date:20120909

Ken,

ERR TXF is Transmit Filter.  Make certain you have selected the 2.7 or 
2.8 kHz filter for transmit in both CW and SSB.

73,
Don W3FPR

On 9/9/2012 5:53 AM, Ken Dailey wrote:
 I'm just building a new K3, and have come to the point of performing the TX 
 Gain Calibration.  I have the K3 hooked up to the iMac via a KUSB, and the 
 two are talking to each other fine.  However when I run the 5W gain cal, I 
 get this failure message :

 Elecraft K3 Utility for OS X Version 1.12.3.28B
 OS X Version 10.7.4 (Lion)
 K3 MCU version 04.51. RS-232 speed 9600 bps.
 Starting 5 watt calibration.
 Calibrating at 1.900 MHz
 IsSamplingComplete: Unexpected response 'DS1∞IÄÄ;' to 'DS;'. State 220
 Calibration power settled at 'ERR TXF;'
 5 watt calibration failed.
 Elapsed time: 6.6 secs

 Anyone have any ideas what the problem is?

 Thanks,

 Ken, G0RVH


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[Elecraft] KX3 VFO Encoder and a Post Script

2012-09-09 Thread Joel Black

Before I email Elecraft support, has anyone noticed any side-to-side 
play in their KX3 VFO encoder?  I noticed it this morning while tuning 
around listening to the WES.  Yes, I tried tightening the nut holding 
the encoder - it was not loose.  It is the shaft itself.

If it's normal, I'm not worried about it.

73/72,
Joel - W4JBB
SKCC #9512
NAQCC #6128

PS:  When adjusting anything in the shack, make sure your (+) power lead 
does not come into contact with the chassis of the radio. That'll wake 
you up like no coffee can.  :)  Luckily, nothing was damaged and the PS 
only required a hard reset.
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[Elecraft] KX3 is sold.

2012-09-09 Thread NZ8J

The KX3 I offered for sale has been sold, Thanks to all
73
Tim
NZ8J
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Re: [Elecraft] [K3] Keyer Pause

2012-09-09 Thread Mike

I wasn't sure where the link was going 'til I realized it was morse x.

Nice article.

73, Mike NF4L

On 9/9/12 1:40 AM, Dick Wiltgen wrote:
 I was discussing this with Marshall Emm, N1FN.  He graciously shared a link
 to something that he wrote on the subject of keyer contacts and
 conductivity.  To me, it seems to definitively address the issue.  He is an
 excellent writer and I'll let him speak for himself:

 http://www.morsex.com/pubs/fn1011.pdf

 Vy 73 to all
 de Dick, K8RBW



 --
 View this message in context: 
 http://elecraft.365791.n2.nabble.com/K3-Keyer-Pause-tp7562115p7562307.html
 Sent from the Elecraft mailing list archive at Nabble.com.
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[Elecraft] Hello

2012-09-09 Thread Norman Sharples

what is the procedure to use the voice recorder

 
Regards from Norman
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Re: [Elecraft] Hello

If you are asking about the KX3 DVR, look at the errata sheet - it is 
not yet implemented.
If you are asking about the K3, then look at the KDVR3 instructions.

Many will appreciate it if you put the relevant Elecraft product in the 
subject line.  There are many products and some have setup filters based 
on that product information.

73,
Don W3FPR

On 9/9/2012 9:19 AM, Norman Sharples wrote:
 what is the procedure to use the voice recorder



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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread hawley, charles j jr

Which begs the question...why isn't a 100K across the antenna jack in the 
original design?
BTW, I use a choke across the antenna leads.

Chuck, KE9UW
aka Jack, BMW Motorcycles BMWMOA #224


From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] on 
behalf of Fred Jensen [k6...@foothill.net]
Sent: Saturday, September 08, 2012 10:16 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?

Don is totally right.  But, cutting to the chase, put a 100K resistor
across your coax before it gets to the receiver.  Easy, no RX mods, just
put a 100K resistor ... 1/2W will do fine ... into a PL259.  Put a UHF
T-connector on your radio, put the antenna on one leg, put your
resistive PL259 on the other.

Trust me, you *CAN* fry the input stages to your radio and it won't even
look like you're doing it as you are.  Been there -- done that, more
than once, we all learn slowly. :-)  No bleed = charge builds up in the
input capacitance, it will eventually take something out.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org

On 9/8/2012 8:03 PM, Don Wilhelm wrote:
 OK a bit of explanation is in order.  The K2 (and K3 as well as the K1)
 control power based on measuring the actual output power and adjusting
 the drive to provide the requested power level.  That means a device
 capable of measuring the RF output is necessary.
 Well, that is the wattmeter in the KPA100 - it uses Schotky 1N5711
 diodes because those have been chosen to provide the best response with
 respect to frequency and power level.

 Yes, those diodes are a bit tender with respect to static.  Those
 diodes live right at the antenna terminals and are quite susceptible to
 static charges.  The K2 (K3) power control system will give you the most
 consistent power control (because it is a closed loop), but to operate,
 it must be able to measure the output power. and the diodes that do that
 task are susceptible to static discharges.

 Yes, go out and find yourself some resistors between 22k and 100k and
 connect them across your feedlines.

 Note that I do not care about the path to (earth) ground - while that
 may be nice, IMHO it will not help with the equipment damage from
 antenna induced static charges.  Yes, the station should be connected to
 earth ground, but for purposes of lightning protection rather than
 static discharges from antennas.

 There are 3 grounds in a ham station - AC safety ground (see NEC
 requirements), Lightning safety grounding (see Ron Block's papers at
 Polyphaser,.com) and RF ground.  The RF ground is the most elusive,
 because it does not include any hard connection to mother earth.
 Ground in this sense is a point of commonality, or a point where the
 RF voltage is zero.  That condition occurs at the feedpoint of a
 balanced antenna - the zero voltage point directly between the feedpoint
 terminals.

 OK, I am mixing a bit of the theoretical and the practical, but take to
 heart, it is not hard.  When the wavefront moves from the feedline into
 the antenna, the conditions change from conduction (obeying Kirchoff's
 laws)  to radiation (obeying Maxwell's wave equations). Where the
 transition point occurs is indeed a mystery.

 That has nothing to do with the ground question..  Everything needs to
 have a return path, and I believe that is valid for RF as well as for DC
 conditions.  This is the Kirchoff stance,, but there are those who argue
 than the Maxwellian equations offer a better explanation.  That  may be
 true, but there is little difference.

 My goal is not to solve this inconsistency, but just to add a bit more
 information (OK, to justify my conclusions be they right or wrong).

 73,
 Don W3FPR

 On 9/8/2012 10:07 PM, stan levandowski wrote:
 Thanks, Don.  I have a homebrew doublet with a gas discharge center
 insulator and I have been under the (apparently incorrect) assumption
 that I've been well protected from static buildup.  I've also got a
 coaxial switch which is dialed into the dummy load when not in use.

 Guess, I better go out and buy a 22K resistor now and fnish the job ;)

 Appreciate the tip.

 73, Stan WB2LQF


 On Sat, Sep 8, 2012 at 9:17 PM, Don Wilhelm wrote:



 The Gas discharge tubes are effective against large charges - the
 ones I have will squelch a voltage in excess of 600 volts, but below
 that level, they will do nothing.  That 600 volt surge is enough to
 take out the diodes in the K2 KPA100.  The K3 has more protection.
 but still should not be trusted when it comes to static charges.



