KPA-1500 questions and low pass filters

[Peter W2IRT]

Hi all,
Just got my 1500 connected last night and so far so good. I do have two
questions, however. First, is it possible to toggle standby and operate from the
K3s, instead of using either the remote software or physically pressing the
button on the amp? And second, I was under the impression that there was a way
to have separate transmitter powers depending on whether the amp is inline or
not. I normally like to run the full 100W from the K3s, but when I kick the amp
in, I have to drop TX power to ~25 Watts.

Another issue I have involves the feed path. I am using a remote antenna switch
mounted at the tower. At the moment I have all my HF antennas connected through
there, using the Antenna 1 port on the amp (previously on the K3s). Antenna 2 is
for 6m only. I would like to route the 6m antenna from this switchbox as well,
but the problem is the HF output is running through a low-pass filter. Are there
low-pass filters that don't cut off until ~54 MHz?

----------------------------------------------------

Regards,
Peter Dougherty

 

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[Don Butler]

Peter, I’m not completely sure because I have my amp in the shack within reach, but I think you’ll need to switch in and out of standby from the amp itself (unless you’re using remote software) …. But regarding the second question, if you have selected “power per band” from the K3s menu, and if you have the rig and KPA1500 connected with the auxiliary cable, the K3s power settings will follow the oper/stby selection on the amplifier…. And will be specific for each band.   When you switch into standby, the K3s will switch to the barefoot power of your choice (100W in your case) …. When you switch to operate, the K3s will drop to the drive power that had been selected the last time you used the amplifier on that band.

Don, N5LZ

Sent from Mail for Windows 10

From: Peter W2IRT
Sent: Tuesday, August 21, 2018 11:29 AM
To: [hidden email]
Subject: [Elecraft] KPA-1500 questions and low pass filters

Hi all,
Just got my 1500 connected last night and so far so good. I do have two
questions, however. First, is it possible to toggle standby and operate from the
K3s, instead of using either the remote software or physically pressing the
button on the amp? And second, I was under the impression that there was a way
to have separate transmitter powers depending on whether the amp is inline or
not. I normally like to run the full 100W from the K3s, but when I kick the amp
in, I have to drop TX power to ~25 Watts.

Another issue I have involves the feed path. I am using a remote antenna switch
mounted at the tower. At the moment I have all my HF antennas connected through
there, using the Antenna 1 port on the amp (previously on the K3s). Antenna 2 is
for 6m only. I would like to route the 6m antenna from this switchbox as well,
but the problem is the HF output is running through a low-pass filter. Are there
low-pass filters that don't cut off until ~54 MHz?

----------------------------------------------------

Regards,
Peter Dougherty

 

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[Hisashi T Fujinaka]

I had similar questions.

Use a cable with RCA jacks to connect the K3/K3S rear panel 12V DC OUT
RCA connector to the KPA1500 REM RCA connector to wake it up. You'll
still need something to change OPERATE/STANDBY on the KPA1500, but I
just use the KPA1500 utility over Ethernet.

The power output on your K3/K3S will be different when you have the amp
in OPERATE or STANDBY.

On Tue, 21 Aug 2018, Peter W2IRT wrote:

> Hi all,
> Just got my 1500 connected last night and so far so good. I do have two
> questions, however. First, is it possible to toggle standby and operate from the
> K3s, instead of using either the remote software or physically pressing the
> button on the amp? And second, I was under the impression that there was a way
> to have separate transmitter powers depending on whether the amp is inline or
> not. I normally like to run the full 100W from the K3s, but when I kick the amp
> in, I have to drop TX power to ~25 Watts.
>
> Another issue I have involves the feed path. I am using a remote antenna switch
> mounted at the tower. At the moment I have all my HF antennas connected through
> there, using the Antenna 1 port on the amp (previously on the K3s). Antenna 2 is
> for 6m only. I would like to route the 6m antenna from this switchbox as well,
> but the problem is the HF output is running through a low-pass filter. Are there
> low-pass filters that don't cut off until ~54 MHz?
>
> ----------------------------------------------------
>
> Regards,
> Peter Dougherty
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

--
Hisashi T Fujinaka - [hidden email]
BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee
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