[Elecraft] K3 - Receiver desense?

[Fred Jensen]

Hmmm ...

Not that I'm suggesting you try and recreate the "experiment" Jeff, all 
sorts of undesirable electrical effects occur on the 12V power in a 
vehicle when you start it, but possibly some sort of transient scrambled 
the K3.  I shouldn't do it, but I often start my truck with the ICOM 
IC-4300H still on.  About half the time it reboots, the other half it is 
fine.  I think the factory recommended method to shut down your K3 is, 
"Turn it off," then do whatever you want to with the power supply.  Just 
a thought.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2011 Cal QSO Party 1-2 Oct 2011
- www.cqp.org

On 4/4/2011 4:06 PM, Jeff Cochrane - VK4BOF wrote:

> Whilst parked up in the car and with the K3 running on 15M during CQ WW SSB I noticed that the display lights were flickering alot on TX, indicating to me that maybe it was time to start the engine to increase voltage to the rig.
> Received sigz at the time were plentiful (crowded) and loud, the band was wide open.
> So, I started the engine and all sigz but for a couple of what used to be loud signals had disappeared!
> The really loud sigz I had heard before were considerably reduced in volume and signal strength.
> I checked the NB and NR settings and found that both noise blankers were both turned off as was noise reduction off.
> I tried both NB's and neither were of any use.
> There was no type of noise heard on the radio at all apart from the usual (low down) band noise.
> All the above was noted when I was using the cars own battery / power system.
>
> I shut down the engine and all sigz came back to normal.