[Elecraft] For Sale PX3-K

[Mike Maloney]

I have complete PX3-K as packaged by Elecraft for sale.  Panadapter kit for the 
KX3.   Asking $560 ppd CONUS.    Contact off list.
73, Mike AC5P
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[Elecraft] KPA/K3 AUX Cable FS

[Mike Maloney]

Anyone have an interest for subject cable UNUSED in original packaging?    
Contact OFF list.
Mike AC5P
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Re: [Elecraft] KPA500 Fan Question

[Mike Maloney]

 Your resting temperature at 42C seems TOO warm to me?   My KPA resting temp 
runs about the same as ambient temperature of shack, 25-30C.   With 25-30W 
drive from TS-890,my KPA seldom reaches 3rd stage 60 degrees.   Have you 
checked SWR or cable between 890 and KPA?  
73, Mike AC5P
On Sunday, May 14, 2023 at 12:38:56 PM CDT, James Bennett via Elecraft 
 wrote:  
 
 Yes, but the amp is not seeing the mis-match, correct? The tuner is taking 
care of that mis-match and I would have thought that the amp should be 
perfectly happy… Yes?

> On May 14, 2023, at 11:35 AM, Dr. William J. Schmidt  
> wrote:
> 
> You are trying to transform a mis-match and that burns energy.  That’s why 
> the fan is running.
> 
> 
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net  On 
> Behalf Of James Bennett via Elecraft
> Sent: Sunday, May 14, 2023 12:24 PM
> To: Elecraft Reflector Reflector 
> Subject: [Elecraft] KPA500 Fan Question
> 
> Got a question (problem?) regarding the fan in my KPA500. I'm driving the amp 
> at 29 watts from a Kenwood TS-890S. The amp is connected to a KAT500, which 
> in turn is hooked to a 30 foot tall Zerofive flagpole vertical. The tuner has 
> provided me with a nice 1.2:1 SWR, as displayed on the amp. The resting temp 
> of the amp shows 42C. At 29 watts input to the amp, I’m seeing about 480 
> watts of power from the amp. The amp has nothing sitting on top of it, and 
> the wall behind it is over 12” away. There is about 2” clearance on either 
> side of the amp, and it is sitting on top of the KAT500.
> 
> The issue: The fan comes on in a very short time - less than 20 seconds - and 
> the temp display runs up to 50+ degrees. If I start calling CQ or get into a 
> QSO, it doesn’t take long for the temp to show over 60 degrees and the fan is 
> running at max.
> 
> When I had a K3 and more recently, a K4D - this did NOT happen. The fan would 
> come on but NEVER at the max, loud level. Interestingly, many moons ago I 
> also had a KX3 and had it connected to the KPA500. I noticed that the fan 
> would also come on fairly quickly with that rig driving the amp, but I never 
> thought too much about it. Until now...
> 
> But now, I think there is some sort of problem. It seems to me that the temp 
> shouldn’t get that high that fast nor should the fan start roaring in that 
> short amount of time. I could understand it if the SWR was really bad, but at 
> 1.2:1
> 
> Any ideas why the amp fan should be acting this way with a non-K3 or non-K4 
> driving it?
> 
> Jim / K7TXA
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Re: [Elecraft] KPA500 transformer removal

[Mike Maloney]

 Am guessing that toroid transformer is 70% or more of total KPA mass?
Has anyone put it on a scale and remembed its weight? 
Be sure to seat and torque bolt properly when putting it back in.  
Mike AC5P
On Tuesday, November 22, 2022 at 07:50:22 AM CST, Michael Walker 
 wrote:  
 
 Not really.

Just label the wires so you know were to put them when it comes back.

Undo the bolt and pull the big torroid out.  You'll notice the KPA500 is a
lot lighter now.  :)

73, mike va3mw

On Tue, Nov 22, 2022 at 6:42 AM  wrote:

> I am sending my KPA500 to Watsonville for service. The shipping
> instructions
> say to "remove the transformer unless otherwise instructed."
>
> Are there any instructions for transformer removal? I've looked at the
> assembly instructions and it seems straightforward.
>
> Are there any potential pitfalls that I should be aware of?
>
>
>
> Dave N1IX
>
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[Elecraft] KXV3A For Sale

[Mike Maloney]

Unused KXV3, (K3 Xverter I/O, RX Ant I/O) accessory kit with install 
instructions FS for K3.   $100ppd CONUS. Contact direct off list.
Mike AC5P
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Re: [Elecraft] Elecraft KPA500 sn 1910 dead

[Mike Maloney]

 I was gifted a KPA-500 in Aug. 2019.  Used about a month before It blew a main 
line fuse.   That was replaced and the amp remained dead.  What happened was 
the center bolt holding the power transformer was not torqued down properly and 
when the amp was tilted the core shifted into the low voltage supply and 
damaged it requiring replacement at the Elecraft shop.    Hopefully, that is 
not what knocked out your 12 volt supply?
73, Mike AC5POn Monday, January 17, 2022, 12:52:13 PM CST, Jack Brindle via 
Elecraft  wrote:  
 
 I would not go by this. Many, if not most, KPA500s do not have noticeable hum 
when powered. Neither of mine do except for once in a while when the line 
voltage increases for a short time.

