[Elecraft] KXP-100/KX-3 integration

[n4cw at aol.com]

 To counter the voltage drops on my "portable" battery systems, I always use an N8XJK booster. At the very end of its capacity  (a weekend of mobile state QSO party activity with a K3), the booster and K3 shut down due to minimum voltage required. Works great...I get full output from the rig. The same applies to KX3/KXPA-100.Bert, N4CW/K1IMI
   On Tuesday, July 8, 2025 at 04:59:15 PM EDT, Ken Bandy via Elecraft <elecraft at mailman.qth.net> wrote:   

 Voltage drop with Bioenno (or any LiFePO4 battery) is much less that AGM chemistry.  I normally see a minimum of 12.8 or 12.9 volts, under load, until the "bitter end".  Then it's a quick decline.

73,
Ken, KJ9B
________________________________
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> on behalf of Bob Stephens AF9W via Elecraft <elecraft at mailman.qth.net>
Sent: Tuesday, July 8, 2025 12:13 PM
To: elecraft at mailman.qth.net <elecraft at mailman.qth.net>
Subject: [Elecraft] KXP-100/KX-3 integration

A consideration with the KXPA100 is that it requires a minimum of 13.8 volts to get 100w out.  As the voltage drops below that amount, the output drops also.  I owned one for 10 years and it didn't like operating from AGM batteries.  At 12.6 volts I got around 80w.  When running it as my base station, I set the power supply to 14.2 volts to maintain the 13.8 with the voltage drop across the power supply cable while transmitting.


Message: 6

Date: Tue, 8 Jul 2025 01:59:42 +0000 (UTC)

From: mjrosen <mjrosen at cox.net<mailto:mjrosen at cox.net>>

To: <Elecraft at mailman.qth.net<mailto:Elecraft at mailman.qth.net>>

Subject: [Elecraft] KXP-100/KX-3 integration

Message-ID: <1749158500.1143383.1751939982285 at mail.yahoo.com<mailto:1749158500.1143383.1751939982285 at mail.yahoo.com>>

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I have the?KX-3. Considering adding the 100W amplifier which will only be used in the field. Not SOTA or hiking, car trips for POTA and, vacation use. I have a 20AH Bioenno battery that more than adequately powers KX-3 at 10-15W for QRP activations. I've considered 2 options: 1. Geta a higher capacity battery and run both radio and amp from one battery (think the 20AH will do?)?via the parallel power pole connection on the amp or 2. Just getting a separate battery for the amp. what are other folks' set ups? I seldom?on the air for more than 4 hours as the family/ spouse?looses patience. Thanks, Marc KM7AZ





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Bob AF9W

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