Re: [Elecraft] K3: listening to both rcvrs - Reduced receiver noise floor

2008-11-18 Thread David Woolley (E.L)

Tayloe Dan-P26412 wrote:

single composite receiver with a lower noise floor.  If you 
added just enough RF pre-amplification to overcome the signal 
splitting loss to N receivers, adding more and more receivers 


Only if the pre-amplifiers are noiseless, or at least contribute 
equivalent input noise power that is much less than the equivalent power 
generated by the receiver times their gain.  In that case, you could do 
better by using the pre-amp on one receiver and dumping the excess gain 
later in the system.  That's better in noise, but you may compromise 
dynamic range more.


in parallel will produce a composite receiver that has a 
better and better noise floor.  This is in essence what the 
space telescope folks do.  They gang many dishes and many 
receivers together across a very large area to get an 
enhancement on the signal and space noise and a suppression of 
the effective receiver noise contribution.


In this case, there is no splitting loss, and the noise is uncorrelated 
because it is being received at different locations.





--
David Woolley
The Elecraft list is a forum for the discussion of topics related to 
Elecraft products and more general topics related ham radio

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Re: [Elecraft] K3 to Original Facotry Settings?

2008-11-18 Thread Bill W4ZV



paul hendershott wrote:
 
 Can the K3 be re-set back to the original Main Menu/Config settings that
 the K3 arrived with? I have the latest firmware installed. 
 

If you just want to return some CONFIG settings to their defaults, tap METER
while in the specific CONFIG Menu and you will see the default setting in
the display.  For example, while in CONFIG:AGC THR, tap METER and you will
see 5 AGC THRESHOLD.  The number in the   is the default setting.

To do a full reset, see Parameter Initialization on page 61 of the current
manual, and read it *very carefully* because you will need to redo
calibration and firmware setup (unless you SAVE everything beforehand and
then RECALL using the K3 Utility Configuration Menu, which may defeat your
intention to reset everything). 

73,  Bill

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[Elecraft] External Reference

2008-11-18 Thread Phil Theis
Has anyone heard of progress on the external reference feature being 
activated?

thanks
Phil K3TUF
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[Elecraft] RE: K3 Filter Questions

2008-11-18 Thread Joel R. Hallas
Dave,

It is unlikely, but possible that your 250 Hz filter is defective. My
original 400 Hz filter had a center frequency offset beyond the 250 Hz
correction limit (as an 8-pole, supposed to be 0 Hz offset). 

If you can center the signal in another filter's bandbass (use CWT to be
sure) and then switch to the narrow filter and it is no longer there, but
noise is, tune the receiver (first try shifting the DSP) and see if you find
it nearby. If it's way off you may need to configure it as if it were a
wider filter (say 1 kHz) and have the DSP set to 1 kHz, so it will get
through. 

I have had an opportunity to evaluate quite a few K3 filters lately, and
this is the only one I've seen that was obviously off frequency -- in my
personal K3 -- naturally g!

Needless to say, Elecraft replaced the filter immediately and that fixed the
problem.

snip
1. When I turn my 250 Hz filter on in config, and then select that 
filter (which is FL5 here)I can hear noise coming through but no cw 
signals come through. I can see the signals on my PowerSDR/LP-PAN 
setup and CW Skimmer. Signal comes through all the rest of the 
filters O.K. Yes, I opened the radio, and all the filters are installed.
snip

Regards, Joel
Joel R. Hallas, W1ZR

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re: [Elecraft] K3 - How to get more headphone output

2008-11-18 Thread ni0c
In the recent discussions of this subject, I don't recall any mention
of Rx EQ settings, or FLx gain settings as ways of obtaining 
more output.  For CW operation, I'm using +10 dB gain in the 
200 Hz and 400 Hz Rx EQ bands (my CW pitch settings 
are always set between 300 and 400 Hz).  I get plenty of 
headphone volume in my cheap Radio Shack stereo headset 
(especially if I remember to keep the earpiece 
volume controls turned up!)