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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread stan levandowski

Short but interesting demo of antenna static discharge - good motivation 
-  http://www.youtube.com/watch?v=hlSpZ-ffacA  - (BTW, I've heard the 
FT-817 has a 22K resistor installed but don't know that for sure)
On Sun, Sep 9, 2012 at 9:28 AM, hawley, charles j jr wrote:

 Which begs the question...why isn't a 100K across the antenna jack in 
 the original design?
 BTW, I use a choke across the antenna leads.

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Re: [Elecraft] K3: 5W TX Gain Cal Failure ...

2012-09-09 Thread Ken Dailey

Thanks Bob and Don (Don that's two I owe, you helped me in the past on my K2 
build :-) - I had FL5 selected instead of FL1 (2.8), which would explain things 
(FL5=250Hz).  5W Cal now completed successfully.

Thanks!

Ken, G0RVH

--
Ken Dailey

On 9 Sep 2012, at 13:34, Bob Wolbert, K6XX wrote:

 Your transmit filter is not configured correctly. Look at the 2.7 ( or 2.8) 
 filter. Is it enabled for CW transmit?
 
 73 de Bob, K6XX
 
 On Sep 9, 2012, at 2:53 AM, Ken Dailey ken.dai...@mac.com wrote:
 
 I'm just building a new K3, and have come to the point of performing the TX 
 Gain Calibration.  I have the K3 hooked up to the iMac via a KUSB, and the 
 two are talking to each other fine.  However when I run the 5W gain cal, I 
 get this failure message :
 
 Elecraft K3 Utility for OS X Version 1.12.3.28B
 OS X Version 10.7.4 (Lion)
 K3 MCU version 04.51. RS-232 speed 9600 bps.
 Starting 5 watt calibration.
 Calibrating at 1.900 MHz
 IsSamplingComplete: Unexpected response 'DS1∞IÄÄ;' to 'DS;'. State 220
 Calibration power settled at 'ERR TXF;'
 5 watt calibration failed.
 Elapsed time: 6.6 secs
 
 Anyone have any ideas what the problem is?
 
 Thanks,
 
 Ken, G0RVH
 
 --
 Ken Dailey
 
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Re: [Elecraft] Antenna static charge precautions - any tips?

Many antenna systems do not require this protection. They are shunt fed
which provides a direct-current short across the feed line at all times.

Chokes may work fine, but all chokes have some parasitic capacitance across
the windings which means they have a series resonances somewhere across the
RF spectrum. At those points the choke will greatly disturb the impedance
presented to the rig and absorb RF, even to the point of catching fire! 

73, Ron AC7AC

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of hawley, charles j jr
Sent: Sunday, September 09, 2012 6:29 AM
To: k6...@foothill.net; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?

Which begs the question...why isn't a 100K across the antenna jack in the
original design?
BTW, I use a choke across the antenna leads.

Chuck, KE9UW
aka Jack, BMW Motorcycles BMWMOA #224

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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread hawley, charles j jr

I'll keep an eye on it :)

Sent from my iPhone

On Sep 9, 2012, at 10:53 AM, Ron D'Eau Claire r...@cobi.biz wrote:

 Many antenna systems do not require this protection. They are shunt fed
 which provides a direct-current short across the feed line at all times.
 
 Chokes may work fine, but all chokes have some parasitic capacitance across
 the windings which means they have a series resonances somewhere across the
 RF spectrum. At those points the choke will greatly disturb the impedance
 presented to the rig and absorb RF, even to the point of catching fire! 
 
 73, Ron AC7AC
 
 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of hawley, charles j jr
 Sent: Sunday, September 09, 2012 6:29 AM
 To: k6...@foothill.net; elecraft@mailman.qth.net
 Subject: Re: [Elecraft] Antenna static charge precautions - any tips?
 
 Which begs the question...why isn't a 100K across the antenna jack in the
 original design?
 BTW, I use a choke across the antenna leads.
 
 Chuck, KE9UW
 aka Jack, BMW Motorcycles BMWMOA #224
 
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Re: [Elecraft] Portable antennas for use in UK

2012-09-09 Thread Ethan Miller K8GU

Dennis,

Here's another vote for a fiberglass pole and wires.  I have a DK9SQ
pole that was imported by N8ET/KangaUS that I have used for many
years.  It's very flexible (both mechanically and operationally) and
you can usually sneak them on an airliner as your personal item.  I
believe that there are a number of suppliers in EU for these poles in
addition to DK9SQ and Spiderbeam.

I also have a homebrew aluminum tubing vertical that has sections
sized to fit in my suitcase (the whole thing breaks down to about
20x3x4 inches and works on 40 meters and up).  It's similar in concept
to the Buddipole/Buddistick but much less expensive and doesn't use
coils.  The disadvantage is that it takes a few minutes to change
bands.  The largest sections are 3/4-inch.  This withstood 60-mph
gusts (before I took it down) the last time I used it.

73,

--Ethan, K8GU/4.

On Sun, Sep 9, 2012 at 6:27 AM, Jon Kåre Hellan hel...@acm.org wrote:
 On 09/08/2012 10:06 PM, Dennis L. Haarsager wrote:
 Just returned from another two weeks in the UK, this time bringing my KX3.
 My wife and I visit her mother in the Borders area of southeastern Scotland
 four (+/-) times a year.  I duplicated Wayne Burdick's kit as closely as
 possible, but it's really a nice weather sort of system and, frankly, I've
 found there isn't a whole heck of a lot of that in Scotland.

   I use a TransWorld antenna here with very good results, and I hear good
 things about the Buddipole.  I'd like to use something like that over there
 and just keep it at my mother-in-law's place so I don't incur extra baggage
 charges and stress about lost luggage.  Given shipping and potential duty
 costs, I'm wondering if there is something portable like the TransWorld or
 Buddipole that's made in the UK or perhaps elsewhere in Europe that I could
 acquire and store there between trips.  Can anyone make any suggestions?
 I'm operating mostly 20 and 17 meters these days, but also interested in 30
 and 40 meters.

 You could get a 12m telescopic fiberglass pole from Spiderbeam and use
 whatever wire antenna you want with it. Use it as a center support for
 an inv vee or for a wire vertical. My own crazy balcony antenna is a
 full size vertical for 40m with two radials, can be erected or taken
 down in less than a minute. http://www.ha19.no/la4rt/balcony.jpg. The K3
 tuner is able to tune it on all bands from 80m to 6m, that's when I'm
 lazy. It's also easy to take it down and put up an antenna cut for a
 different band, if you worry about loss or want to use an amp. I
 understand that the tuner in the KX3 is just as versatile as the one in
 the K3.

 Used as a support for an inv vee, don't use the top two or three
 sections. They're too flimsy.

 73
 Jon LA4RT

   By the say, I had no hassles with security with the KX3 either in leaving
 the U.S. at Dulles Airport, or in Paris during two transfers, or in
 Edinburgh.  I did carry my original license and printouts of CEPT
 operations in both English and French in the carrying case, but no one
 asked to see them.

   73,
 Dennis, N7DH/4
 Hillsboro, Virginia
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-- 
http://www.k8gu.com/
Repair.  Re-use.  Re-purpose.  Recycle.
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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Mike Morrow

Ron wrote:

 Many antenna systems do not require this protection. They are shunt fed
 which provides a direct-current short across the feed line at all times.

