Re: [Elecraft] Wire size for the ground on the KX2

[Jim Brown]

On Thu,6/15/2017 1:27 PM, Mike Morrell wrote:

Given the small size of the mini banana plug for KX2 ground connection, what 
size wire are folks using ; assuming ease of transport , etc.


What is the purpose of this "ground connection?" The only reason for a 
connection to mother earth is for lightning protection. For that, you 
want big wire.


Or is this a counterpoise, to make the antenna work better? Such a wire 
should NOT be connected to mother earth, and a few feet above the earth 
is a good thing. And it can be small diameter -- #18-#22 are commonly 
used for backpacking.


73, Jim K9YC

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Re: [Elecraft] Wire size for the ground on the KX2

[K9MA]

On 6/15/2017 21:59, Fred Jensen wrote:
RF current will be on the surface which scales as r-squared. 


Surface area is proportional to r, NOT r-squared.

However, the inductance is much more important than the resistance.  
Larger diameter reduces the inductance, but not very fast, and in a 
complicated way.


http://chemandy.com/calculators/round-wire-inductance-calculator.htm


Scott  K9MA

--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] Wire size for the ground on the KX2

[Fred Jensen]

Use what fits. RF current will be on the surface which scales as 
r-squared.  Obviously larger diameter make more surface area.  If you're 
in the field, use what fits/what you have.  You'll never notice the 
difference, ANY wire is better than no wire.  It's really easy to fall 
into "Picking fly poop out of the pepper," just go and enjoy your radio.


73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn

On 6/15/2017 1:27 PM, Mike Morrell wrote:

Given the small size of the mini banana plug for KX2 ground connection ,
what size wire are folks using ; assuming ease of transport , etc.

Thanks,


Mike K8KE



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Re: [Elecraft] Remote Operating Time Sync

[Clay Autery]

Interesting, but don't see a way to feed/sync time with either a
computer or the radio...

__
Clay Autery, KY5G

(318) 518-1389

On 6/15/2017 4:22 PM, Peter Pauly wrote:
> I bought this for getting the time from GPS satelites while operating
> remote...it's only about an inch wide and has a time display:
>
> https://www.tindie.com/products/PhoenixCNC/olediuno-gps-cube/
>
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Re: [Elecraft] Remote Operating Time Sync

[Clay Autery]

Personally, I think you'd be better served using Raspberry Pi approach. 
See the website I put down in my other post...  Nah, here it is
again...  Do yourself a favor and read this guy's site...

http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html

__
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On 6/15/2017 3:51 PM, James Bennett wrote:
> So, I’m thinking my best bet would be to go with some sort of GPS/NTP 
> arrangement. To that end, I’ve ordered a copy of the ARRL Arduino book one of 
> you pointed out to me.

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[Elecraft] [KPA1500] A/B antenna switch function

[inventor61 .]

When the amplifier is *off* (from the front panel power control; mains AC
on) what is the function of the A/B switch?

Steve KZ1X
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Re: [Elecraft] Remote Operating Time Sync

[Clay Autery]

Yep...  Build yourself a tiny little Stratun-1 NTP server using
Raspberry Pi and a GPS receiver...

Ideas:  http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html

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On 6/15/2017 2:12 PM, Marvin Wheeler wrote:
> Jim:
>
>  
>
> I would suggest a device that syncs with the gps system. I think it would be
> far more reliable to receive a signal than one from WWV with propagation the
> way it is.
>
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Re: [Elecraft] Remote Operating Time Sync

[M. George]

I should have mentioned that there is an obvious way to sync your clock for
JT mode operation... per the spec:

The JT65 protocol states that a transmission will begin at precisely 1
second into a new minute and end 46.811 seconds later.

