Re: [Elecraft] Extra Protection For KPA500?

[Tony]

All:

Ordered the AUX cable to connect the KPA500 to the K3S. Not having to 
worry about the drive power is well worth the cost of the cable.


Thanks to all.

Tony

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Re: [Elecraft] K4 news?

[Gary Smith]

Eric,

You weren't replying to me, but as someone 
who has already spotted for the K4D a good 
while ago; my thoughts are to take your 
time. If parts aren't available, they will 
be. If the parts are not available because 
of a pandemic, they will be as soon as is 
realistic. It just takes patience when 
dealing with things nobody has an answer 
to or a timetable impossible to offer 
because of that.

I'm looking forward to the K4D when you're 
able, good, & ready to release it. I 
suspect we all feel that way.

73,

Gary
KA1J


> Hi Irwin,
> 
> We are also concerned about the impact of the COVID-19 virus on the
> shipping and supply chains we use for parts used in all of our
> products, including the K4. While managing the supply chain and
> quickly finding alternate parts when they go obsolete or when
> shortages pop up has been a normal part of our production planning
> process for years, it has certainly become more challenging as this
> situation quickly evolves.
> 
> We've been tracking and compensating for this on the K4 for some time.
> While we manufacture our radios, amps etc. here in California, the
> electronic components used by us and almost all other U.S.
> manufacturers come from both the U.S. and from suppliers all around
> the world. (Many are not even manufactured in the U.S.) We've been
> careful to source many of the major K4 items, like the flat screen
> display used in the K4, from other countries than China.  The biggest
> area of concern recently has been with the passive components
> (resistors, caps etc) used on all of our designs. Even when purchased
> from U.S. suppliers, many of these parts may come from China and other
> offshore sources.
> 
> We also have built up inventory on many critical K4 parts here
> (including Knobs etc.) but of course, as noted by others, it only
> takes a single critical part delay in the future to hold things up. 
> We plan with alternate suppliers when possible, but even then we have
> to periodically scramble to source new parts for production. Fun, eh?
> 
> In any case, so far we have not encountered any major show stoppers,
> though even prior to the current COVID scare began seeing delivery
> delays increasing. We'll have a much better picture on how this will
> impact the K4 as major component deliveries arrive at the factory over
> the coming weeks. Fortunately, we are busy both getting all aspects of
> production started and we are also working in engineering every day to
> add cool new features to the K4. Not much time to sleep at Elecraft
> these days.
> 
> Time for more coffee..
> 
> 73,
> Eric
> *elecraft.com *
> 
> 
> On Thu, Mar 5, 2020 at 5:14 AM Irwin Darack  wrote:
> 
> > I am curious to know if the reduction in manufacturing in China, do
> > to the COVID-19 virus, is having an affect on the ability of
> > Elecraft to obtain parts? The area of China that is the epicenter is
> > a major manufacturer of electronic components.
> >
> > Irwin KD3TB
> >
> >
> >
> > On Wed, Mar 4, 2020 at 6:11 PM Rick Miller - N1RM 
> > wrote:
> >
> > > Very clever post.
> > >
> > > When they announced the last delay, there was a statement that
> > > there
> > would
> > > be more frequent updates.  Perhaps, if nothing else, this thread
> > > will provide motivation for another update.  Since many of us are
> > > "investors"
> > in
> > > the K4, it seems reasonable to ask.
> > >
> > > 73 and hope your twitter remains under control!
> > > Rick
> > > N1RM
> > >
> > >
> > >
> > > --
> > > Sent from: http://elecraft.365791.n2.nabble.com/
> > > __
> > > Elecraft mailing list Home:
> > > http://mailman.qth.net/mailman/listinfo/elecraft Help:
> > > http://mailman.qth.net/mmfaq.htm Post:
> > > mailto:Elecraft@mailman.qth.net
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list:
> > > http://www.qsl.net/donate.html Message delivered to
> > > idar...@gmail.com
> > >
> > --
> > Irwin KD3TB
> > __
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> >
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Re: [Elecraft] Extra Protection For KPA500?

[Jim Brown]

On 3/6/2020 11:35 AM, Jack Brindle via Elecraft wrote:

The key here is the need for the AuxIO cable. The K3 exposes the second set of 
per-band power settings when it knows the KPA is attached and is in OPER mode.


That's a neat feature, but since Elecraft frequency sensing and 
band-switching in their tuners and amps is so fast, I've never used an 
aux cable for my KAT500, KPA500 or KPA1500.