 Chokes may work fine, but all chokes have some parasitic capacitance across
 the windings which means they have a series resonances somewhere across the
 RF spectrum.

Even in the dark ages, most US WWII military aircraft HF receivers like the
famous BC-348-series were modified to install a 1 Mohm resistor from antenna
terminal to ground to dissipate antenna static.  Static voltage build-up
on wire antennas external to the aircraft in motion could otherwise build up
quite high.  The other approach was using a small neon bulb (NE-2) in place
of the resistor.

Compared to choke or neon bulb, the resistor seems to be the most elegant
solution in terms of simplicity with no detectable adverse consequences.

Chuck wrote:

 Which begs the question...why isn't a 100K across the antenna jack in the
 original design?

Good question...with no known good answer.  :-)

73,
Mike / KK5F

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[Elecraft] [KX3] Question: KX3 and K3 Exclusive-Or ?

Is there a comparison of features in the KX3 that are different (in an improved 
way) then the K3?  And, is there a list of useful features of the K3 that are 
not in the KX3 (ignoring things like power out or current 2-meter ability)?

If anyone has such a list or can provide such information it would be 
appreciated?

73, phil, K7PEH

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[Elecraft] [KX3] Expected 100-watt amplifier for KX3 ?

When the 100-watt amplifier is made available for the KX3 will it include (as 
an option?) a 100-watt ATU?  I presume in the same physical box as the 
amplifier?  Or, would it be a separate box or separate product (different from 
KAT100)?

I am not thinking of an ATU for mobile.  For mobile, I am tuning a screwdriver 
antenna (Hi-Q) to a reasonable SWR (under 1.5).  But, I am curious about 
options available for both portable (with an amplifier) and even base station.  
I know that other available ATUs can be used, it is just that the features and 
form of the Elecraft equipment is nice.

73, phil, K7PEH

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Re: [Elecraft] [KX3] Expected 100-watt amplifier for KX3 ?

2012-09-09 Thread Dick Dievendorff

From http://elecraft.com/KX3/kx3.htm

KXPA100 External 100-Watt Amplifier

Our high-performance KXPA100 home/mobile amplifier seamlessly integrates
with the KX3 as well as other popular 5- to 10-W transceivers. It has its
own internal ATU option (KXAT100) with dual antenna jacks.

73 de Dick, K6KR

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil Hystad
Sent: Sunday, September 09, 2012 9:46 AM
To: Elecraft list
Subject: [Elecraft] [KX3] Expected 100-watt amplifier for KX3 ?

When the 100-watt amplifier is made available for the KX3 will it include
(as an option?) a 100-watt ATU?  I presume in the same physical box as the
amplifier?  Or, would it be a separate box or separate product (different
from KAT100)?

I am not thinking of an ATU for mobile.  For mobile, I am tuning a
screwdriver antenna (Hi-Q) to a reasonable SWR (under 1.5).  But, I am
curious about options available for both portable (with an amplifier) and
even base station.  I know that other available ATUs can be used, it is just
that the features and form of the Elecraft equipment is nice.

73, phil, K7PEH

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Re: [Elecraft] [KX3] Expected 100-watt amplifier for KX3 ?

Dick,

Thanks for the quick reply.  I just (a few moments ago) downloaded the KX3 
brochure and saw that the KXPA100 includes the built in ATU option.  I should 
have read that before asking my question.

73, phil, K7PEH

On Sep 9, 2012, at 9:51 AM, Dick Dievendorff die...@comcast.net wrote:

 From http://elecraft.com/KX3/kx3.htm
 
 KXPA100 External 100-Watt Amplifier
 
 Our high-performance KXPA100 home/mobile amplifier seamlessly integrates
 with the KX3 as well as other popular 5- to 10-W transceivers. It has its
 own internal ATU option (KXAT100) with dual antenna jacks.
 
 73 de Dick, K6KR
 
 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil Hystad
 Sent: Sunday, September 09, 2012 9:46 AM
 To: Elecraft list
 Subject: [Elecraft] [KX3] Expected 100-watt amplifier for KX3 ?
 
 When the 100-watt amplifier is made available for the KX3 will it include
 (as an option?) a 100-watt ATU?  I presume in the same physical box as the
 amplifier?  Or, would it be a separate box or separate product (different
 from KAT100)?
 
 I am not thinking of an ATU for mobile.  For mobile, I am tuning a
 screwdriver antenna (Hi-Q) to a reasonable SWR (under 1.5).  But, I am
 curious about options available for both portable (with an amplifier) and
 even base station.  I know that other available ATUs can be used, it is just
 that the features and form of the Elecraft equipment is nice.
 
 73, phil, K7PEH
 
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[Elecraft] (no subject)

2012-09-09 Thread Bob Cunnings

Check the K3 schematics - there *is* a static bleed resistor at each
antenna input, including the KXV3 Rx Ant In jack.

Gas discharge tubes are also present in the KANT3, KAT3 and KRX3.

Bob NW8L

Which begs the question...why isn't a 100K across the antenna jack in the
original design?
BTW, I use a choke across the antenna leads.

Chuck, KE9UW
aka Jack, BMW Motorcycles BMWMOA #224
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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Bob Cunnings

Check the K3 schematics - there *is* a static bleed resistor at each
antenna input, including the KXV3 Rx Ant In jack.

Gas discharge tubes are also present in the KANT3, KAT3 and KRX3.

Bob NW8L

Which begs the question...why isn't a 100K across the antenna jack in the
original design?
BTW, I use a choke across the antenna leads.

Chuck, KE9UW
aka Jack, BMW Motorcycles BMWMOA #224
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Re: [Elecraft] [KX3] Expected 100-watt amplifier for KX3 ?

2012-09-09 Thread Wayne Burdick

Yes, the KXPA100 will have an optional KXAT100 ATU module with the  
same matching range as the KXAT3 internal tuner. The ATU module will  
fit in the same enclosure. If the KX3 detects that a KXAT100 is in the  
system, it will automatically put the KXAT3 into bypass mode.

73,
Wayne
N6KR


On Sep 9, 2012, at 9:46 AM, Phil Hystad wrote:

 When the 100-watt amplifier is made available for the KX3 will it  
 include (as an option?) a 100-watt ATU?  I presume in the same  
 physical box as the amplifier?  Or, would it be a separate box or  
 separate product (different from KAT100)?

 I am not thinking of an ATU for mobile.  For mobile, I am tuning a  
 screwdriver antenna (Hi-Q) to a reasonable SWR (under 1.5).  But, I  
 am curious about options available for both portable (with an  
 amplifier) and even base station.  I know that other available ATUs  
 can be used, it is just that the features and form of the Elecraft  
 equipment is nice.

 73, phil, K7PEH

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Re: [Elecraft] [KX3] Question: KX3 and K3 Exclusive-Or ?

2012-09-09 Thread Wayne Burdick

Phil Hystad wrote:

 Is there a comparison of features in the KX3 that are different (in  
 an improved way) then the K3?  And, is there a list of useful  
 features of the K3 that are not in the KX3 (ignoring things like  
 power out or current 2-meter ability)?


The KX3 is, generally speaking, a subset of the K3 optimized for  
ultralight, portable operation (1.5 pounds, vs. 9 to 10 pounds for the  
K3). It also adds SDR features, attached keyer paddle, and some  
additional versatility for mobile operation (such as a mic with UP/DN  
buttons, and eventually a mobile mounting bracket).