So if you have no time source and if you can't hear WWV and you have no
internet... just sync up with the other signals you hear.  Get your clock
setting routine ready to roll for 1 second past the current minute and wait
for the beginning of a melee of signals / JT transmit cycle.  It might take
you a few tries, but you will be good to go.  It certainly doesn't need to
be perfect or in the millisecond time frame.  Use your ear and sync your
clock to one second past the current minute.

On another topic... for a couple years now I have hosted and run a Stratum
1 ntp time server (as many others around the globe have, this is nothing
new).  If you want to point to a dedicated stratum 1 NTP server that is GPS
synchronized (and runs in the low nano (yes it's in the low nano range)
second accuracy range), point your NTP configuration / Windows time sync
configuration to: time.nc7j.com  (via NTP over the internet, the best you
will do is usually mid micro second accuracy if you have a fairly low ping
time to the source... I'm in Syracuse Utah with my host IP out of Salt Lake
City for this ntp server)

You can see the status of my NTP server here: http://www.pool.ntp.org/
scores/time.nc7j.com

If you are in the US, you will get a much more accurate consistent sync
from time.nc7j.com than you would from other pooled sources.

Max NG7M

On Thu, Jun 15, 2017 at 12:59 PM, Matthew George  wrote:

> Tune in to wwv and synchronize your clock.  The jt modes will be fine even
> if you are a second or two off.  Or get a gps and synch to the gps clock
> via nema.  Use google and search on all your options.  You could setup nptd
> on your mac and use a pps signal from a gps too.  Max Ng7m
>
> --
> Matthew George
> 801-560-8754
>
> > On Jun 15, 2017, at 12:46 PM, James Bennett  wrote:
> >
> > I have a MacBook Pro Retina Display running Sierra 10.12.5 that I use
> with my KX3 when operating portable. Part of my operating is done with
> WSJT-X, for JT65 and JT9 modes. This software is very time sync critical -
> the computer clock needs to be within +- one second accuracy. Here at home
> on my wireless network connected to our cable company, works great.
> >
> > However, a recent trip to the southern Philippines as DU8/W6JHB with
> this equipment was an eye-opener. I completely forgot that the laptop clock
> would not keep that sort of accuracy without having Internet access. I saw
> many signals, but WSJT-X decoded nothing at first. Luckily I realized what
> was happening and was able to access and connect to the WiFi network at the
> resort we were staying at. This connection provided the accuracy the
> software needed and all was good.
> >
> > But - when we return on our next "vacation" we may not have the luxury
> of a resort having WiFi for it's guests. So, I'm looking for some sort of
> device that I can use to keep the laptop clock accurate. Internet access
> would be a bonus, but of most importance is that internal clock.
> >
> > Any suggestions? By the way, a mega-buck device is pretty much out of
> the question. Just ask my wife... :-)
> >
> > 73, Jim
> >
> > Jim Bennett / W6JHB
> > Folsom, CA
> >
> >
> >
> >
> >
> >
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>



-- 
M. George
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[Elecraft] WTB: KX2

[nz8j]

If you have one for sale please send details to include options included, 
serial number, pictures, and price shipped and insured priority mail to zip 
45324.Must accept PayPal. ThanksTimNZ8J

Sent from my Verizon, Samsung Galaxy smartphone
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Re: [Elecraft] [Kx3][Kx2] AFX MD Delay

[Chris R]

Hi Wayne.

This post got me wondering: any chance the KX3's "Pitch" AFX mode can be
implemented on the K3?

My KX3 was my daily driver for a long time, but I upgraded to a K3 last
year - dual receivers, etc., amazing rig... but I do miss that AFX "Pitch"
mode...

