Re: [Elecraft] Mast question

[George Dubovsky]

I would look for 3 used sections of Rohn 25, then figure out how to safely
bracket it to your house, if possible. That should be do-able for somewhere
close to your budget and certainly capable of holding up a G5RV.

73,

geo - n4ua

On Fri, May 27, 2016 at 9:19 AM, Reuben Popp  wrote:

> Hey everyone, more of a beginner question here and not [directly] Elecraft
> related.
>
> I have a K2 I built some time ago that I paired with a half size g5rv.  At
> the time, I was living with a buddy whose house design allowed me to set
> that antenna up as a sloper (and it worked quite well).  That said, some
> years have passed, I'm married now and the house I live in now is much
> smaller.  I have the antenna still, but it's merely laid along the vertex
> of the roof.  Reception is so-so, but I know it could be much better.  So,
> what can I use for a reliable mast that would be left up all the time?
>
> There's no trees in the lot. The house itself is a single level house on a
> slab (no basement). and from end to end it's _maybe_ all of 40'.  The
> distance from the ground to the vertex is maybe all of 16 feet (or there
> abouts).
>
> The XYL said she doesn't want guy wires all over and a rohn style tower is
> out of my budget.  I'm looking for suggestions that's preferably < $300, if
> possible.  The locale is mid-east Missouri, about an hour outside St.
> Louis; storms come and go but it's not like I'm in tornado country (if that
> helps any).
>
> So, what do folks recommend?
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Re: [Elecraft] P3 Panadaptor

[George Dubovsky]

Well, it makes unassisted S/P a lot faster; just tune for the next blip.
And, if you have directional antennas, like a NE beverage on 160 or 80, it
helps to pre-qualify some signals as to multiplier possibility.  And it
certainly helps to see how close the interference is when you're running. I
wouldn't contest without it now. But I don't do fone so maybe that colors
my judgement.

73,

geo - n4ua

On Sat, Apr 2, 2016 at 4:29 PM,  wrote:

> I added the P3 panadaptor to my K3S line this year  I have used it twice -
> in the CW WPX RTTY contest and in last weekend's WPX Phone contest. I have
> not found any use for it (in contesting) other than to tell me that the
> band
> segment is fill of signals, which I already knew. I did not notice any
> obviously quiet frequencies that would be good to CQ on, nor can I tell
> when
> a big pileup occurs on a new potential multiplier.  What is the secret to
> using a P3 during major contests?
>
> John KK9A
>
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Re: [Elecraft] Whole house surge protector at the main breaker?

[George Dubovsky]

For the last 20 years, I have had a Joslyn 1265-85 at the panel. I'm sure
it's no longer available, but it's a 10x12x6 NEMA 4 box with fist-sized MOV
modules inside with some monitoring circuitry on a small pwb driving 2
front panel LEDs. I am at the very end of a long rural 12.4 kV run in
central VA and, so far so good. (he said, snapping his fingers to keep the
elephants away...).

73,

geo - n4ua

On Wed, Jan 6, 2016 at 5:16 PM, Lynn W. Taylor, WB6UUT <
k...@coldrockshotbrooms.com> wrote:

> Me too.  Please post replies to the list.
>
> On 1/6/2016 2:12 PM, kg9hfr...@gmail.com wrote:
>
>> OK, I am curious, what are you guys using for the whole house surge
>> protector at the main breaker?
>> Frank KG9H
>>
>
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Re: [Elecraft] High SWR below 40 meters

[George Dubovsky]

Now that you have a KAT-3, you have 2 antenna ports. Is there any chance
that the wrong one is selected for those bands?

73,

geo - n4ua

On Mon, Dec 14, 2015 at 4:27 PM, Jan Ditzian  wrote:

> My K3 has been having RF feedback problems with an 80 meter antenna.  In
> order to resolve things, I built an 80-meter dipole to use as a test
> antenna.  While all this was happening, over the past few months, I also
> added a used KAT-3 tuner and a KXYN3A to replace the original synthesizer.
>
> After building the dipole, I was puzzled that it would not tune up on 80.
> I do not know why it took me a week, but I finally checked out the rig on
> my dummy load.  It shows a high SWR on the dummy for all wavelengths
> greater than the 40-meter band--60, 80, and 160. The rig works just fine on
> 14 mHz. and up, and I can certainly tune it up on 40 meters.  Further
> checking shows that there is no output on 60-160, whether using the Tune
> mode at 5 watts or CW mode at 70 watts.
>
> I have no idea when or why this happened, but I really need to know the
> how it happened, so I can fix it.  Can someone give me some guidance on
> what to look at to figure this out?  It is possible that resolving this
> problem will also result in a resolution of the RF feedback problem,
> although I won't count on that.
>
> 73,
>
> Jan, KX2A
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Re: [Elecraft] Station setup

[George Dubovsky]

When I was faced with the need for more room - and access - I went
"mobile". Here is the description of my current operating desk in the
October 2013 issue of the PVRC newsletter:

http://pvrc.org/Newsletters/oct13.pdf

I'm a metalworker more than a woodworker... ;-)

73,

geo - n4ua

On Wed, Sep 16, 2015 at 11:51 AM, DGB  wrote:

> If you have the room, leave at least 2' behind the desk ... remember all
> the wires you'll have behind that equipment!
>
> See K9CT'S website for good reference.
>
> Have fun ... 73 Dwight NS9I
>
>
>
> This desk will go in a room corner tight against the walls with a window
> to the left of this location. A dark desk top, black walnut, will need good
> illumination.
>
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Re: [Elecraft] K3S - Ordered Today!!

[George Dubovsky]

Well, I knew I was a big gun when I got my first K3 - a pair of 45's... ;-)

73,

geo - n4ua (s/n 4545)

On Sun, Sep 6, 2015 at 9:20 AM, Phil Anderson 
wrote:

> Are you looking for 007 or what? Perhaps 7373?
>
> What would a cool number be?
>
> Jerry Moore 
>> Saturday, September 05, 2015 8:03 PM
>> YAY!
>> I ordered my K3S today. I'm really hoping I get a cool serial number
>>
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>
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Re: [Elecraft] P3TXMON question?

[George Dubovsky]

On Sun, Aug 23, 2015 at 4:36 PM, Ken G Kopp kengk...@gmail.com wrote:

 Bob,

 The scale calibration --is-- compressed to the right of center,
 --not-- to the left as you state, making the left portion expanded
 and easier to read.

