Ross Primrose N4RP wrote:
>On 12/9/2011 6:09 PM, Jim Brown wrote:
>>
>>>If it is an automatic antenna tuner, that is less of a problem.
>> Except that the automatic circuitry, and it's power supply must also be
>> isolated from ground. That part of the design problem seems non-trivial.
>>
>
>Se
Gidday from vk,
Any plans from Aptos to have a 70cm option for the K3?
Cheers,
Peter
VK4EA
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just a thought, a highly polished stainless steel outer shell would be really
nice to!!
Ken..G0ORH / M3i
Sent from my iPhone
On 10 Dec 2011, at 01:33, "Eric Swartz - WA6HHQ, Elecraft"
wrote:
> Hi Mike,
>
> We're going to look seriously at the SS screws for all products.
>
> We'v
Okay gents. I'm convinced. I do like a good exchange.
73, Mike NF4L
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Thanks for all the replies. Looks like I will order the aux cable.
73, John N1JM
--
View this message in context:
http://elecraft.365791.n2.nabble.com/Aux-cable-for-KPA500-tp7078405p7081343.html
Sent from the Elecraft mailing list archive at Nabble.com.
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At 03:03 PM 12/9/2011 -0800, you wrote:
>In the 1960's one very popular and cheap H.F. antenna was the folded dipole.
>Often they were made from the ubiquitous 300 ohm "twin lead" used on TV
>antennas and fed with the same twin lead since the impedance of a folded
>dipole is close to 300 ohms. The
Hi
I have the stainless steel kit (tho' still not installed and I have no rust)
but all these messages about rust led me to remember this:
http://www.youtube.com/watch?v=PRKmkybIaqc
hope you enjoy - and sorry for the OT... Eric will be closing it soon
anyway :-)
73 John VE3NFK
--
View thi
I bought my K1, fully assembled, about a year ago. I've recently noticed
that when I transmit that there are no emissions. The SWR is showing as
9.9 from the tuner (I can hear all the tuner relays latch and unlatch when
doing the test).
Can anyone help point me to what may be the problem?
73,
E
> It seems that many Hams considered the 4:1 ratio some sort of magic
> number,
> when all it was intended to do was provide a good transfer between 300
> ohms
> and 50 ohms.
I just modeled a typical 20m folded twin-lead dipole using 4Nec2 and TLD
software. Had never tried that one before.
Th
Eric,
The first thing I would check is the coax. The 9.9 SWR indicates a
likely short or open circuit in the feedline.
Try connecting a dummy load with known good coax and see what happens.
73,
Don W3FPR
On 12/10/2011 9:54 AM, Eric Christensen wrote:
> I bought my K1, fully assembled, about a
The down side of the 300 ohm twin lead folded dipole is that 300 ohm twin lead
usually is made from small wire and not mechanically very strong, so it is not
durable for fixed stations with varying weather conditions and the wire is too
small for anything but low power. With either the 300 ohm
>> switchable low-pass filter components that optimize receive
performance when you're listening in the AM broadcast band
The info page states RX down to 1MHz. Is the above saying that
actually it goes down to 560AM as in Commercial AM broadcast?
Sorry if I missed something.
TNX72/7
> "The down side of the 300 ohm twin lead folded dipole is that 300 ohm twin
> lead usually is made from small wire and not mechanically very strong, so it
> is not durable for fixed stations with varying weather conditions and the
> wire is too small for anything but low power. With either the
Advice I read years back cautioned to stay away from the foam dielectric
300 Ohm ribbon lead. The solid dielectric handles more power and
doesn't get water contamination in the dielectric.
How does modeling with 450 Ohm window lead work out? That would suggest
a 9:1 balun. The reason I ask is b
Any one successfully running the K3 Memory Editor under Wine in Linux?
I installed winetricks (http://wiki.winehq.org/winetricks) and the Memory
Editor program appears to function (Spreadsheet like user interface appears)
but the Memory Editor program then never picks up my symbolic links to t
> How does modeling with 450 Ohm window lead work out? That would suggest
> a 9:1 balun.
Someone earlier (K2VCO, I believe) cautioned against falling into the trap
of believing that the characteristic Z of the line is always the impedance
actually present at the end of the line. The Z seen at
On Dec 10, 2011, at 12:38 PM, Paul Christensen wrote:
> I've got new respect for the folded dipole (FD). The bandwidth of the FD is
> about 40% better between 2:1 VSWR points than a straight wire dipole.