If yours does have noticeable him, you may want to check the tightness of 
mounting nut for the power transformer and retighten if needed (assuming it 
bothers you). There is a spec for the tightness of that nut. I believe it can 
be found in the assembly manual, if not also in the operating manual.

73,
Jack, W6FB



> On Jan 17, 2022, at 3:08 AM, Dave  wrote:
> 
> When the rear power switch is turned on, you should hear a hum from the
> transformer. The noise level from my KPA500 is quite audible from 2 or 3
> feet away with everthing else turned off. If you don't hear the hum, it's
> likely there isn't power reaching the transformer.
> 
> 73 Dave G4AON
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[Elecraft] OT; large ferrite toroid core?

[Mike Maloney]

We were gifted a somewhat large (6"OD, 2.6" ID, 9/16" thick) ferrite core of 
unknown mix and original use.   On face was marked 6.6uH w/4turns.   My 
thinking it might make a good common mode RF choke on the output of an inverter 
generator or on coax feedline.    Not familiar with properties of toroid cores 
of this size.   Any ideas?
73, Mike AC5P
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Re: [Elecraft] Chasing paddles around desk top

[Mike Maloney]

 A short strip of friction tape under the feet works well also.  
Mike AC5P
On Thursday, July 8, 2021, 03:07:37 PM CDT, Walter Underwood 
 wrote:  
 
 Yep, Museum Wax is the good stuff.

https://www.amazon.com/Quakehold-66111-Museum-Ounce-Clear/dp/B000FJU29U 


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

> On Jul 8, 2021, at 12:47 PM, Steve Lawrence via Elecraft 
>  wrote:
> 
> Or Museum Wax which holds indefinitely, is easy to move/remove and leaves no 
> marks.
> 
> Steve WB6RSE
> 
>> On Jul 8, 2021, at 12:38 PM, Frank Krozel  wrote:
>> 
>> And there goes my secret
>> 
>> -73-  Frank    KG9H
>> kg9hfr...@gmail.com
>> 
>>> On Jul 8, 2021, at 2:34 PM, Art Nienhouse  wrote:
>>> 
>>> Gwen
>>> Try this trick dust off the desk top ...wet fingers wipe the rubber feet 
>>> with wet fingers (spit) works place the paddle down it will stick its self 
>>> to the operating surface nicely.
>>> Regards
>>> Art
>>> ka9zap
>>> 
> 
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Re: [Elecraft] KPA500 cabinet buzz

[Mike Maloney]

 The KPA-500 transformer should be more than just a "hair" away from sides 
(step 6 above) as there are rubber bumpers and a ribbon cable between that 
should NOT be pinched.  Refer to Kit Assembly Instructions page 35 and figure 
52.
Mike AC5P
On Sunday, May 30, 2021, 07:29:59 AM CDT, Eric Norris 
 wrote:  
 
 There is KPA500 buzz (normal), and KPA500 BUZZ (abnormal).  I own two.

KPA Numero Uno was bought way back when, when the kits were first
available.  When I first built it, it buzzed something akin to to your
teeth clacking when you notice a full-grown T. Rex is standing next to
you.  At that time, many were complaining about KPA500 buzz, but one must
understand that some would complain that their K3 did not come with the
case stuffed with Krugerands.  A call to Support convinced them it was
really loud.  They sent me an updated bolt, washer, and spacer set.  I very
carefully repositioned the transformer, and torqued the bolt to factory
spec.  Several times.  No buzz then, no buzz now that I can hear.  I do now
have an LP-100A sitting on the top left forward of the cabinet.  A perfect
fit.  Perhaps that is a dampner, who knows.

