RE: [Elecraft] power supply for K2

[Ron D'Eau Claire]

I use the Astron 20M. It's got plenty of current capacity to power the
K2/100 to full output plus some extra for accessories without staining.

Some ops like lots of reserve current and want to be able to power other
rigs that demand more current or more than one rig at a time so they opt for
the much larger Astron 35. 

The 20 is rated at 20 amps intermittent commercial service. The K2/100
typically demands about 14 to 18 amps intermittent service (voice peaks or
key down CW at 100 watts output) 

These are linear supplies, very quiet electrically but fairly heavy due to
the large power transformer inside. Also, you don't want to put them closer
than about 18 to 24 inches to the rig. Most rigs, actually, because the
strong a-c field can induce hum in the rig. 

I run my Astron on a stool under the operating desk. That keeps it away from
the rig and saves space. 

Ron AC7AC

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John Wiener
Sent: Sunday, March 05, 2006 9:07 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] power supply for K2


What's a good power supply for the K2 /  KPA100?  I.e., 110vac to  14vdc
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Re: [Elecraft] Anderson Power Pole connectors

[Eric Swartz - WA6HHQ, Elecraft]

We also stock them directly on the Elecraft order page.
73, Eric


Phil Kane wrote:

On Sun, 5 Mar 2006 22:16:03 -0500, Brent Sutphin wrote:

  

Were is a good source for Anderson Power Pole connectors.  I have
found several places but they all seem to have a minimum order?



 Try .  DC-Power.   I've been doing business with them
 for 6 years.

 The owner, Wes Allen, is the repeater guru for the Oregon Tualatin
 Valley A.R.C., the largest club in Oregon, (I'm a board member of
 that club) and he sells in small wuantities.

 I would recommend for starters getting the bag of 10 pairs (10 red,
 10 black, 20+ contacts), and definitely the West Mountain crimper.
 It's a bit pricey, but I've used several different crimpers and this
 one is THE best.  The reliability of the connector depends wholly on
 the reliability of the crimp, so don't settle for "second-best".

 He doesn't have on-line ordering yet, but he is very responsive to
 e-mails and phone calls (see the website).  If you can't reach him,
 it means that he's off at some hamfest somewhere - he exhibits at
 most if not all major venues.

 Have fun.

--
   73 de K2ASP - Phil Kane

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RE: [Elecraft] 40 & 60 meters K2 #5266

[Don Wilhelm]

Cary,

You must get the VFO range select voltages within an acceptable range before
you will be able to hear any signals - your 7.95 volts says that the VCO
frequency is out of range (and therefore on the wrong frequency) - first
things first!!!

First make certain you have set D19 = Y in the menu, then adjust L30 to
obtain somewhere between 6 and 7 volts when tuned to 4000 kHz - with the
K60XV installed it may be closer to 7 volts when everythig is adjusted
within range.

After that, if you still have almost 8 volts when the frequency is set to
5300, you have something wrong in the VFO Range Selection area.  Check the
capacitor (C71) that you changed to be certain it is 120 pf and check the
soldering of C71, D19 and D20.  Check to be certain the orientation of D19
and D20 are correct.

I assume you had readings on R30 that were within range before adding the
K60XV - if that is true, then the problem can be found in the components
that you added to the VFO Range Selection area - C71, D19 and D20.

Once you find the problem, check the ends of each band to be certain the
voltage at R30 is within range at all band edges - if not, re-adjust L30 and
check again.

73,
Don W3FPR

> -Original Message-
>
> Tom-
>   I hate to bother you again but I've encountered another glitch.
>  After I located the problem on 40 meters with your Cheap 'N
> Dirty Signal tracing (very effective!), everything aligned
> perfectly on all bands.
>This weekend, I installed the 60 meter and 160 meter mods and
> when I powered up my K2 recognized both - that was the good news.
>  The bad news is I can hear no signals on 40 meters and only hiss
> on 60 but I am clueless as to whether there are any signals on
> that 60 meter band since its so new (all I hear is a loud hissing
> and the same on 40 meters).
>I hooked up my DMM to R30 and get a steady 7.95 volts (a bit
> above the 7.5 max in the manual but within 10%...the voltage does
> not change whether I am on 7000, 7300, 5300 or 5450it doesn't
> budge - a steady 7.95 volts
>I tried aligning L30 on transmit and can't get above .3 volts
> on the power meter (that's "point 3" volts).  Aligning L30 on
> receive is equally as disappointing - the audio his doesn't vary
> in intensity at all.
>On 160, my receive antennna (R ant) menu is on "off" so that's
> not an issue.  I hear signals on 160 and the voltages on
> alignment are 1.85 volts at 1800 Mhz and 6.85 at 2000 Mhz.  I'm
> fairly confident the 160 mod is not the problem (but next time
> I'll install one mod at a time and align before doing the next!
> But I did have to take the heat sink off to install both so it
> made sense at the time).
>I have checked J15 and I have continuity between pins 1 and 3
> (that replaced C-6 which was my original problem with being deaf
> on 40 meters).
>At this point, I'm tempted to remove the 60 meter mode and
> replace some RF Board components to put it back to the original
> state but I hate to throw in the towel so easily.
>Have you any ideas?
>73,
>Cary, K4TM  K2 #5266
>
> 
>
> From: H. Cary III
> Sent: Fri 2/17/2006 11:20 PM
> To: Tom Hammond
> Cc: [EMAIL PROTECTED]
> Subject: RE: K4TM K-2 deaf...no wonde!
>
>
> Tom-
> I just substituted a 5pF NPO from W4QE's "junk" box of parts
> and my K-2 now has ears...thanks again for all your
> help...tomorrow I'll work on the receiver alignment...even
> without it my K-2 sure does sound good!!
>Thanks again for all your help.
>73,
>"H" Cary,  K4TM
>
> 
>
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[Elecraft] power supply for K2

[John Wiener]

What's a good power supply for the K2 /  KPA100?  I.e., 110vac to  14vdc
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Re: [Elecraft] Anderson Power Pole connectors

[Phil Kane]

On Sun, 5 Mar 2006 22:16:03 -0500, Brent Sutphin wrote:

>Were is a good source for Anderson Power Pole connectors.  I have
>found several places but they all seem to have a minimum order?