Yes, and a 3-wire dipole nearly doubles the SWR bandwidth relative to a regular
dipole.
The .Net framework and Windows versions of the Elecraft Utilities discover Com
ports through registry key/values defined for this purpose. Drivers install
their names there in Windows. I'm away from my code, and don't recall the exact
key but the key has HARDWARE and SERIALCOMM in it. Try this
> The info page states RX down to 1MHz. Is the above saying that
> actually it goes down to 560AM as in Commercial AM broadcast?
Yes. Probably down to 490 kHz, maybe even lower.
Wayne
N6KR
>
> Sorry if I missed something.
>
> TNX72/73,Phillip N8AYE
> -.-. --.- -.. . .
Hello
I have used a center fed zepp for about 20 years. First, I built a classical
tuner with separate coils, one for each band, adjustment with a variable
capacitor and alligator clips on the coils ! Worked fine, but what a delight
when changing bands...
Later on I made a compact tuner, a T mat
My KAT100 is showing the symptoms of fried pin diodes (1N5711). I need
two (or maybe 4, if the KPA100 was affected as well). I might as well
have some in stock, too.
Where can I order a small quantity of diodes (say, a dozen), that won't
charge too much on shipping?
Thanks,
Wayne KF7QGA
I use Mouser (www.mouser.com) or Digi-Key (www.digikey.com).
73,
Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Conrad
Sent: Saturday, December 10, 2011 11:51 AM
To: elecraft@mailman.qth.net
Subject: [Elec
I get my elecraft mail in journal form so my response is delayed. I had to
mention that people who make broad statements about feed lines and antennas
should check the antenna book and handbook before producing the wrong
information.
Here is an example:
"The impedance of the feed line does not
Good advice David, but the earth affects the impedance of a dipole.
When fed at the center a dipole exhibits a 75-ohm impedance in free space.
But, when brought close to the earth (which most HF antennas are,
electrically) the impedance is lowered. At the typical heights most of us
hang our HF wi
A center fed half wave dipole is only 75 ohms in free space (I guess the ISS
qualifies) or at a few specific heights (approximately .23, .46 and .74
wavelengths above ground). At other heights, it varies from as low as 45 ohms
(over real ground) to as high as 100 ohms.
That's why I specifica
Wayne-
I am a bit embarrassed about something that just happened in my shack because i
think i just blew up my external 6m preamp.
I was putting in line my six meter preamp and using a db15 Y connector with my
Yaesu Quadra amp on the other connector. I was not transmitting and just
getting i
At 09:12 AM 12/10/2011 -0800, you wrote:
>The down side of the 300 ohm twin lead folded dipole is that 300 ohm twin
>lead usually is made from small wire and not mechanically very strong, so
>it is not durable for fixed stations with varying weather conditions and
>the wire is too small for any
For sale K-1 s/n 0930 excellent condition w/built in tuner. Too many radios.
$400 + shipping. Will accept PayPal. Pics available. Off list
markf1...@hotmail.com or n...@dfn.com Thanks Mark N5MF
_
While checking a K3/100 #4114 on behalf of SK estate, I find that the power
cannot be set higher than 12 watts.
Operation was normal until I commenced a CAL procedure to correct a 2kHz
difference between 'indicated' and transmitted frequency.
Checked all the menu functions but can't find any ref
You could open it up and see if any 'spare' parts fall out, or if any
of the components on the board look like they have let out their magic
smoke. Missing/blackened traces on the PC board would also be a
telltale sign.
(I am assuming that any failure that actually created a loud noise
ought to be
Hi Mark,
There is nothing physical like burn or open visible to the eye.I will probably
try connecting it to an external power supply and see if that fixes the issue.
Whatever happened it was loud. I wonder if the Y connectors are flawed because
I was also going to hook up my LP Panadapter lat
Keith, please tell all of us your headphones were *not* plugged in when
you had them on and were plugging and unplugging stuff ... we all want
live Elecrafters.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org
On 12/10/2011 1:25 PM, Ke
Fred,
I had them on. Bad idea. I will be more careful.
