I had already heard about this instability you are talking about from some real audiophiles duffy. These guys have been paying real close attention to the flex and they all notice the drifting even with the "high stability osc. mod as well. I'm wondering how flex installs the thermistor from the factory without voiding the warranty on the osc.? I wonder if they solder it in place?
----- Original Message ----- From: "Duffy" <[EMAIL PROTECTED]> To: <FlexRadio@flex-radio.biz> Sent: Monday, July 10, 2006 11:20 AM Subject: [Flexradio] Short takes > >High Stability Mod now available. Radios shipped after April 1, 2006 > have a thermistor soldered to the oscillator, which greatly improves > oscillator stability. This modification is available from our >service > department for $75 plus shipping. The early versions of the SDR1K took > as long as 15 minutes to become frequency stable. The addition of the > thermistor results in a dramatic >improvement; within 1 minute the radio > is as stable as most radios with high stability oscillators. After 3 > minutes, the oscillator is "rock solid". /John Basilotto / > > John I would caution you in your use of terms "High Stability Mod", > "stable as most radios with high stability oscillators" and "rock > solid". I have a late model sdr1k that came with this and I would not > call it "High Stability". Maybe improved stability would be a better > term. I leave my unit on 24 hrs a day and my room temp does vary about > up to 20 deg F sometimes (65 to 85 F ). Thruout the day I will check > 15MHz WWV and every so often I will recalibrate because it is off 5 to > 10 Hz and sometimes 20 to 25 Hz (on a hot day),then in the eve when > cooler I do it again. This is on RECEIVE ONLY, no transmitting. I do > not consider this "rock solid " or " high stability". It is easily > managible with the easy calibration routine, but it does drift and I > wonder how much it would drift if I was transmitting . My other 2 radios > ( Icom 756 Pro and 756 Pro II ) are rock solid after warm up and do not > require this frequent calibration. I put up with this because I read > K2OX 's test of the phase noise and how good this osc., is in that > regard, compared to some others. > I love my SDR and listen to a lot of stuff with it and the noise > reduction and filters are superb. Wish there was a more stable osc with > as good phase noise for a reasonable cost. Duffy NA6MM > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: /pipermail/flexradio_flex-radio.biz/attachments/20060710/f02fae74/attachment .html > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Homepage: http://www.flex-radio.com > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