73 Chris
NW6V


>
> --
>
> Message: 10
> Date: Wed, 14 Jun 2017 14:43:49 -0700
> From: Wayne Burdick 
> To: Hajo Dezelski 
> Cc: Elecraft Reflector 
> Subject: Re: [Elecraft] [Kx3][Kx2] AFX MD Delay
> Message-ID: <9bfec15e-ca2d-4f5c-9e5c-953194144...@elecraft.com>
> Content-Type: text/plain; charset=utf-8
>
> Hi Hajo,
>
> ?Delay? mode uses simulated stereo. This is achieved by delaying the
> right-channel audio by a small amount with respect to the left channel.
> Your brain interprets this as stereo because, in the real world, sounds
> arrive at your ears at different times.
>
> In practice this can greatly reduce listening fatigue. Note that it works
> with dual external speakers as well.
>
> Wayne
> N6KR
>
>
>
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[Elecraft] Seeking input on KPA1500 station configurations

[Dave AD6A]

Wayne/Eric,

 

Maybe too late, I know, but I've been thinking about my ideal desk setup for
HF/6m/2m and have come up with the following list of wants for the KPA1500
system:

 

I'd like the KPA1500 power supply consumption to be less than 1W when the PA
is "off".

 

I'd like the power supply to be able to be turned "on" by a single button
push on the front panel of the amplifier (on the desk). That is, the
less-than-1W power supply, via a push-button, operates an AC contactor in
the KPA1500's power supply unit (under the desk) to turn on the main power.

 

I'd like the power supply to be able to provide an extra clean 25A (30A?) at
13.8V via several sets (4?) of 30A Anderson PowerPoles on the back panel so
that I can run my whole HF station (K3s + P3) from just the one KPA1500
power supply and I'd like to be able to turn the power for this extra power
supply on/off from a push button on the front panel of the KPA1500 (on the
desk) or simply have it turn on/off with the main AC power contactor.

 

Other wants (not KPA1500): I'd like Elecraft to make a K3s/P3 matching
stereo speaker that is 17" wide x 4" tall x 10" deep, so that it sits neatly
underneath a K3s/P3 combo. I'm actually making my own right now, but I'd
prefer an Elecraft "branded" one.

 

Thanks for listening!

 

Cheers es 73,

Dave AD6A



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Re: [Elecraft] Wire size for the ground on the KX2

[Mel Farrer via Elecraft]

The speaker wire I use is the insulated flat stuff ~16 AWG equivalent.  Rolls 
up into a nice small ball.  I put a alligator clip on one end and a ring 
terminal for the KX3.
Mel, K6KBE

  From: Michael Walker 
 To: donw...@embarqmail.com 
Cc: "Elecraft@mailman.qth.net" 
 Sent: Thursday, June 15, 2017 2:58 PM
 Subject: Re: [Elecraft] Wire size for the ground on the KX2
   
If this is for an RF ground, you'll need bigger than 22G for it to be
effective.

Braid would be preferred.

Mike va3mw


On Thu, Jun 15, 2017 at 5:25 PM, Don Wilhelm  wrote:

> Mike,
>
> I would use #22 teflon insulated wire.  Teflon because it is 'slippery'
> and that can help with wire tangles.  Thinner wire may be lighter weight if
> you are weighing fractions of ounces, but it is quite durable. Anything
> thinner becomes more fragile.  IMHO that is a reasonable compromise.
>
> 73,
> Don W3FPR
>
> On 6/15/2017 4:27 PM, Mike Morrell wrote:
>
>> Given the small size of the mini banana plug for KX2 ground connection ,
>> what size wire are folks using ; assuming ease of transport , etc.
>>
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Re: [Elecraft] Wire size for the ground on the KX2

[Michael Walker]

If this is for an RF ground, you'll need bigger than 22G for it to be
effective.

Braid would be preferred.

Mike va3mw


On Thu, Jun 15, 2017 at 5:25 PM, Don Wilhelm  wrote:

> Mike,
>
> I would use #22 teflon insulated wire.  Teflon because it is 'slippery'
> and that can help with wire tangles.  Thinner wire may be lighter weight if
> you are weighing fractions of ounces, but it is quite durable. Anything
> thinner becomes more fragile.  IMHO that is a reasonable compromise.
>
> 73,
> Don W3FPR
>
> On 6/15/2017 4:27 PM, Mike Morrell wrote:
>
>> Given the small size of the mini banana plug for KX2 ground connection ,
>> what size wire are folks using ; assuming ease of transport , etc.
>>
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[Elecraft] Seeking input on KPA1500 station configurations

[Dan Atchison via Elecraft]

Not sure if this has been suggested or not, but .  .  .  .