 73!

 Ken - K0PP


​Easier to read, perhaps, but less accurate. To read 100 W with the highest
accuracy, you have to use a 100W slug. (period).

73,

geo - n4ua​



 On Sun, Aug 23, 2015 at 2:14 PM, Bob McGraw - K4TAX rmcg...@blomand.net
 wrote:

 
  This seems to have things really screwed up.   Yes, the Bird 43 is a 5%
 of
  F.S. accuracy instrument.   The Bird 43P is somewhat less accurate,
  although 5% F S with carrier, and more like 8% F S or so in peak mode.
  In measuring a 100 watt radio with a 100 watt F S slug would seem to be
  most accurate.Total accuracy decreases as the indicated value
  approaches the left side of the scale.   Now using a 250 watt slug to
  measure a 100 watt radio,  the earlier states that most accuracy is to
 the
  left of center, which by the way, is the compressed side of the scale.
  This makes no sense as the scale markings are much more difficult to
  approximate.   In fact the most accurate area is to the right of center
  toward full scale is the expanded scale  which is where the highest
  accuracy actually occurs.   With a 100 watt radio and a 100 watt F S
 slug
  the error is +/- 5 watts at 100 watts.  Using a 250 watt element and
  measuring 100 watts near center scale the error is more like +/- 12.5
 watts
  or 5% of the  F S value.
 
  If one measures the same power source with identical elements and gets
  different results, they should refrain from buying ham fest elements for
  indeed the elements are not identical.  To wit, I purchased 3 new 100
 watt
  elements and 3 new 2500 watt elements. They all give identical results
 +/-
  the width of the pointer.  I don't buy ham fest Bird elements as I find
  they are junk and not worth the brass they contain.
 
  And remember, Bird 43 instruments are calibrated for only a 50 resistive
  load.  Any other load being used leaves one with a best guess situation
  as to actual power.
 
  73
  Bob, K4TAX
  K3S s/n 10,163
 
  On 8/21/2015 11:48 PM, Wes (N7WS) wrote:
 
 So by your logic it would be best to measure one Watt using a 100W
  element.
 
  On 8/21/2015 8:03 PM, Ken G Kopp wrote:
 
  Bird accuracy is specified to be +/- 5% of meter full scale ... a 100W
  element would be a poor choice to measure a 100W output level. Take a
  look
  at any Bird's meter scale.  It's not linear and can be read with the
 most
  accuracy to the left of center scale.  A 250W element is much better
 for
  measuring 100W.
 
  Wanna chase your tail?  Measure the same power source with identical
 Bird
  elements..
 
  Don's method is better, but all methods are obviously subject to the
  accuracy of the final indicating instrument.
 
  FWIW .
 
  73l
 
 
 
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Re: [Elecraft] Australia trip

[George Dubovsky]

And, of course, a quick read of Bill Bryson's In a Sunburned Country is
recommended - but that's true even if your not going to Australia...

73,

geo - n4ua

On Fri, Jul 31, 2015 at 6:57 PM, Walter Underwood wun...@wunderwood.org
wrote:

 One tip — in Australia, “Ayer’s Rock” is pronounced “Uluru”. I gave up
 trying to match the local pronunciation of “Cairns”.

 wunder
 K6WRU
 CM87wj
 http://observer.wunderwood.org/ (my blog)

 On Jul 31, 2015, at 8:44 AM, Thaire Bryant w2...@myfairpoint.net wrote:

  I will be traveling in and near Australia for the month of August and
 plan
  to operate /p and /mm with a KX3.
 
  My dates and locations are below.  I would appreciate hearing of any
 Radio
  related events (club meetings,
 
  boot sales, flea markets, etc) that I might be able to attend.  Thanks in
  advance for any info provided.
 
 
 
  August 4-9  Sydney
 
  August 9-11 Cairns
 
  August 11-14 Ayers Rock
 
  August 14 Alice Springs
 
  August 15 Perth
 
  August 16-30 /mm as C6APF region 3 NW of Australia and near 4W and YB.
 
 
 
  73 es TU
 
 
 
  Thaire  W2APF
 
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Re: [Elecraft] Sherwood Engineering Tests

[George Dubovsky]

On Tue, Feb 24, 2015 at 12:27 PM, Wayne Burdick n...@elecraft.com wrote:

 Jim (et al),

 The K3's audio has improved due to three factors in the past couple of
 years:

 - a low-noise, low-pass audio filter stage was added to the DSP board,
 eliminating high-pitched CODEC artifacts


​Approximately what serial number introduced this change? Thanks.

73,

geo - n4ua​



 - DSP firmware changes were made to correct AGC linearity and eliminate a
 CODEC quantization problem

 - main MCU firmware was modified to allow the user to select the lower AF
 cutoff in CW mode (100/200/300 Hz) by adjusting the lower edge of the
 crystal filters

 With the above changes in place, we carefully measured the K3's audio
 spectra and compared it to other radios with the same type of class-AB
 final AF amplifier IC (most transceivers fall into this category). They are
 all virtually identical.

 Rob, too, told us that the audio spectra he measured on a recent K3 (with
 new synths and the latest DSP and MCU firmware) was significantly improved
 from the K3 he measured several years ago.

 While it is possible to reduce audio IMD products even further, this
 typically requires a class-A final audio output stage, which would add
 perhaps 0.5 to 1.0 amps of additional receive-mode current drain (and an
 associated heatsink). That is inconsistent with the K3's intended usage,
 which includes excellent power efficiency for portable applications (Field
 Day/DXpedition/travel). Also, most users would not notice such a subtle
 change.

 73,
 Wayne
 N6KR


 On Feb 24, 2015, at 8:19 AM, jim jbol...@outlook.com wrote:

  Wes,
 
  I agree, and if you look at a post I made a couple days ago, it states
 that.
  Sherwood also states his list is sorted on one column and people shud
 take
  all factors into account when choosing a radio.
 
  I would NOT recommend a K3 for it's audio.
 
  Each person has their needs and should review them carefully.  I would
 also
  not recommend a Drake R4-C, even though it is in the top quartile.
 
  I will send you a copy of an earlier post that I made.
 