Thanks,
Keith
Sent from my iPhone please excuse typos
On Dec 10, 2011, at 2:38 PM, "Fred Jensen" wrote:
> Keith, please tell all of us your headphones were *not* plugged in when
> you had them on and were plugging and unplugging stuff .
This particular "technique" using a half wave antenna as an "end fed" wire
can be VERY dicey if you run high power, but as Ron says the efficiency
rises as the ground losses fall. (Percentage wise) A way to get maximum
use of a 100 watter or a QRP rig when your space available is small.
Some
Make sure the KPA100 option is installed and enabled. That sounds like it is
not (the basic K3 has a 10 watt transmitter). Suggest you look in the
Owner's manual and perform the procedures to enable and then test and
calibrate the KPA100. Likely that will point to the problem.
Good luck!
Ron AC
I had to have them off for part of it but def had them on when I put on the
preamp.
Sent from my iPhone please excuse typos
On Dec 10, 2011, at 2:38 PM, "Fred Jensen" wrote:
> Keith, please tell all of us your headphones were *not* plugged in when
> you had them on and were plugging and unplu
Ah, but Sandy, it's so reminiscent of the old shipboard installations! I can
hang a neon or fluorescent lamp on the antenna where it exits the shack and
it'll blink as I pound the key, just like Sparks did, Hi!
But, yes, "direct feed" antennas that come into the shack require care to
insulate and
I did deenergize the equipment during the install. Anyway, something is wrong
and more troubleshooting is needed.
Thanks,
Keith
Sent from my iPhone please excuse typos
On Dec 10, 2011, at 2:38 PM, "Fred Jensen" wrote:
> Keith, please tell all of us your headphones were *not* plugged in when
Hi All,
I never paid any attention to this in the past but am grateful that
Keith brought up the question. I will order a cable myself as at the
moment there is a new requirement for the ACC port at EI2CN. Thank you to
both Joe and Keith.
73 Doug EI2CN
-Original
Just another "old guy" rememberance:
Being 14 years-old and a fresh new Novice, I soldered at PL-259 on
the end of the TV twinlead coming in from my 40m folded dipole and
plugged into the DX-35. The hardy old 6146 loaded it just fine with
the pi-net output circuit. A few years later I learne
Is the KPA100 turned on?
Mike W0MU
W0MU-1 CC Cluster w0mu.net
On 12/10/2011 3:09 PM, Robert Mccormack wrote:
> While checking a K3/100 #4114 on behalf of SK estate, I find that the power
> cannot be set higher than 12 watts.
> Operation was normal until I commenced a CAL procedure to correct a
good eve.. I have noticed that only from 7.181 to approx 7.185 ish there is
distortion of received and transmitted signals, sounds just like rf on both
sides. this issue completely goes away either above or below these freqs and
does not exsist on any other band. Any input would be appreciated..
Could we get more info on this possible fix, how much disassembly is
required? Looks like the PA unit must come out?
Joe N9VX
--
I think I may have solved this problem. One of the other
On 12/10/2011 2:35 PM, Jim Dunstan wrote:
> ... I don't know if anyone uses it for making folded dipoles (I
> suspect not). If one were to construct such a folded dipole for
> any HF band I can guarantee they will not have any power handling
> problems to today's legal power limit.
In this week
I presume you are talking about a K2, correct?
If so, see http://www.elecraft.com/Apps/Alert11_WAOF.html
On 12/10/2011 3:28 PM, tom martin wrote:
> good eve.. I have noticed that only from 7.181 to approx 7.185 ish there is
> distortion of received and transmitted signals, sounds just like rf on
I've been reading the comments about Bird43 accuracy for awhile, but
the claim that the error is fixed amount for all levels of power
measured on a given element just does not agree with my
experience. (Just about) ALL of my RF power measurements have been
using the Bird and what I see is a sc
* On 2011 10 Dec 12:20 -0600, Larry J on Ubuntu 10.04 Desktop wrote:
> lj@lian2:~./wine/dosdevices ls -al com1
> lrwxrwxrwx 1 lj lj 2011-12-10 10:35 com1 -> /dev/ttyS0
>
> My attempts were made under Ubuntu Linux 10.04 and Wine 1.2.2. Thanks for
> any help.
