Re: [Elecraft] P3 generates noise on 144 MHz

2013-02-12 Thread John Lemay
...@mailman.qth.net] On Behalf Of Roger Crofts Sent: 12 February 2013 00:10 To: elecraft reflector Subject: Re: [Elecraft] P3 generates noise on 144 MHz Thanks to everyone who responded. With your help, I have already reduced the noise level from S9+5db down to S6. The receiver noise floor is S3, so I

Re: [Elecraft] P3 generates noise on 144 MHz

2013-02-11 Thread Stephen Prior
I've had absolutely no issues with my P3 and a 2m ssb transceiver just inches from it. This will doubtless be the exception rather than the rule. There must be something not quite right somewhere. 73 Stephen G4SJP On 11 February 2013 07:37, Tim Hague m0...@yahoo.co.uk wrote: I'd be

Re: [Elecraft] P3 generates noise on 144 MHz

2013-02-11 Thread Roger Crofts
Thanks to everyone who responded. With your help, I have already reduced the noise level from S9+5db down to S6. The receiver noise floor is S3, so I still have a little way to go. There is now no doubt that the P3 power cord is responsible for most of the noise radiation. Putting the ferrite

[Elecraft] P3 generates noise on 144 MHz

2013-02-10 Thread Roger Crofts
I recently installed the K144XV 2meter converter in my K3. I could work strong stations on 2m with no problem, but weak stations were swamped by noise which was S9 over the entire band. My P3 was showing that the noise consisted of carriers every 19KHz with lots of buzzy noise in-between. I

Re: [Elecraft] P3 generates noise on 144 MHz

2013-02-10 Thread K7MDL
I took special care to ensure all case covers metal to metal connections were sanded free of paint. I also did my best to route internal coax cables near the K3 Synth unit modules in a way to prevent least problems. I also use a ferrite snap on cylinder with several wraps on the 12VDC P3 power

Re: [Elecraft] P3 generates noise on 144 MHz

2013-02-10 Thread David G4DMP
I had a similar problem, Roger, and cured it completely by putting a ferrite clamp-on on each end of the 12V power cable between the K3 and the P3. But YMMD 73 de David G4DMP In a recent message, Roger Crofts ro...@monitorsensors.com writes [snip] I could work strong stations on 2m with no

Re: [Elecraft] P3 generates noise on 144 MHz

2013-02-10 Thread Tim Hague
I'd be interested to see the EMC Test Report on the P3, required for selling into the EU and I think Australia, the P3 should not radiate emissions at this level and pass EN55022 or similar standards. Perhaps Elecraft could comment please?. I was thinking of picking up a P3 at Dayton but may