If you have plenty of room -- and you're not doing anything else(!), I 
think it would be interesting to have a PTT counter - a count of how 
many PTT closures during its lifetime.


73,
Dan


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Re: [Elecraft] Wire size for the ground on the KX2

[Don Wilhelm]

Mike,

I would use #22 teflon insulated wire.  Teflon because it is 'slippery' 
and that can help with wire tangles.  Thinner wire may be lighter weight 
if you are weighing fractions of ounces, but it is quite durable. 
Anything thinner becomes more fragile.  IMHO that is a reasonable 
compromise.


73,
Don W3FPR

On 6/15/2017 4:27 PM, Mike Morrell wrote:

Given the small size of the mini banana plug for KX2 ground connection ,
what size wire are folks using ; assuming ease of transport , etc.

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Re: [Elecraft] Remote Operating Time Sync

[M. George]

Jim, it's all a matter of how long the JT software on the receive side /
transmit side is written implemented.  It's simply a window where your
software is listening, there is nothing going on then then when to start
listening and when to stop listening / when to start transmitting and when
to stop transmitting.. The point I was trying to make was that in a pinch,
you should be able to use WWB and manually synch your clock within a
second.  All is not lost if you don't have a NTP implementation with
internet access.  Getting your clock with-in 1 second of WWB is not rocket
science if you can hear the signal, and there are other HF transmitted time
sources than WWB for other parts of the world.  Plus most OS
implementations of NTP will only sync your clock on a weekly basis and
depending on how bad your PC clock is in parts per million PPM, a week of
no synch could have you off by many seconds if not by a minutes.  Google
would be a good place to start if you are looking of manual ways to sync
your clock...  The Elecraft reflector is not the first place I would start,
but it is a way to generate a bunch of email messages and get a bunch of
opinions, there is no question about that. :)

The JT modes are so unbelievably slow and painful, you can multitask and
watch a baseball game at the same time you are working stations every 5
minutes (JT mode  water boarding at 5 minutes per Q in the best scenario).
You could do a SO8R setup and still have time to drink a cup a coffee while
you are keeping track of everytihng. ;)  With all time you have between TX
and RX, someone might want to look (google it up?) at the spec and see what
the published window is suppose to be.  And yes, of course if one station
is 2 seconds fast and another station is 2 seconds slow, you might have a
problem because the software on both ends misses the start or finish where
each station's clock is off in opposite directions.  I'm sure there are
whole JT mode related groups where you can spend hours and hours talking
about how accurate your clock should be.  It's a total yawner mode, but
hey, it's still fun at times.. I'll admit to that.  ;)

Max NG7M


On Thu, Jun 15, 2017 at 1:28 PM, Jim Brown 
wrote:

> On Thu,6/15/2017 11:59 AM, Matthew George wrote:
>
>>   The jt modes will be fine even if you are a second or two off.
>>
>
> Two seconds is stretching it. I've seen very strong JT65 signals that
> don't decode with a time error of 1.7 sec!
>
> 73, Jim K9YC
>
>
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-- 
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Re: [Elecraft] Remote Operating Time Sync

[Peter Pauly]

I bought this for getting the time from GPS satelites while operating
remote...it's only about an inch wide and has a time display:

https://www.tindie.com/products/PhoenixCNC/olediuno-gps-cube/

On Thu, Jun 15, 2017 at 5:14 PM, Josh  wrote:

