[Fwd: LF: Frequency stability]

[Andre' Kesteloot]

Mike Dennison wrote:

> > The main frequency error source is the LO in the receiver. Suppose that the RX
> > has a first IF at 40 MHz. Then 1 ppm error is a 40 Hz shift. If the second
> > LO is derived from the same reference that may largely cancel out. It all
> > depends from the conversion scheme / LO generation in your RX.
> >
> > 73 - Marco
> >
>
> It's easy to remove all oscillator errors by using a receiver with two
> VFOs (actually the same VFO but programmed differently), such
> as most modern transceivers. Keep one VFO tuned to a standard
> frequency source, such as Rugby (60kHz) and use that to set the
> display calibration on Spectrogram. Switch to the other VFO and
> you have a receiver with an accurate readout down to 1Hz.
>
> > Marco Bruno - IK1ODO
> > spin@inrete.it
> >
> > SPIN Electronics - www.spin-it.com
> >
> >