The K3 adds:

- internal 100 watt PA and ATU options

- narrow crystal roofing filters (down to 200 Hz) for
   outstanding close-in dynamic range in contest conditions

- superhet receiver with very narrow per-ham-band filters
   for the ultimate in out-of-band signal rejection; optional
   SWL-band filter modules for both main and sub

- fully independent sub receiver option with
   performance identical to main receiver, allowing
   monitoring of both TX and RX frequencies simultaneously
   with different modes and bandwidths, and a separate
   antenna input allowing independent band monitoring and
   diversity receive

- full-size front panel with convenient control of
   many additional DSP parameters, etc, and more menu
   entries for customization of operating features

- close integration with the Elecraft K-line (KPA500 amp,
   P3 panadapter, KAT500 ATU)

73,
Wayne
N6KR

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Re: [Elecraft] Antenna static charge precautions - any tips?

Ha, ha!  A simple check is to terminate the TX in a dummy load, then add the
choke and see if the SWR changes significantly on any of the bands where you
might transmit. 

73, Ron AC7AC

-Original Message-
From: hawley, charles j jr [mailto:c-haw...@illinois.edu] 
Sent: Sunday, September 09, 2012 9:04 AM
To: Ron D'Eau Claire
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?

I'll keep an eye on it :)

Sent from my iPhone

On Sep 9, 2012, at 10:53 AM, Ron D'Eau Claire r...@cobi.biz wrote:

 Many antenna systems do not require this protection. They are shunt 
 fed which provides a direct-current short across the feed line at all
times.

 Chokes may work fine, but all chokes have some parasitic capacitance 
 across the windings which means they have a series resonances 
 somewhere across the RF spectrum. At those points the choke will 
 greatly disturb the impedance presented to the rig and absorb RF, even to
the point of catching fire!

 73, Ron AC7AC

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[Elecraft] Fwd: Re: Antenna static charge precautions - any tips?

2012-09-09 Thread Fred Jensen

On 9/9/2012 6:28 AM, hawley, charles j jr wrote:
 Which begs the question...why isn't a 100K across the antenna jack in the 
 original design?
 BTW, I use a choke across the antenna leads.

Disadvantage of a choke is that it can form a resonant circuit with the
capacitance of the antenna/antenna input.  Usually not a problem, but
can be.

And, beware of precip static.  Each individual little noise pulse is a
tiny charge deposited at your antenna input.  Even though it looks like
very low amplitude grass on the baseline of a panadapter, if the
antenna does not have a bleed, each little charge adds to the previous
ones and slowly ratchets up the potential until something [often PIN
diodes in a T-R switch] fry.  We managed to do in two IC-756PRO's at N6A
in the Cal QSO Party during a snowstorm from this effect.

With a combined ham experience of about 160 years on the crew, one would 
think we'd have learned after the first one went. :-)

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org





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[Elecraft] West Mountain COMSPKR Question

2012-09-09 Thread Dave C

Hi all,

I know some folks on here are using the COMSPKRs with Elecrafts so I
thought I would ask a quick question.  I picked up a pair at a hamfest
today to try with my K3 but I must have been half-asleep because I didn't
catch that the power supply was not included.  I need to know what input
voltage it takes.

The rear of the speaker says DC IN and I found a review on e-Ham
saying it took 9VDC in but then I took the speaker apart and the power
connection on the circuit board clearly says AC IN.  So, I'm obviously
confused and don't want to guess at this point.  Couldn't find the answer
on West Mountain's website so thought I would ask here.  Thanks and 73,

Dave
K8JDC
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Re: [Elecraft] West Mountain COMSPKR Question

2012-09-09 Thread Dave C

I got a couple of responses off-list saying they can be run off 12VDC so
that's good enough.  Wanted to let folks know that my question was
answered.  Thanks...

Dave
K8JDC
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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Mike Morrow

Bob wrote:

 Check the K3 schematics - there *is* a static bleed resistor at each
 antenna input, including the KXV3 Rx Ant In jack.

What about the KX3?  There are no published schematics yet, AFAIK.

73,
Mike / KK5F
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Re: [Elecraft] Antenna static charge precautions - any tips?

Why be concerned about whether or not each and every transceiver adds a 
static bleed resistor across the antenna, just bite the bullet and add 
one to each feedline coming into the shack and forget the 
tooth-mashing that comes about wondering where it should be done.  I 
for one feel that it is best done at the antenna feedline rather than 
relying on the transceiver - that way I can connect the antennas to any 
transceiver with no problem.
If you do not have a convenient access point to your feedline center 
conductor, enter the TEE adapter.  solder the resistor into a PL-259 
body, and plug it into one side of the TEE adapter - leave it there for 
all eternity.

73,
Don W3FPR

On 9/9/2012 2:39 PM, Mike Morrow wrote:
 Bob wrote:

 Check the K3 schematics - there *is* a static bleed resistor at each
 antenna input, including the KXV3 Rx Ant In jack.
 What about the KX3?  There are no published schematics yet, AFAIK.

 73,
 Mike / KK5F
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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Phil Townsend

So, the 22k - 100k carbon resistor is not needed and therefore would be 
redundant?

Phil
Santa Fe

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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Mike Morrow

 Why be concerned about whether or not each and every transceiver adds a 
 static bleed resistor across the antenna...

Well...perhaps because the addition of an internal high-ohm static bleed
resistor at *any* radio set's antenna connection is trivial yet very good
engineering practice that has no identifiable adverse effects and that
costs essentially nothing.

That's an 'all-win/no-lose' situation to this electrical engineer's eyes. :-)

YMMV

Mike / KK5F

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Re: [Elecraft] West Mountain COMSPKR Question

2012-09-09 Thread Dave C

One last follow-up.  I tried 12VDC on my speakers and I was blowing 5A
fuses.  I checked with one of the guys who wrote me off-list and he
double-checked his speakers and found they were running on 9VDC.  I tried
9VDC and that is working fine.  Just thought I should correct the earlier
info I posted.  Thanks and sorry for cluttering the list.

Dave
K8JDC
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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Bruce Beford

What Don was trying to express was that if you simply add a resistor to your
own antenna, you don't need to worry/wonder about whether or not it is
included in a particular transceiver. 
 
It may be good engineering practice to add it to a transceiver one is
designing. However, if you do it yourself on your own antenna(s), you don't
need to know or care if was included in the rig by the designer. Of course,
it would be good to insure it is in (or added to) all your own radios, so
that you can connect them to any antenna with some confidence.
 
73,
Bruce, N1RX
 
 
 
 Why be concerned about whether or not each and every transceiver adds a 
 static bleed resistor across the antenna...
 
Well...perhaps because the addition of an internal high-ohm static bleed
resistor at *any* radio set's antenna connection is trivial yet very good
engineering practice that has no identifiable adverse effects and that
costs essentially nothing.
 
That's an 'all-win/no-lose' situation to this electrical engineer's eyes.
:-)
 

 

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Re: [Elecraft] Antenna static charge precautions - any tips?

Phil,

That would be true only under certain conditions
What conditions are you referring to?  Your post was void of any conditions.

73,
Don W3FPR
On 9/9/2012 4:02 PM, Phil Townsend wrote:
 So, the 22k - 100k carbon resistor is not needed and therefore would be 
 redundant?

