K3 -> Very Early Acom 2000A

[William Liporace - WC2L]

Hi Folks,
I am looking for instructions of tips on how to hook up the very early
Acom 2000A amps to my K3. Any tips or tricks would be great!!

TNX Will WC2L

--
William Liporace WC2L
http://www.wc2l.com or http://dxc.wc2l.com
AR-Cluster Node  telnet dxc.wc2l.com or 144.93 MHz
[hidden email]

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[Chuck - AE4CW]

In addition to a coax connection, the simplest approach is to hook up a key line from the Key Out on the K3 to the Key In on the Acom 2000A.  Then, simply use a single "dit" (enable SSB+CW in the CW WGHT menu) to cause the amp to auto-tune on your current frequency.  You can also issue a short vocal sound, and the amp will auto-tune.  There are a few software packages that can listen to the K3 CAT frequency changes and send them to the amp, but I think they are more trouble than they are worth; it also requires a "special" serial cable.  You should also set your K3 tune power to 15 watts which is what the 2000A expect if you wish to set a customize tuning solution for a particular band segment.

That's all you need to be up and running.

P.S. The new 2000A Remote Control Unit can connect directly to the K3 to listen for frequency changes and automatically retune the amp for the new band segment (no SW needed).
---
Chuck, AE4CW

-----Original Message-----
From: William Liporace <[hidden email]>
Sent: Sunday, July 08, 2018 02:13:PM
To: [hidden email]
Subject: [Elecraft] K3 -> Very Early Acom 2000A

Hi Folks,
I am looking for instructions of tips on how to hook up the very early Acom 2000A amps to my K3. Any tips or tricks would be great!!

TNX Will WC2L

--
William Liporace WC2L
http://www.wc2l.com or http://dxc.wc2l.com AR-Cluster Node  telnet dxc.wc2l.com or 144.93 MHz [hidden email]



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[wc1m]

Hi Will,

I have an early 2000A driven by a K3. I'm pretty sure you can just connect the Key Out jack on the K3 to the Key In jack on the 2000A, and the hard-coded transmit delay in the K3 (5ms?) will be adequate for the vacuum relay in the 2000A to switch.

However, if you want to be 100% safe, or if you get key sequencing faults from the 2000A, you can use the 2000A key loop. This requires connecting the 2000A Key Out jack to the K3 TX INH pin (pin 7) on the Acc jack. Since the 2000A pulls Key Out low when it's OK to transmit, you need to pull pin 7 on the K3 ACC jack  up to 5VDC (max) with a 10K resistor. To do that, you'll have to run a line over to the K3 12VDC jack and use a resistor divider or a transistor circuit to drop it down to 5VDC (the latter is how I did it.)

I've seen a diagram where someone got the 5VDC pullup voltage by shorting pin 1 to pin 7 on the Acc jack. Pin 1 is the FSK input, which is pulled up to 5VDC. I don't know if this works, but it's simpler than what I described above. I'm pretty sure it means you can't use the FSK input.

Once you get the hardware connected, go into Config:TX INH and set INH = Hi. You'll need to be in tech mode to do this.
 
Hope this helps.

73. Dick WC1M


-----Original Message-----
From: William Liporace <[hidden email]>
Sent: Sunday, July 8, 2018 2:13 PM
To: [hidden email]
Subject: [Elecraft] K3 -> Very Early Acom 2000A

Hi Folks,
I am looking for instructions of tips on how to hook up the very early Acom 2000A amps to my K3. Any tips or tricks would be great!!

TNX Will WC2L

--
William Liporace WC2L
http://www.wc2l.com or http://dxc.wc2l.com AR-Cluster Node  telnet dxc.wc2l.com or 144.93 MHz [hidden email]



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[William Liporace - WC2L]

I'm all set.. I may have a couple of questions, but should be good for a
bit.

Will WC2L


On 7/8/2018 2:12 PM, William Liporace wrote:
> Hi Folks,
> I am looking for instructions of tips on how to hook up the very early
> Acom 2000A amps to my K3. Any tips or tricks would be great!!
>
> TNX Will WC2L
>

--
William Liporace WC2L
http://www.wc2l.com or http://dxc.wc2l.com
AR-Cluster Node  telnet dxc.wc2l.com or 144.93 MHz
[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
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