73,
Chuck  NI0C
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Re: [Elecraft] K3 - How to get more headphone output

2008-11-18 Thread Lyle Johnson

In the recent discussions of this subject, I don't recall any mention
of Rx EQ settings, or FLx gain settings as ways of obtaining
more output...


I don't recommend that you do this, although of course yo can.  When you 
go to 100 Hz or 50 Hz width, the RxEQ is no longer in effect so you'll 
lose this boost.


I'd suggest more sensitive headphones if setting AF Gain to HI doesn't 
give yu the boost you need.


73,

Lyle KK7P
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Re: [Elecraft] K3: listening to both rcvrs - Reduced receiver noise floor

2008-11-18 Thread Jim Brown
On Tue, 18 Nov 2008 08:03:53 +, David Woolley (E.L) wrote:

In this case, there is no splitting loss, and the noise is uncorrelated 
because it is being received at different locations.

It's a risky to assume that ALL RX noise is uncorrelated after being 
detected. While there may be differences in RF level due to antenna 
displacement and transmission line length, the detected audio may be 
correlated if some specific noise source is heard by both receivers. 

In other words, noise can be random or correlated. Examples: an impulse 
noise generated from a power line or hash generated by a swithing power 
supply. While both are broadband sources, they are NOT random. If both 
antennas hear a source like them, the detected audio will be correlated 
between the two receivers! So in that case, there's no advantage from 
combining the two RX outputs. The 3 dB advantage arises when the noise is 
truly random, like the noise preamps that are not common to the two 
receivers. 

73,

Jim Brown K9YC


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RE: [Elecraft] Filter questions

2008-11-18 Thread Jim Brown
On Mon, 17 Nov 2008 14:42:22 -0800, Dick Dievendorff wrote:

Eric Scace, K3NA, is usually worth listening to (or reading) on a lot of
topics; psychoacoustics seem to be of particular interest to Eric. He has an
interesting post on the TopBand Forum on this topic:

http://lists.contesting.com/_topband/2006-11/msg00205.html

As a member of the Acoustical Society, Fellow of the Audio Engineering 
Society, and a student of psychoacoustics (the science of how we hear and 
interpret sound), I can vouch for the wisdom of Eric's advice. I've 
independently given the same advice. 

Someone else noted another good reason for listening to lower pitched CW -- 
hearing loss tends to be greatest at high frequencies! 

73,

Jim K9YC 


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Re: [Elecraft] K3 - How to get more headphone output

2008-11-18 Thread Vic K2VCO

ni0c wrote:

In the recent discussions of this subject, I don't recall any mention
of Rx EQ settings, or FLx gain settings as ways of obtaining 
more output.  For CW operation, I'm using +10 dB gain in the 
200 Hz and 400 Hz Rx EQ bands (my CW pitch settings 
are always set between 300 and 400 Hz).  I get plenty of 
headphone volume in my cheap Radio Shack stereo headset 
(especially if I remember to keep the earpiece 
volume controls turned up!)


You really shouldn't need to increase the filter gains over what is 
necessary to equalize the filters. For example, I have my 2.8 and 1 kHz 
filters set to 0 db, and the 400 Hz one to +4 dB. I verified that this 
was correct by using a steady signal source (an Elecraft XG-1), turning 
the AGC off and using the dBv function to compare the gains.


If you need more headphone volume, first make sure that you have set the 
AF Gain in the CONFIG menu to HIGH. If that doesn't work, something's wrong.


--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Elecraft] For Sale K3/100

2008-11-18 Thread nz6d

With much regret, I am selling my K3. I need to fund some international
travel after the first of the year. Here is what I have under the hood:

Factory assembled K3/100 #330
KAT3 Internal ATU
KTCXO3-1 TCXO
KUSB USB Adapter w/software
KBPF3 General coverage RX bandpass filter
KPCA-F Power cable
KFL3A-2.7k  2.7kHz stock roofing filter
KFL3A-1.8K 1.8kHz 8-pole roofing filter
KFL3A-500 500Hz narrow 5-pole roofing filter
KFL3B-FM FM b/w 8-pole roofing filter
Original box and packing/documentation.
No mic

Current firmware loaded: MCU 2.46 / DSP 1.92,  Oct 3, 2008

Asking $2950.00


Original owner, never an issue (other than user error), never outdoors,
non-smoker.

