[Elecraft] RIT/XIT

Fri Jan 24 21:53:00 2003

Lyle,

Do these 5 kHz "boundaries" you mention have anything to do with the little
pop I hear every 5 kHz as I tune across the band?  If there is a signal
close to the "boundary" I notice a frequency shift of about 80 Hz as I tune
across these as well.  I'm new to these rigs so I know I have a lot to learn
about them.

73,
Sam KL7V/5, K2 #3158

----- Original Message -----
From: "Lyle Johnson" <[email protected]>
To: <[email protected]>
Sent: Friday, January 24, 2003 11:42 AM
Subject: RE: [Elecraft] RIT/XIT

> > To save me bothering Gary again (he's busy enough as it is) is there
> > anyone out there who can explain how the RIT or XIT offset is applied to
> > the K2.  I can see it originates from the Front Panel and the voltage
> > from the pot goes to U3 pin 16, but thats where I lose it.  Any ideas
> > are most welcome :-)
>
> The output of the front panel control is a DC voltage read by an
> analog-to-digital converter internal to the main PIC processor (U6,
control
> board).  The processor calculates the PLL offset settings (applied to the
> synthesizer chip [U14, RF board] on 5 kHz "boundaries" as well as to the
DAC
> [U5, RF board] that drives the PLL reference oscillator) and applies them
on
> transmit (XIT) or receive (RIT), as appropriate.
>
> 73,
>
> Lyle KK7P
>
>
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