 Phil
 Santa Fe

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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Phil Townsend

I was glad to see my K3 had the 560k resistors in place.
I checked the KX1 and don't see any installed...
Sooo... looks like its a good idea to place them somewhere in the feedline 
after the antenna switcher...or maybe within the the antenna switcher box.
Really glad this subject came up cause New Mexico has fabulously low humidity!
Anyway I have my PL 259 loaded with a nice Allen Brady 100k 2w resistor ready 
to play.

Phil
Santa Fe




On Sep 9, 2012, at 2:42 PM, Don Wilhelm w3...@embarqmail.com wrot

Phil,

That would be true only under certain conditions
What conditions are you referring to?  Your post was void of any conditions.

73,
Don W3FPR
On 9/9/2012 4:02 PM, Phil Townsend wrote:
 So, the 22k - 100k carbon resistor is not needed and therefore would be 
 redundant?
 
 Phil
 Santa Fe
 
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[Elecraft] WANTED KAT 100-1 or KAT100-2

2012-09-09 Thread W0WFH Bill

I am lookingto buy a used or unbuilt KAT 100-1
OR KAT 100-2, Tell me what you got I pay with
Paypal so quick payment, OH yes I will pay the
3% paypal charge too.
Thank you 73
Bill W0WFH
 
Please don't answer to forum answer direct PLEASE
w0...@yahoo.com or call my cell 573-291-5625 
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Re: [Elecraft] [KX3] Question: KX3 and K3 Exclusive-Or ?

Wayne,

Thanks for the message below.  Actually, I was thinking of more subtle 
differences in features between the two.  I own a K3 and I will definitely be 
buying a KX3 (probably this Fall).  But, I watched a very nice video by Bob 
Nagy (AB5N) on the features of the KX3 
(http://www.youtube.com/watch?v=YlH5iJKpJKkfeature=related) and it appeared 
that there were a number of little things that were not available on the K3.

It could be that they were merely very minor differences due to the way that 
the KX3 panel is different but I thought that there were a few other things 
that were different too.  Now, I can't specifically remember what they were so 
I will have to watch the video again to be more specific.

73, phil, K7PEH


On Sep 9, 2012, at 10:36 AM, Wayne Burdick n...@elecraft.com wrote:

 Phil Hystad wrote:
 
 Is there a comparison of features in the KX3 that are different (in an 
 improved way) then the K3?  And, is there a list of useful features of the 
 K3 that are not in the KX3 (ignoring things like power out or current 
 2-meter ability)?
 
 
 The KX3 is, generally speaking, a subset of the K3 optimized for ultralight, 
 portable operation (1.5 pounds, vs. 9 to 10 pounds for the K3). It also adds 
 SDR features, attached keyer paddle, and some additional versatility for 
 mobile operation (such as a mic with UP/DN buttons, and eventually a mobile 
 mounting bracket).
 
 The K3 adds:
 
 - internal 100 watt PA and ATU options
 
 - narrow crystal roofing filters (down to 200 Hz) for
  outstanding close-in dynamic range in contest conditions
 
 - superhet receiver with very narrow per-ham-band filters
  for the ultimate in out-of-band signal rejection; optional
  SWL-band filter modules for both main and sub
 
 - fully independent sub receiver option with
  performance identical to main receiver, allowing
  monitoring of both TX and RX frequencies simultaneously
  with different modes and bandwidths, and a separate
  antenna input allowing independent band monitoring and
  diversity receive
 
 - full-size front panel with convenient control of
  many additional DSP parameters, etc, and more menu
  entries for customization of operating features
 
 - close integration with the Elecraft K-line (KPA500 amp,
  P3 panadapter, KAT500 ATU)
 
 73,
 Wayne
 N6KR
 

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Re: [Elecraft] Antenna static charge precautions - any tips?

Keep in mind that the resistors (or a choke) only provide PARTIAL
protection. If you connect an antenna to the rig that has accumulated a
significant voltage - which can happen in a couple of minutes in dry windy
conditions, in a rainfall, or even during a snowfall, you'll still damage
the rig when you connect it because the voltage won't drop fast enough
through the protection circuit. Not even a choke may protect against that
due to the rapid rise time of the spike.

That's why it's an excellent idea to keep any disconnected antennas grounded
or, if one has been left open, to ground it before connecting it to the rig.


Hopefully less common is a nearby lightening discharge that induces a
current in the antenna. I'm not talking about a direct hit or even anything
close to it. The strike may be some distance away and still induce a
damaging amount of current that the resistor (or choke) cannot bleed off
fast enough. That's another reason to shut down and ground antennas if
lightning can be heard, no matter how far away. 

73, Ron AC7AC 


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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Bill Frantz

It seems to me that with an antenna switch that doesn't short 
the unselected antennas by default, like the DX Engineering 
RR8A-HP remote antenna switch, it might be advisable to either 
set the switch up to short the unselected antennas or add a 
resistor across them individually. Otherwise when an antenna 
carrying a significant static charge is switched to a radio, the 
charge might overwhelming the radio's protective resistors.

Whether dammage would occur depends on the inductance between 
the antenna and the radio's sensitive components. The natural 
inductance of the feed line wiring will broaden the electrical 
pulse and give the radio's resistors more time to bleed off the 
charge. I have no idea if typical feed lines have enough 
inductance to protect a radio in these circumstances.

Cheers - Bill, AE6JV

On 9/9/12 at 14:19, phi...@mac.com (Phil Townsend) wrote:

Sooo... looks like its a good idea to place them somewhere in 
the feedline after the antenna switcher...or maybe within the 
the antenna switcher box.
---
Bill Frantz|Security, like correctness, is| Periwinkle
(408)356-8506  |not an add-on feature. - Attr-| 16345 
Englewood Ave
www.pwpconsult.com |ibuted to Andrew Tanenbaum| Los Gatos, 
CA 95032

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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Vic K2VCO

Which reminds me: I have ICE lightning protectors on my feedlines where they 
come into the 
shack. These have a built-in choke across the side that goes to the antenna, 
which drains 
static charges. See
http://www.arraysolutions.com/Products/surge_arrestorAS-3xx.htm

The only disadvantage of these is that they also have a DC blocking capacitor 
in series 
with the center conductor, which complicates things if you want to inject a DC 
voltage to 
operate a remote switch or tuner.

On 9/9/2012 3:28 PM, Ron D'Eau Claire wrote:
 Keep in mind that the resistors (or a choke) only provide PARTIAL
 protection. If you connect an antenna to the rig that has accumulated a
 significant voltage - which can happen in a couple of minutes in dry windy
 conditions, in a rainfall, or even during a snowfall, you'll still damage
 the rig when you connect it because the voltage won't drop fast enough
 through the protection circuit. Not even a choke may protect against that
 due to the rapid rise time of the spike.

 That's why it's an excellent idea to keep any disconnected antennas grounded
 or, if one has been left open, to ground it before connecting it to the rig.


 Hopefully less common is a nearby lightening discharge that induces a
 current in the antenna. I'm not talking about a direct hit or even anything
 close to it. The strike may be some distance away and still induce a
 damaging amount of current that the resistor (or choke) cannot bleed off
 fast enough. That's another reason to shut down and ground antennas if
 lightning can be heard, no matter how far away.

 73, Ron AC7AC


-- 
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Fresno CA
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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Scott Monks

Hi all;





 From: Bob Cunnings bob.cunni...@gmail.com

Check the K3 schematics - there *is* a static bleed resistor at each
antenna input, including the KXV3 Rx Ant In jack.