 I wll ship CONUS. Please only direct e-mail, no list replies.  

73,
Dave – NZ6D
[EMAIL PROTECTED]

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[Elecraft] Making K3 RX audio like K2

2008-11-18 Thread NZ0T

I like the sound of the RX audio of my K2 with the KAF2 filter better than my
K3.  It has less hiss and just sounds better - at least to my crummy ears.. 
I have played around some with the RX equalizer in the K3 and have improved
it some but has anyone had time to really find out what settings will best
mirror the K2 with the KAF2?

Thanks and 73,

Bill NZ0T
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[Elecraft] K2 Transmit Alignment

2008-11-18 Thread Ron McCurdy
I had trouble aligning on all bands with the KPA.  So, I rewound T5 and
found D21 broken and replaced it.  Now, the power is erratic.  I once had
the 2 watts set on 7100 hz and now it won't go above 0.1 watts.  Is there a
way to reset the K2 power output?  I've gone clear back to the beginning and
everything works perfectly until I get to the transmitter alignment.  No, I
don't have the KPA100 connected.

 

Ron, KE5QDA

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Re: [Elecraft] K2 Transmit Alignment

2008-11-18 Thread Don Wilhelm

Ron,

Do you have power output on any band? Try them and see.
The display of 0.1 watts is as low as it will indicate. An indicated 
'output' of 0.1 or 0.2 usually means no power output at all.


Check the other bands and get back with us for further troubleshooting, 
your answer will indicate where to look next. If you do not have power 
output on any band, you will likely need to build the RF Probe from the 
parts provided with your kit (unless you have an oscilloscope with a 10x 
probe).


73,
Don W3FPR


Ron McCurdy wrote:


I had trouble aligning on all bands with the KPA. So, I rewound T5 and 
found D21 broken and replaced it. Now, the power is erratic. I once 
had the 2 watts set on 7100 hz and now it won’t go above 0.1 watts. Is 
there a way to reset the K2 power output? I’ve gone clear back to the 
beginning and everything works perfectly until I get to the 
transmitter alignment. No, I don’t have the KPA100 connected.


Ron, KE5QDA



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Re: [PNWVHFS] Re: [Elecraft] K3 Northwest Workshop Update 17 Nov 2008

2008-11-18 Thread Lance Collister

FOR KK7P:

I have received inquiries from a few additional people in the NW who would like to 
attend, but they do not have Lyle's phone number or email address.  Is there some 
way they can contact you, Lyle?  TNX and 73, Lance


--
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
2m DXCC #11, 6m DXCC #815


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Re: [PNWVHFS] Re: [Elecraft] K3 Northwest Workshop Update 17 Nov 2008

2008-11-18 Thread Eric Swartz - WA6HHQ, Elecraft

[EMAIL PROTECTED]

73,
Eric

Lance Collister wrote:

FOR KK7P:

I have received inquiries from a few additional people in the NW who 
would like to attend, but they do not have Lyle's phone number or 
email address.  Is there some way they can contact you, Lyle?  TNX and 
73, Lance



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[Elecraft] Item for 'Wish list ' maybe

2008-11-18 Thread Bruce Fleming
This is a software option I would like to have. Maybe it is already do-able. If 
so, I hope someone will tell me how. If not, I hope this request will get put 
up on the 'Wish List'.
***
I would like the VFO A display to always show the frequency that the K3 is 
using when operating split.
The VFO A should change to the TX frequency when I key down and jump back to 
the RX frequency when I key up.
Thus, when operating CW on split, the screen would be flickering all the time 
between the two frequencies. 
Subsequently, if I try to have a regular QSO, the flickering would be a 
constant reminder that I have left the split on (split happens!).

