date:20170427

[Elecraft] New KX3 firmware also improves AF gain & monitor control granularity

2017-04-27 Thread Wayne Burdick

This revision also improves the granularity of the AF gain and monitor level 
controls. Steps at the low end are about half the size as before.

73,
Wayne
N6KR


> On Apr 27, 2017, at 8:38 PM, Wayne Burdick  wrote:
> 
> Hi all,
> 
> Rev. 2.70 KX3 firmware unintentionally reduced the max AF gain setting for 
> both speaker and headphones. (We improved the granularity of the AF GAIN 
> control at the low end but didn’t get around to scaling the high end back up 
> to the original level.)
> 
> If you were affected by this and would like to try the field test release 
> (rev. 2.76), please email me directly. 
> 
> This rev also includes the new “ATU DATA” menu entry, which gives you two 
> full sets of per-band ATU data for use when running the KX3 “barefoot” 
> (without the KXPA100/KXAT100). Typically one set would be used at home, the 
> other in the field. If you do a lot of outings, this can save you the trouble 
> of re-matching all of your antennas when you get home. Another use for this 
> is with two different antennas for a given band.
> 
> 73,
> Wayne
> N6KR
> 
> 

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Re: [Elecraft] Experiences using a portable HF loop

2017-04-27 Thread WD4SDC

Last post didn't go thru...trying again...

I've had good results using LMR400 (outer conductor) and an air dielectric
tuning cap which will handle the 10-15W power of a KX3. In some informal
testing comparing a 6 foot diameter loop and a 1/4 wave wire antenna (40
meters) using a car chassis as a counterpoise, the loop beat the wire by 5dB
(NVIS path) (C/N on spectral display).

How efficient is the loop? I don't know - not as efficient as a 4" diameter
copper pipe 6 foot loop, but I do know it's relative ;)

A mobile whip is *very* inefficient. The loop in this case is generally
*less* inefficient :)
You can make contacts on both.

K4HKX did a very detailed comparison of loop antennas with full dipoles and
other HF antennas. He posted his results here:

qrz.com/db/k4hkx

Very interesting read.

I'm playing around with a mobile loop idea for 80 and 40 meters using the
KX3. If it works as good as I think it will, it should give me about the
same performance as adding a KXPA100 - or not... that's why playing with ham
radio is fun.

73's
Steve
WD4SDC

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[Elecraft] New KX3 firmware available that restores original AF gain level

2017-04-27 Thread Wayne Burdick

Hi all,

Rev. 2.70 KX3 firmware unintentionally reduced the max AF gain setting for both 
speaker and headphones. (We improved the granularity of the AF GAIN control at 
the low end but didn’t get around to scaling the high end back up to the 
original level.)

If you were affected by this and would like to try the field test release (rev. 
2.76), please email me directly. 

This rev also includes the new “ATU DATA” menu entry, which gives you two full 
sets of per-band ATU data for use when running the KX3 “barefoot” (without the 
KXPA100/KXAT100). Typically one set would be used at home, the other in the 
field. If you do a lot of outings, this can save you the trouble of re-matching 
all of your antennas when you get home. Another use for this is with two 
different antennas for a given band.

73,
Wayne
N6KR


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