You will get spikes with no antenna where they are not covered up by band 
noise. Also if you have a really big spike near where you are tuning, try 
turning down the NB level in THE PX3 or turn the PX3 NB OFF.

Elecraft have explained about these spikes which are as a result of the 
switched mode regulators in the PX3, but they are not a problem when you have 
an antenna connected with band noise.

Let us know how that goes.

73 from David GM4JJJ

> On 9 Sep 2016, at 16:31, Larry Naumann <n...@att.net> wrote:
> 
> Don
> Thanks for the suggestion but that does not fix/improve the situation. 
> Looking at it further I also have spikes at roughly 23, 30 and 52Khz above 
> and below my cursor. The 52 Khz signal is at S4 the other two are about S2. I 
> can turn on the PX3 and look at the display with no antenna connected and see 
> these spikes on every band. If I disconnect the cables to the KX3 the signals 
> are still there but go down to S1 in strength. I have even tried running both 
> on separate battery supplies but the problem is the same. The spikes are 
> there even if I disconnect the I/Q cable but the spikes are very small, as 
> soon as the I/Q cable is plugged in the spikes increase.
> Larry
> n0sa
>> On 9/9/2016 9:22 AM, Don Wilhelm wrote:
>> Larry,
>> 
>> I suspect hum, buzz, and noise pickup on the RX I/Q cable shield between the 
>> KX3 and the PX3.
>> Try "Bonding" - run a heavy wire or strap between the KX3 and the PX3 in 
>> parallel with the RX I/Q cable.  The shield from old RG-8 coax works well.
>> 
>> 73,
>> Don W3FPR
>> 
>>> On 9/9/2016 10:12 AM, Larry Naumann wrote:
>>> I have just recently noticed that there is a continual spike that follows 
>>> my cursor. It is internally generated. In CW mode it is away from my tuned 
>>> signal by the amount of my CW side tone setting and can be switched to 
>>> above or below the cursor depending on if I am in CW or CW-R.
>>> These spikes occur with no antenna connected and are S4 to S5 in strength 
>>> depending on band.
>>> I did the Opposite Sideband Rejection adjustment but show no improvement.
>>>  I think something is either set wrong or I have an issue.
>>> Any help or ideas are appreciated.
> 
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