There is a multiplier circuit/ PLL in the DBS-RX. Whatever phase noise
is coming from the oscillator is being multiplied considerably by this
upconversion to be used at LO in the DBS-RX. You cannot get low phase
noise oscillators and high performance mixers in that small a package.
Together these considerations imply more power and territory and thermal
control than is available with the DBS-RX.
Bob
Marcus Leech wrote:
Gregory W Heckler wrote:
I measured the phase noise of the 64 MHz board clock. Looking at the
result, I doubt the board clock is producing the phase noise I am
seeing in my receiver.
--
AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair
"Taking fun as simply fun and earnestness in earnest shows
how thoroughly thou none of the two discernest." - Piet Hine
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