KPA500 Numero Two-o was bought this year, is factory-built, and has a very
slight audible buzz on cw.  These amps have compact, toroidal, linear
transformers that produce a little buzz.  If it ever rises to an annoying
level, I would:  1)  Turn off the amp using the front-panel switch to drain
the filter caps and let the fan run all the way down.  2)  Turn off the
rear-panel switch.  3) Unlug the amp from A/C.  4.  Remove the top cover as
shown in the manual.  5)  Using a very strong light, see if the transformer
is touching the cabinet.  6)  If so, you can SLIGHTLY.  loosen the bolt
(PAY ATTENTION TO THE TIGHTNESS OF THE BOLT IF YOU DO NOT HAVE A TORQUE
WRENCH), and very, very carefully adjust the transformer so it is a hair
away from the cabinet on all sides.  7)  Reverse the steps.  Repeat if
necessary.  OR  Call Support.  OR wear headphones.  OR Fuggedaboutit.
NOTE:  You can indeed make it worse.  The reason you are probably hearing
it for the first time is that all amps I have owned with linear supplies
also buzz, but the constant fan masks it.


73 Eric WD6DBM

On Sat, May 29, 2021, 5:57 PM k2qo  wrote:

> After much searching, this 2.4 year old thread is the only info I can find
> on
> this issue. I bought a factory built KPA500 a few months ago and mine
> buzzes
> on CW key down. Af first I thought maybe this is normal as I never owned an
> HF amp. Now I think it is a problem.
>
> Any know how to fix this? I can shoot a short movie if that helps.
>
> 73,
> Mark K2QO
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] External Speaker

[Mike Maloney]

 Have you tried a deflector tube on the internal speaker to direct the sound 
toward your head/ears?  
Mike AC5P
On Thursday, April 1, 2021, 01:18:45 PM CDT, Louis Visconti 
 wrote:  
 
 Can some one point me to a decent external speaker for my K2. Thanks.

Lou, KD2MU


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[Elecraft] K3 age?

[Mike Maloney]

I inherited K3 s/n 7105 without original invoice and was curious to its birth 
date?    Anyone have a close serial with their order date?  
Thanks,
Mike AC5P
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Re: [Elecraft] Cheap Keyer Paddle

[Mike Maloney]

 Here is another idea.  Search Te-Ne-Ke CW key at youtube.com   Mike, AC5P
https://www.youtube.com/watch?v=2PZantLJRwc 



      On Monday, September 21, 2020, 10:46:55 AM CDT, Rich NE1EE 
<73.de.ne...@gmail.com> wrote:  
 
 On 2020-09-19 10:27:-0400, Wilson  Lamb wrote:
> 
>https://www.youtube.com/watch?v=Sps6gsqwzws
>
>I love the paper clamp idea!  
>https://www.youtube.com/watch?feature=youtu.be=RtEYI4aF7j4=desktop

Great, clever ideas! Thanks! 

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Re: [Elecraft] [OT] WWV Time Transmissions

[Mike Maloney]

 Does anyone know any engineers who are hams at NIST, Fort Collins, CO?I be 
curious to know the RF loading coil and ground currents under the 0.024 wave 
stub  verticals for 5000M WWVB.
Mike AC5P
On Tuesday, September 1, 2020, 09:17:41 AM CDT, n6...@outlook.com 
 wrote:  
 
 Bill,
WWVB added a new modulation format starting around 2012/13 that includes a 
phase shift that some older clocks can no longer resolve. If you're technically 
inclined the internet is loaded with fixes for some older clocks as well as 
further information on this topic like 
.

Gary, N6LRV


From: elecraft-boun...@mailman.qth.net  on 
behalf of Bill Frantz 
Sent: Monday, August 31, 2020 5:44 PM
To: Elecraft@mailman.qth.net 
Subject: [Elecraft] [OT] WWV Time Transmissions

I had a friend ask me if something has happened to WWV's time
transmissions. He says the clocks in his home and his watch are
no longer syncing correctly. I think these are syncing to
signals at about 60KHz.

Does anyone know anything about this?

73 Bill AE6JV

---
Bill Frantz        | "The only thing we have to  | Periwinkle
(408)348-7900      | fear is fear itself." - FDR  | 150
Rivermead Rd #235
www.pwpconsult.com | Inaugural address, 3/4/1933  |
Peterborough, NH 03458

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Re: [Elecraft] Current Draw on 20M

[Mike Maloney]

 FWIW, my old K3 (Nov'08) only pulls 17.8Adc at 12.5V for 100W into 50ohm dummy 
load at 14MHz.  
Seems to follow your PA temp is gonna run hotter also.  WHY such poor 
efficiency Elecraft, (Wayne) ?
73,Mike, AC5P


On Friday, June 19, 2020, 12:03:45 PM CDT, Randy Farmer 
 wrote:  
 
 Mine does exactly the same thing. I even ran it through factory service 
to be sure there wasn't a problem with the LPF module that might be 
causing trouble. They calibrated it and returned it with a clean bill of 
health. It still draws significantly more current on 20 than on any 
other band.

