David, I can answer the second question now: The SDR-5000 series Internal transverters will use the .5ppm 10MHz internal tcxo and you may select to use a external reference just as the SDR-1000.
Ken Simmons, K5UHF FlexRadio Systems Design Engineer 13091 Pond Springs Rd. #250 Austin, TX 78729 Phone: 512-535-4713 ----- Original Message ----- From: "David Hilton-Jones" <[EMAIL PROTECTED]> To: <flexradio@flex-radio.biz>; "John" <[EMAIL PROTECTED]> Sent: Wednesday, July 02, 2008 1:23 AM Subject: Re: [Flexradio] 144 and 432 - Low vs High Power Design >I suggest that there are two important issues to consider: > > 1) Power output. I have a strong preference for 50-60 watts - that allows > driving of a 13db triode to 1kw. Intermediate amplifiers are undesirable. > > 2) Stability - for digital modes standard crystal oscillators are not > stable enough. I would favour the approach used by DB6NT in their latest > transverters - the ability to lock to an external source (eg 10MHz) - as > an aside, can the 5000A, like the SDR-1000, be fed by an external > frequency source? > > 73 > > David, G4YTL > >>>> "John" <[EMAIL PROTECTED]> 01/07/2008 19:15 >>> > I have received quite a few emails [direct and via the reflector] > regarding > the subject above. Thank you for your input and recommendations. Let me > iterate my earlier post for those not familiar with this tread. > > The transverter design is a work in progress. And, even though our > original > intent was to build a 25 watt dual band unit, we are still considering > other > options with respect to power output. Gerald will have more to say on > this > subject in the weeks to come. In the meantime, we are/will carefully > review > all recommendations. Please forgive me for not responding to each and > every > email, it's a bit hectic around here these day. :-) > 73 > > John P. Basilotto > W5GI > Chief Operating Officer > Marketing and Sales > Office 512 535-5266 > Fax 512-233-5143 > 13901 Pond Springs Rd > Suite 250 > Austin, TX 78729 > > > dio.com/ > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kb.flex-radio.com/ Homepage: > http://www.flex-radio.com/ > > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kb.flex-radio.com/ Homepage: > http://www.flex-radio.com/ > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
