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| To: | <[email protected]> |
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| Subject: | Re: LF: 500khz WSPR drift |
| From: | "James Moritz" <[email protected]> |
| Date: | Thu, 14 Jan 2010 21:04:01 -0000 |
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| References: | <[email protected]> <20100113220536.23ff9c6e@opc1> <[email protected]> <CE0B95E8C8B24987B4FD88B20717C3B1@JimPC> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> |
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Dear Andy, Roger, LF Group,In my transverter design, I have added a "ref out" socket to the IC718 driving transceiver to make the 32MHz reference oscillator available externally. This is divided to 4MHz for use as the LO in the transverter mixer. The overall frequency stability is thus that of the reference in the IC718, which has the TCXO option, so frequency is quite accurate, within about 0.1Hz at 500k last time I checked, and drift during operation rather less than that. BTW, I also have an FT-817 - I don't think they have done it on the cheap... the 22.625MHz is the actual frequency reference, driving LO and BFO DDSs via various multipliers and also providing the 2nd LO signal, but I think the 22.7785 is a VCXO which is modulated by the TX audio and then tripled to obtain NBFM at the 1st IF frequency. Cheers, Jim Moritz 73 de M0BMU----- Original Message ----- From: "Andy Talbot" <[email protected]> To: <[email protected]> Sent: Thursday, January 14, 2010 8:22 PM Subject: Re: LF: 500khz WSPR drift Yes, I did :-) The FT817 block diagram shows two oscillators in the chain a master at 22.625 and 'another' at 22.7785 - so that idea gets knocked out straightaway. They done it on the cheap :-( |
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