I had this feature on my old Icom 735 and I am missing it on the K3.

Thanks in advance for any advice.Bruce KI7VR___
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[Elecraft] FS - K2 #3434

2008-11-18 Thread Greg Storms

I have settled in with my K-3 and see my K2 sitting and gathering dust.

Includes:

K2-100
KSB2
K160RX
KNB2
KAF2
KDSP2
KAT100
QRP top
G3LIV Isoterm cables for data modes

Asking $1,100 for all or make offer.  Will not piece out.

Contact off reflector for more details.

73s

Greg
KD7SRC
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[Elecraft] K3: Item for 'Wish list ' maybe

2008-11-18 Thread David Pratt

In a recent message, Bruce Fleming [EMAIL PROTECTED] wrote ...

***
I would like the VFO A display to always show the frequency that the K3
is using when operating split.
The VFO A should change to the TX frequency when I key down and jump
back to the RX frequency when I key up.
Thus, when operating CW on split, the screen would be flickering all
the time between the two frequencies.
 
I had this feature on my old Icom 735 and I am missing it on the K3.


The K2 does this, Bruce;  it's strange that this does not happen with 
the K3.  I agree it should go on the wish list.


73
--
David G4DMP
Leeds, England, UK
--


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Re: [Elecraft] K3: Item for 'Wish list ' maybe

2008-11-18 Thread Greg - AB7R
The K3 does not do this simply because there is a separate display for both 
VFOs 
and are shown at the same time.  So  you always know what your RX and TX 
frequencies are.  The K2 does this because it does not have a dedicated freq 
display for VFO B.

-
73,
Greg - AB7R
Whidbey Island WA
NA-065


On Tue Nov 18 13:47 , David Pratt  sent:

In a recent message, Bruce Fleming [EMAIL PROTECTED] wrote ...
***
I would like the VFO A display to always show the frequency that the K3
is using when operating split.
The VFO A should change to the TX frequency when I key down and jump
back to the RX frequency when I key up.
Thus, when operating CW on split, the screen would be flickering all
the time between the two frequencies.
 
I had this feature on my old Icom 735 and I am missing it on the K3.

The K2 does this, Bruce;  it's strange that this does not happen with 
the K3.  I agree it should go on the wish list.

73
-- 
David G4DMP
Leeds, England, UK
--


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Re: [Elecraft] K3: Item for 'Wish list ' maybe

2008-11-18 Thread Brian Alsop

Greg,

What you say simply isn't true if one is using text decode or displaying 
other VFO B slot parameters.

73 de Brian/K3KO

Greg - AB7R wrote:

The K3 does not do this simply because there is a separate display for both VFOs 

and are shown at the same time.  So  you always know what your RX and TX 

frequencies are.  The K2 does this because it does not have a dedicated freq 


display for VFO B.



-

73,

Greg - AB7R

Whidbey Island WA

NA-065

 



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Re: [Elecraft] Making K3 RX audio like K2

2008-11-18 Thread Lyle Johnson

Hello Bill!


I like the sound of the RX audio of my K2 with the KAF2 filter better than my
K3.  It has less hiss and just sounds better - at least to my crummy ears.. 
I have played around some with the RX equalizer in the K3 and have improved

it some but has anyone had time to really find out what settings will best
mirror the K2 with the KAF2?


The K3 is a very different radio than the K2, and some of this will be 
reflected in a different character in its sound.


The KAF2 uses analog filters with feedback to provide narrower 
bandwidths, and includes an L/C low pass filter to suppress hiss and 
other high-frequency noises.


In general, the K3 DSP filters are sharper than those of the K2 w/KAF2. 
 One way to get some of the feel might be to use the PB feature in CW 
mode.  This lets you adjust a wider, underlying filter which may restore 
a little of the audio you've become accustomed to in the K2.


