[Elecraft] Extreme QRPp using the KX2, KX3

[Hajo Dezelski]

Hi Bill,

Please explain yourself ...
If it is in the range of a normal OM, I would follow ...

73 de
Hajo dl1sdz

---
Cela est bien dit, mais il faut cultiver notre jardin.

http://hajos-kontrapunkte.blogspot.de/

Dr. William J. Schmidt <bill at wjschmidt.com> schrieb am Sa., 3. März 2018,
23:14:

> Yeah... I didn't wait.  I built my own...
>
>
> Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
>
> Owner - Operator
> Big Signal Ranch – K9ZC
> Staunton, Illinois
>
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> email:  bill at wjschmidt.com
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>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:
> elecraft-bounces at mailman.qth.net] On Behalf Of Hajo Dezelski
> Sent: Saturday, March 3, 2018 3:06 PM
> To: Wayne Burdick <n6kr at elecraft.com>
> Cc: Elecraft Reflector <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] Extreme QRPp using the KX2, KX3
>
> Hi ,
>
> wouldn't it be great if there was an additional sensor for the Wattmeter
> W2 for the Qrp-Guys 1-54 Mhz and 0.01 - 20 Watt?
>
> Who needs a 200 Watt version if you only have the Kx-Line ;-) I really
> would consider buying a qrp-version.
>
> 73 de
>
> Hajo dl1sdz
>
> ---
> Cela est bien dit, mais il faut cultiver notre jardin.
>
>
> http://hajos-kontrapunkte.blogspot.de/
>
>
>
> Wayne Burdick <n6kr at elecraft.com> schrieb am Sa., 3. März 2018 16:49:
>
> > Power output on the KX2, KX3, K3 and K3S can be set as low as 0.1 W
> > directly using the PWR control.
> >
> > However, you can actually set power output to much lower levels (< 1
> > milliwatt), with fine control, by turning off ALC in the menu and
> > adjusting the drive level manually.
> >
> > Here’s the recommended procedure for accurately setting power to
> > levels below 0.1 watt:
> >
> > 1. Connect an external milliwatt meter between the transceiver and the
> > antenna or dummy load. If you don’t have such a meter, you can
> > alternatively connect a dummy load (such as the Elecraft DL2) then use
> > an oscilloscope or an RF voltmeter. (The DL2 includes a rectifier so
> > you can just use a DC voltmeter. The manual for the DL2 provides a
> > translation from DC volts to power level.)
> >
> > 2. For most accurate results, bypass the ATU. This is done in the menu
> > on the KX2 and KX3. The K3/K3S has an ATU switch function on the front
> > panel for this purpose.
> >
> > 3. Start with PWR set to 0.1 W and verify that you hit about this
> > level on the external meter. Hold TUNE to generate a continuous
> > carrier. (This automatically switches to CW mode temporarily, even if
> > you’re using a different mode.) Then exit TUNE by tapping XMIT.
> >
> > Note: The 0.1-W level is not well-calibrated at the rig’s internal
> > wattmeter, because this only forward-biases the rig’s SWR detector
> > diodes by a small amount. Also, the SWR (shown on VFO A) will appear
> > as “--“, because reflected power will be too low to accurately calculate
> it.
> >
> > 5. Go into the menu and turn off TX ALC. This is done using the TX
> > GAIN menu entry on the KX2 (page 41 of the manual) or KX3 (page 49).
> > Use the CONFIG:TX ALC menu entry on the K3 or K3S (approx. page 66).
> >
> > Note: On all of the rigs, the TECH MD menu entry must be set to ON in
> > order to see the TX GAIN or TX ALC menu entries. This is a precaution
> > to make sure such menu settings are not changed unintentionally. On
> > the KX2 and KX3, you also need to UNLOCK the ALC on/off feature as
> > explained in the manual (MENU section).
> >
> > 6. With ALC turned OFF, the PWR control now directly controls the
> > transmit drive level in fine increments. I just tested my lab KX2 and
> > found I could set the power smoothly down to as low as about 1/2
> milliwatt.
> >
> > When you have ALC turned off, the PWR display (on VFO B) will include
> > an asterisk (*) as a reminder. It will not show actual power level for
> > reasons described above. An external metering method will be needed to
> > dial in the desired level.
> >
> > Wayne
> > N6KR
> >
> >
> >
> >
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