73, Jim K9YC
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Re: [Elecraft] Extra Protection For KPA500?

[Rick Bates, NK7I]

On 3/6/2020 12:00 PM, Bob McGraw K4TAX wrote:
It is more like having a 500 watt transceiver that covers 160M - 6M 
and works any mode I desire.   Now, that ain't bad!



Just WAIT until you get the KPA1500, then you'll have to ask "CAN that 
smile get ANY bigger?"  0.1-1500 watt radio, you decide just how much to 
use, it just keeps playing.


Rick NK7I


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Re: [Elecraft] Extra Protection For KPA500?

[Rick Bates, NK7I]

While you're adjusting the output drive for the amp on each band; make 
sure it's EACH band, including 60M (100 watt limit in the US) and 30M 
(200 watt limit in the US).


Yes, those bands also, because operator error (fatigue, excitement, 
rush, brain slip) WILL happen and having those QRP bands preset in the 
amp could save you grief.


Hope for the best, plan for the worst; this is planning for the worst, 
stuff happens.


73,
Rick NK7I


On 3/6/2020 11:37 AM, Bob McGraw K4TAX wrote:

Tony et al:

Go to the K3S  CONFIG menu and PWR SET.  Set the value to PER BAND.  
Then exit this menu by pressing MENU/CONFIG.  There IS NO value to set 
at this point.   Then with the KPA500 on and in OPER mode, while in 
RX, set the PWR value on the K3S to 20 watts or what ever power you 
wish to drive the amp with for that band. That is saved for that mode 
and band.   Then on to the next band.


When the KPA500 is in STBY mode the power value is what is set on the 
K3S for barefoot operation.  When the KPA500 is switched to OPER then 
the power value is what you have set for that mode and band.   This 
does require the KPA500 to communicate with the AUX cable.   See page 
12 Fig 3 of the KPA500 manual for the configuration.


If you have the K3S, the KPA500 and the KAT500, then see page 5of the 
KAT500 manual, Fig 1 for the correct cables and configuration.


As they say, it is all in the manuals.

73

Bob, K4TAX


On 3/6/2020 1:07 PM, Tony wrote:


Tony, The Config Menu has a Per-Band power setting (PWR SET = PEr 
bAnd) that will set the power output depending on the band selected. 
If you use the Aux cable between the K3 and KPA500 is is fully 
automatic and seamless. 73 George AI4VZ 


George:

I must be missing something because when I select PER BAND in the 
config menu, there's no power setting to set.


It doesn't display the power like TUN PWR does where the tune power 
is shown within that menu item so you can adjust it.


I have to order the AUX cable, but in the meantime I'd like to use 
this setting with the K3S so any suggestions would be appreciated.


Tony


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Re: [Elecraft] FS: KPAKAUX cable set

[Don Wilhelm]

The AUX Cable uses the ACC connector, not the serial port or the USB 
port.  Are you certain you are  offering the AUX cable that fits into 
the 15 pin connectors?  So it can be used with the older K3 with the 
RS232 port or the newer KIO3B with the USB connector.


73,
Don W3FPR

On 3/6/2020 4:51 PM, Mike Maloney wrote:

New unused AUX Cable set Optional KPA500 or KPA1500 to K3S/K3.  Wont play with 
my older K3 version with serial port.   Asking $30 shipped CONUS only.
Mike AC5P

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[Elecraft] FS: KPAKAUX cable set

[Mike Maloney]

New unused AUX Cable set Optional KPA500 or KPA1500 to K3S/K3.  Wont play with 
my older K3 version with serial port.   Asking $30 shipped CONUS only.   
Mike AC5P
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Re: [Elecraft] Extra Protection For KPA500?

[Jack Brindle via Elecraft]

One other thing to consider is that you don’t want to connect all of the pins 
straight through from the K3 to the KPA500. There are some conflicts that will 
cause problems. The Elecraft cables are set up properly with the appropriate 
pins cut that should not connect between the two devices. An alternative is to 
use a straight-through HD15-HD15 cable with the appropriate pins cut. Cutting 
them yourself is a pain, so we really don’t recommend that route.