Gas discharge tubes are also present in the KANT3, KAT3 and KRX3.

Bob NW8L
I certainly am not an expert at this, but I have a question.

Recently I had to dismantle my antenna (brand name unnecessary) to take out a 
burned gas discharge tube.  I had been operating it on a Warc band for which it 
was not designed, made possible by the efficient tuner of my K3.  I was told 
that the tube might have/probably burned out because it was seeing a high SWR 
that, of course, was not actually corrected at the antenna (just in my radio, 
as expected).

Now, if that was what happened, what is there to keep the same thing from 
happening in my K3?  Obviously, there must be something!

73,
Scott   XE1/AA0AA; AA0AA
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[Elecraft] Regarding K3 close-in phase noise vs. the Kenwood TS-590 and Flex radios

2012-09-09 Thread Wayne Burdick

Phase noise was recently discussed on the K3 Yahoo group, and I  
thought I'd add my two cents. Or maybe three :)

The K3's phase noise at 1 kHz is pretty much state-of-the-art for a  
DDS (direct digital synthesis) reference driving a wide-frequency- 
range, low-noise PLL (phase locked loop). We took things a step  
further by using a very narrow crystal filter after the DDS (about 2.5  
kHz), dramatically cleaning up the DDS even before application to the  
PLL. This forced us to use some pretty hairy math in calculating the  
PLL divider values, but it was worth the effort.

The TS590 (and all currently shipping Flex radios) use a synth  
subsystem that is quite different from the K3's. They use an  
unfiltered DDS as their local oscillator, with no following PLL.

There are some advantages to this design choice. First, and maybe the  
most relevant: it's cheaper than a DDS-driven-PLL overall, requiring  
very few analog parts, essentially no alignment, and far less PCB  
space. Second, such radios might have slightly lower phase noise at  
some very close offset--although at such spacings, other factors such  
as keying bandwidth or IMD typically dominate. Finally, use of a raw  
DDS allows the VFO to switch frequencies rapidly. Such agility might  
be useful for some digital modulation schemes.

However, that raw DDS VFO comes with a price: its output has many  
discrete spurs that can, at specific VFO frequencies, cause ghost  
signals to appear. This is due to mixing between the DDS spurs and  
strong signals appearing anywhere inside the receiver's band-pass  
filter (many MHz in most receivers, but not the K3--more on that  
later). This is true even with the 14-bit DDS word size described in  
the TS590's sales brochure.

The usual way to eliminate these wide-band spurs is to use a PLL to  
clean up the DDS's output. Ironically, that sales brochure I mentioned  
implies that eliminating the PLL was an advantage. Maybe they were  
thinking about reduced manufacturing cost, though this wasn't stated  
explicitly.

(BTW, a typical lab receive mixing test done at just one test  
frequency will not necessarily show this characteristic. To reveal the  
DDS spurs, you'd need to do such a test at many frequencies, moving  
the VFO in very small increments. This is because the spurs are the  
product of multiple digital sampling phenomena; they vary rapidly in  
frequency and amplitude as the DDS's control word is changed. The lack  
of such testing and transparency in the industry could explain why  
mixing spurs are *not* a hot topic of conversation among those  
considering a radio using a raw DDS VFO. Yet, like real ghosts, the  
resulting signals could, nonetheless, sneak up on you :)

It is certainly a lot more expensive to add a high-performance PLL  
into the system--just ask my engineering and manufacturing staff. But  
I guess it depends on what you're trying to optimize. We wanted the K3  
to perform extremely well in crowded band conditions, so we went to  
the trouble to use a DDS-driven-PLL synth. (Or TWO of these synths if  
you have the KRX3 sub receiver installed.) Flex may have elected to go  
with raw DDS because of the need for a very agile VFO for SDR  
applications. Kenwood may have been trying to keep costs low. Both are  
certainly worthy goals.

Actually, we made it even harder on ourselves with the K3. We provide  
narrow band-pass filters on every ham band, painstakingly aligned at  
the factory, ensuring that as little out-of-band energy as possible is  
presented to the mixer in the first place. This makes the synth's job  
a little easier. Yet nearly all other transceivers these days use  
half-octave band-pass filters that are many times the width of the  
ham-band segment. They require no alignment, but they open the radio  
up to more interfering signals. (You can add general-coverage band- 
pass filters to the K3's main and/or sub receivers, of course, by  
adding KBPF3 module. This has no effect on the ham-band performance.)

Note that like the K3, the KX3 uses a DDS-driven PLL synth. The K3 has  
an advantage in temperature stability since it uses a separate  
reference oscillator, but the KX3's phase noise is in the same very  
low range, as evidenced by Sherwood's numbers.

Many other factors besides synth phase noise--including transmit  
signal purity and receiver AGC behavior--also contribute to  
performance in crowded conditions. This is why, some time ago, we  
undertook a major redesign of the K3's AGC subsystem. This resulted in  
excellent field reports from DXpeditions, etc., regarding the dynamics  
of within-filter signals.

I won't go deeply into the SSB transmit purity issue, which has been  
adequately described by others. But I will mention that the K3's TX  
IMD at max power output is as good as or better than that of any other  
12-volt-capable transmitter. And if you run at lower power when  
driving an amp (typically 20-70 W), the IMD numbers are

Re: [Elecraft] KX3 VFO Encoder and a Post Script

2012-09-09 Thread Eric Swartz WA6HHQ - Elecraft

Yes, a small amount is normal on the KX3 encoder. 

Eric

www.elecraft.com
_..._



On Sep 9, 2012, at 5:23 AM, Joel Black w4...@charter.net wrote:

 Before I email Elecraft support, has anyone noticed any side-to-side 
 play in their KX3 VFO encoder?  I noticed it this morning while tuning 
 around listening to the WES.  Yes, I tried tightening the nut holding 
 the encoder - it was not loose.  It is the shaft itself.
 
 If it's normal, I'm not worried about it.
 
 73/72,
 Joel - W4JBB
 SKCC #9512
 NAQCC #6128
 
 PS:  When adjusting anything in the shack, make sure your (+) power lead 
 does not come into contact with the chassis of the radio. That'll wake 
 you up like no coffee can.  :)  Luckily, nothing was damaged and the PS 
 only required a hard reset.
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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread vk4tux

Unusual to see that as an issue withought using an amplifier, however the
high antenna feedpoint impedance on such setups produce a high voltage at
that point, despite the atu proving a 50 ohm impedance match to the
transceiver.

Baluns rated at 3-5 KW are so only at 1:1 swr. When swr raises to 5:1 on
certail bands on a ocf setup then really you should derare the power rating
by the denominator 5, such that a 5KW rating becomes 1KW.
This will provide a long life on ocf setups etc.

Recently I had to dismantle my antenna (brand name unnecessary) to take out
a burned gas discharge tube. I had been operating it on a Warc band for
which it was not designed, made possible by the efficient tuner of my K3. I
was told that the tube might have/probably burned out because it was seeing
a high SWR that, of course, was not actually corrected at the antenna (just
in my radio, as expected).

Now, if that was what happened, what is there to keep the same thing from
happening in my K3? Obviously, there must be something!