 Try .  DC-Power.   I've been doing business with them
 for 6 years.

 The owner, Wes Allen, is the repeater guru for the Oregon Tualatin
 Valley A.R.C., the largest club in Oregon, (I'm a board member of
 that club) and he sells in small wuantities.

 I would recommend for starters getting the bag of 10 pairs (10 red,
 10 black, 20+ contacts), and definitely the West Mountain crimper.
 It's a bit pricey, but I've used several different crimpers and this
 one is THE best.  The reliability of the connector depends wholly on
 the reliability of the crimp, so don't settle for "second-best".

 He doesn't have on-line ordering yet, but he is very responsive to
 e-mails and phone calls (see the website).  If you can't reach him,
 it means that he's off at some hamfest somewhere - he exhibits at
 most if not all major venues.

 Have fun.

--
   73 de K2ASP - Phil Kane

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Re: [Elecraft] Xtal Socket - a bit off topic

[Ed - K9EW]

If you use an octal socket, as Don suggests, you can plug in two crystals,
and switch between them - an old boatanchor trick.

73,
ed - k9ew


On 3/5/06, Ken Kaplan <[EMAIL PROTECTED]> wrote:
>
> I'm searching for an FT-243 crystal holder,
> the type used on DX-40's, Eico 723's and a
> million other 60's transmitters.
>
> I've done a bit of searching on the internet
> but no luck.
>
> Please contact off list: [EMAIL PROTECTED]
>
> tnx & 73
> Ken WB2ART
> www.wb2art.com
> www.unpcbs.com
>
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Re: [Elecraft] 40 & 60 meters K2 #5266

[Harvey Howell]

Also Cary, don't forget to go into the menu (might be secondary menu) and 
set D19 to Y to enable 60 meter band.


Harvey
KN6VP

- Original Message - 
From: "H. Cary III" <[EMAIL PROTECTED]>

To: <[EMAIL PROTECTED]>
Cc: ; <[EMAIL PROTECTED]>
Sent: Sunday, March 05, 2006 7:32 PM
Subject: [Elecraft] 40 & 60 meters K2 #5266


Tom-
 I hate to bother you again but I've encountered another glitch.  After I 
located the problem on 40 meters with your Cheap 'N Dirty Signal tracing 
(very effective!), everything aligned perfectly on all bands.
  This weekend, I installed the 60 meter and 160 meter mods and when I 
powered up my K2 recognized both - that was the good news.  The bad news is 
I can hear no signals on 40 meters and only hiss on 60 but I am clueless as 
to whether there are any signals on that 60 meter band since its so new (all 
I hear is a loud hissing and the same on 40 meters).
  I hooked up my DMM to R30 and get a steady 7.95 volts (a bit above the 
7.5 max in the manual but within 10%...the voltage does not change whether I 
am on 7000, 7300, 5300 or 5450it doesn't budge - a steady 7.95 volts
  I tried aligning L30 on transmit and can't get above .3 volts on the 
power meter (that's "point 3" volts).  Aligning L30 on receive is equally as 
disappointing - the audio his doesn't vary in intensity at all.
  On 160, my receive antennna (R ant) menu is on "off" so that's not an 
issue.  I hear signals on 160 and the voltages on alignment are 1.85 volts 
at 1800 Mhz and 6.85 at 2000 Mhz.  I'm fairly confident the 160 mod is not 
the problem (but next time I'll install one mod at a time and align before 
doing the next!  But I did have to take the heat sink off to install both so 
it made sense at the time).
  I have checked J15 and I have continuity between pins 1 and 3 (that 
replaced C-6 which was my original problem with being deaf on 40 meters).
  At this point, I'm tempted to remove the 60 meter mode and replace some 
RF Board components to put it back to the original state but I hate to throw 
in the towel so easily.

  Have you any ideas?
  73,
  Cary, K4TM  K2 #5266



From: H. Cary III
Sent: Fri 2/17/2006 11:20 PM
To: Tom Hammond
Cc: [EMAIL PROTECTED]
Subject: RE: K4TM K-2 deaf...no wonde!


Tom-
   I just substituted a 5pF NPO from W4QE's "junk" box of parts and my K-2 
now has ears...thanks again for all your help...tomorrow I'll work on the 
receiver alignment...even without it my K-2 sure does sound good!!

  Thanks again for all your help.
  73,
  "H" Cary,  K4TM



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Re: [Elecraft] 40 & 60 meters K2 #5266

[Harvey Howell]

Cary, on 60 meters I usually pick up WWV loud at 5000 kHz in the evening.