If you have exceptional high frequency hearing, you might want to 
consider headphones (or speakers/amplified speakers) with some high 
frequency roll off.


Activation of NR with a setting of F1-1 or F1-2 may also help tailor the 
sound a bit more to that of the K2.


In the end, though, the K3 has its own unique characteristics.  I hope 
you grow to enjoy them as much as you do those of your venerable K2 /KAF2.


73,

Lyle KK7P

(whose K2s are getting very dusty...)

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Re: [Elecraft] Making K3 RX audio like K2

2008-11-18 Thread Lyle Johnson
In general, the K3 DSP filters are sharper than those of the K2 w/KAF2. 
 One way to get some of the feel might be to use the PB feature in CW 


I meant PB2.

Also, be sure to try AFX with stereo headphones.  DLY 3 to DLY 5 can 
make a real difference in the presence of a signal.


Enjoy!

73,

Lyle KK7P
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Re: [Elecraft] K3: Item for 'Wish list ' maybe

2008-11-18 Thread Greg - AB7R
What you say is true enough.  But I think when most people are operating split 
they 
have the VFO B normal display on and not the alternate display.  Of course 
nothing 
like that is true all the time...but I think it is true most of the time.

I like to operate QSK and to me having the VFOA frequency change rapidly while 
sending CW would just drive me bonkersmore so than I already amjust ask 
my 
dog!  :)

-
73,
Greg - AB7R
Whidbey Island WA
NA-065


On Tue Nov 18 15:07 , Brian Alsop  sent:

Greg,

What you say simply isn't true if one is using text decode or displaying 
other VFO B slot parameters.
73 de Brian/K3KO

Greg - AB7R wrote:

The K3 does not do this simply because there is a separate display for both 
VFOs 

and are shown at the same time.  So  you always know what your RX and TX 

frequencies are.  The K2 does this because it does not have a dedicated freq 

display for VFO B.



-

73,

Greg - AB7R

Whidbey Island WA

NA-065

  


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Re: [Elecraft] Making K3 RX audio like K2

2008-11-18 Thread NZ0T

Thanks Lyle, I had not thought of changing the delay on afx which I use all
the time.  I wear hearing aids which may be part of my problem though I take
them off when using headphones.  I'll try PB2 in CW and see how that works. 
Don't get me wrong - the audio od the K3 is excellent just different than my
K2.

Lyle Johnson wrote:
 
 Hello Bill!
 
 I like the sound of the RX audio of my K2 with the KAF2 filter better
 than my
 K3.  It has less hiss and just sounds better - at least to my crummy
 ears.. 
 I have played around some with the RX equalizer in the K3 and have
 improved
 it some but has anyone had time to really find out what settings will
 best
 mirror the K2 with the KAF2?
 
 The K3 is a very different radio than the K2, and some of this will be 
 reflected in a different character in its sound.
 
 The KAF2 uses analog filters with feedback to provide narrower 
 bandwidths, and includes an L/C low pass filter to suppress hiss and 
 other high-frequency noises.
 
 In general, the K3 DSP filters are sharper than those of the K2 w/KAF2. 
   One way to get some of the feel might be to use the PB feature in CW 
 mode.  This lets you adjust a wider, underlying filter which may restore 
 a little of the audio you've become accustomed to in the K2.
 
 If you have exceptional high frequency hearing, you might want to 
 consider headphones (or speakers/amplified speakers) with some high 
 frequency roll off.
 
 Activation of NR with a setting of F1-1 or F1-2 may also help tailor the 
 sound a bit more to that of the K2.
 
 In the end, though, the K3 has its own unique characteristics.  I hope 
 you grow to enjoy them as much as you do those of your venerable K2 /KAF2.
 
 73,
 
 Lyle KK7P
 
 (whose K2s are getting very dusty...)
 
