enough they are jumps in frequency just as \n>> the chart shows. Each “tooth” is made of multiple data points so this \n>> is not the +/- 1 digit LSB frequency counter error I mentioned earlier.\n>>\n>> For this preliminary test I didn’t have a temperature probe inside \n>> the radio so I don’t know how close to +50 it actually got. Tomorrow \n>> I’ll do a much more thorough job and take it down to about -30C. I’m \n>> thinking -30C to +50C. Any other suggestions as to temp extremes?\n>>\n>> Juan\n>>\n>> ------------------------------------------------------------------------\n>>\n>> *From:* Jim Sanford [mailto:[email protected]]\n>> *Sent:* Tuesday, July 03, 2007 8:08 PM\n>> *To:* [email protected]\n>> *Cc:* 'Bill Ress'; [email protected]\n>> *Subject:* Re: [eagle] Re: The DS4000 Digital Controlled TCXO\n>>\n>> Juan:\n>> I can't imagine it NOT being a problem.\n>>\n>> For the sake of completeness, let's assume that it IS, and solve it.\n>>\n>> Thanks for all your hard work.\n>>\n>> 73,\n>> Jim\n>> [email protected] <mailto:[email protected]>\n>>\n>>\n>> Juan Rivera wrote:\n>>\n>> Hi Bill,\n>> \n>> Aren't all these tools neat? I though you'd like the audio!\n>> \n>> I'm thinking that the uplink guys are going to have to weigh in and tell us\n>> if these jumps are a problem or not for data. I'd think that they would be\n>> for demodulating data and a major annoyance for SSB. It's the sort if\n>> subtle stuff that I didn't notice at first. I'm sure there are a few more\n>> surprises waiting to be discovered.\n>> \n>> I'm curious about the beat since the two oscillators produced IF outputs\n>> that were fairly far apart and yet the beat seems to be around 1 Hz. I\n>> guess I could try to sniff the internal oscillator to see exactly where it\n>> really is.\n>> \n>> 73,\n>> \n>> Juan\n>> \n>> -----Original Message-----\n>> From: Bill Ress [mailto:[email protected]] \n>> Sent: Tuesday, July 03, 2007 6:49 PM\n>> To: [email protected] <mailto:[email protected]>\n>> Cc: [email protected] <mailto:[email protected]>\n>> Subject: The DS4000 Digital Controlled TCXO\n>> \n>> Hi Juan,\n>> \n>> The audio is a fantastic addition to your super analysis regime. Just \n>> really fine work!!\n>> \n>> I've already addressed the issue of the two 10 MHz oscillators beating \n>> as heard in clip #1.\n>> \n>> Now what you hear in the second audio clip doesn't surprise me. Just \n>> another reason why I remain digitally challenged and analog biased.\n>> \n>> The DS4000 is a \"digitally\" corrected voltage controlled oscillator. I \n>> believe what you are hearing is the frequency being corrected in finite \n>> digital steps. An analog temperature corrected VCO will not do this. The \n>> correction will be continuous and smooth. The key advantage of the \n>> \"digitally\" corrected VCO is the ability to \"remotely\" correct the \n>> frequency with a digital input. I would submit, that feature is not \n>> needed for our application.\n>> \n>> The \"analog\" TCVCXO used in the S2 concept converter uses a low cost \n>> device (available from several suppliers) and offers +/- 1 PPM stability \n>> over temperature (-40 to 85 C).\n>> \n>> Regards...Bill - N6GHz\n>> \n>> Juan Rivera wrote:\n>> \n>>> All,\n>>> \n>>> I should have gone to work today but I ended up working on the 70 cm \n>>> Receiver all day instead. Today marks a milestone for me -- my first \n>>> use of audio files. You'll find two in my write up if you click HERE \n>>> <http://www.juanr.com/pages/hobbies/ham_radio/Eagle/Stability.htm>. I \n>>> think they work much better than descriptions and graphs. Now you can \n>>> hear what I'm talking about...\n>>> \n>>> Have a great 4th! I plan to do a temperature run on the receiver \n>>> tomorrow to celebrate! Let's see what that internal oscillator does \n>>> when it's not at room temperature!\n>>> \n>>> P.S. to OSCAR guys... If you have time come on over and help me run \n>>> this test. I'll probably start early to beat the heat. If you've never \n>>> been gassed by CO2 before, now is your chance!\n>>> \n>>> 73,\n>>> \n>>> Juan - WA6HTP\n>>> \n>>> \n>> \n>> \n>> \n>> _______________________________________________\n>> Via the Eagle mailing list courtesy of AMSAT-NA\n>> [email protected] <mailto:[email protected]>\n>> http://amsat.org/mailman/listinfo/eagle\n>> \n>> \n\n", "attachments": [] }