Harvey
KN6VP

- Original Message - 
From: "H. Cary III" <[EMAIL PROTECTED]>

To: <[EMAIL PROTECTED]>
Cc: ; <[EMAIL PROTECTED]>
Sent: Sunday, March 05, 2006 7:32 PM
Subject: [Elecraft] 40 & 60 meters K2 #5266


Tom-
 I hate to bother you again but I've encountered another glitch.  After I 
located the problem on 40 meters with your Cheap 'N Dirty Signal tracing 
(very effective!), everything aligned perfectly on all bands.
  This weekend, I installed the 60 meter and 160 meter mods and when I 
powered up my K2 recognized both - that was the good news.  The bad news is 
I can hear no signals on 40 meters and only hiss on 60 but I am clueless as 
to whether there are any signals on that 60 meter band since its so new (all 
I hear is a loud hissing and the same on 40 meters).
  I hooked up my DMM to R30 and get a steady 7.95 volts (a bit above the 
7.5 max in the manual but within 10%...the voltage does not change whether I 
am on 7000, 7300, 5300 or 5450it doesn't budge - a steady 7.95 volts
  I tried aligning L30 on transmit and can't get above .3 volts on the 
power meter (that's "point 3" volts).  Aligning L30 on receive is equally as 
disappointing - the audio his doesn't vary in intensity at all.
  On 160, my receive antennna (R ant) menu is on "off" so that's not an 
issue.  I hear signals on 160 and the voltages on alignment are 1.85 volts 
at 1800 Mhz and 6.85 at 2000 Mhz.  I'm fairly confident the 160 mod is not 
the problem (but next time I'll install one mod at a time and align before 
doing the next!  But I did have to take the heat sink off to install both so 
it made sense at the time).
  I have checked J15 and I have continuity between pins 1 and 3 (that 
replaced C-6 which was my original problem with being deaf on 40 meters).
  At this point, I'm tempted to remove the 60 meter mode and replace some 
RF Board components to put it back to the original state but I hate to throw 
in the towel so easily.

  Have you any ideas?
  73,
  Cary, K4TM  K2 #5266



From: H. Cary III
Sent: Fri 2/17/2006 11:20 PM
To: Tom Hammond
Cc: [EMAIL PROTECTED]
Subject: RE: K4TM K-2 deaf...no wonde!


Tom-
   I just substituted a 5pF NPO from W4QE's "junk" box of parts and my K-2 
now has ears...thanks again for all your help...tomorrow I'll work on the 
receiver alignment...even without it my K-2 sure does sound good!!

  Thanks again for all your help.
  73,
  "H" Cary,  K4TM



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Re: [Elecraft] Anderson Power Pole connectors

[Harvey Howell]

Hi Brent. I think Tower Hobbies and Hobby People both carry them. I use them 
in my electric R/C planes. Check them out on the net.


Harvey
KN6VP

- Original Message - 
From: "Brent Sutphin" <[EMAIL PROTECTED]>

To: <[EMAIL PROTECTED]>; 
Sent: Sunday, March 05, 2006 7:16 PM
Subject: [Elecraft] Anderson Power Pole connectors


Were is a good source for Anderson Power Pole connectors.  I have found 
several places but they all seem to have a minimum order?


Thanks
Brent  WB4X
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[Elecraft] Elecraft CW Net Report for March 5th and 6th, 2005

[Kevin Rock]

Wheew!  What a lot of folks.  More than once I was met with an 
impenetrable wall of sound.  I got the first character of the quickest off 
the mark and then caught the folks who sent again.  Between the two nets 
we did pretty good.  In fact we set a new record of 38 total!  Not too bad 
considering the sun has not been too active lately.  Good thing I don't 
use those propagation prediction programs to tell me when to get on the 
air ;)


I started slowly due to splitting wood for an hour or so before the net.  
I also had three bandaids which were not helping me feel the paddles one 
bit.  When I passed the net to Tom I took them off but my thumb and 
forefinger started bleeding again.  Working outside in the cold has never 
been my hands' favorite activity.  I think they are trying to tell me 
something.  However, after dinner I felt better and they stopped bugging 
me so much.  The second net was also well attended.  QSB was present as 
well as QRM and a bit of QRN.  Nothing major.  Unfortunately we did lose 
NX8S before we could get more than a name and a state.  Michigan is in one 
of my dead zones and Tom could not hear Ted very well either.  At first I 
could copy a letter here and there but at the end I could barely tell Ted 
was there.  Sorry, maybe next week will be better.


On to the lists.

On 14050 kHz at 2257z:
N0SS - Tom - MO - K2 - 008
W1TF - Ty - GA - K1 - 1423   With a new antenna ;)  Works well Ty!
K6DGW/7 - Fred - AZ - KX1 - 897
W0CZ - Ken - ND - K2 - 1031
W0YG - Chas - CO - K2 - 5366
KL7CW - Rick - AK - KX1 - 798
K4JPN - Steve - GA - K2 - 1422
N0BK - Bruce - MN - K2 - 3646
KS4L - Randy - AL - K2 - 337
W0NTA - Dick - CO - K2 - 3900
VE1RGB - Gary - NS - K2 - 2519
WB1HGA - Ron - MA - K2 - 2135
KP4GL - Carlos - PR - K2 - 4736
K6DGW/7 - Fred - AZ - KX1 - 897
WU7R - Ci - MT - K2 - 4615 ??
AB9V - Mike - IN - K2 - 3993
N0AR - Scott - MN - K2 - 4866   QNI #5
NE5DL - Dave - TX - KX1 - 1229
KB0FB - Carl - IA - K1 - 2126
K0JEM - Joel - KS - K1 - 1400
K4TO - Dave - KY - Ten Tec
K3WW - Chas - PA - K2 - 566