73...
Randy, W8FN

On 6/19/2020 8:46 AM, Rich wrote:
> I just received my K3S back from repair and all seemed OK. However it 
> appears to draw much more current on 20M than any other band.   22 - 
> 24 amps.  I have tried two different 20m antennas and a dummy load.
>
> All other bands are 20 amps or lower.  Some as low at 17amps.
>
> Power Supply voltage per K3s display 14.0v standby and 13.3 on TX
>
> First off is this actually something of concern?
>
> I hate to do a calibration as it was just done by Elecraft service two 
> weeks ago.
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Re: [Elecraft] [OT] Birds and DX

[Mike Maloney]

 Stick some toothpicks in strip of styrofoam.  
Mike AC5P
On Sunday, June 7, 2020, 11:14:11 AM CDT, k...@juno.com  
wrote:  
 
 Contact the Audobon Society to see if you can have a nest for a bird of
prey (falcon perhaps).  Hopefully, it is one that will like crows as
well...

73 de Ed


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Re: [Elecraft] Self-fusing liquid electrical tape

[Mike Maloney]

 Don,   Are those all 8 ft ground rods driven vertical in ground without help 
from a rock drill?   Lots of rock in your area?  Mike AC5P
On Friday, June 5, 2020, 03:10:11 PM CDT, W2xj  wrote:  
 
 To my mind, false economy. 

Sent from my iPad

> On Jun 5, 2020, at 3:36 PM, Don Wilhelm  wrote:
> 
> 
> That is why I used the mechanical clamps.  I have 10 ground rods for a 
> perimeter ground wire around the house, 6 on the perimeter ground around the 
> workshop building (where the antenna feedlines first enter) and another 4 in 
> the antenna field.  A total of 20 Cad Welds would have exceeded my budget - 
> the #4 copper wire was expensive enough!
> All the clamps are above ground a bit, so I can check the tightness with a 
> wrench at least once a year.
> In most cases, the perimeter wires are folded back on itself to fit into the 
> clamp, so the wire is continuous rather than having cut ends.
> Yes, even the utility ground rod clamp is exposed.  The building inspector 
> frowned on it until I told him why and he allowed it because I do not (will 
> not) mow grass near any of the ground rods.
> 
> 73,
> Don W3FPR
> 
>> On 6/5/2020 2:55 PM, Bob McGraw K4TAX wrote:
>> Just look at $11.00 per ground rod connection for Cad-Weld as compared to  
>> $1.98 for a mechanical clamp.  Which do you think a ham will choose ?
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[Elecraft] FS: KPAKAUX cable set

[Mike Maloney]

New unused AUX Cable set Optional KPA500 or KPA1500 to K3S/K3.  Wont play with 
my older K3 version with serial port.   Asking $30 shipped CONUS only.   
Mike AC5P
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[Elecraft] KPA-1500 PS pics?

[Mike Maloney]

Anyone have link/s to INTERNAL photos of the KPA-1500PS?   No find on google 
image search.  
73, Mike AC5P
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[Elecraft] KPA-500 failure

[Mike Maloney]

Anyone else have their KPA-500 crash on power ON?   All LED's briefly flash 
then all dead.  Main fuses good.  
73,  Mike AC5P
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[Elecraft] case for KX3?

[Mike Maloney]

Anyone had experience packing a KX3 in an Apache 1800 waterproof case from 
Harbor Freight?   Saw the case today at HF and looked like it would fit okay 
for good transport protection.  
73, Mike AC5P
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Re: [Elecraft] KPA500...standby vs. operate

[Mike Maloney]

 My kpa shows HV 76 both in standby AND operate.  Drops to 61V, key down, 500W 
output.  AC line input drops from 124 to 122V at same time.  
Mike AC5P
On Sunday, October 27, 2019, 03:19:39 PM CDT, Wes  
wrote:  
 
 You are putting it into standby two places.  Don't you mean "operate" for the 
second list of things?

I have a K-Pod button dedicated to turning VOX on and off.

