New K1 - 4 bander with transmit offset problem

[Jim F.-3]

Nice to be on the list..
..
My K1 - 4 bander  has a transmit offset problem....(Or I do !)
 
On transmit the frequency should increase by about +700 Hz.
It decreases about -100Hz on 20m, to  about -900Hz on 17m.
 
Each band is different.
 
The RIT/XIT function is off, and the knob does not change transmit or receive frequency.
 
Any suggestions ?
 
W1FMR


Best Regards,

Jim
   
 I Don't eat snails...I prefer fast food.






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[Mike Morrow-3]

Jim wrote:

>My K1 - 4 bander  has a transmit offset problem....(Or I do !)
>
>On transmit the frequency should increase by about +700 Hz.
>It decreases about -100Hz on 20m, to  about -900Hz on 17m.


Jim,

The K1 receiver functions in LSB mode, which means the associated
transmitter frequency should be **below** the receiver frequency by the
amount of your desired sidetone pitch, where the receiver frequency is
defined at that which produces a zero-beat when a signal is tuned in.

Example:  If I am using a 600 hz sidetone (STP menu), I want my transmitter
offset to be 600 Hz below the receiver frequency.   I have to adjust RF PCB
C13 to get the proper offset, as described in the manual.

Complicating this concept is the fact that most hams want the display to
show transmitter frequency, not receiver frequency.  Thus, when my K1 is
zero beat with 10000 kHz WWV, my LCD actually displays 9999.4 kHz since I
have a 0.6 kHz transmitter offset below the receiver frequency.  I used OPF
CAL to make the display show 9999.4 when zero beat with the 10000 kHz
signal.

I am puzzled by your reports.  The K1 display counter only detects the VFO
frequency and does not change when one goes from receiver to transmit except
to show a bar representing the output power level.  How have you determined
what the transmit offset is doing?

Secondly, the transmit offset varies only with the setting of C13.   There
is absolutely no band of operation dependence.  No matter what band you're
on, the offset will remain fixed by C13.  Please describe what actual method
you are using to come up with the perceived band-dependent offset values.


73,
Mike / KK5F

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