On 7045 kHz at 0258z:
N0SS - Tom - MO - K2 - 008
W1TF - Ty - GA - K1 - 1423
W0CZ - Ken - ND - K2 - 1031   QNI #105!!
K4JPN - Steve - GA - K2 - 1422
KL7CW - Rick - AK - KX1 - 798
W0NTA - Dick - CO - K1 - 446
W3MC - Mike - MD - K2 - 4932
VE3XL - Ric - ON - Ten TecSpring is coming soon!   QNI #90!!
N0AR - Scott - MN - K2 - 4866
KV6K - Brian - CA - KX1 - 1270
AH6RE - Curt - HI - KX1 - 464
W1OH - Jeff - MA - KX1 - 1317
KH6NO/W7 - Willie - NV - K2 - 1593
NX8S - Ted - MI - too weak to get the info
K3OOL - Craig - PA - K2 - 4790
KL7V/5 - Sam - OK - K2 - 3158

If there are any errors or fills required please send me the data and I 
will try to get it posted.  My life is ever more hectic but I hope to find 
some time this week to get everything up to date.  Maybe when the end of 
the heating season rolls around I will get some more time.  I doubt it; I 
will most likely be working on the house, the greenhouse, and on some 
antenna projects.  A few of the locals are going to drag me out on a few 
QRP camping/hiking trips too.  Then there is Field Day and SeaPac 
Hamfest.  Though I may be able to squeeze in a few moments if I forget 
about sleeping :)


Thank you for your support.  It is most pleasureable to work so many folks 
in such a short time.  Keeps me on my toes so to speak.  Hopefully some of 
those folks we tested yesterday at the VE session will get on the air and 
work with their new code skills.  I hope they use HF early and often so 
they find out how much fun we are having.  I am sure I told them but it 
does not really sink in until you've done it yourself.

   Until next week,
  73,
 Kevin.  KD5ONS  (Net Control Operator 5th Class)
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[Elecraft] 40 & 60 meters K2 #5266

[H. Cary III]

Tom-
  I hate to bother you again but I've encountered another glitch.  After I 
located the problem on 40 meters with your Cheap 'N Dirty Signal tracing (very 
effective!), everything aligned perfectly on all bands.
   This weekend, I installed the 60 meter and 160 meter mods and when I powered 
up my K2 recognized both - that was the good news.  The bad news is I can hear 
no signals on 40 meters and only hiss on 60 but I am clueless as to whether 
there are any signals on that 60 meter band since its so new (all I hear is a 
loud hissing and the same on 40 meters).
   I hooked up my DMM to R30 and get a steady 7.95 volts (a bit above the 7.5 
max in the manual but within 10%...the voltage does not change whether I am on 
7000, 7300, 5300 or 5450it doesn't budge - a steady 7.95 volts
   I tried aligning L30 on transmit and can't get above .3 volts on the power 
meter (that's "point 3" volts).  Aligning L30 on receive is equally as 
disappointing - the audio his doesn't vary in intensity at all.
   On 160, my receive antennna (R ant) menu is on "off" so that's not an issue. 
 I hear signals on 160 and the voltages on alignment are 1.85 volts at 1800 Mhz 
and 6.85 at 2000 Mhz.  I'm fairly confident the 160 mod is not the problem (but 
next time I'll install one mod at a time and align before doing the next!  But 
I did have to take the heat sink off to install both so it made sense at the 
time).
   I have checked J15 and I have continuity between pins 1 and 3 (that replaced 
C-6 which was my original problem with being deaf on 40 meters).
   At this point, I'm tempted to remove the 60 meter mode and replace some RF 
Board components to put it back to the original state but I hate to throw in 
the towel so easily.
   Have you any ideas?
   73,
   Cary, K4TM  K2 #5266



From: H. Cary III
Sent: Fri 2/17/2006 11:20 PM
To: Tom Hammond
Cc: [EMAIL PROTECTED]
Subject: RE: K4TM K-2 deaf...no wonde!


Tom-
I just substituted a 5pF NPO from W4QE's "junk" box of parts and my K-2 now 
has ears...thanks again for all your help...tomorrow I'll work on the receiver 
alignment...even without it my K-2 sure does sound good!!
   Thanks again for all your help.
   73,
   "H" Cary,  K4TM



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RE: [Elecraft] Xtal Socket - a bit off topic

[Don Wilhelm]

Ken,

If you cannot find a real crystal socket, you could use an octal tube socket
which may be a bit easier to find.
Should you decide to go the octal socket route, I can likely dig one out of
my 'old stuff' junkbox - just send me your address.

73,
Don W3FPR

> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Ken Kaplan
> Sent: Sunday, March 05, 2006 10:12 PM
> To: Elecraft@mailman.qth.net
> Subject: [Elecraft] Xtal Socket - a bit off topic
>
>
> I'm searching for an FT-243 crystal holder,
> the type used on DX-40's, Eico 723's and a
> million other 60's transmitters.
>
> I've done a bit of searching on the internet
> but no luck.
>
> Please contact off list: [EMAIL PROTECTED]
>
> tnx & 73
> Ken WB2ART
> www.wb2art.com
> www.unpcbs.com
>
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>
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[Elecraft] Anderson Power Pole connectors

[Brent Sutphin]

Were is a good source for Anderson Power Pole connectors.  I have found several 
places but they all seem to have a minimum order?

Thanks
Brent  WB4X
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[Elecraft] Xtal Socket - a bit off topic

[Ken Kaplan]

I'm searching for an FT-243 crystal holder,
the type used on DX-40's, Eico 723's and a
million other 60's transmitters.

I've done a bit of searching on the internet
but no luck.