Wes  N7WS

On 10/27/2019 11:54 AM, Jack Brindle via Elecraft wrote:
> The specific answer to your question isn’t in the hardware, but rather the 
> firmware. With that in mind,
> going to STBY does the following:
> 1) Bypasses the TR switch, so that the signal path goes direct between the 
> input and output RF ports.
> 2) Turns off the 60V power to lessen the load.
> 3) It also does some housekeeping things like turn on and off LEDs.
>
> Going into standby adds a few things to the obvious:
> 1) Check that the 270V bias power is valid,
> 2) Enables the TR switch (removing the signal bypass)
> 3) Enables 60V power.
> 4) Again, some housekeeping chores are performed.
>
> Now, what do I do when leaving the op position even for a few minutes? I 
> always put the KPA in STBY mode. It just seems safer that way.
> But, I don’t really see much issue with leaving it in OPER mode.
>
> I also have a habit of disabling K3 VOX when I get up. Again, safer.
>
> 73!
> Jack, W6FB
>
>

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Re: [Elecraft] KPA500 with K3s

[Mike Maloney]

 What is LENGTH of this cable?  
Mike AC5P
On Thursday, October 10, 2019, 06:31:59 AM CDT, Dick Dievendorff 
 wrote:  
 
 
See pages 15, 16, and 27 of the KPA500 Owner's manual for a description of
what the 15-pin ACC cable can do for you.

It amounts to band information both ways so the amp can switch bands from
the K3's band information before you provide RF, the KPA500 front panel band
buttons can bandswitch the K3, and K3 drive power can be set to two
different levels based on the amp's OPER/STBY switch. My K3 provides 30
watts when the amp is in OPER, and 100 watts when the amp is in STBY.

73 de Dick, K6KR



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Dave Sublette
Sent: Thursday, October 10, 2019 04:15
To: Elecraft Discussion List 
Subject: [Elecraft] KPA500 with K3s

Good morning,

I am building the KPA500.  I have the K3s.  Can anyone explain, in simple
terms, what advantage there is in using the KPAK3AUX cable instead of just
using the Key Line cable?

Thanks,

Dave, K4TO
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[Elecraft] KX3 sidetone booster

[Mike Maloney]

Getting a nice boost from the stock speaker (MON level 2) at my preferred pitch 
of 500Hz.   Booster is a 12-3/4 inch piece of 1-1/4" PVC tube (1-5/8"OD) with 
one end cut at 30 deg. Placed approx. 1/8 inch from the speaker holes gives the 
best gain.   Tube would be slightlyshorter for higher pitch tone.  Easy to find 
the peak by swinging the pitch tone.   A slider sleeveon the end allows 
adjusting to desired pitch.   For CW ops it is really nice having the 
additionalaudio boost at your preferred pitch.   I pass this on FYI to those 
who may like to try it themselves.  
73,
Mike AC5P


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Re: [Elecraft] KPA500 - Advantage of min fan speed?

[Mike Maloney]

 Thanks Mike for the KPA-500 fan level settings.  That answers the question I 
was going to ask.   Could find no fan level info in the owners manual or from 
previous posts.I don't suppose any record kept of SPL  readings at the 
different levels?   Anyone done that?  
73, Mike AC5P

On Sunday, September 29, 2019, 10:08:41 PM CDT, Michael Walker 
 wrote:  
 
 Here are the thresholds 


level 1: 50 degrees 
level 2: 55 degrees
level 3: 60 degrees
level 4: 65 degrees
level 5: 70 degrees
level 6: 80 degrees

if the temperature gets above 90 degrees we throw a fault and drop into standby 
(with fault showing).

Mike va3mw

> On Sep 29, 2019, at 10:38 PM, Andy Durbin  wrote:
> 
> The KPA500 offers a minimum fan speed setting which is settable by menu or 
> serial command.  Some posters have advocated setting a minimum fan speed 
> higher than zero, presumably thinking it offers some advantage in thermal 
> management.
> 
> Does anyone have any hard data that shows that the KPA500 runs cooler, or 
> with lower peak fan speed, when minimum fan speed is set above zero.
> 
> Running a rigorous test may not be easy since it would seem to require the 
> same ambient temperature, same finals starting temperature, same TX periods, 
> and same antenna system load.
> 
> I'm curious because, before CQ-WW-RTTY I configured my KPA500 to set min fan 
> speed to 1 at start of TX and reset min speed to zero 30 seconds after stop 
> of TX.  Of course the fans ran faster than min speed during TX but I don't 
> have any feel for whether the higher speeds were any more protracted than 
> before the min speed change.
> 
> Please share you experience of using min fan speed greater than zero, and any 
> data if you have it.
> 
> 73,
> Andy, k3wyc
> 
> 
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[Elecraft] Changing KX3 pitch ?

