On 4/25/16 1:36 PM, Attila Kinali wrote:
On Mon, 25 Apr 2016 21:41:57 +0200
Ilia Platone <i...@iliaplatone.com> wrote:
I'm trying to build a GPSDO with a FVXO-HC53BR-10 (Fox Electronics) VCXO
Please note that the HC53 family is what is commonly called "programmable
crystal oscillator". Which means it is a combination of a crystal oscillator
with a VCO and a PLL. The crystal runs at an arbitrary frequency and is
used to stabilize the VCO. The use of a standard crystal makes these devices
very cheap, but their phase noise performance is rather bad.
No kidding.. we have one of those in a breadboard receiver and the phase
noise makes acquiring a narrow band BPSK modulated signal virtually
impossible. We use it to verify that the circuit design is ok (e.g. we
grab the right number of samples from the ADC in the right amount of
time), but trying to get carrier lock is a dicey proposition.
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