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[K3][P3] 6m Preamp and P3 on AUX Pwr

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Ken Kopp-3

[K3][P3] 6m Preamp and P3 on AUX Pwr

Would it be "safe" to add the W2 to this mix?

K0PP

> Yes. The 12 V aux current should be kept below 500 mA, and the P3+PR6
> should be well below this.
>
> Wayne
> N6KR
>
>
> On Aug 21, 2010, at 1:56 AM, David Ferrington, M0XDF wrote:
>
>> I've seen the postings about providing power from the K3 Aux 12v
>> socket - is there enough to drive the 6m Pre-amp and the P3?
>> 73 de M0XDF, K3 #174, P3 #108

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Don Cunningham

Re: [K3][P3] 6m Preamp and P3 on AUX Pwr

I would think we users are getting to a point where a good, automotive relay
designed for continuous duty usage would be a good idea here. Simply use
the 12v auxilliary power to feed the coil of the relay and let the contacts
of the relay feed power from our 12v supplies. I don't remember the stock
numbers of the parts, but we used these in an oilfield industrial
application a few years ago and had VERY few failures, and when we did, they
were readily available local to the unit being used. They have a multitude
of mounts so they should be easy to integrate into the shack. That's the
route I plan to take, that is if the relay pulls less than 500 mills, hi.
73,
Don, WB5HAK

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Ken Kopp-3

K3 power-on relay

Long-in-the-tooth two-way shops know them as
"A" relays, but they're no longer used. Maybe a
shop near you still has some in a dusty bin. (:-)

73! Ken Kopp - K0PP

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Don Cunningham

Re: K3 power-on relay

I know of the two way "A" relays, but the ones I am referencing are plug
ins, have a multitude of mounts for bases and are VERY available even likely
at WalMart. I'll get more info when I build mine in if anyone is
interested, but they are not in a "dusty bin" as they are in your new
vehicle's fuse box, I wager, hi.
73,
Don, WB5HAK

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Ken Kopp-3

Re: K3 power-on relay

Yes Don, I know the type you refer to ... black
cube with flat blade pins. I have a couple left
over from my 17 VW's. (;-)

73! Ken Kopp - K0PP

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Bob-270

Re: [K3][P3] 6m Preamp and P3 on AUX Pwr

In reply to this post by Don Cunningham

For that application even Radio Shack has 2. Numbers 275-226 & 275-218.

My local NAPA store also had them in blister packs but I have not
checked in awhile.
They were a little more in cost than Radio Shack.

A relay in this usage is a mechanical current amplifier.

73,
Bob
K2TK

On 8/21/2010 1:09 PM, Don Cunningham wrote:

Brett Howard

Re: [K3][P3] 6m Preamp and P3 on AUX Pwr

In reply to this post by Don Cunningham

I went to radio shack and got the relay I needed. I then built a box
that will pass 10A to several RCA connectors (I wanted to be able to
plug the units plugged into the box into the K3 when portable with a sub
set of my goodies). Anyway I then also got a few of the cheapy cores
that Radio Shack has there. I put an LC filter on each port just for
fun... I figured if I was making it it only takes a short bit of time
to put some RF filtering on each port... I also stuck a couple big bulk
caps in there just for grins. Then an LED to signify that its on too
(why not...). Finally installed a suitable cord with an APP on it to
supply the 10A of power. All in all its a useful little box and every
piece of it can be had at Radio Shack still today.

~Brett

On Sat, 2010-08-21 at 12:09 -0500, Don Cunningham wrote:

> I would think we users are getting to a point where a good, automotive relay
> designed for continuous duty usage would be a good idea here. Simply use
> the 12v auxilliary power to feed the coil of the relay and let the contacts
> of the relay feed power from our 12v supplies. I don't remember the stock
> numbers of the parts, but we used these in an oilfield industrial
> application a few years ago and had VERY few failures, and when we did, they
> were readily available local to the unit being used. They have a multitude
> of mounts so they should be easy to integrate into the shack. That's the
> route I plan to take, that is if the relay pulls less than 500 mills, hi.
> 73,
> Don, WB5HAK
>
> ______________________________________________________________
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>
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