Elecraft

Re: Elecraft Digest, Vol 193, Issue 35

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Warren Merkel

Re: Elecraft Digest, Vol 193, Issue 35

I definitely wouldn't bother to modify the KPA1500 to have a monitor loop!

I bought two sensors -- one between the K3 and the KPA1500, and the
other between the amplifer output and the antenna feedline. The
LP500/LP700 supports up to four sensors.

This allows easy swapping from exciter output to amplifier output with a
button press, and allows amplifier linearity monitoring using the LP700.

Warren, KD4Z

On 5/20/2020 11:38 AM, [hidden email] wrote:

>
> I am thinking about adding a Telepost LP700 to my station but I would need
> to insert it between the amp and tuner (which are integrated together in the
> KPA1500).
>
> Any ideas if it is worth doing something to loop the RF out of the amp to
> the coupler and back in again? Probably no easy way to do it.
>
>
>
> Just a thought.
>
>
>
> Dave wo2x

Dave wo2x

Re: Elecraft Digest, Vol 193, Issue 35

That is fine for resonant antennas but I would like to monitor between the
amp and tuner.

I know the amp has a sample out port for adaptive predistortion. I had
changed the two small (very small) resistors on the filter board to adjust
the sample out level to work with an Anan radio with no attenuation. I
believe the new amps are shipping with this mod already done.

Too bad the sample out couldn't be used on the LP700...

Dave wo2x

-----Original Message-----
From: [hidden email] <[hidden email]> On
Behalf Of Warren Merkel
Sent: Wednesday, May 20, 2020 12:47 PM
To: [hidden email]
Subject: Re: [Elecraft] Elecraft Digest, Vol 193, Issue 35

I definitely wouldn't bother to modify the KPA1500 to have a monitor loop!

I bought two sensors -- one between the K3 and the KPA1500, and the other
between the amplifer output and the antenna feedline. The
LP500/LP700 supports up to four sensors.

This allows easy swapping from exciter output to amplifier output with a
button press, and allows amplifier linearity monitoring using the LP700.

Warren, KD4Z

On 5/20/2020 11:38 AM, [hidden email] wrote:

>
> I am thinking about adding a Telepost LP700 to my station but I would
> need to insert it between the amp and tuner (which are integrated
> together in the KPA1500).
>
> Any ideas if it is worth doing something to loop the RF out of the amp
> to the coupler and back in again? Probably no easy way to do it.
>
>
>
> Just a thought.
>
>
>
> Dave wo2x

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