I've never had success with serial
Hi All,
Many thanks - yes PA NOR was and remains enabled but 12 watts is still maximum
power available.
This K3/100 was delivering 100 watts before I commenced the CAL procedure - the
only reason I took the top cover off was to find the FL1 offset, so nothing has
been disturbed.
I've run out o
Try running the TX Gain calibration again.
Mike W0MU
W0MU-1 CC Cluster w0mu.net
On 12/10/2011 5:07 PM, Robert Mccormack wrote:
> Hi All,
>
> Many thanks - yes PA NOR was and remains enabled but 12 watts is still
> maximum power available.
> This K3/100 was delivering 100 watts before I commenc
I would be concerned that going from 5/16 inch to 3/16 inch may be too
much of a difference to assure that the screws have enough thread
engagement. I would think going to 1/4 inch would be a better choice.
This sounds like a simple problem, and the real cause is that the holes
were not tapped
I have built more than 320 K2's to date. Let me build one for you. You will
have a new K2 with the options you want. My prices are reasonable. Please
respond off of the reflector. 73AlanW1HYV
_
I just built #570 last week and was concerned with how 'wobbly' the bracket
was with the 5/16 screws not wanting to over-tighten the screws. But
knowing it should not be that wobbly, I gave a little more torque while
pressing down and they all fully tightened down nicely.
73, Mitch
--
View t
I have a K2 No. 2005 (owned and built since new) with the outboard ATU/100 watt
setup. I rearranged my shack and have been fighting RFI. I believe it had to do
with the routing of the power cables. I think (hope that is!) have fixed it. A
bad Anderson connector (internally loose) on the 100 watt
Rick,
Did you record ALL your menu settings (including the filter settings)
before you did the Master Reset, and have you restored all of those menu
settings after the reset?
If the answer is NO, then you have some calibration and filter setting
work ahead of you.
Go to my website www.w3fpr.co
The weekly Elecraft SSB net will meet tomorrow (12/11/11) at 1800Z on
14.3035 MHz +/- QRM. I will be net control from western Oregon, and we'll
try relays to pull in the stations that I can't hear.
See you there.
73,
Phil, NS7P
__
Ele
Rick,
It sounds to me that once you get over the menu setting situation and
have all your proper options set into the menu, you should then look at
the KPA100 wattmeter circuits to discover what the TUNE problems are -
the resolution of that question may cure other problems.
I am headed for Ca
May not have been your radio at all, but instead might have been a
"surge protected" multiple AC outlet box. I have a few Tripp-Lite
"Isobar" outlet boxes, and if they "catch" a surge, they will make a
VERY loud bang! Fooled me for a while until I figured out what was
happening. Sounds like
Local pick up outside Tucson AZ in Vail. I paid > $ 2,600 and never took
delivery.
73, Chris KF6VCI
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NAQCC Sprint Tuesday night!
Our December sprint is this coming Tuesday evening local time (Dec 13, EST -
8:30-10:30PM, CST - 7:30-9:30PM, MST - 6:30-8:30PM, PST - 5:30-7:30PM), which
translates as Wednesday Dec 14, 0130-0330Z in all cases.
I will refer you to the proper URL:
http://naqcc.info/
Thanks Jim. The preamp is still not functioning but that does describe the
sound.
Keith
Sent from my iPhone please excuse typos
On Dec 10, 2011, at 6:04 PM, "Jim Wiley" wrote:
> May not have been your radio at all, but instead might have been a "surge
> protected" multiple AC outlet box. I
If this is the case one would need to open the outlet box and replace the
"exploded" MOVs.
Or purchase a new outlet strip, open it up, and install an MOV across each
pair of wires (three in all). Try Radio Shack.
Cheers,
Alan V31FA
- Original Message -
From: "Jim Wiley"
To: "Keith H
How do I go about changing from 120-Volt to 240-Volt operation of my
KPA500? I hate to ruin that really
nice power cable by chopping off the plug and substituting a 15-Amp
240-Volt plug; but if that's the way to
do it, I'll get another cable and that way I'll have both AC Voltage (USA)
capabi
The Radio Shack part number for the MOVs is: 276-0568.
Three wires in the outlet strip. Solder an MOV across each pair of the three
wires.
Alan V31FA
- Original Message -
> If this is the case one would need to open the outlet box and replace the
> "exploded" MOVs.