> I just set this up at K6QXY's place and it worked great. Accuracy is much
> better than what's required for JT65. We got a GlobalSat BR-355-S4 USB GPS
> receiver ($30) and a $20 software package from visualgps.net for Windows.
> I don't know of a MacOS version, but haven't looked.
>
> I expected to have to mount the "puck" receiver outside, but it saw many
> satellites and worked fine just sitting on a table indoors.
>
> 73,
> Josh W6XU
>
> Sent from my mobile device
>
> > On Jun 15, 2017, at 1:51 PM, James Bennett  wrote:
> >
> > Folks, thanks for the ideas! Tethering to my iPhone would work IF there
> was cell service. In many parts of Mindanao where we may go, the cell
> service is either spotty or nonexistent, so I would not want to rely on
> that. Also, WWV/WWVB/WWVH reception is not guaranteed. When I was there in
> April, I heard absolutely ZERO signals on CW on any of the ham bands - very
> strange! But when I moved to the JT-x frequencies, I got signals. So, I’m
> thinking my best bet would be to go with some sort of GPS/NTP arrangement.
> To that end, I’ve ordered a copy of the ARRL Arduino book one of you
> pointed out to me. Worth a shot. I haven’t used one of the Arduino units
> yet, but my WSJT-X operating here at home in Folsom is 100% powered by a
> Raspberry Pi 3, so I am familar with using the little micro’s.
> >
> > Sounds like a fun indoor construction project for the upcoming ugly-hot
> summer months in northern CA!
> >
> > 73, Jim / W6JHB
> >
> > Jim Bennett
> > Folsom, CA
> >
> >
> >
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Re: [Elecraft] Remote Operating Time Sync

[Josh]

I just set this up at K6QXY's place and it worked great. Accuracy is much 
better than what's required for JT65. We got a GlobalSat BR-355-S4 USB GPS 
receiver ($30) and a $20 software package from visualgps.net for Windows. I 
don't know of a MacOS version, but haven't looked. 

I expected to have to mount the "puck" receiver outside, but it saw many 
satellites and worked fine just sitting on a table indoors. 

73,
Josh W6XU

Sent from my mobile device

> On Jun 15, 2017, at 1:51 PM, James Bennett  wrote:
> 
> Folks, thanks for the ideas! Tethering to my iPhone would work IF there was 
> cell service. In many parts of Mindanao where we may go, the cell service is 
> either spotty or nonexistent, so I would not want to rely on that. Also, 
> WWV/WWVB/WWVH reception is not guaranteed. When I was there in April, I heard 
> absolutely ZERO signals on CW on any of the ham bands - very strange! But 
> when I moved to the JT-x frequencies, I got signals. So, I’m thinking my best 
> bet would be to go with some sort of GPS/NTP arrangement. To that end, I’ve 
> ordered a copy of the ARRL Arduino book one of you pointed out to me. Worth a 
> shot. I haven’t used one of the Arduino units yet, but my WSJT-X operating 
> here at home in Folsom is 100% powered by a Raspberry Pi 3, so I am familar 
> with using the little micro’s. 
> 
> Sounds like a fun indoor construction project for the upcoming ugly-hot 
> summer months in northern CA!
> 
> 73, Jim / W6JHB
> 
> Jim Bennett
> Folsom, CA
> 
> 
> 
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Re: [Elecraft] Remote Operating Time Sync

[James Bennett]

Folks, thanks for the ideas! Tethering to my iPhone would work IF there was 
cell service. In many parts of Mindanao where we may go, the cell service is 
either spotty or nonexistent, so I would not want to rely on that. Also, 
WWV/WWVB/WWVH reception is not guaranteed. When I was there in April, I heard 
absolutely ZERO signals on CW on any of the ham bands - very strange! But when 
I moved to the JT-x frequencies, I got signals. So, I’m thinking my best bet 
would be to go with some sort of GPS/NTP arrangement. To that end, I’ve ordered 
a copy of the ARRL Arduino book one of you pointed out to me. Worth a shot. I 
haven’t used one of the Arduino units yet, but my WSJT-X operating here at home 
in Folsom is 100% powered by a Raspberry Pi 3, so I am familar with using the 
little micro’s. 