 
  Jim
  W6AIM
 
 
 
  -Original Message-
  From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
 Wes
  (N7WS)
  Sent: Tuesday, February 24, 2015 6:12 AM
  To: elecraft@mailman.qth.net
  Subject: Re: [Elecraft] Sherwood Engineering Tests
 
  I'm sure there's a point here and I just fail to see what it is.
 
  Rob has stated many times (look for his videos) that one number does not
 a
  radio make.  In fact, as best that I know, he doesn't own a K3.
 
  Wes  N7WS
 
  On 2/23/2015 11:01 PM, jim wrote:
  Guys,
 
  Further, pesky, facts on said Real Radio at
  http://www.sherweng.com/table.html .
 
  Number two on the list.  That is out of 116 receivers listed on the
  Sherwood page.
 
  That puts said Real Radio in the top 3% of the radios Bob Sherwood has
  tested for a critical receiver performance parameter.
 
  BTW, you will have to use the Page Down button, more than twice, to
  even get a hint of the Kenwood 590.  It is number 20 on the list,
  putting it in the top 17%
 
  Also, important to note, is the Drake R4-C with the Sherwood roofing
  mod, listed at number 28.  The R4-C is *ONLY*
  45 (forty five) year old technology and that puts it in the top 23%.
  Yep, FORTY FIVE year old technology.  Yep, top 23 %.
 
  Just some further, pesky, facts.
 
  Rake
 
  P.S.  BTW, I learned 45 years ago.  This flies in the face of
  someone's comment that I never learn.
 
  Ho Hum, another pesky fact.
 
 
 
 
 
 
 
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[Elecraft] K3EXREF upgrade

[George Dubovsky]

With all of this talk of synthesizer upgrades, if you are considering
adding a K3EXREF while your K3 is open, this is a shameless plug for a very
nice Trimble Thunderbolt 10 MHz precision source plug-and-play appliance
that I have posted on QTH. Thank you.

73,

geo - n4ua
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[Elecraft] Fwd: K3EXREF upgrade

[George Dubovsky]

The Trimble has found a new home; thanks to all.

73,

geo - n4ua

-- Forwarded message --
From: George Dubovsky n4ua...@gmail.com
Date: Sat, Feb 14, 2015 at 6:30 AM
Subject: K3EXREF upgrade
To: Elecraft Reflector elecraft@mailman.qth.net


With all of this talk of synthesizer upgrades, if you are considering
adding a K3EXREF while your K3 is open, this is a shameless plug for a very
nice Trimble Thunderbolt 10 MHz precision source plug-and-play appliance
that I have posted on QTH. Thank you.

73,

geo - n4ua
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Re: [Elecraft] A K3 Pileup Wrinkle with CW Skimmer

[George Dubovsky]

On Fri, Feb 6, 2015 at 4:38 PM, Larry Libsch llib...@bellsouth.net wrote:

 For those who are so disabled as to require an external crutch to
 copy their own call and 5NN, it is a simple matter to reverse channels
 in the sound card (at most it requires a reversing cable) to decode
 audio on the sub Receiver.


 Ah, the old CW snobbery! When is the notion that paddle or key
 generated CW is superior to software and keyer generated code going to
 disappear?


I don't think the original comment had anything to do with generating cw.


 You decode RTTY with software, don't you?


Yes. It was designed to be machine-decoded.


 CW is just another digital mode.


Yes, one that was designed to be able to be decoded by ear.


 Software decoding has brought many new CW ops into CW DXing and contesting.


Great!


 Software encoding is more accurate


At high signal/noise levels it is perhaps as accurate.


 and allows many ops to achieve speeds they could never otherwise achieve.


Only if they choose to not practice and improve.


 Perhaps you use a keyer for contesting? Many (most?) contesters do.


You betcha.


 CW contest participation is declining.


Oooh, I'd love to see your research on this one.


 RTTY contest participation is increasing.


Great!


 Software is every where improving our lives.


True.


 Time to give up on old ways and ideas and move into the future.


As long as the future is an improvement - 'tisn't always so.

73,

geo - n4ua



 K4KGG, Larry
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Re: [Elecraft] 240V Line

[George Dubovsky]

On Wed, Dec 24, 2014 at 2:13 PM, Phil Kane k2...@kanafi.org wrote:

 On 12/24/2014 10:39 AM, Jim Brown wrote:

  Installing a 240V outlet is not a big deal unless the construction of
  your home makes it difficult to run the cable. Barring that, a competent
  electrician should be able to do that in a half day; a difficult run
  could double the work. All that is required is a pair plus a Green wire.
  If you also want 120V outlets from the same circuit, you'll need another
  conductor for the neutral.

 IIRC the latest code update now requires the separate neutral (white
 wire) to be run in all 240V circuits.  I did that in a 1969 when I
 finished the basement in a year-old home!


Even if that is true,and I suspect all is a mis-statement, that doesn't
automatically mean that YOUR Authority Having Jurisdiction has adopted the
latest code (or the previous one or the one before that). Things move
slowly in some places.

73,

geo - n4ua


 73 de K2ASP - Phil Kane
 Elecraft K2/100   s/n 5402

 From a Clearing in the Silicon Forest
 Beaverton (Washington County) Oregon
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Re: [Elecraft] SO-239 Bulk head fitting..

[George Dubovsky]

Dave,

It's 5/8-24, and not likely available at the hdwe store. For one thing, it
usually has to be very thin to work in bulkhead installations. The same
thread is used for N connectors, so ask around the local hams and see who
has a good junk box.

73,

geo - n4ua

On Tue, Oct 21, 2014 at 7:00 PM, Dave G. d3j...@gmail.com wrote:

 Does anyone know the size of the nut that secures a bulkhead SO-239
 socket to a chassis?
 Available at my local hardware store?

 Dave G.KK7SS
 Richland, WA.
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[Elecraft] [K3] 10 MHz GPS Disciplined Oscillator

[George Dubovsky]

For users of the K3EXREF high-stability option, I have listed a Trimble
Thunderbolt GPSDO package on QTH today.

73,

geo - n4ua
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[Elecraft] [P3] fatal error

[George Dubovsky]

OK, I just spent 2 hours as W1AW/4 on 40 cw and everything was working
fine. I changed bands and the P3 displayed:

FATAL ERROR
In: ddc_set_coef()
span=0

Press any active key to escape

But all keys are dead, so no escape from the black screen of death. Power
down/up does no change the message. Does anyone know what I'm up against
here? Oh, this P3 has the SVGA board installed which I am not using.

