[Elecraft] Low Power Output on 160 and 6 meters

[Mark Musick]

From the K3S manual dated 2016:

TRANSMITTER *
Output Power K3S/100: 0.1 W –100 W typ. Suggested max from 51-52 MHz, 85 W; 52-54, 70 W.
K3S/10 (or K3S/100 with PA bypassed): 0.1 W –12 W, HF-10 m; 8 W max on 6 m.
XVTR OUT: HF, -10 to +1.8 dBm; at 472 kHz (630 m), -3 dBm (see pg. 41).
K144XV: ~10 W, 144-148 MHz.
Note: K3S/100 output can be set up to 110 W. However, IMD and spurious products
are specified at 100 W, the recommended maximum (lower on 6 m; see above).

I'd say 90 Watts on 6 meters meets the specification.

My K3S puts out 100 Watts on 160 and 93 Watts on 6 (50.125) into a Palstar dummy load.

Mark, WB9CIF

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of John
Sent: Tuesday, June 25, 2019 00:11
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Low Power Output on 160 and 6 meters

Everett, I saw a similar thing when I sent my K3 in for updating.

It came back with an indicated power out of 90 watts max, while

it went in to the shop showing 106 watts max.  It was explained 

me that since it met all specs, 90 watts was good.

I don't like it but that's what I was left with.

73.

John.


On 24/06/2019 3:51 p.m., EVERETT SHARP via Elecraft wrote:
> I have three K3S and over the week-end I connected each of them to my Bird watt meter, with a Dummy load. Each of K3S were updated to the current Firmware and each had the 5 and 50 watt calibrations run.
>
> What I found was all 3 showed from 80 to 90 watts output on 160 meters 
> and on 6  meters I saw 75 to 90 watts. All other bands showed 
> typically
> 105 to 110 watts. However, one of the K3S showed exactly 100 watts on all bands except for the lower power on 160 and 6 meters.
>
> I did check one of the K3S before doing the current Firmware update and saw no difference before and after the up date on 160 and 6 meter power output.
>
> Does anyone have any idea as to why I am seeing the lower outputs on 160 and 6 meters.
>
> Everett N4CY
>
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