73,
Scott XE1/AA0AA; AA0AA

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Re: [Elecraft] K3 Ham Radio Deluxe

2012-09-09 Thread Jimmy Walker

Yes, that's the answer. The problem developed for me today. I consulted the 
archives and found the same answer specified in this response. I had done some 
work on the memory settings earlier in the afternoon. I have no idea how that 
may have changed this setting but it doesn't matter. Changing the CONFIG: VFO 
IND to YES solved the problem for me.


Jimmy Walker
Macon, GA

WA4ILO.com
wa4...@aol.com





-Original Message-
From: Ian Kahn km4ik@gmail.com
To: vk4tux vk4...@bigpond.com
Cc: elecraft elecraft@mailman.qth.net
Sent: Fri, Sep 7, 2012 11:23 pm
Subject: Re: [Elecraft] K3  Ham Radio Deluxe


My CONFIG: VFO IND had been set to No the entire 18 months I've had my
K3.  I had the same problem in the latest version of HRD.  I found, on my
rig, by changing that setting to Yes, then the automatic band switching
when selecting a spot on a different band works perfectly.

73,

--Ian
Ian Kahn, KM4IK
Roswell, GA EM74ua
km4ik@gmail.com
K3 #281, P3 #688
HRD v5.x/6.0 Test Team

On Fri, Sep 7, 2012 at 1:39 AM, vk4tux vk4...@bigpond.com wrote:

 CONFIG:VFO IND = No



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[Elecraft] KPA500 Help

2012-09-09 Thread Anndel

Aloha Everyone,

 

Just finished building the KPA500 kit and it appears to be working (no smoke
and HV voltage withing range).I have the Auxiliary cable connected to
the AUX on my K3 and the key line interrupter since I'm using the Key Out to
control the Telepost LP-100A wattmeter and a Pixel RF Pro 1-B Receive
Antenna.  The key triggers the wattmeter while disabling the Pixel for
transmission to prevent damage to the front end.  When the KPA500 is in
STANDBY (STBY), I can hear stations on the air.  When in OPERATION (OPER),
it seems to mute or attenuate the signal where I can't hear the qsos.  I
went through the manual 3 times but found nothing.  Did I miss or overlook
something?

 

Thanks for your help in advance. 

 

73, Delwyn KH6DC

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Re: [Elecraft] SSTV Reception on the K3

2012-09-09 Thread david Moes

H Mark

I play a fair bit if SSTV  both using analogue and digital.  for 
analogue (Martin, Scottie etc.  DM780 does just fine.  I cant really 
advise on how to implement switching mode for DM780 but Data A would be 
the best choice.  personally I am using MMSSTV  and manually change rig 
modes.  on air I find that DM780 and MMSSTV seem to be both very 
popular. If you are interested in using Digital SSTV (Digital Radio 
Mondale or DRM)  it gets a little more complicated.   I dont think that 
DM780 will do DRM  as  I think this is amost exclusively done using a 
program called EasyPal.   where it gets complicated is the typical QSO 
involves sending pictures and often a comment or conversation on 
frequency with SSB usually talking about the image sent.   for this I 
have a short macro that sends at the begining and end of a image send.   
one macro at the start changes mode to Data A and reduces power to about 
70W.   At the end it changes back to SSB and sets power to 100W.   this 
way the image is sent without compression or EQ.  but then after sending 
a picture I can just pick up the mic and answer to any comments that may 
arise.   for receive I don't have much EQ anyway so SSB is just fine for 
that.

73

Dave Moes VE3DVY




  On 9/8/2012 8:16 PM, pastor...@verizon.net wrote:
 have just discovered that I can use DM780 to receive SSTV. My question would 
 be what mode would I set my K3 to? Would it be Data A or something else? Any 
 help would be very much appreciated. Thanks!! Mark Griffin KB3Z
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[Elecraft] KAP 500 Help PS

2012-09-09 Thread Anndel

PS:  When changing bands manually on the KPA500, it doesn't change to the
corresponding band on the K3.

 

Thanks and 73, Delwyn KH6DC

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[Elecraft] Small got-ya to watch for when doing the K3 12VDC Out Current Mod

2012-09-09 Thread Bob

I set some time aside this weekend to install a second receiver in my K3,
and to perform the 12VDC Out Current Modification since I was adding a SVGA
card to my P3 (which requires more current than the stock 0.5 Amp output).
 My comments pertain to the latter.

Elecraft provides the modification kit with the SVGA card and it is very
easy in concept, requiring the removal of one SMT diode, and two thru-hole
components (a poly-fuse and a choke).  The bulk of the time involved is
strictly mechanical -- removing covers and sub assemblies to provide clean
access to the parts.

It was the mechanical aspect that immediately bit me in the backside.  My
K3 had been lovingly brought to life by the Elecraft factory this January.
 The first step to the modification is to remove the rear half of the
bottom cover.  Easy enough, remove 10 screws.  The instruction warns you
that three of the screws are part of a heat sink assembly which just
requires taking care to not lose the washers and other parts attaching the
LPA power transistors.  However three of the other screws attach to
standoffs that are fastened to the main PCB.  In my case, unscrewing two of
the black pan head screws on the bottom actually caused the hardware
attaching the standoffs to unscrew instead, dropping two screws and washer
inside the radio.  Full stop -- the last thing I wanted to do was flip the
radio over and lose those loose parts.  So I got eyes on the the loose
parts first (as I already had the top cover off for the Aux Receiver
install).

To avoid this, I would recommend taking the Top Cover off first, then using
a screwdriver to tighten down the two screws that are holding the standoffs
to the aluminum L-bracket that holds the PA.  Then I would remove the fan
assembly and PA assembly and tighten the third screw.  The LAST thing I
would do is remove the bottom cover -- while making sure that the L-bracket
screws don't come out (this is the FIRST step in the instruction).

My only other observations is use of a good solder sucker (one with high
vacuum) is probably helpful for removal of the two leaded components --
otherwise cutting the component body off and removing the leads while
heating them might be a good strategy if solder braid is the only available
option to remove the remaining solder.

The modification would have taken about 30 minutes had the standoffs not
come off at the wrong time, and the rework is easy if you have a decent
solder sucker.

73, Bob, WB4SON.
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Re: [Elecraft] Small got-ya to watch for when doing the K3 12VDC Out Current Mod

2012-09-09 Thread vk4tux

I have the kit 12v output mod kit still sitting in the shack draw unfitted,
and have been running the P3SVGA module  first in vk since they started
shipping.

 I have had no issues and run the K3 at 15v. 



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Re: [Elecraft] Using the KX3 to control a remote KX3, K3, or K2 (limited and experimental)

2012-09-09 Thread Gary Slagel

Thanks Wayne and everyone else who sent direct responses.  I am thinking that
I'd use the remote rig boxes if I tried remoting so audio and cw keying
should work as well as the k3/k3 remote.  One of my goals is to do some
remote contesting so the reduced control set and slower rig control may not
fly for that.  But it'll be worth experimenting with and if needed I
should be able to use the same remote rig boxes with a k3 terminal.   I've
got a month or so for delivery of the kx3 so plenty of time for planning. 
Thanks again.



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Re: [Elecraft] Antenna static charge precautions - any tips?

2012-09-09 Thread Mel Farrer

OK, the thread triggered me.  At my station on top of a flat top mesa with a 
180 foot tower and EDZ antennas on 160 and full wave inverted V antennas that 
do not have an DC ground.  I do static discharge a little different.  I use 
open frame relays to do all of the ladder line switching of the individual  
antennas.  But I include a short across the ladder line leads and a earth 
ground when that antenna is not is use.  That way when I switch in a new 
antenna, it is dead earth potential.  Just a thought.  
 