Please contact off list: [EMAIL PROTECTED]

tnx & 73
Ken WB2ART
www.wb2art.com
www.unpcbs.com

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RE: [Elecraft] is it dead

[Ron D'Eau Claire]

While transmitting on 40m my K2 flashed "HI CUR" popped and went dark. I
turned it off. Turned the power supply off.  Waited  a bit turned 
power supply
on then K2. Still dark
Where to look
What to look for?
RC kc5wa K2 #4948

-


Is it a K2/100? If so did you blow the 20A in-line fuse?

The Hi Cur can appear any time the SWR jumps for some reason. It happened to
me once and I discovered that I had forgotten to tighten an SO-239 connector
after doing some swapping around. 

Normally, a QRP K2 will reset itself (it uses a resettable fuse). 

Ron AC7AC

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[Elecraft] is it dead

[kc5wa]

While transmitting on 40m my K2 flashed "HI CUR" popped and went dark.
I turned it off. Turned the power supply off.  Waited  a bit turned 
power supply

on then K2. Still dark
Where to look
What to look for?
RC kc5wa K2 #4948


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RE: [Elecraft] K2 receive audio harmonic distortion

[K. Rice]

Thanks Sverre, Mike and Don.

Doh!

After cutting the PC's software gain control to near-minimum, it does
appear that most if not all of the odd-harmonic distortion was due
to overdriving the soundcard.  To make certain, I will repeat the 
experiment on a USB sound card that has bona fide line inputs and
better dynamic range, but I expect to find that the K2's audio 
is just fine.

Thanks again for putting the experiment right.

73,

Ken
K3VV
Coopersburg, PA


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[Elecraft] Re: Strange Problem

[Charlie, W0YG]

Thanks for all the guidance.  Yes, I missed that in the manual.  After 
leaving it for a while, it indeed stays on the last frequency.


Thanks again!  Normal operation.

73,

Charlie, W0YG..>>

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[Elecraft] KX1 Question

[Fred Jensen]

Managed to work N7RV in the Seattle area, so I may manage a QNI to ECN 
in about 10 mins.  I'm getting 1.7 W into a 26' wire with the steel 
fence around the pool as the ground plane.


I just noticed that everytime I turn the KX1 on, it come up on 14040.0 
regardless of where I had it before.  Is this normal?


If anyone sees this before 20M ECN, listen for a very weak one ... I'll 
wait until the big guns are taken care of.


Fred K6DGW/7
Lake Havasu City AZ

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RE: [Elecraft] Strange Problem

[Don Wilhelm]

Charlie,

Don't do that reset!!!

The K2 does that if you do not wait long enough at the new frequency.
So tune it up to 14.035 again and wait at least 30 seconds (or a full
minute) before changing bands or turning power off.

It has always been there - you just didn't notice before.

73,
Don W3FPR

> -Original Message-
>
> Well a problem just started.  Regardless of where in the 20M band
> I am when
> I shut down, it always comes up on the same frequency when I turn the rig
> back on.  The same is true of other bands.  Never happened before.  Real
> strange.
>
> An example of this is I turn the rig on and say it comes up on 14.010.  I
> tune up the band to 14.035 and turn it off.  If I turn it back on
> immediately, it come up back on 14.010!
>
> Anyone got any ideas before I do a reset, ugh!
>
> 73,
>
> Charlie, W0YG..>>
> SN 5366
>

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RE: [Elecraft] KPA100 T-R switch

[Don Wilhelm]

Gil,

The power handling capability is limited by the reverse bias voltage applied
to the switch, which is about 120 volts under load - so the power limit as
implemented in the KPA100 is only about 120 watts.

You would need a bias voltage in the neighborhood of 300 volts to handle 400
watts, and the switching MOSFETs must also be capable of handling that
voltage.

73,
Don W3FPR

> -Original Message-
>
> Anyone have an idea of just how much power the T-R sw. in the
> KPA100 would handle over the 100 watts it is handling . 300 -400 watts?
>
> ThanksGilK8EAG
>

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SV: [Elecraft] Strange Problem

[Sverre Holm]

> -Opprinnelig melding-
> 
> An example of this is I turn the rig on and say it comes up 
> on 14.010.  I tune up the band to 14.035 and turn it off.  If 
> I turn it back on immediately, it come up back on 14.010!

Did you try to wait > 30 seconds before you turn it off?

The manual says:

"Backup Timer

While you're moving the VFO, a 30-second data backup timer is
being continuously re-started. Once you have completely stopped
tuning the VFO for at least 30 seconds, the K2 will then save your
current operating frequency in EEPROM. As long as you stay on a
particular frequency, no further updates will be done."


73

Sverre
LA3ZA
http://www.qslnet.de/la3za/
 

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RE: [Elecraft] K2 receive audio harmonic distortion

[Don Wilhelm]

Ken,

I do not believe that harmonic distortion is coming from the K2 - that
pattern looks like a soundcard overdriven condition to me.

When you reduce the AF Gain at the K2, you reduce the input to the sound
card, and at some point, the soundcard no longer distorts.

Use the PC soundcard mixer controls to reduce the gain settings on your
soundcard (mic or line-in, whichever you are using, and the master volume)
to somewhere between 1/2 and 2/3 of the max settings (if you are using the
mic input, you may have to go as low as 1/4 or less), then bring up the gain
on the K2 to produce a reasonable size display,  As others have noted, -30
dB is probably as high as you can go before the soundcard distorts.

