[Elecraft] KAT-500 problem

[Fred Jensen]

If the KAT500 is not bonded to the K3, external to the coax, and the 
combination is not bonded to the building's earth electrode, you DO have 
an antenna on the K3 and are demonstrating that its MDS is impressive.  
It doesn't take much to make a receiving antenna.  Actually, if you saw 
my HOA-stealth WOOF antenna, you'd realize it doesn't take a lot to 
transmit either. [:=))

73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn

On 11/23/2019 2:42 PM, Don Wilhelm wrote:
> John,
>
> It sounds to me like you actually do have some kind of antenna effects 
> floating around in your shack.
> Pickup from RF on the outside of the coax being conducted to the 
> ground plane of the receiver through some "sneak paths".
>
> What happens if you disconnect the receiver from the KAT500?
>
> How close are your antennas to the shack?  Maybe direct pickup by the 
> circuits in your receiver is possible.
>
> Do you have all screws in the enclosure for the receiver, amplifier 
> and KAT500 installed and secured?
>
> Check the coax between the receiver, amplifier and KAT500 for 
> tightness - replace with known good coax jumpers as a test.
>
> Try bonding wires between the receiver enclosure, to the amplifier 
> enclosure, and then on to the KAT500.  You can connect the KAT500 end 
> of that bonding chain to your shack ground.  That gives a better path 
> than grounding each piece of equipment to a single point ground.
> Even if you have each piece grounded, try adding the box to box direct 
> bonding wires.
>
> 73,
> Don W3FPR