Sounds like a fun indoor construction project for the upcoming ugly-hot summer 
months in northern CA!

73, Jim / W6JHB

Jim Bennett
Folsom, CA



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[Elecraft] Wire size for the ground on the KX2

[Mike Morrell]

Given the small size of the mini banana plug for KX2 ground connection ,
what size wire are folks using ; assuming ease of transport , etc. 

Thanks,


Mike K8KE

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Re: [Elecraft] Remote Operating Time Sync

[Rick WA6NHC]

Makes sense.  Originally written for EME, that transit time is about 2.7 
seconds if my math is close... 2*250K miles/(186k/s)... plus some 
processing moments, a few ms for amp relays.  A larger window would be 
problematic.


Rick wa6nhc/7


On 6/15/2017 12:28 PM, Jim Brown wrote:

On Thu,6/15/2017 11:59 AM, Matthew George wrote:

  The jt modes will be fine even if you are a second or two off.


Two seconds is stretching it. I've seen very strong JT65 signals that 
don't decode with a time error of 1.7 sec!


73, Jim K9YC

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Re: [Elecraft] Remote Operating Time Sync

[Kevin - K4VD]

I have found myself in this situation. WSJT-X shows absolute time
differences between your clock and remote stations. I takes me a little
fiddling but I found I can adjust my computer clock manually to get the
WSJT-X reported time differences down to less than a second. No Internet or
external devices needed.

Not sure about Apple products. In Windows 10 you need to go to additional
date, time, & regional settings to get to where you can adjust the seconds.

I hope there's a helpful clue in this.

73,
Kev K4VD

On Thu, Jun 15, 2017 at 2:59 PM, Matthew George 
wrote:

> Tune in to wwv and synchronize your clock.  The jt modes will be fine even
> if you are a second or two off.  Or get a gps and synch to the gps clock
> via nema.  Use google and search on all your options.  You could setup nptd
> on your mac and use a pps signal from a gps too.  Max Ng7m
>
> --
> Matthew George
> 801-560-8754
>
> > On Jun 15, 2017, at 12:46 PM, James Bennett  wrote:
> >
> > I have a MacBook Pro Retina Display running Sierra 10.12.5 that I use
> with my KX3 when operating portable. Part of my operating is done with
> WSJT-X, for JT65 and JT9 modes. This software is very time sync critical -
> the computer clock needs to be within +- one second accuracy. Here at home
> on my wireless network connected to our cable company, works great.
> >
> > However, a recent trip to the southern Philippines as DU8/W6JHB with
> this equipment was an eye-opener. I completely forgot that the laptop clock
> would not keep that sort of accuracy without having Internet access. I saw
> many signals, but WSJT-X decoded nothing at first. Luckily I realized what
> was happening and was able to access and connect to the WiFi network at the
> resort we were staying at. This connection provided the accuracy the
> software needed and all was good.
> >
> > But - when we return on our next "vacation" we may not have the luxury
> of a resort having WiFi for it's guests. So, I'm looking for some sort of
> device that I can use to keep the laptop clock accurate. Internet access
> would be a bonus, but of most importance is that internal clock.
> >
> > Any suggestions? By the way, a mega-buck device is pretty much out of
> the question. Just ask my wife... :-)
> >
> > 73, Jim
> >
> > Jim Bennett / W6JHB
> > Folsom, CA
> >
> >
> >
> >
> >
> >
> > __
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Re: [Elecraft] Remote Operating Time Sync

[Jim Brown]

On Thu,6/15/2017 11:59 AM, Matthew George wrote:

  The jt modes will be fine even if you are a second or two off.


Two seconds is stretching it. I've seen very strong JT65 signals that 
don't decode with a time error of 1.7 sec!