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Re: [Elecraft] K3: Item for 'Wish list ' maybe

2008-11-18 Thread ab2tc

Hi,

Before I bought the K3, I too, was concerned about the fact that the main
(A) VFO display would not change when transmitting with split enabled, but I
am no more. There are a number of indications in the display that I am in
split mode, the delta-F LED is lit, the TX arrow points down to the B VFO
and unless you have an alternate display in the B VFO it will display the
transmit frequency. To have the main (A) display change when transmitting
really only makes sense when there is just one frequency display (which is
what I was used to, too). And I agree with Greg that having it swapping with
each dit on CW would drive me crazy. I also agree that when operating split
it is prudent to have the B display set for the B VFO frequency. 

Knut - AB2TC


Greg - AB7R wrote:
 
 What you say is true enough.  But I think when most people are operating
 split they 
 
 have the VFO B normal display on and not the alternate display.  Of course
 nothing 
 
 like that is true all the time...but I think it is true most of the time.
 
 
 
 I like to operate QSK and to me having the VFOA frequency change rapidly
 while 
 
 sending CW would just drive me bonkersmore so than I already
 amjust ask my 
 
 dog!  :)
 
 snip
 
 


-
AB2TC - Knut
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[Elecraft] K3 Beta firmware rev. 2.67: Main/Sub AF balance control; AGC-off AF limiter

2008-11-18 Thread wayne burdick
K3 beta-test firmware revision 2.67 (with DSP rev 1.96) is now 
available. Please send any problem reports to [EMAIL PROTECTED] 
For instructions on how to load beta firmware, please see:


  http://www.elecraft.com/K3/k3_software.htm

Full details appear below.

73,
Wayne
N6KR

* * *

MCU 2.67 / DSP 1.96, 11-18-2008

* MAIN/SUB BALANCE CONTROL:  If CONFIG:SUB AF is set to BALANCE,
then the SUB AF GAIN control becomes a main/sub AF balance control when
the sub receiver is turned on (including diversity mode). In this case 
the MAIN

AF GAIN controls the AF gain level for both receivers. When SUB AF is at
12 o’ clock, both receivers will be at full volume (main left, sub 
right). If SUB AF
is rotated fully counter-clockwise, you’ll hear only the main receiver. 
If it’s
rotated fully clockwise, you’ll hear only the sub receiver. At 
intermediate settings
you’ll hear both. A BALANCE control is very useful for contesting and 
split
operation. But it can also save a lot of AF gain control tweaking 
(i.e., matching

main and sub), since MAIN AF controls both main and sub receiver audio.

* AGC-OFF AF LIMITER: An adjustable AF output limiter has been added
for operators who turn AGC off. This can protect your ears if a large 
signal
appears. Signals or noise above the threshold will sound highly 
distorted
due to the limiting action, reminding you to back down the AF or RF 
gain.

The associated menu entry, CONFIG:AF LIM, defaults to NOR. Typical
settings for those who often turn AGC off are 17 to 23, but some 
experimentation

will be required.

* EASY SUB RX ANTENNA SWITCHING: A hold of RX ANT will alternate
between MAIN and AUX for the sub receiver’s antenna, if the sub is 
installed.

This is faster than going into BSET to switch the sub antenna.

* SUB ANT SAVED SEPARATELY FOR DIVERSITY/NON-DIVERSITY:
At many stations, the sub receiver’s AUX antenna is only used in 
diversity

mode. The K3 now remembers which sub RX antenna setting you use
in diversity and non-diversity cases, so you won’t have to use BSET as 
often.


* DIGOUT0 SIGNAL (ACC connector): This now behaves as described in the
owner's manual. When a transverter band is selected that is configured 
for

low-power operation (i.e., .01-1.50 mW, and using the KXV3’s XVTR IN/OUT
jacks), DIGOUT0 provides a low-resistance path to ground that could be 
used to
activate a small relay or other circuitry. At all other times the 
DIGOUT0 line
will float (high-Z). If all transverter bands are configured for low 
power, then

DIGOUT0 can be used as a “transverter band selected” signal.

* POWER LEVEL ON XVTR AND HF BANDS: Switching between HF and
transverter bands no longer modifies the present HF band power setting.


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