73,

geo - n4ua
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Re: [Elecraft] [P3] fatal error

[George Dubovsky]

Parameter Initialization fixed it! Thank you, Alan.

73,

geo - n4ua


On Thu, Apr 10, 2014 at 11:50 AM, Alan Bloom n...@sonic.net wrote:

 Try doing the Parameter Initialization (see Troubleshooting section of P3
 Owner's Manual.)  Basically you hold the LABELS key while turning on the
 power with the POWER key.

 Alan N1AL



 On 04/10/2014 07:27 AM, George Dubovsky wrote:

 OK, I just spent 2 hours as W1AW/4 on 40 cw and everything was working
 fine. I changed bands and the P3 displayed:

 FATAL ERROR
 In: ddc_set_coef()
 span=0

 Press any active key to escape

 But all keys are dead, so no escape from the black screen of death. Power
 down/up does no change the message. Does anyone know what I'm up against
 here? Oh, this P3 has the SVGA board installed which I am not using.

 73,

 geo - n4ua
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Re: [Elecraft] The case for a Panadapter - opinions, please?

[George Dubovsky]

Hi Jim,

You'll be buried by responses to your question, but let me say that I am as
old-school cw-centric as they come. I contest unassisted, and I used to
question the value of the visual aspect of panadapters too. Until I got a
P3. I can't operate without it! On sp, it helps to separate the weaker
sigs from the loud cq machines - that you've already worked - and to
recognize that there is a guy that just quit transmitting on a freq, so you
wait a few seconds for him to reappear to see if it's a needed one.

When I got a second K3, I HAD to have a second P3.

Yeah, it's still fishing, but the barrel is big and deep, and sometimes you
need a fish-finder.


73,

geo - n4ua


On Fri, Feb 28, 2014 at 1:08 PM, Jim Lowman jmlow...@sbcglobal.net wrote:

 I'm basically a SP operator, especially in contests.  I've found that
 calling CQ is something of a waste of valuable time.

 When I see options like the Panadapter, or bandscopes from other
 manufacturers, I get the metaphor of fishing in a stocked pond.

 So, for those of you who have this option, could you describe how it has
 assisted you?
 In another message, someone mentioned that weak stations outside of the
 passband could be missed, which is a good point.

 BTW, I'm not opposed to giving the good folks at Elecraft more of my $$$
 if this is a good idea.

 Thanks in advance and 73 de Jim - AD6CW
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Re: [Elecraft] ... and solar power

[George Dubovsky]

I posed the question to one of the Engineers at Morningstar. His response,
in part:





*That said, for low power MPPT really isn't a huge requirement.  The peak
power of those panels listed is only 15.4V.  When they are hot it will drop
further too.  SO charging a battery to 14.xV there is almost nothing to be
gained by mppt (and its more expensive AND lower running efficiency.)
Money is better spent on buying X more watts of panel w/ a cheaper
control.  You'll get more power out of it. The ProStar and SunSaver
controls even have a on/off mode jumper that changes the switching from
~300Hz to =1Hz.  EMI isn't the problem there its the PSRR.  At 300Hz
current pulses from the panel, the battery voltage will jump up/down due to
its internal resistance (which goes up as it gets full.)  As you know, no
one in the mobile RF world uses regulators on the P12 supply instead just
running the amp transistors right off it.  So you can get a 300Hz 'buzz'
modulated into your audio pretty easily.  The 1Hz doesn't charge quite as
well but simply 'clicks' vs buzzes which people find much less
objectionable in their audio.  MPPTs switch so fast they have filtered DC
coming out so you don't hear that.  But they have conducted and radiated
EMI.  *
FWIW...

73,

geo - n4ua


On Mon, Dec 2, 2013 at 3:33 PM, Igor Sokolov ua9...@gmail.com wrote:

 Dave,
 Can you point to a good regulator and/or chjarger suitable for HF radio
 use?

 73, Igor UA9CDC


 Yes, very good.

 Alternative URL:-
 http://preview.tinyurl.com/mznv6e2
 Goes to the same place as quoted above..

 You can often find them on eBay too (for a price!)   I have a 45W
 version. Take
 care though, in bright sunlight, they can produce well over 28V to an
 open cct or
 low power load.  A good regulator is needed.  Otherwise, very good, and
 very
 portable.

 Sadly, many of the good regulators (with MPPT functionality) are not
 exactly
 RF quiet for HF radio users.

 73.

 Dave G0WBX.

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Re: [Elecraft] ... and solar power

[George Dubovsky]

The guy I talked to is a better Engineer than you or I will ever be, and
he's also a ham. Obviously you didn't bother to read the salient point of
my posting, to wit:

*The ProStar and SunSaver controls even have a on/off mode jumper that
changes the switching from ~300Hz to =1Hz. *
Have a nice day...

73,

geo - n4ua


On Mon, Dec 2, 2013 at 5:22 PM, Jim Brown j...@audiosystemsgroup.com wrote:

 On 12/2/2013 2:16 PM, George Dubovsky wrote:

 I posed the question to one of the Engineers at Morningstar.


 Good comments. BUT -- to most engineers making this stuff, radio is
 VHF/UHF, and devices that are RF clean at VHF/UHF can be screamers at HF.

 73, Jim K9YC



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Re: [Elecraft] External Speakers for K3

[George Dubovsky]

I don't use speakers a lot, but the best sounding ones I have ever used
were the ones designed for land mobile radio in-car use. The GE Mastr II
and the GE/Ericsson Delta speakers were designed to be rugged and were
tailored for communications audio. I'm sure Motorola had equivalents, but
I'm not all that familiar with their product line. The speakers are
generally found under tables at hamfests for a few bucks. The black/gray
Delta speakers even match the Elecraft line... ;-)

73,

geo - n4ua


On Mon, Apr 22, 2013 at 4:34 PM, Fred Smith m...@mo-net.com wrote:

 There are plenty of speakers to choose from on the market and do not cost
 that much either. As far as power supplies I would rather use my own a
 large
 one to power many different things in the shack I use 2 Astron 70 amp
 supplies a VS and a RS-70M.

