Re: K3 and Expert 1.3K-FA amplifier power

Posted by Igor Sokolov-2 on Sep 12, 2017; 3:10am
URL: http://elecraft.85.s1.nabble.com/K3-and-Expert-1-3K-FA-amplifier-power-tp7634331p7634370.html

I have the same setup here and drive the amp with 5-7 W from K3 to 1 Kw
with MEDIUM setting of the amp.

The amp shows input power very close to that set on K3. My amp is EU
version and it would switch overdrive protection ON if input exceeds 20W.

Check if TUNE POWER of your K3 set to NORMAL if you do your measurements
in TUNE mode.


73, Igor UA9CDC


11.09.2017 2:10, Bill Frantz пишет:

> I have just set up an Expert 1.3K-FA amplifier with my K3 (with most
> of the upgrades to become a K3S). My question is, when I drive it with
> 10W set on the K3 output power, it shows a drive level of about 30W
> and and output level of 950W. What is going on?
>
> Details: The two boxes are connected with about 6' of RG-58 for the RF
> and a custom cable made by KC5PCB, Dan Tassell for the rest of the
> signals. The output is into a dummy load, although very similar
> measurements occur with my trapped vertical antenna. Tests were in the
> CW portion of the 20M band.
>
> The Amp is powered from a dedicated 120V circuit which shows a 7 volt
> drop at 12.7A during CW key down transmission. (Voltage is measured by
> a Fluke 87 DVM and current by a Kill-A-Watt PA4400.) An external YS-60
> power meter shows 800W, which seems reasonable agreement given the
> accuracy of RF power measurements.
>
> Why does the K3 show 10W and the amp show 30W? Is there something
> screwy here, or is it normal?
>
> 73 Bill AE6JV
>
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