73,
Don W3FPR

> -Original Message-
>
> I have been thinking that the receive audio from my K2 (#4314) was just
> OK, especially on CW when compared to other rigs including a Drake R8
> and a K1.  It's not terrible by any means, just not as good as it might
> be.
>
> Today I fed an S9 CW signal into Spectrogram and find that its third audio
> harmonic is down approximately 10 dB from the fundamental.  The 5th,
> 7th, 9th, are down about 4 db sucessively from the next-lower odd
> harmonic.
>
>

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[Elecraft] Strange Problem

[Charlie, W0YG]

Well a problem just started.  Regardless of where in the 20M band I am when 
I shut down, it always comes up on the same frequency when I turn the rig 
back on.  The same is true of other bands.  Never happened before.  Real 
strange.


An example of this is I turn the rig on and say it comes up on 14.010.  I 
tune up the band to 14.035 and turn it off.  If I turn it back on 
immediately, it come up back on 14.010!


Anyone got any ideas before I do a reset, ugh!

73,

Charlie, W0YG..>>
SN 5366

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RE: [Elecraft] Magnetic shielding Kit for T5 (K2)

[Don Wilhelm]

Yes, you will have to lower the voltage.

It is difficult to see if you are moving the turns of T5 in the correct
direction if you observe the 7.9 volt point because that is the maximum
voltage that you are likely to see (it is almost 8 volts and the driving
opamp is being driven to the high voltage rail.

All the voltages will reduce during the process of getting the 4000kHz point
to tune with 7.5 volts or less.  Tune downward to a frequency that gives you
a voltage less than the 7.9 volts, and then manipulate the turns of T5 to
reduce that voltage by about half a volt - then recheck the voltage at 4000
kHz - repeat as required.  When you have the 4000 kHz point in range, check
all the other band edges to be certain they are also in range.

73,
Don W3FPR

> -Original Message-
>
> I have completed the second phase of assembly.  Everything has
> checked out perfect.  However, I installed the magnetic shielding
> option for T5.  All my voltage readings are right on except for one,
> the high end of 80 meters, (4000).
>
> My voltage is 7.9.  All others are 3,4 to 4.5.  they say if some of
> the voltages are less than 1 volt and or greater than 7.5, the
> windings 1/2 will need to be adjusted.  I tried that and no change on
> the 7.9. but the others shifted, still in the correct dc voltage
> range.  Do I need to be concerned with this, or is it good ??
>
> Thanks
>

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Re: [Elecraft] KPA100 T-R switch

[Don]

It is pretty marginal at 100 watts.  Calculate the *peak* voltage of a 100 
watt carrier into a 50 ohm load (about a hundred volts .. more if the load 
impedance is higher than 50 ohms) to get an idea of the voltage that the 
switch must handle.  Then look at the bias voltage for the TR switch (I 
forgot .. about 120volts or so I think).


Don K7FJ



   Anyone have an idea of just how much power the T-R sw. in the
KPA100 would handle over the 100 watts it is handling . 300 -400 watts?

   ThanksGilK8EAG






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Re: [Elecraft] K2 receive audio harmonic distortion

[Mike Harris]

G'day,

| Today I fed an S9 CW signal into Spectrogram and find that its third 
audio
| harmonic is down approximately 10 dB from the fundamental.  The 5th,
| 7th, 9th, are down about 4 db sucessively from the next-lower odd
| harmonic.

Sounds like overdriving the sound card to me.  I never run Spectrogram 
above -30dB for that reason.  Turn down the line input on the PC.

Regards,

Mike VP8NO 

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SV: [Elecraft] K2 receive audio harmonic distortion

[Sverre Holm]

> -Opprinnelig melding-
> 
> Today I fed an S9 CW signal into Spectrogram and find that 
> its third audio harmonic is down approximately 10 dB from the 
> fundamental.  The 5th, 7th, 9th, are down about 4 db 
> sucessively from the next-lower odd harmonic.

Just a few questions to understand your measurement: How did you feed the
signal into your PC for analysis, using a microphone or from e.g. the
headphone output?

In my experience, it is very easy to overload the sound card in the PC. The
result is the same kind of distortion that your plot shows. A simple check
is to try to adjust the PC input level (software controlled slider) and see
if that changes the distortion.


73

Sverre
LA3ZA
http://www.qslnet.de/la3za/
 

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[Elecraft] Magnetic shielding Kit for T5 (K2)

[Michael Pisani]

I have completed the second phase of assembly.  Everything has  
checked out perfect.  However, I installed the magnetic shielding  
option for T5.  All my voltage readings are right on except for one,  
the high end of 80 meters, (4000).


My voltage is 7.9.  All others are 3,4 to 4.5.  they say if some of  
the voltages are less than 1 volt and or greater than 7.5, the  
windings 1/2 will need to be adjusted.  I tried that and no change on  
the 7.9. but the others shifted, still in the correct dc voltage  
range.  Do I need to be concerned with this, or is it good ??


Thanks
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[Elecraft] WTB MH2

[Brent Sutphin]

Anyone have a MH2 microphone to sale?  

Thanks
Brent WB4X
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[Elecraft] K2 receive audio harmonic distortion

[K. Rice]

I have been thinking that the receive audio from my K2 (#4314) was just
OK, especially on CW when compared to other rigs including a Drake R8
and a K1.  It's not terrible by any means, just not as good as it might
be.

Today I fed an S9 CW signal into Spectrogram and find that its third audio
harmonic is down approximately 10 dB from the fundamental.  The 5th,
7th, 9th, are down about 4 db sucessively from the next-lower odd
harmonic.

This is easier to see than to say:

   http://world.std.com/~rice/k2_harmonic_distortion_05.jpg

This is observed when driving headphones or speaker to a comfortable
listening level (red trace on the spectrogram above).  Decreasing
the RF or AF gain so that the audio level decreases ~30 dB (blue trace on
the spectrogram) eliminates the problem, but the signal is then too
faint to copy effectively.

