Re: [Elecraft] P3 - powering from the K3 aux plug

2010-08-18 Thread Alan Bloom
On Wed, 2010-08-18 at 14:16 -0700, Lyle Johnson wrote: > The short answer is no. The long answer :=) is that the P3 uses a pair of DC-DC converters to convert +12V down to the +3.3V and +5V needed by its circuitry. This tends to make the input "constant power" meaning that current times volts is

Re: [Elecraft] P3 - powering from the K3 aux plug

2010-08-18 Thread Bruce Beford
Glenn, That output is fused internally at 600 mA, and is supplied via a 1n4007 diode (1 amp max). Best not to exceed the 500 mA recommended max load. An option would be to supply power to your powerpole strip from the same supply that feeds the K3, but have it switched by a small relay controlled b

Re: [Elecraft] P3 - powering from the K3 aux plug

2010-08-18 Thread Iain MacDonnell - N6ML
On Wed, Aug 18, 2010 at 9:01 PM, GLEN BROWN <210g...@gmail.com> wrote: > Guys, > I run a number of accessories from the switched power on the back of the K3. >  I run it to a powerpole strip and then just plug in all the items that I > want to power up with the rig.  So far I run a W2, an LP-PAN an

Re: [Elecraft] P3 - powering from the K3 aux plug

2010-08-18 Thread Lyle Johnson
The short answer is no. 73, Lyle KK7P > ...The K3 plug says 0.5A max, which is what > the P3 draws. So it looks like its either/or. Is there > enough conservatism in the rating of that power socket to add the P3? __ Elecraft mailin

[Elecraft] P3 - powering from the K3 aux plug

2010-08-18 Thread GLEN BROWN
Guys, I run a number of accessories from the switched power on the back of the K3. I run it to a powerpole strip and then just plug in all the items that I want to power up with the rig. So far I run a W2, an LP-PAN and a 6m pre-amp. I'd like at add the P3. The K3 plug says 0.5A max, which is w