73, Jim K9YC

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[Elecraft] Remote Operating Time Sync

[Marvin Wheeler]

Jim:

 

I would suggest a device that syncs with the gps system. I think it would be
far more reliable to receive a signal than one from WWV with propagation the
way it is.



---
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Re: [Elecraft] Remote Operating Time Sync

[Matthew George]

Tune in to wwv and synchronize your clock.  The jt modes will be fine even if 
you are a second or two off.  Or get a gps and synch to the gps clock via nema. 
 Use google and search on all your options.  You could setup nptd on your mac 
and use a pps signal from a gps too.  Max Ng7m 

--
Matthew George
801-560-8754

> On Jun 15, 2017, at 12:46 PM, James Bennett  wrote:
> 
> I have a MacBook Pro Retina Display running Sierra 10.12.5 that I use with my 
> KX3 when operating portable. Part of my operating is done with WSJT-X, for 
> JT65 and JT9 modes. This software is very time sync critical - the computer 
> clock needs to be within +- one second accuracy. Here at home on my wireless 
> network connected to our cable company, works great.
> 
> However, a recent trip to the southern Philippines as DU8/W6JHB with this 
> equipment was an eye-opener. I completely forgot that the laptop clock would 
> not keep that sort of accuracy without having Internet access. I saw many 
> signals, but WSJT-X decoded nothing at first. Luckily I realized what was 
> happening and was able to access and connect to the WiFi network at the 
> resort we were staying at. This connection provided the accuracy the software 
> needed and all was good.
> 
> But - when we return on our next "vacation" we may not have the luxury of a 
> resort having WiFi for it's guests. So, I'm looking for some sort of device 
> that I can use to keep the laptop clock accurate. Internet access would be a 
> bonus, but of most importance is that internal clock.
> 
> Any suggestions? By the way, a mega-buck device is pretty much out of the 
> question. Just ask my wife... :-)
> 
> 73, Jim
> 
> Jim Bennett / W6JHB
> Folsom, CA
> 
> 
> 
> 
> 
> 
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Re: [Elecraft] Remote Operating Time Sync

[Walter Underwood]

Can you get internet by tethering to your phone? If so, the computer should 
sync with NTP pretty quickly, then hold to within a second while you are 
operating.

You might be able to force a sync by opening the Date & Time control panel in 
System Preferences. MacOS uses NTP by default. If that doesn’t work, I’d unlock 
the panel, uncheck “Set date and time automatically”, then recheck it.

If you are of the shell persuasion, this will do the trick.

sudo ntpdate -u time.apple.com

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

> On Jun 15, 2017, at 11:46 AM, James Bennett  wrote:
> 
> I have a MacBook Pro Retina Display running Sierra 10.12.5 that I use with my 
> KX3 when operating portable. Part of my operating is done with WSJT-X, for 
> JT65 and JT9 modes. This software is very time sync critical - the computer 
> clock needs to be within +- one second accuracy. Here at home on my wireless 
> network connected to our cable company, works great.
> 
> However, a recent trip to the southern Philippines as DU8/W6JHB with this 
> equipment was an eye-opener. I completely forgot that the laptop clock would 
> not keep that sort of accuracy without having Internet access. I saw many 
> signals, but WSJT-X decoded nothing at first. Luckily I realized what was 
> happening and was able to access and connect to the WiFi network at the 
> resort we were staying at. This connection provided the accuracy the software 
> needed and all was good.
> 
> But - when we return on our next "vacation" we may not have the luxury of a 
> resort having WiFi for it's guests. So, I'm looking for some sort of device 
> that I can use to keep the laptop clock accurate. Internet access would be a 
> bonus, but of most importance is that internal clock.
> 
> Any suggestions? By the way, a mega-buck device is pretty much out of the 
> question. Just ask my wife... :-)
> 
> 73, Jim
> 
> Jim Bennett / W6JHB
> Folsom, CA
> 
> 
> 
> 
> 
> 
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[Elecraft] Remote Operating Time Sync

[James Bennett]

I have a MacBook Pro Retina Display running Sierra 10.12.5 that I use with my 
KX3 when operating portable. Part of my operating is done with WSJT-X, for JT65 
and JT9 modes. This software is very time sync critical - the computer clock 
needs to be within +- one second accuracy. Here at home on my wireless network 
connected to our cable company, works great.
 