The vertical red line is the center frquency of the widest CW filter
(1.2 kHz) set per N0SS's instructions.

AGC on/off and DSP on/off make no difference. It seems to be pretty
far downstream in the audio chain. 

Sidetone audio behaves the same - no worse.

Is this level of harmonic distortion normal?  If not, what should I 
look for to correct it?

Thanks and 73,

Ken Rice
K3VV
Coopersburg, PA


 
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[Elecraft] Re: XG2 harmonics & levels

[George M. Badger, III]

A while ago someone asked a question about the above. I didn't see a 
reply so I just built a XG2 and checked it with a HP 8562A spectrum 
analyzer, the DUT connected directly into the SA without any cable. I 
repeated the measurements three times over the course of 1 hour. They 
didn't change


Frequencies in MHz and the Po in dBm.

80M - 03.579 = 03.57910 @ -75.00 & -106.3
40M - 07.040 = 07.04015 @ -73.67 & -106.0
20M - 14.060 = 14.05982 @ -73.50 & -105 8
3 X 40M = 21.12052 @ -85.33
4 X 40M = 28.16077 @ -93.67
2 X 20M = 28.11962 @ 81.50

-107dBm = 1µv & -73dBm = 50µv
for those in that world, but you knew that.
--
   .--.
  /  Catch you on  \
 /  the flip side. /
 \  _.'
_ |/
   oo\'
  (__)\   _
\  \.'  `.
 \  \  /  \
  \  '"\
   .   (  ) \
'-| )--| :.  \
  | |  | | \  '.
 c__; c__;  '-..'>.__
   GEO de Soquel
George M. Badger III/W3AB  [EMAIL PROTECTED]http://www.w3ab.org
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[Elecraft] Fw: K2, MD-2 MIC AND MFJ-434 VOICE KEYER

[Andrew Catanzaro]

- Original Message - 
From: Andrew Catanzaro

To: [EMAIL PROTECTED]
Cc: Elecraft@mailman.qth.net
Sent: Sunday, March 05, 2006 12:03 PM
Subject: K2, MD-2 MIC AND MFJ-434 VOICE KEYER


Since my "big rig" is a Japan Radio JST-245 and it has a Yaesu microphone 
pinout,
I set the jumpers in the K2 for a Yaesu mike.  My Heil Goldline works fine 
with the
K2 and puts out excellent fidelity.  When I started using the Elecraft MH-2 
and

Heil boom mikes for the K2, I wired those also for Yaesu and there was no
problem.  The Goldline's HC-5 element had greater fidelity and definition 
than
the latter two mikes, but they had greater output and drove the K2 to full 
output.

Adding the MFJ 434 keyer was no problem.  I set the jumpers for Yaesu and
it took right off.  It's audio fidelity is a reflection of the audio you 
feed it with,
and its utility is great.  You need to be careful about setting the record 
gain,

as it easy to pick up background noise if it's set too high.

BTW, when wiring up the K2 for electret mikes, put the 5.7k dropping 
resistor in

the microphone *plug* and not in the K2.  That way you can switch between
dynamic and electret mikes and never worry about a DC volatege appearing 
across

a dynamic element.

Another note, in response to the recent posts aobut the K2 not being a good
SSB rig on transmit, I have received many unsolicited reports of good audio
with all three of the above mikes.  That was with a 2 KHz audio bandwidth.
The K2 was designed for communications power not for high fidelity
entertainement.  Most of the audio reports have come from DX stations.
I have more recently opened up the bandwidth to 2.2 kHz and, obviously,
the good audio reports continue to come in.  For those who want to
sound like the nighttime announcers on broacast AM stations, buy
the Japanese radios with the wide bandwidth and parametric equalizers,
but I think that's a different hobby from the one I participate in.
The guys from Peter I didn't seem to mind my SSB audio on the
three different bands I contacted them on, and after only a couple calls
each.  That's communicating!

73,
Andy W9NJY
Milwaukee WI
K2 2561  KX1 1139

Message: 4
Date: Sat, 04 Mar 2006 14:59:46 -
From: "Chris Page" <[EMAIL PROTECTED]>
Subject: [Elecraft] K2, MD-2  MIC AND MFJ-434 VOICE KEYER
To: elecraft@mailman.qth.net
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=US-ASCII

Is anybody using the K2 with the MD-2 mic and the MFJ-434 Voice
Keyer, please?

I borrowed an MFJ-434 Voice Keyer for the weekend to help my wife
June (M0BUE) play in the ARRL DX SSB Contest as W4/M0BUE, but cannot
get it to work with the K2 and MD-2.  I have tried changing the
various jumpers inside the keyer but that doesn't seem make any
difference.

Does anybody know which of the three options (Yaesu, Kenwood or Icom)
of the voice keyer I should use with the K2?

Could the problem be anything to do with the way the MD-2 mic plug is
wired, perhaps not being compatible with the mic socket on the keyer?

Any help and suggestions will be appreciated by June.

Thanks and 73 de Chris, G4BUE (currently N4CJ in Florida) 



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Re: [Elecraft] K0BRA Active Antennas AMRAD

[Don]

Why not be interested?  It is an interesting project.

I built the active antenna two years ago, not for use with VLF  but as an 
antenna to use with old broadcast AM radio receivers.  I had found that my 
old Philco, which was designed to use a random wire antenna, picked up more 
hum than than anything else and I needed to place an effective antenna well 
above the electric fields existing in my living room and then bring the 
signal down to the  radio through coax where I could then use a conventional 
step up transformer to match the antenna input of the receiver.  There are 
probably easier ways to make the old Philco perform but I was interested in 
the concept of using a short whip, remote amplifier, and coax to suck 
signals out of the air.   Anyway, it  worked well.  I found that it was 
effective up to about 7 MHz although performance fell off gradually about 4 
MHz.


