Freq center auto adjust

My ICOM PCR-1000 scanner has a feature to auto adjust
the frequency to get the strongest signal to
compensate where the center frequency drifts a few
hertz, say drifts 0.0040Mhz in the 900Mhz range. My
question is what is this feature called and is there
an equivalent for USRP/GNURadio?

Thanks,

George B.
[email protected]

George B. wrote:

My ICOM PCR-1000 scanner has a feature to auto adjust the frequency
to get the strongest signal to compensate where the center frequency
drifts a few hertz, say drifts 0.0040Mhz in the 900Mhz range. My
question is what is this feature called and is there an equivalent
for USRP/GNURadio?

This is typically call Automatic Frequency Control and shortened to AFC.

Accomplishing AFC is modulation specific; in GNU Radio one typically
builds a flow graph that incorporates AFC by using an appropriate
phase-locked loop.


Johnathan C.
Corgan Enterprises LLC
http://corganenterprises.com

On Mon, Mar 12, 2007 at 10:45:14AM -0700, Johnathan C. wrote:

This is typically call Automatic Frequency Control and shortened to AFC.

Accomplishing AFC is modulation specific; in GNU Radio one typically
builds a flow graph that incorporates AFC by using an appropriate
phase-locked loop.

Probably I am quibbling terribly, but mostly AFC implies
a frequency locked loop… usually used to correct the LO frequency
so a signal sits in the center of the passband.

Sometimes the VCO (NCO) frequency offset of a PLL IS used
for this, but it doesn’t have to be…


Dave Emery N1PRE, [email protected] DIE Consulting, Weston,
Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
‘For Rent’ sign still vainly flapping outside on the weed encrusted pole

  • in
    celebration of what could have been, but wasn’t and is not to be now
    either."

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