[Mike Maloney]

I recently inherited a KX3.  I can see what CW pitch setting is (550), BUT not 
been able to change it (to 500) with VFO A or B.  "Set sidetone pitch"  on page 
16 of manual does not say how to CHANGE it?  What's the trick?
73, Mike AC5P 
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[Elecraft] OT: ARRL Handbook request

[Mike Maloney]

Does anyone reading have a 1937,1938 or 1939 ARRL Radio Amateurs Handbook?   
Please reply direct off list.  Thanks
73  Mike AC5P
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Re: [Elecraft] PS Comparison: Powerwerz SS-30DV vs. MFJ-4230MVP

[Mike Maloney]

 Could the Powerwerx SS-30DV be the same supply as the Tekpower TP-30SWI minus 
the meter and a few dollars more?  Anyone measure the efficiency of the 
Powerwerx, AC input vs. DC output power?  
73, Mike AC5P
On Wednesday, March 13, 2019, 09:03:41 PM CDT, Dennis Moore 
 wrote:  
 
 I have the Powerwerx, relegated to the closet. One year after I got it 
the fan became very loud to the point of being obnoxious. Easy enough to 
replace but unfortunately it isn't available anywhere. BTW, I didn't get 
this one from Elecraft.

Now a nice quiet Astron RS-50M.

73, Dennis NJ6G

On 3/13/2019 10:08, krug261--- via Elecraft wrote:
> Greetings all,
> I am in the market for a compact power supply. The fact that Elecraft 
> suggests/sells a third-party unit (SS-30DV) provides an automatic sense of 
> comfort. However, always trying to complicate life I was also looking at the 
> MFJ-4230MVP. Same dimensions, weight, power connections. I do like the 
> variable voltage control on the MFJ. Not sure why I would need it, but seems 
> useful.
> I doubt if anyone has BOTH units, but even your impressions of either of them 
> would be very helpful.
> Thanks and 73, Bob KA2TQVKX3 #9842
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[Elecraft] Tekpower PS ?

[Mike Maloney]

Anyone on list using a Tekpower TP30SW1 switching power supply?  It is model 
with Anderson power poles on front panel.Please reply direct.  Thanks
73, Mike AC5P
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Re: [Elecraft] Choice of CW pitch

[Mike Maloney]

I get the best response for CW pitch volume from the K3 stock speaker with my 
60 degree deflector horn on top.   The length was determined by experiment and 
gives a very noticeable boost at my desired pitch of 500Hz.  
Mike  AC5P 

On Saturday, September 22, 2018 8:38 AM, Dave Cole (NK7Z)  
wrote:
 

 I had a hearing test a year, or two ago.  I looked at the test results 
and selected a frequency, looking for good response in both ears.  I 
then adjusted the K3 beat note to that frequency, which put the 
frequency of the beat tone in the sweet spot for my ears...  It also in 
general got most stations I was working at that frequency.

It made a noticeable difference for the better in weak signal decoding 
for CW for me...  YMMV.

73s and thanks,
Dave (NK7Z/NNR0DC)
https://www.nk7z.net
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 9/22/18 4:40 AM, Drew AF2Z wrote:
> When you've got a weak signal peaked in a narrow filter or APF, that's 
> the time you'd like to optimize the pitch. Adjusting the VFO/RIT for a 
> different pitch is not really an option at that point.
> 
> You're right though, PITCH as implemented is mainly meant to pick your 
> favorite tone and pretty much stick with it; not for trimming up 
> individual signals like you would with AF/RF gain.
> 
> 73,
> Drew
> AF2Z
> 
> 
> 
> 
> On 09/22/18 07:11, Nr4c wrote:
>> Come on!!!
>>
>> I adjust the “pitch” to suit my hearing. The pitch of the incoming 
>> station is adjusted by the VFO!  The “Spot” button will get you close 
>> to Zero-Beat. A little XIT will separate you from others who Zero-Beat 
>> him in a pile-up.
>>
>> Sent from my iPhone
>> ...nr4c. bill
>>
>>
>>> On Sep 22, 2018, at 6:39 AM, Drew AF2Z  wrote:
>>>
>>> Yes, the K3 cw pitch is easy to set tailor for hearing response and 
>>> speaker/headphone response; at least easier than the K2. For my K2 I 
>>> had written down the filter calibrations for a number of different 
>>> pitches so that I could change them on the fly while operating; I 
>>> recall it took less than a minute to dial one of them in...
>>>
>>> But if you want to adjust the pitch to suit current band conditions, 
>>> filter width and wpm speed of the station you are trying to copy, the 
>>> K3 is not easy at all.
>>>
>>> Let's assume that for any combination of these variables there is 
>>> some optimum CW pitch between 300 - 800 Hz. How do you find that 
>>> pitch for a particular CW signal? There is no easy way because 
>>> whenever you push the PITCH button you can no longer hear the station 
>>> your are trying to optimize. You would have to try every pitch 
>>> selection individually, 300, 310, 320, etc., and somehow remember 
>>> which was the best. Obviously, not a practical way to dial in the 
>>> optimum value.
>>>
>>> 73,
>>> Drew
>>> AF2Z
>>>
>>>
 On 09/21/18 22:02, Erik Basilier wrote:
 The ease of changing CW pitch in the K3 is indeed a great asset in 
 setting
 things up for best copy, and I have found myself using it quite a 
 few times.
 The immediate reason to change pitch has usually been a perception 
 that with
 the existing setting, the best copy pitch does not exactly coincide 
 with the
 CW tuning indicator (another great CW asset of the K3), or with the 
 peak DSP
 filter response. Many times this has led me to change the pitch 
 setting by a
 small amount, whether my general preference du jour is for a low or 
 higher
 pitch. To make such an adjustment I like to set a wide DSP bandwidth 
 and
 slowly tune through a received signal. The apparent loudness doesn't 
 stay
 constant, nor does it follow a smooth variation that I attribute to 
 my own
 hearing response. Instead I hear peaks within range of piches that 
 would be
 reasonable for CW, that I attribute to the speaker and its 
 surroundings. (I
 would say that since I went to the SP3, there is less of this 
 variation, but
 no matter how good the speaker, there will always be such variations 
 because
 objects around the speaker cause reflections. Phones will always be the
 better approach) Rather than adjusting the pitch to some value
 considered ideal based no prior considerations, I set it for a peak 
 in the
 accoustical response of the particular speaker and its surroundings. 
 Then
 going back to normal DSP selectivity I generally find better agreement
 between perceived loudness and centering the received signal in the
 passband, at least until I move things around in the shack...
 73,
 Erik K7TV
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Re: [Elecraft] OT: WWV/WWVH Closure