Mel, K6KBE

--- On Sun, 9/9/12, Vic K2VCO k2vco@gmail.com wrote:


From: Vic K2VCO k2vco@gmail.com
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?
To: elecraft@mailman.qth.net
Date: Sunday, September 9, 2012, 3:59 PM


Which reminds me: I have ICE lightning protectors on my feedlines where they 
come into the 
shack. These have a built-in choke across the side that goes to the antenna, 
which drains 
static charges. See
http://www.arraysolutions.com/Products/surge_arrestorAS-3xx.htm

The only disadvantage of these is that they also have a DC blocking capacitor 
in series 
with the center conductor, which complicates things if you want to inject a DC 
voltage to 
operate a remote switch or tuner.

On 9/9/2012 3:28 PM, Ron D'Eau Claire wrote:
 Keep in mind that the resistors (or a choke) only provide PARTIAL
 protection. If you connect an antenna to the rig that has accumulated a
 significant voltage - which can happen in a couple of minutes in dry windy
 conditions, in a rainfall, or even during a snowfall, you'll still damage
 the rig when you connect it because the voltage won't drop fast enough
 through the protection circuit. Not even a choke may protect against that
 due to the rapid rise time of the spike.

 That's why it's an excellent idea to keep any disconnected antennas grounded
 or, if one has been left open, to ground it before connecting it to the rig.


 Hopefully less common is a nearby lightening discharge that induces a
 current in the antenna. I'm not talking about a direct hit or even anything
 close to it. The strike may be some distance away and still induce a
 damaging amount of current that the resistor (or choke) cannot bleed off
 fast enough. That's another reason to shut down and ground antennas if
 lightning can be heard, no matter how far away.

 73, Ron AC7AC


-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Re: [Elecraft] Small got-ya to watch for when doing the K3 12VDC Out Current Mod

What most people notice is that the P3 will switch off after a period of
operation when the resettable fuse finally heats enough to open. Your K3 may
have a defective resettable fuse in the 12V output line. 

73, Ron AC7AC

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of vk4tux
Sent: Sunday, September 09, 2012 7:16 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Small got-ya to watch for when doing the K3 12VDC
Out Current Mod

I have the kit 12v output mod kit still sitting in the shack draw unfitted,
and have been running the P3SVGA module  first in vk since they started
shipping.

 I have had no issues and run the K3 at 15v. 



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[Elecraft] KX3 with a long wire antenna

2012-09-09 Thread TG9AJR Juan Munoz

Hi,

I will on a trip and will picking up my KX3 and will like to do some
test on the air,
not sure what kind of antenna I get but I was thinking on a long wire,
has anyone
experiment with this kind of antenna and the KX3 and any particular length ?

Thanks 73 DX de

Juan
TG9AJR
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Re: [Elecraft] KX3 with a long wire antenna

Juan,

For 40 meters and above, I would suggest the antenna and counterpoise 
recommended in the KXAT1 manual - 24 to 28 foot radiator, 16 foot 
counterpoise.
Sorry, but I do not have the conversion to metric handy.

73,
Don W3FPR

On 9/9/2012 11:11 PM, TG9AJR Juan Munoz wrote:
 Hi,

 I will on a trip and will picking up my KX3 and will like to do some
 test on the air,
 not sure what kind of antenna I get but I was thinking on a long wire,
 has anyone
 experiment with this kind of antenna and the KX3 and any particular length ?

 Thanks 73 DX de

 Juan
 TG9AJR
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[Elecraft] Elecraft CW Net Report for September 9th 10th, 2012

2012-09-09 Thread kevinr

Good Evening,
We had two good nets on a couple of weak bands.  QSB on both but the 
lion's share of QRN on 40 meters.  Someone, somewhere was getting a 
thunderstorm.  Here we are getting rain but it is slow and without wind. 
  Propagation was not great last week and it has held through the 
weekend.  While working on these two computers I was listening to a 
contest.  Folks would fade in, hold the frequency for a bit, and then 
fade out so someone else could take their place.
After a week of cool weather, where I could cut and move firewood, 
this one was warm and then hot.  Pretty dry too which helped a forest 
fire start in the Cascades of Washington.  I awoke on Thursday to a 
strange smell.  It was burning pine.  There are no native pine trees in 
the Coast Range so I knew I did not have to rush out the door.  The next 
two days had the Columbia Gorge fill with smoke which pushed over my 
ridge.  It was pretty hazy until the front moved through and blew some 
of it away.

On to the lists =

   On 14049.5 kHz at 2200z:
K0DTJ - Brian - CA - K3 - 4113
AC5P - Mike - OK - K3 - 2170
W8OV - Dave - TX - K3 - 3139
N0AR - Scott - MN - K2 - 4866
W0CZ - Ken - ND - K2 - 1031
AB9V - Mike - IN - K3 - 398

   On 7045 kHz at 0200z:
W8OV - Dave - TX - K3 - 3139
K0DTJ - Brian - CA - K3 - 4113
W0CZ - Ken - ND - K2 - 1031
N0AR - Scott - MN - K2 - 4866

   It was good to hear you all.  From the scattered weather reports it 
looks like things are cooling off.  Even Dave, in Texas, spoke of cooler 
temperatures.  I think they got a little of the rain from Isaac so 
hopefully they are not as bone dry.  The sun is setting noticeably 
earlier than even last week.  Soon the equinox and then preparations for 
winter.  Summer has zoomed by but it has been an enjoyable one.  While 
cutting firewood and clearing the down trees I am trying to create a few 
paths to some grassy areas.  Seems the local elk and deer population 
have been keeping their eyes (and ears and noses) on me.  Each time I 
walk the new paths I find signs that elk or deer have either been 
browsing or napping.  While cutting through the hung up fir and alder I 
have to cut my way through young alder.  To make things more pleasant 
for me I leave some shade.  Once in a while the grassy area is right 
under where I am cutting the alder to allow me to cut the fir.  Within a 
day I find they have taken advantage of that spot for a nap.  Now that 
early elk season has begun I expect more encounters with the wily elk on 
this mountain.
Until next week stay well,
   73,
  Kevin.  KD5ONS  (Net Control Operator 5th Class)

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Re: [Elecraft] Small got-ya to watch for when doing the K3 12VDC Out Current Mod

2012-09-09 Thread vk4tux


Ok, I was thinking the P3/SVGA drew less current at 15v than 12v, due to the
5/3.3/2.5/2.2 v pwr supply setup requiring less current at 15v input than it
does at 14v input or less.

I checked the K3 output with a 20 ohm/50w variable rheostat and it trips at
0.6amp or 600mA on my fluke 87.







What most people notice is that the P3 will switch off after a period of
operation when the resettable fuse finally heats enough to open. Your K3 may
have a defective resettable fuse in the 12V output line.



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Re: [Elecraft] JT65 on the KX3: improved VFO temperature stability

2012-09-09 Thread Tony Estep

On Tue, Sep 4, 2012 at 11:44 AM, Wayne Burdick n...@elecraft.com wrote:

 I have a new revision of KX3 field-test firmware available

==
Any more news on this? I'm rarin' to go.
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Re: [Elecraft] Antenna static charge precautions - any tips?