 73,
 Fred/N0AZZ

 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV
 Sent: Monday, April 22, 2013 2:36 PM
 To: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] External Speakers for K3



 On 4/22/2013 3:21 PM, Ian Reeve wrote:
  As Bill says, intelligibility is best from forward facing speakers and
  a good quality 6 diameter speaker would sound great.  Just make sure
  that a stereo jack is used for the rear jack socket...

 Given the size of the P3 case I suspect one would be limited to a 3
 or 3.5 (round) speaker or a 3 x 5 oval one.  The interior of the
 P3 front panel is slightly less than 4 x 6 and will not accommodate
 either
 a 6 (round) speaker or 4 x 6 (oval).

 73,

 ... Joe, W4TV
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Re: [Elecraft] FS: [K3] 400 Hz 8-pole filter

[George Dubovsky]

The filter has been sold. Thanks...

73,

geo - n4ua

On Wed, Feb 6, 2013 at 11:45 AM, George Dubovsky n4ua...@gmail.com wrote:

 For Sale - KFL3A-400, removed from a s/n 6xxx used K3 I recently bought.
 $106 shipped US.

 73,

 geo - n4ua

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Re: [Elecraft] RS232 vs USB yet again...

[George Dubovsky]

One of the still-plentiful, proven, and inexpensive Edgeport boxes (USB to
4 or 8 RS-232) would seem to obselence-proof your station.

73,

geo - n4ua

On Sat, May 12, 2012 at 8:48 AM, John Ragle tpcj1...@crocker.com wrote:

 It is very rare that one can find a modern PC desktop that comes with 1
 or more RS-232 serial ports, just as it is becoming more and more
 difficult to find stock desktops with expansion slots on the MoBo.
 Laptops, at least newer than my ancient IBM Thinkpad, are even less
 likely to be equipped with RS-232 ports. This puts hams in an invidious
 position -- either use some old clunker of a desktop that came with
 RS-232 equipment, or find an expansion board that will plug into the
 MoBo of a moderately old tower, or use a USB--RS-232 converter and go
 modern.

 Regarding the various items of Elecraft equipment, the choice between
 USB and RS-232 seems to have had very little to do with relative merits.
 It is not which one is better? but which one is more suitable?
 Apparently a substantial fraction of the brethren use superannuated
 desktops because this is a reasonable financial option. Another fraction
 of us use modern-day laptops, even though they promise half the
 performance at twice the price of a modern desktop. When the choice is
 between USB--RS-232 conversion and RS-232--USB conversion, the former
 is more readily available (the USB-RS-232 converters) than the latter.
 Again, this is just a marketing matter.

 Unfortunately, not all USB--RS-232 converters are usable; some are
 more equal than others (apologies to George Orwell). A lot of the
 previous fuming and fussing over this topic has concerned specific chip
 sets and manufacturers of these converters. This is where the archived
 to-and-fro is of most utility. At first I was also a bit put off to
 discover that Elecraft relied on what I thought of as antiquated
 hardware, but in retrospect, I have gone over to the dark side and
 embraced the DB-9. I have used Firewire, USB, and RS-232, and find I
 much prefer the latter. I am fortunate to have a desktop with expansion
 slots, though in a bit of a quandary planning for the succession.

 John Ragle -- W1ZI

 --

 Sent from my lovely old Dell XPS 420

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Re: [Elecraft] SMT and the K3 - Nerves

[George Dubovsky]

Both at work and at home, I use two irons to remove SMD parts. The earlier
poster that warned against pad damage when clipping a chip in half was
right on; the damage won't occur most of the time, but it will certainly
happen on the hardest to remove or the hardest to replace board ;-) And, I
maintain that there's a special place in hell reserved for people who
design in 0402 and smaller parts when they have plenty of real estate on
the board!!

73,

geo - n4ua

On Thu, Apr 19, 2012 at 5:58 PM, Alan Bloom n...@sonic.net wrote:

 On Thu, 2012-04-19 at 14:23 -0700, Ron D'Eau Claire wrote:

  I have removed hundreds of two-terminal SMDs both by cutting them in
 half or
  by unsoldering one end at a time and lifting the part with never any
 damage
  to the pcb.

 On most two-terminal SMD parts (resistors, capacitors, etc.), the solder
 terminal on each end extends on both sides (top and bottom).  So the way
 I generally remove them is to tin the top of each contact with a little
 solder and then lay the soldering iron tip across the top of the entire
 part so that it heats both ends at the same time.  Once the solder
 melts, you can push the part off the pads with a toothpick, Exacto
 knife, whatever.

  Good light and your favorite magnifiers (if needed) to see clearly are
  essential.

 In my experience, being able to see the darn thing clearly is really the
 key to successful SMT work.  I have a binocular microscope with built in
 light that I bought brand new for about $300.  Whatever you use, make
 sure to have a bright light, and some form of magnification is very
 useful for those of us with middle-aged (or greater) eyes.

 Alan N1AL


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Re: [Elecraft] Overtighted Case Screw Removal?

[George Dubovsky]

No, there are actually left-hand drill bits for certain specialty
operations. This would be one of them ;-)

I can testify that left-hand drills and left-hand taps should be securely
locked up in the shop lest they vex the unwary - hehe.

73,

geo - n4ua

On Sun, Nov 13, 2011 at 5:44 PM, kevinr kev...@coho.net wrote:

 Backward drill bit?  Would that be an Easy Out?

 Kevin.  KD5ONS


 On 11/13/2011 2:06 PM, DOUGLAS ZWIEBEL wrote:
  I recently upgraded my first run K3 and SN 822.  822 was fine, but
  with #295, I had the same thing as you describe..several times.  I
  sure did not tighten them that much when I put it together!
 
