K3 synthesizer spur?

[K5SM]

I have recently noticed an unusual spur on 20 meter ssb (enters the
passband at about 187.3 and exits at about 187.4). It is apparently a
synthesizer spur as it tracks with vfo knob movement ....except in the
opposite direction and in steps x10 the tuning increment. Have a similar
spur on 50 mhz (about 50.094). Anyone else noticed this and/or
discovered a fix? It jumps about 50khz down when I change the mode from
usb to lsb on 50mhz.

73, Bob K5SM
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[Richard Ferch]

This is what the CONFIG:SIG RMV feature is for. Take a look at the
firmware release notes (hfwnotes.pdf or hfwnotes.rtf file) under MCU
3.03, "New Feature: Spurious Signal Removal".

73,
Rich VE3KI


K5SM wrote:

> I have recently noticed an unusual spur on 20 meter ssb (enters the
> passband at about 187.3 and exits at about 187.4). It is apparently a
> synthesizer spur as it tracks with vfo knob movement ....except in the
> opposite direction and in steps x10 the tuning increment. Have a similar
> spur on 50 mhz (about 50.094). Anyone else noticed this and/or
> discovered a fix? It jumps about 50khz down when I change the mode from
> usb to lsb on 50mhz.

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[ab2tc]

Hi,

I have them both although the exact frequencies differ a little bit. They are both very weak and the one on 20m is inaudible with a real antenna connected. BTW these are by no means the only internal birdies of this nature on the K3. I'll start worrying about them when I have gotten rid of my last computer (and other electronic devices) birdie.

AB2TC - Knut

Robert Redmon wrote

I have recently noticed an unusual spur on 20 meter ssb (enters the
passband at about 187.3 and exits at about 187.4). It is apparently a
synthesizer spur as it tracks with vfo knob movement ....except in the
opposite direction and in steps x10 the tuning increment. Have a similar
spur on 50 mhz (about 50.094). Anyone else noticed this and/or
discovered a fix? It jumps about 50khz down when I change the mode from
usb to lsb on 50mhz.

73, Bob K5SM
<snip>