[Mike Maloney]

Dual 35kW ERP synchronous transmitters and antennas for 70kW ERP at 60kHz.   
Short (for 5km wavelength!) 4x400 ft quad towers that support top hat.  Center 
connected cable is main radiator.    Hard to see getting 35kW ERP out of 100kW 
transmitter at 5000 meter wavelength for such a short stub antenna?   Pattern 
coverage at night is amazing.  Serious copper and currents in loading coil and 
ground grid!  The AC station service transformer is 500KVA.    Info from NIST 
web page.  Interesting stuff.   
Mike AC5P 

On Monday, August 20, 2018 12:57 PM, Roger D Johnson  
wrote:
 

 Ah! LORAN C. I remember it well.

Roger CWO4, USCG (retired)


On 8/20/2018 12:54 PM, Rose wrote:
> Trivia ..
>
> The last I knew the WWVB transmitter is a "repurposed" 100KW
> LORAN C TX from the closed site in ND.
>
> 73!
>
> K0PP
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Re: [Elecraft] KPA-1500 Power Supply Cable Size

[Mike Maloney]

Okay have looked over the posts, but somehow have missed the actual 
AWG(American wire gage) SIZE of the stock DC pair?   Anyone KNOW this or maybe 
even micro-ohm tested (a long shot) it?  Voltage drop (ps to amp) divided by 
full load dc amps would be close enough. 
73, 
Mike  AC5P  

On Tuesday, July 31, 2018 5:44 PM, Jim Brown  
wrote:
 

 On 7/31/2018 2:40 PM, K8ZCT wrote:
> Jim,
>
> Please accept my apologies.
>
> Sorry for giving you Kudo's for the wrong Handbook. I should have stated that 
> you are are a contributor to the 2018 Edition of "The ARRL Handbook". I have 
> many of your articles and to be honest the ARRL "Grounding Book" has a lot of 
> information that is also in the National Electrical Code and IEEE "Green 
> Book".

I also made major contributions to N0AX's ARRL Gounding Book -- much of 
it is based on the Power and Grounding slide show talk that's on my 
website.  And some of what I've written is from the IEEE Green and 
Emerald Books."

> I worked in industry for over 40 years in the power systems distribution
> area, and I was an active member of  the IEEE IAS Power Systems Reliability
> Subcommittee.

The last 25 years of my work life was as a consultant designing large 
sound systems for public buildings -- theaters, stadiums, churches, jazz 
clubs, even the United Terminal at O'Hare.