  Besides what Bill has contributed to your issue, I had to leave the 2D
  in place and manage to remove all the other screws so that the block
  came off with the side panel.  I then used a traditional pliers to
  undo the block.  So like I said, no way I made it that tight
  originally.  Maybe it's an Elecraft feature...self-tightening screws?
  LOL
 
  So you may need to be a bit more creative than simply rocking the side
  panel 30 degrees to loosen it up (or other panels).  Worst case, you
  can get one of the backwards drill bits (no, I don't know what they
  are really called) and take it out that way.  I did not need to do
  that.
 
  de Doug KR2Q
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Re: [Elecraft] FS GPS DO

[George Dubovsky]

The unit in question is a Trimble Thunderbolt GPS -disciplined 10 MHz
oscillator. They are removed from last-generation E911 location equipment
manufactured by Andrew Corp in Lynchburg, VA (my employer). A ton of them
were surplussed out and wound up in the far East at a scrap dealer. They are
fine units; they require +5, +12 and -7 to -12 Vdc to operate. The 1pps is 1
pulse-per-second. The other reference output is 10 MHz sine wave at from +10
to +13 dBm output. After disciplining, the outputs are within 10E-10 to
10E-12 of the GPS constellation master clock which is Cesium-based. In other
words, they are infinitely better than anything required on HF for a
reference, but if you are working at VHF up to microwaves, the frequency
accuracy gets to be something worth considering. The one in the picture kind
of looks like it was painted. The units were originally gold-alodined
aluminum cases, and they came with a 3 dB splitter mounted to the top cover
for splitting the 10 MHz output 2 ways.

If you have any questions about the units, I'll try to answer them.

73,

geo - n4ua

On Wed, Aug 3, 2011 at 6:05 PM, Fred Townsend ftowns...@sbcglobal.netwrote:

 Brian: For us guys out there that may not be familiar with a GPS DO how
 about a little information. I visited the e-bay site and found the titled
 PRECISION GPS 10Mhz 1PPS picture. Now I can handle 10 MHz but what is 1PPS?
 One pulse per second? One part per picosecond? Is that long term or short
 term? Is that a 24 volt power supply? Does the power supply come with it? I
 also see it's refurbished. What part was refurbished and why?

 I would enquire offline but I bet there are a lot of others that would like
 to know too.

 Thanks,
 de Fred, AE6QL

 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian Alsop
 Sent: Wednesday, August 03, 2011 10:11 AM
 To: elecraft@mailman.qth.net
 Subject: [Elecraft] FS GPS DO

 Guys,

 Used this to calibrate my Rubidium standard.  Have no further use for it.

 Working unit is complete with power supply, GPS, active antenna
 interconnect
 cables and Windows software.

 See:
 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=290322053618
 for pix of it.

 Contact off reflector.  Reasonable offers accepted.

 73 de Brian/K3KO


 -
 No virus found in this message.
 Checked by AVG - www.avg.com
 Version: 10.0.1390 / Virus Database: 1518/3805 - Release Date: 08/02/11

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Re: [Elecraft] Rb GPS DO comparison

[George Dubovsky]

Hi Brian,

If you want to go straight to the top of the frequency measuring heap, I
have a GPS-disciplined Rubidium for sale ;-)  It's a NIB Symmetricom StarLoc
II Plus, that gives you GPS accuracy when it's locked to the sats, and
Rubidium accuracy when it's in holdover.

I've been a ham long enough to remember when I was happy to know that I was
inside the band!

73,

geo - n4ua

On Wed, Jul 20, 2011 at 2:52 PM, Ken Alexander k.alexan...@rogers.comwrote:

 Hi Brian,

 Interesting post.  I've read of others using GPS this way, but what does
 this kind of accuracy buy you when maybe 1 in 100,000 other hams go to this
 kind of trouble?

 73,

 Ken Alexander
 VE3HLS


 --- On Wed, 7/20/11, Brian Alsop als...@nc.rr.com wrote:

  From: Brian Alsop als...@nc.rr.com
  Subject: [Elecraft] Rb  GPS DO comparison
  To: elecraft@mailman.qth.net
  Date: Wednesday, July 20, 2011, 2:41 PM
  Guys,
 
  This may be of some use to those interested in locking the
  K3 to an
  external source.  The issue of what kind of source to
  used has been the
  subject of a number of postings.
 
  Clifton labs did the above comparison. Jack's Rb standard
  came in at
  about .0004 Hz relative to a GPS DO at 10MHz.
 
  I was wondering how accurate the EBAY purchased LPRO-101
  Rubidium
  oscillator was.  (I wanted to use it as a master
  oscillator for my test
  equipment and perhaps later the K3.)
 
  Comparisons to WWV indicated that in all liklihood it was
  well within 1
  Hz.  There was no way to determine if it drifted
  within that range.
 
  Curiosity finally got the best of me.  I purchased an
  EBAY Trimble
  Thunderbolt GSP Disciplined oscillator.  Supposedly,
  it is more accurate
  than the Rb secondary standard. Assuming it's truth, the Rb
  secondary
  standard was evaluated via the phase drift method using a
  dual channel
  scope.
 
  Out of the box, the Rb standard came in at 0.0075 Hz (10
  MHz) of the
  GPS-D0. With a little tweaking of the ten turn pot in the
  LPRO-101, the
  two are well within 0.001 Hz (nominally 0.0008Hz) at
  10MHz.  There is a
  small drift component of 0.0002Hz after 3 hours after lock.
  Tweaking
  isn't straight forward.  The appears to be a few
  minute latency period
  after a tweak.  One can't simply stop the phase angle
  from moving by
  turning the pot.  Doing so results in an over
  correction a few minutes
  later.
 
  It's difficult to tweak the Rb standard beyond this degree
  of accuracy.
It takes more than 20 minutes to determine a data
  point.  To do better
  would take some automation and a phase detector running for
  several days
  to get sufficient statistics.  Next project is
  building a phase
  detector.
 
  I'm pleased.  The Rb standard has lots of
  advantages:  Price, minutes to
  locking on, portability and simplicity.
 
  The next question: How accurate is the
  GPS-DO?   Anybody got a hydrogen
  maser handy?
 
  Now what to do with the GPS-DO?
 
  Remember when decent receiver dials had only 5 KHz
  markings?
 
  73 de Brian/K3KO
 
 
 
 
 
 
  -
  No virus found in this message.
  Checked by AVG - www.avg.com
  Version: 10.0.1390 / Virus Database: 1518/3776 - Release
  Date: 07/20/11
 
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Re: [Elecraft] 10 Mhz Reference Oscillator

[George Dubovsky]

Wishful thinking? Yeah, probably, for the same reason Elecraft doesn't want
to get into the power supply business. There is a HUGE amount of
closely-held magic in both the precision oscillator and in the GPS
disciplined-oscillator business. Elecraft would have to devote Engineering
resources to develop a product that others already have on the market with
volume production, but aimed at a niche market with a predisposition to
low-end pricing. The percentage of hams that actually NEED a precision
reference oscillator in their radio (for other than bragging rights) is a
small number, indeed.