73!
Jack, W6FB

> On Mar 6, 2020, at 12:19 PM, Bob McGraw K4TAX  wrote:
> 
> Just order the two cables from Elecraft as it is a special wired and 
> configured cable.   E85046   I doubt seriously if an aftermarket cable would 
> work.
> 
> The manual clearly states  "do not use a standard VGA cable!"
> 
> The KAT500 manual, page 5, Fig. 1 is the correct configuration for your 
> application.  It requires 2 of the E85046 cables.  This is not the time to be 
> conservative or cut cost corners.  You have ~$8500 in radios depending on 
> this.
> 
> 73
> 
> Bob, K4TAX
> 
> 
> On 3/6/2020 2:06 PM, Tony wrote:
>> Bob:
>> 
>> The AUX cable requirement makes sense. Can you recommend an aftermarket 
>> cable? I’ll need one for the KPA500 and another for the KAT500.
>> 
>> Thanks
>> 
>> Tony
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> Sent from my iPad
>> 
>>> On Mar 6, 2020, at 2:38 PM, Bob McGraw K4TAX  wrote:
>>> 
>>> Tony et al:
>>> 
>>> Go to the K3S  CONFIG menu and PWR SET.  Set the value to PER BAND.  Then 
>>> exit this menu by pressing MENU/CONFIG.  There IS NO value to set at this 
>>> point.   Then with the KPA500 on and in OPER mode, while in RX, set the PWR 
>>> value on the K3S to 20 watts or what ever power you wish to drive the amp 
>>> with for that band. That is saved for that mode and band.   Then on to the 
>>> next band.
>>> 
>>> When the KPA500 is in STBY mode the power value is what is set on the K3S 
>>> for barefoot operation.  When the KPA500 is switched to OPER then the power 
>>> value is what you have set for that mode and band.   This does require the 
>>> KPA500 to communicate with the AUX cable.   See page 12 Fig 3 of the KPA500 
>>> manual for the configuration.
>>> 
>>> If you have the K3S, the KPA500 and the KAT500, then see page 5of the 
>>> KAT500 manual, Fig 1 for the correct cables and configuration.
>>> 
>>> As they say, it is all in the manuals.
>>> 
>>> 73
>>> 
>>> Bob, K4TAX
>>> 
>>> 
 On 3/6/2020 1:07 PM, Tony wrote:
 
> Tony, The Config Menu has a Per-Band power setting (PWR SET = PEr bAnd) 
> that will set the power output depending on the band selected. If you use 
> the Aux cable between the K3 and KPA500 is is fully automatic and 
> seamless. 73 George AI4VZ
 George:
 
 I must be missing something because when I select PER BAND in the config 
 menu, there's no power setting to set.
 
 It doesn't display the power like TUN PWR does where the tune power is 
 shown within that menu item so you can adjust it.
 
 I have to order the AUX cable, but in the meantime I'd like to use this 
 setting with the K3S so any suggestions would be appreciated.
 
 Tony
 
 
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[Elecraft] looking for a K3 or KX3

[Terry E]

hi looking for a k3 or kx3 wo power supply and 100 w amp Thx Terry



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Re: [Elecraft] Extra Protection For KPA500?

[Bob McGraw K4TAX]

Just order the two cables from Elecraft as it is a special wired and 
configured cable.   E85046   I doubt seriously if an aftermarket cable 
would work.


The manual clearly states  "do not use a standard VGA cable!"

The KAT500 manual, page 5, Fig. 1 is the correct configuration for your 
application.  It requires 2 of the E85046 cables.  This is not the time 
to be conservative or cut cost corners.  You have ~$8500 in radios 
depending on this.


73

Bob, K4TAX


On 3/6/2020 2:06 PM, Tony wrote:

Bob:

The AUX cable requirement makes sense. Can you recommend an aftermarket cable? 
I’ll need one for the KPA500 and another for the KAT500.

Thanks

Tony







Sent from my iPad


On Mar 6, 2020, at 2:38 PM, Bob McGraw K4TAX  wrote:

Tony et al:

Go to the K3S  CONFIG menu and PWR SET.  Set the value to PER BAND.  Then exit 
this menu by pressing MENU/CONFIG.  There IS NO value to set at this point.   
Then with the KPA500 on and in OPER mode, while in RX, set the PWR value on the 
K3S to 20 watts or what ever power you wish to drive the amp with for that 
band. That is saved for that mode and band.   Then on to the next band.

When the KPA500 is in STBY mode the power value is what is set on the K3S for 
barefoot operation.  When the KPA500 is switched to OPER then the power value 
is what you have set for that mode and band.   This does require the KPA500 to 
communicate with the AUX cable.   See page 12 Fig 3 of the KPA500 manual for 
the configuration.