However, a recent trip to the southern Philippines as DU8/W6JHB with this 
equipment was an eye-opener. I completely forgot that the laptop clock would 
not keep that sort of accuracy without having Internet access. I saw many 
signals, but WSJT-X decoded nothing at first. Luckily I realized what was 
happening and was able to access and connect to the WiFi network at the resort 
we were staying at. This connection provided the accuracy the software needed 
and all was good.
 
But - when we return on our next "vacation" we may not have the luxury of a 
resort having WiFi for it's guests. So, I'm looking for some sort of device 
that I can use to keep the laptop clock accurate. Internet access would be a 
bonus, but of most importance is that internal clock.
 
Any suggestions? By the way, a mega-buck device is pretty much out of the 
question. Just ask my wife... :-)

73, Jim

Jim Bennett / W6JHB
Folsom, CA






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Re: [Elecraft] A question about the KXPA100.

[Don Wilhelm]

Grady,

Is that "250mA at 30 V (max)" the listing in the rig's specifications?
If so, it says that the rig's rating for its KEYOUT (or PTT Out) is the 
maximum it can tolerate without damage.  It normally would be a closure 
to ground (either through a saturated transistor or FET or relay 
points), and source no voltage of its own.


You can easily check that by putting your DMM probe between the PTT Out 
jack and ground.  First set your DMM to read voltage and do a quick 
transmit.  If my guess is right, your DMM will read zero volts when in 
either receive or transmit - proof that the rig does not source voltage 
on its PTT Out jack.  That spec rating is only the maximum voltage and 
current that it can handle from an external device.


If all that is true, then set the DMM to read ohms, and then put it in 
transmit.  The DMM is expected to indicate very nearly zero ohms.


If those things check out as expected you are "good to go".  The KXPA100 
will source 5 volts with a current of 1mA when the KEYIN jack is 
shorted.  That does not exceed either the voltage nor the maximum 
current rating for your rig.


Nothing is needed other than the connecting cable.

73,
Don W3FPR

On 6/14/2017 8:06 PM, Grady Harper via Elecraft wrote:

I would like to drive the amp with a tx  that shows the PTT Out line to be 
250mA at 30 V (max).  Do I need to modify current and voltage from the 
transmitter to the KXPA100?
The Key In pin for the amp wants 5V at 1 mA.


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Re: [Elecraft] A question about the KXPA100.

[Jim Rhodes]

The KXPA100 has 5v on the key line and is activated by a closure to ground.
Current upon closure is only about 1ma. You seem to make it sound like your
radio has a voltage on the key out port, this would be unusual in modern
rigs. Most rigs provide a closure to ground to key the amp. It seems likely
to me that your radio is rated to handle up to 30v on the key port and a
current of up to 250ma. This would mean that the rig would have no problem
handling the 5v at 1ma from the KXPA100. However if the rig truly measures
30v (or actually any voltage) on the key port you would need some kind of
relay or other switching circuit to provide the closure to ground to key
the KXPA100.

On Wed, Jun 14, 2017 at 7:06 PM, Grady Harper via Elecraft <
elecraft@mailman.qth.net> wrote:

> I would like to drive the amp with a tx  that shows the PTT Out line to be
> 250mA at 30 V (max).  Do I need to modify current and voltage from the
> transmitter to the KXPA100?
> The Key In pin for the amp wants 5V at 1 mA.
>
> AJ4YA
> Grady
>
> Sent from my iPad
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-- 
Jim K0XU
j...@rhodesend.net
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