You can buy 3 or 4 used Thunderbolts today for the cost of a new one - and
likely 3 out of the 4 will work perfectly for this application. Throw away
the bad one, keep a good one, and advertise the other two on the Elecraft
reflector ;-)

73,

geo - n4ua

On Thu, Apr 14, 2011 at 11:30 AM, Roy Morris w4...@carolina.rr.com wrote:

 Presently it seems that the Trimble Thunderbolt is the only reasonably
 priced reference oscillator available.  When ordering one of these you are
 taking a chance as they are refurbished and shipped from China.  Some of
 these units are better than others depending on serial number.  Again, you
 are taking a chance with what is shipped to you.
 Since the K3EXREF is being offered, a logical next step would be to produce
 an external reference oscillator.   I hope Elecraft is developing one.  Is
 this wishful thinking?  Roy Morris  W4WFB
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Re: [Elecraft] OT trying to identify mystery coax cable

[George Dubovsky]

Nope, the original poster is correct. RG214 is the replacement for RG9 -
both double-braid, same connectors...

73,

geo - n4ua

On Wed, Apr 13, 2011 at 2:50 PM, donhall161 donhall...@sbcglobal.netwrote:

 RG214 is NOT modern RG9, but rather is ruggedized RG8. Check your friend
 Google.

 73  Don  K5AQ

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Re: [Elecraft] Installed K3EXREF

[George Dubovsky]

List,

I know a thing or three about those Trimble T'bolts; I am a design engineer
for the company that made the (previous generation) equipment that is now
being surplussed in several parts of the world. There is no domestic or
Chinese thunderbolt; there is the commercial version (silver and red case
with internal dc-dc converter - runs off of 24 VDC) and the OEM version
(thin gold case, sometimes with the original 3 dB splitter still attached to
the case, no power supply). The OEM version being surplussed contains the
same GPSDO guts as the commercial version, with two exceptions: the power
connector is on the opposite side of the pwb, and one Zener diode is changed
to move the trip point for the DC Power alarm to a lower value. Also, the
newer units have a later date code Dallas Semi temp sensor that does not
report temperature in the finer steps of the earlier date codes - this is
not an issue for most folks.

The OEM units require +5 , +12, and -7 to -12 VDC at modest current
requirements. It is easy to find a surplus power supply that supports these
units and it is just as easy to roll your own. I usually have a few tested
OEM units available for sale, with or without the gold case (if you want to
build it into your own cabinet).

In addition, if you want the ultimate K3 accessory, I have a NIB Symmetricom
Starloc II Plus, GPS-disciplined Rubidium oscillator for sale.

Let me know if you want to know anything else about the Thunderbolt, or if
you want one of your own.

73,

geo - n4ua

On Sun, Mar 20, 2011 at 9:05 PM, Jerry Muller l...@k0tv.com wrote:

 This was an excellent explanation.

 I got a Trimble Thunderbolt off eBay for less than 200 bucks. It came from
 China and came with an antenna and power supply. If you are going to get
 one
 of the ones that come from China, make sure you get the power supply with
 it. The domestic Thunderbolts have a unipolar supply but the ones from
 China
 were specials and require a special bipolar power supply. As long as you're
 getting the power supply with it, you're OK. I have not noticed any noise
 from the power supply from China. I expect ferrites may solve the problem
 if
 found.

 It works just fine with the stock Thunderbolt software. I've had mine for
 about 6 months and I've run tests using the Thunderbolt software. The PC
 monitoring software allows you to monitor the errors detected and log them.
 The accuracy is quite good. Although I see occasional errors greater than 1
 part in 10^9, most of the measured errors are far less than 1 part in 10^9.
 I can't find any of the spreadsheets I generated (from many hours of
 operation) right now but I seem to recall that 1 sigma was down around 1
 part in 10^10. This translates into a 1 Hz error at 10 GHz. The +/- 1 Hz
 error in the K3 is much greater than the accuracy of the GPSDO

 My primary reason for getting the GPSDO was for microwave and EME
 operations. Being able to use it with the K3 is a plus. I'm likely to be an
 early adopter of the production units when they become available. I will
 probably order my second K3 with a K3EXREF.

 Jerry - K0TV

 - Original Message -
 From: Paul Christensen w...@arrl.net
 To: elecraft@mailman.qth.net
 Sent: Saturday, March 19, 2011 9:34 PM
 Subject: Re: [Elecraft] Installed K3EXREF


 I installed it on Friday in about 30 minutes, but I'm comfortable with my
  way around the K3.  I would think that most users could install it in
  about
  an hour or less.  Installation is actually very simple with very few
 parts
  involved.  K3EXREF came with an SMA connector and SMA to BNC
  between-series
  adapter.
 
  Performance is exactly as promised by Elecraft.  Although K3EXREF will
 not
  phase lock the K3 to the external frequency source, I'm finding that it
  stays within 1 Hz on 20m when locked to CHU at 14.670 MHz.   I'm also
  finding that testing for zero-beat to WWV at 10 MHz is not a good idea in
  my
  shack, and perhaps yours too.  There are many 10 MHz signals being
 emitted
  by nearby appliances, LAN routers, security system, Ethernet boards, etc.
  That common, even frequency is everywhere in a household these days.
 
  In much of North America, CHU is an excellent source for testing since it
  keeps cesium accuracy like WWV but the odd frequency of CHU is a real
  benefit since the chance for beating against extraneous signals is much
  smaller than at 10 MHz.  Testing at a higher frequency rather than say
 the
  MW broadcast band also provides for a reasonably good account of how the
  K3EXREF performs.   After installation, I would also suggest not trying
 to
  test zero beat K3EXREF against commercial MW or SW BC stations since
 their
  carriers are allowed to deviate much more than the cesium-based time and
  frequency standards of CHU and WWV.  Commercial AM broadcast station
  frequencies are typically only accurate to about +/- 20 Hz although most
  are
  better than that.
 
  The K3's 49 MHz oscillator is only adjusted at intervals 

Re: [Elecraft] 250hz Filter - Audio drops

[George Dubovsky]

This bit me a few months ago: You probably have RX EQ boosted, and this is
disabled for 100/50 Hz DSP filltering.