> Or purchase a new
Thanks, Alan. Appreciate it greatly.
Keith
Sent from my iPhone please excuse typos
On Dec 10, 2011, at 7:37 PM, "Alan Slusher" wrote:
> The Radio Shack part number for the MOVs is: 276-0568.
> Three wires in the outlet strip. Solder an MOV across each pair of the three
> wires.
>
> Alan V31F
You might be able to purchase a cord with the 240v USA end on it and the
molded amp plug on the other end. There are numerous types of 220/240
outlets. The other option is buying the cord from Elecraft and cutting
the end off.
Mike W0MU
W0MU-1 CC Cluster w0mu.net
On 12/10/2011 8:36 PM, n..
Elecraft sells a power cord with the Schuko 240 volt connector if that's
what you need.
Also, note that the cord is a standard 3-wire type used on many computers
and other electronics. I bet you can get one at just about any electrical
supply to put whatever plug you need on.
Ron AC7AC
-O
This is a bit more invasive, but a few earlier KPA100 modules had a problem
with the interface connector to the main RF board that carriers the +13V to
the KPA500 itself. The pin corroded and heated and, in a few cases, burned.
I believe the current KPA500's have gold plated connectors. Of course,
Good Evening,
After a long string of sunny days winter has returned. As I was
driving into town for supplies I first saw mist falling. Up here it had
been fog while below it was clearer. When I was near the valley floor
hoar frost was riming the fir trees. At the lowest elevations the
I think he means the KPA100.
On 12/10/11 9:06 PM, Ron D'Eau Claire wrote:
> This is a bit more invasive, but a few earlier KPA100 modules had a problem
> with the interface connector to the main RF board that carriers the +13V to
> the KPA500 itself. The pin corroded and heated and, in a few cases
Phil AD5X posted some info several months ago about a good inexpensive
source of a 240 v cable.C13615P-6 power cord from www.cables.com $12.95
plus shipping.
..Tony K2SG
-Original Message-
How do I go about changing from 120-Volt to 240-Volt operation of my
KPA500? I hate to r
AARGH Yes. I'm sitting here working on a KPA500 project. Sri about that.
Ron
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mike Fatchett W0MU
Sent: Saturday, December 10, 2011 8:29 PM
To: elecraft@mailman.qth.net
Subject
On 12/10/2011 6:02 PM, Jim Wiley wrote:
> I have a few Tripp-Lite
> "Isobar" outlet boxes, and if they "catch" a surge, they will make a
> VERY loud bang!
That very loud bang is almost certainly the MOV failing (and they fail
destructively).
73, Jim K9YC
___
I followed the link, Ian. I think it's amazing that an *antenna tuner*:
1. has to be plugged in to AC power to work
2. has cooling fans
3. runs the Linux operating system
I am just old enough to find that somewhere between humourous and preposterous.
Al W6LX
I think this design is summed up nicely by the term "overkill".
Matthew Pitts
N8OHU
Sent from my Wireless Device
-Original Message-
From: Al Lorona
Sender: elecraft-boun...@mailman.qth.net
Date: Sat, 10 Dec 2011 20:46:11
To:
Subject: Re: [Elecraft] Balun on tuner input?
I followed th
Hi Ron,
Bingo! This K3/100 has gold-plated pins - no corrosion but I sprayed them
with a little 'De-Oxit', re-seated the 100w module and now all is well..
I'll send the cigar by courier.
73 and thanks again,
Ken ZL1AIH
--- On Sun, 11/12/11, Ron D'Eau Claire wrote:
From: Ron D'Eau Claire
Back when they were still in beta I believe someone posted a source for
that cord with the 15amp 240 volt plug. Check " cables.com " I know they
have some 240 volt nema cables.
Jim K0XU Sent from my Xoom tablet
On Dec 10, 2011 9:37 PM, wrote:
> How do I go about changing from 120-Volt to 240-Vol
Thanks for the information. I will make sure to do a full diagnostic tomorrow
on the power supplies and strips.
Keith
Sent from my iPhone please excuse typos
On Dec 10, 2011, at 8:42 PM, "Jim Brown" wrote:
> On 12/10/2011 6:02 PM, Jim Wiley wrote:
>> I have a few Tripp-Lite
>> "Isobar" outle
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