73, Jim K9YC
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[Elecraft] OT: old ARRL RA Handbook info

[Mike Maloney]

Thanks to the many of you who replied.   Got wanted info pretty quickly.   
Amazing how many are holding on to old RA handbooks.  
73,
Mike  AC5P
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[Elecraft] OT: old ARRL RA handbook

[Mike Maloney]

Would anyone reading per chance have a 1960 or '61, '62 Radio Amateurs Handbook 
handy?Reply direct off list.  Thanks
Mike  AC5P
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Re: [Elecraft] KXPA100 DC current at 20 50 watts

[Mike Maloney]

Interesting readings.  Would have thought KXPA more efficient.   Is this into 
dummy load and what frequency was test?
73, Mike AC5P 

On Monday, March 12, 2018 7:57 AM, Jan  wrote:
 

 Power readings here in Ypsilanti . . .Using the KX3/PX3/KXPA100 for 
several years now AND enjoy it very much; including a keyboard into the 
PX3 for some fun on CW too ~ but mostly use the Navy flame-proof key 
with SKCC activity (# 6099T)

Here are my reading on the METERS on the SEC-1235 power supply  . . . a 
good power supply . . .

At 5W   1.5A  and 14V    KX3 alone

At 10W    3.0A  and 14V    KX3 alone

At 20W    10A   and 14V    KX3 + KXPA100

At 50W    15A   and  14V  KX3 + KXPA100

AT 75 W   17A   and 14V  KX3 + KXPA100

At 100W  23A  and 14V   KX3 + KXPA100

Cheers, Jan  K1ND
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Re: [Elecraft] Items you think you can depend on

[Mike Maloney]

A line voltage monitor/alarm a very good idea.   Am surprised Dave's KPA500 
power transformer core was not humming away at 60hz over excitation before he 
got it off line?Being retired from a large electric utility substation 
department, I know LTC  (load tap changer) controls can sometimes fail.   For 
those on a very rural line it could be an overheadline regulator gone to max 
steps boost (HV) or buck for low voltage.  Usually these are single phase large 
auto-transformers with a plus or minus 10% in 16 steps each side of neutral 
position.  73
Mike AC5P 

On Monday, September 4, 2017 12:33 PM, Mel Farrer via Elecraft 
 wrote:
 

 Funny you posted this.
I monitor BOTH sides of the 110/220 VAC service and have alarms set to trigger 
either line >125 or >250 VAC. Being in the country THINGS happen.
Always expect the unusual.
Mel, K6KBE


      From: David Robertson 
 To: Elecraft  
 Sent: Monday, September 4, 2017 9:39 AM
 Subject: [Elecraft] Items you think you can depend on
  
Everyone,

 Over time we can grow complacent on many service items such as electrical
power, water and other services over time. Well that can be concerning as
many hidden changes can result in damage to your home and equipment.

Late late night I came in to my den and was closing down my ham station
when I notice my fault light on my KPA500 linear was on. I powered it down
and retired for the evening. This morning I powered up the linear (KPA500)
and at once I got a fault light and had a high voltage alert. I powered
down the linear and checked my input line voltage. It was 137 volts RMS! To
be sure it wasn't my imagination I rechecked the voltage with a different
meter with the same result. In checking the 220 volt outlet I measured 274
volts! My linear is set up for 220 volts operation and it was getting over
90 volts HV.

I alerted the neighbors and cut the main breaker to the house. I then
called the power company's service number and reported the problem. A short
time later they called me back and reported that a regulator in the local
sub station had "Stuck" and was reset. In rechecking my line voltage it was
118 volts on the low side and 236 volts on the high side.

In the 12 years we have been at this qth we found that our town's locally
run power company has been very reliable but this experience showed me that
it is not a bad idea to check your line voltage every once in a while.
73

-- 
Dave Robertson KD1NA
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Re: [Elecraft] Wattage Draw - K3S/100 vs KPA500/KAT500 - for UPS

[Mike Maloney]

Oh my!  The KPA500 is more efficient than you give it credit.   Since few have 
instruments to measure ac input parameters, will volunteer actual measurement 
figures.At 650W output into 50 ohm load, highest VA recorded was at 14.1 MHz at 
1166.  Watts 974 with a pf of 0.83 or 83%.   AC input amps 10.3.   Awesome!
73,Mike  AC5P 

On Wednesday, August 30, 2017 7:28 AM, Don Wilhelm  
wrote:
 

 Tom,

That 3000 watts I mentioned is for everything in the station.
The KPA500 alone needs 120 volts at about 13 amps, maybe peaking to 
something greater.

73,
Don W3FPR

On 8/30/2017 8:16 AM, KQ5S-Tom wrote:
> 3000W at 120V is 25 amps.  He had better have a dedicate circuit.  I believe 
> if I had to run a dedicated circuit I would run a 220 circuit for the amp and 
> put everything else on the UPS.
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[Elecraft] OT: Inverter type generators used for FD?

[Mike Maloney]

 Curious if anyone used 2000W inverter type generator for portable FD 
operation?  What brand machine and what experience with RF noise 
encountered?Did anyone use Champion or Predator brand inverter generators?    
Reply direct is fine.Mike  AC5P  
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