73,

geo - n4ua

On Mon, Jan 3, 2011 at 5:33 PM, Tommy Alderman alderm...@windstream.netwrote:

 This is driving me crazier!
 My narrow filter is 250hz (FL4). FL4 cuts in when I change my DSP filtering
 to 250 hz, as it should. FL4 stays in as I make DSP more narrow, all the
 way
 to 50 hz.
 The problem is that when I change DSP from 150hz to 100hz or to 50hz, my
 audio output seems to drop tremendously, to the point I have to increase
 the
 AF gain to hear the intended signal. The audio does not come back to
 'normal' level until I change DSP from above 100hz bandwidth.
 I have FL4 set for 2dB gain; FL4 FRQ set to 0.00.
 Would appreciate any suggestions to fix this as I hope it is not 'normal'
 operation?
 Tom - W4BQF


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Re: [Elecraft] K3

[George Dubovsky]

Well, as a recent convert (September), I agree you made a fine choice. I ran
Icom IC-765's for the last 20 years (all cw) and, while I still think the
765 is one of the finest cw radios ever made, the filtering of the K3, and
the excellent sub-receiver, are a significant step up. I wrung it out in cw
Sweepstakes and it performed up to expectations.

I don't know what you had before, but you'll love the K3 performance (which
is, as you no doubt grokked from this site, a moving target ;-) and you'll
be constantly challenged by the near-infinite collection of features buried
in the menus. But you DEFINITELY won't be disappointed by the Elecraft
community support!

73,

geo - n4ua

On Fri, Nov 19, 2010 at 5:31 PM, Scott Weiss s.weiss...@gmail.com wrote:

 Eagerly awaiting my first K3. I work predominately CW with a touch of SSB.
 I'm very impressed with this reflector and all the help and advice one can
 receive. Looking forward to heating up the CW bands and using all the new
 bells and whistles of my K3. Happy Holidays to all.

 Scott Weiss  N2WF
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Re: [Elecraft] Elecraft Digest, Vol 79, Issue 18

[George Dubovsky]

DC for variable-speed has been largely supplanted by ac, multiphase motors
over the last 20 years. There is ac-dc conversion in the front end of the
controllers, but it is then followed by dc-ac single or, more commonly,
three-phase, variable frequency generation. That's usually the source of the
noise. The quietest (EMI) variable-speed drives are the ones that most
closely generate a sinusoidal waveform. Since that costs money, most are
kinda noisy. There are input and output line filters sold for variable-speed
drives, and sometimes they are available on epay. Hitachi is one of the big
manufacturers of VSDs  that comes to mind.

73,

geo - n4ua

On Wed, Nov 10, 2010 at 3:40 PM, BOB PHILBROOK k9...@msn.com wrote:

 DC motors?  BEt so if they are variable speed.

  If so, AC to DC conversion might be part of your source of RFI.

 Bob, K9PAG
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[Elecraft] [K3] 10 dB audio drop with 50/100 Hz DSP filters

[George Dubovsky]

All,

I have a relatively new K3, s/n 4545; I just upgraded to the latest FW using
the latest utility, but the problem predates that. I have 2.7 KHz, 5 pole
filters, 1.8 kHZ and 250 Hz 8 pole filters in both the main and sub
receivers. I have zero offset set for all of the 8 pole filters. When I
first was learning my way around the radio in September, I noticed that the
audio level would drop noticeably when I decreased the DSP filtering from
150 Hz to 100 or 50 Hz, both on the main and the subreceiver. A quick check
with a friend indicates that his K3 doesn't do this. I hung a scope across
the headphones to verify that it wasn't my imagination, and then I found the
AFV readout. It confirms that the audio out drops by almost exactly 10 dBv
going from 150 Hz to 100 Hz, and then does not drop further going to 50 Hz.

My test setup is a stable 8640B set to 14.100 MHz, -73 dBm sig level, AGC-S,
centered up in the passband. When I switch in 100 or 50 Hz DSP filtering the
audio drops, and slight retuning either side only make it worse. This is all
with the 250 Hz 8 pole filter switched in. Because both the main and sub
behave identically, I assumed it wasn't just an 8 pole filter with non-zero
offset, but just to test, I offset the 250 Hz filter in the main rx by + and
- 0.25 and the step audio change was still there, although the absolute
audio level was lower with the filter offset from zero, indicating (to me)
that zero offset was close to correct. I have also tried switching between
FIR and IIR filtering to no effect.

I keep thinking this is something I have accidentally changed somewhere in
the initial setup of the K3, but several readings of the Menu and Config
sections of the manual only made my headache worse.

Please, what am I missing?

73,

geo - n4ua
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Re: [Elecraft] [K3] 10 dB audio drop with 50/100 Hz DSP filters

[George Dubovsky]

John, Lyle, RX equalize was it! Thank you very much - I never would have
found that one on my own.

73,

geo - n4ua

On Sat, Oct 30, 2010 at 8:18 PM, Lyle Johnson k...@wavecable.com wrote:

 You probably have the Rx equalizer set to boost audio at the tone
 frequency you are using for these measurements.  Set it to flat - Rx EQ
 is not in effect at 50 Hz and 100Hz selectivity of the K3.  It is on my
 list of possible DSP code changes.

 Meanwhile, if you really want to use Rx EQ in CW, set the PEAK to 0 dB
 at and just use CUT to shape the passband you want on either side of
 your chosen PITCH.

 73,

 Lyle KK7P

  Please, what am I missing?

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[Elecraft] pending price increase

[George Dubovsky]

All,

Has there been an official announcement of the implementation date of the
Elecraft price increases?

73,

geo - n4ua
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[Elecraft] K3 serial numbers

[George Dubovsky]

Out of curiosity, approximately what serial number of K3 is currently
shipping?

-- 
73,

geo - n4ua
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Re: [Elecraft] Seems to be confusion!

[George Dubovsky]

No, no - you send him your K3 s/n and that is what is engraved on the knob.
At that price (which is not unreasonable for short-run machining and
finishing, by the way) you would want theft protection.

73,

geo - n4ua

On Fri, Apr 23, 2010 at 9:34 AM, Philip Leonard WVØT leoli...@seidkr.comwrote:

 Now that would be neat.  A Certificate of Authenticity complete with
 matching serial number (the knob does have a serial number, yes?) that
 is suitable for framing.  I like it!

 Philip

 Mike wrote:
  $105 per share? Maybe a certificate comes with each knob.
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-- 
73,

geo - n4ua
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