[Elecraft] AL-811H Amp and K3

[Allan Bacon]

To confirm what I think you are saying here is?

RCA plug on a wire from the K3 KEY OUT (RCA/Phono) to the RELAY RCA on the Amp ?

Thus keying the K3, also keys the amp?

73,
Al
W6GBG


----- Original Message ----
From: NZ0T <NZ0T at cox.net>
To: elecraft at mailman.qth.net
Sent: Monday, October 13, 2008 8:50:40 AM
Subject: Re: [Elecraft] AL-811H Amp and K3


David,

I run the Al-811 (3 tubes otherwise the same as the 811H) with my K3 and
interface is very easy.  There is no need to use ALC just adjust the K3
power output so you are not overdriving the amp.  With my setup that's
around 60- 70 watts out.  You just need a simple cable with RCA plugs as the
keying line and you are good to go.

GL and 73,

Buill NZ0T


David Wilburn wrote:
> 
> I will be picking up an AL-811H soon.  I was first licensed in 2001 
> and I have never had an amp.  The 811 requires a 15ms delay, and I 
> noticed that the firmware now supports up to a 20ms delay, so I should 
> be good there.
> 
> The 811 documentation talks quite a bit about the use of ALC, and the 
> K3 documentation talks quite a bit about NOT using ALC.  I'm not sure 
> where to go with this.  Anyone using a K3 with an 811?  Do I need to 
> use ALC with it?
> 
> I am trying to get everything ready for the upcoming contests, so 
> timing is becoming an issue.
> 
> The current manual says to see the website to see if you need the mod 
> kit.  The website says to see the mod kit manual, to see if you need 
> to the mod kit.  The manual does not say anything about how to 
> determine if you need the mod kit, so I assume that if -12v ALC is 
> needed, the mod needs to be done.  Is this correct?
> 
> I do not see any mention in the K3 documentation about connecting to 
> amps. It looks like the key out is used to key the amp.  The manual 
> says up to 200v DC @ 5A.  The 811 documentation only mentions 12v, and 
> gets grounded for keying the amp.  Do I need any other devices inline 
> for keying the amp?
> -- 
> 
> David Wilburn
> NM4M
> http://www.nm4m.com
> K2 - S/N 5982
> K3 - S/N 766
> Latest Firmware
> 
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