[Elecraft] Extreme QRPp using the KX2, KX3

[Dr. William J. Schmidt]

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Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ 

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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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