K2 Receive tuning "blips"

[Jim AB3CV]

As I tune the K2 across the band I get periodic little "blips". They aren't
birdies and they don't hinder reception. As I sit either side of the
frequency where the blip occurred there is no apparent signal or
interference. They actually tic the S-meter a few notches as well. The blip
occurs when the display changes from 3-4 on the least significant freq
digit. So there's really no way to "sit" on the frequency.

I'm guessing this has to do with the way the PLL and VFO tuning interact.

Is it normal to hear such little blips? Or do I need to do some debugging?

Currently I get it at 7014.73 as I transition to .74.

Likewise at 7019.73-74, 7024.73-74 and 7029.73-74.

Interestingly I only hear it with my antenna attached and not when open or
with a 50ohm dummy load.

Antenna/feedline: 88ft doublet @ 50ft elevation remoted 60ft from house.
50ft of 450ohm windowline to SG211 at mounted directly below center point.
60ft underground feed via RG213 from SG211 to K2.

73

jim ab3cv


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[Daniel Reynolds-2]

If anyone has an older (Revision B - SN 3000 series) MCU (U6) that they  no longer need, please let me know. I need to replace mine which has  been damaged.
 
  Please contact me off list.
 
  Thanks,
  Daniel AA0NI
 
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[Don Wilhelm-3]

Jim,

Those are the 5 kHz transitions from the PLL.

First check the resistance across RFC15 on the bottom of the RF Board - it
should be quite low.  If it is open and you do not have an immediate
replacement, place a shorting jumper across it.

If RFC15 is OK and you still have the clicks, re-run CAL PLL.  Be certain
the bottom cover is in place when running CAL PLL.

73,
Don W3FPR

> -----Original Message-----
>
> As I tune the K2 across the band I get periodic little "blips".
> They aren't
> birdies and they don't hinder reception. As I sit either side of the
> frequency where the blip occurred there is no apparent signal or
> interference. They actually tic the S-meter a few notches as
> well. The blip
> occurs when the display changes from 3-4 on the least significant freq
> digit. So there's really no way to "sit" on the frequency.
>
> I'm guessing this has to do with the way the PLL and VFO tuning interact.
>
> Is it normal to hear such little blips? Or do I need to do some debugging?
>
> Currently I get it at 7014.73 as I transition to .74.
>
> Likewise at 7019.73-74, 7024.73-74 and 7029.73-74.
>
>

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