The special power transformer (wound with very low capacitance between 
primary and secondary) may be a cost issue.  I made my own by stripping the 
secondary off a cheap RS transformer and adding a new secondary with a *lot* 
of insulation between the two windings to reduce the capacitance to very 
near that reported in the qst article for the purchased version of the 
transformer.


Don  K7FJ



Well after all of the variations of URLs and browsers, I finally clicked 
on the Active LF Antenna article and was told "You are forbidden access to 
this pageI guess I'm not interested after all :-( K4TO


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[Elecraft] KPA100 T-R switch

[Gilbert J Cross]

Anyone have an idea of just how much power the T-R sw. in the
KPA100 would handle over the 100 watts it is handling . 300 -400 watts?

ThanksGilK8EAG
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[Elecraft] Re: I/O Port issue?

[Don Clark]

Rich and Jim have provided me a couple of things to test.  I have to leave 
on a trip, but will resume the troubleshooting next Saturday.


Thanks to all for the support thus far.

don
- Original Message - 
From: "Jim Harris" <[EMAIL PROTECTED]>

To: <[EMAIL PROTECTED]>; "Elecraft" 
Sent: Sunday, March 05, 2006 12:01 PM
Subject: I/O Port issue?



Hi,

I have a similiar problem when switching between an
IC-746PRO and K2.  What I've found is I have to shut
down HRD when switching and restart it.  When it
starts chose the radio you want to use it with.  I'v
not been able to just switch radios at will.

Jim, AB0UK
K2 S/N 4787

<>

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[Elecraft] I/O Port issue?

[Jim Harris]

Hi,

I have a similiar problem when switching between an
IC-746PRO and K2.  What I've found is I have to shut
down HRD when switching and restart it.  When it
starts chose the radio you want to use it with.  I'v
not been able to just switch radios at will.

Jim, AB0UK
K2 S/N 4787

<>

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[Elecraft] More on my I/O issue

[Don Clark]

I get my side tone via pin 4 of U8.

Don
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[Elecraft] PWRgate

[walter renner]

Steve, I have been using the PWRgate for more the a year now,  to trickle 
charge a 43AH gel cell, and it works fine. the 0.3V drop has little affect 
on the K2/100.
73, Kurt K0AR0 
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RE: [Elecraft] AMRAD LF Antenna

[Jim Sheldon]

On that page that Bekir Kemal lists also is a link to the ARRL's PDF file of
the original construction article.  It's accessable and can be saved to your
hard drive.  URL for the QST article is:
http://www.arrl.org/tis/info/pdf/0109031.pdf

Jim - W0EB
Wichita, KS
K2#4338 KX1 #1268

> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of Bekir 
> Kemal Ataman
> Sent: Sunday, March 05, 2006 5:21 AM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] AMRAD LF Antenna
> 
> 
> The link on the page is incomplete and that is the reason why 
> you get a message saying you have not got the permission to 
> access that URL (the server thinks you are trying to access 
> the directory). I tried the address by adding default.htm, 
> default.html, index.htm and index.html after the slash and 
> one of them did work. The description of the antenna is at:
> 
> https://www.amrad.org/projects/lf/actant/index.htm
> 
> Good luck building it.
> 
> Greetings from Istanbul, Turkey
> BKA (TA2RX)
> 
> 
> --
> Bekir Kemal Ataman
> ArchiMac BBS Sysop & Webmaster 
> 
> 
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> Elecraft web page: http://www.elecraft.com
> 

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[Elecraft] K1 AGC

[Curron HILL]

Are there any mods to help the K1's AGC?  If I'm working a weak signal and a 
strong signal tries a contact it almost blows my eardrums with so much volume.  
Any ideas?  Do others have this problem with the K1?

73 Don KB3DRW
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[Elecraft] Qso party rules?

[Rolf Moberg]

Hello!

A couple of questions regarding to next weekend Elecraft qso party.

Scoring:

An imaginary qso between OH6KXL and N3DRK would give 5 points? Right?
or
Would it be total of 9 points (5 for s/n and 4 for different continent)

And multipliers:
rules say:
"S/P/C total for all bands and modes."

Does it mean when working OH6KXL-N3DRK in 40m cw and ssb and 20 cw and 
ssb I could achieve total of 4 multipliers?


Rolf
oh6kxl
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[Elecraft] AMRAD LF Antenna

[Bekir Kemal Ataman]

The link on the page is incomplete and that is the reason why you get a
message saying you have not got the permission to access that URL (the
server thinks you are trying to access the directory). I tried the address
by adding default.htm, default.html, index.htm and index.html after the
slash and one of them did work. The description of the antenna is at:

https://www.amrad.org/projects/lf/actant/index.htm

Good luck building it.

Greetings from Istanbul, Turkey
BKA (TA2RX)


--
Bekir Kemal Ataman
ArchiMac BBS Sysop & Webmaster 


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Re: [Elecraft] Coax Switch between two rigs

[Chuck Guenther]

Scott, K3YT, wrote: "I think my K2 is an excellent rig and will not risk it by 
hooking it  up
to a coax switch with another rig."

Point well taken, Scott.  Certainly the discussion here has raised my awareness 
of the issue of switch isolation, and I'll do something different (other than 
relying on a single MFJ switch) to protect my radios.

73,
Chuck NI0C

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