If you have the K3S, the KPA500 and the KAT500, then see page 5of the KAT500 
manual, Fig 1 for the correct cables and configuration.

As they say, it is all in the manuals.

73

Bob, K4TAX



On 3/6/2020 1:07 PM, Tony wrote:


Tony, The Config Menu has a Per-Band power setting (PWR SET = PEr bAnd) that 
will set the power output depending on the band selected. If you use the Aux 
cable between the K3 and KPA500 is is fully automatic and seamless. 73 George 
AI4VZ

George:

I must be missing something because when I select PER BAND in the config menu, 
there's no power setting to set.

It doesn't display the power like TUN PWR does where the tune power is shown 
within that menu item so you can adjust it.

I have to order the AUX cable, but in the meantime I'd like to use this setting 
with the K3S so any suggestions would be appreciated.

Tony


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Re: [Elecraft] Extra Protection For KPA500?

[Tony]

Bob:

The AUX cable requirement makes sense. Can you recommend an aftermarket cable? 
I’ll need one for the KPA500 and another for the KAT500.

Thanks

Tony







Sent from my iPad

> On Mar 6, 2020, at 2:38 PM, Bob McGraw K4TAX  wrote:
> 
> Tony et al:
> 
> Go to the K3S  CONFIG menu and PWR SET.  Set the value to PER BAND.  Then 
> exit this menu by pressing MENU/CONFIG.  There IS NO value to set at this 
> point.   Then with the KPA500 on and in OPER mode, while in RX, set the PWR 
> value on the K3S to 20 watts or what ever power you wish to drive the amp 
> with for that band. That is saved for that mode and band.   Then on to the 
> next band.
> 
> When the KPA500 is in STBY mode the power value is what is set on the K3S for 
> barefoot operation.  When the KPA500 is switched to OPER then the power value 
> is what you have set for that mode and band.   This does require the KPA500 
> to communicate with the AUX cable.   See page 12 Fig 3 of the KPA500 manual 
> for the configuration.
> 
> If you have the K3S, the KPA500 and the KAT500, then see page 5of the KAT500 
> manual, Fig 1 for the correct cables and configuration.
> 
> As they say, it is all in the manuals.
> 
> 73
> 
> Bob, K4TAX
> 
> 
>> On 3/6/2020 1:07 PM, Tony wrote:
>> 
>>> Tony, The Config Menu has a Per-Band power setting (PWR SET = PEr bAnd) 
>>> that will set the power output depending on the band selected. If you use 
>>> the Aux cable between the K3 and KPA500 is is fully automatic and seamless. 
>>> 73 George AI4VZ 
>> 
>> George:
>> 
>> I must be missing something because when I select PER BAND in the config 
>> menu, there's no power setting to set.
>> 
>> It doesn't display the power like TUN PWR does where the tune power is shown 
>> within that menu item so you can adjust it.
>> 
>> I have to order the AUX cable, but in the meantime I'd like to use this 
>> setting with the K3S so any suggestions would be appreciated.
>> 
>> Tony
>> 
>> 
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Re: [Elecraft] Extra Protection For KPA500?

[Bob McGraw K4TAX]

With this regard, Jack Brindle is absolutely correct.  The system as 
designed is more than adequate to safely and correctly interface the K3S 
to the KPA500 and then to the KAT500.  If the operator chooses not to 
use the system, as designed and intended, I view they they become a very 
underpaid design engineer with unknown project outcome.  Using another 
computer/micro-controller only adds an additional element for failure.  
There is no way to make the system idiot proof except to remove the 
idiot from the equation.


Just use the cables as required and detailed in the manuals {which one 
must have and read} and then follow the instructions in the manuals.   
Don't give me the crap "well it doesn't operate like bla bla bla".  That 
is correct, it shouldn't and it doesn't.    It is an Elecraft and the 
manual explains how it is to be utilized, and the methods do work.   I 
sit here daily in front of my K3S, KPA500, KAT500 and P3 with joy and a 
smile on my face realizing how efficient the system integration works.  
It is more like having a 500 watt transceiver that covers 160M - 6M and 
works any mode I desire.   Now, that ain't bad!


73

Bob, K4TAX



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Re: [Elecraft] Extra Protection For KPA500?

[Bob McGraw K4TAX]

Tony et al:

Go to the K3S  CONFIG menu and PWR SET.  Set the value to PER BAND.  
Then exit this menu by pressing MENU/CONFIG.  There IS NO value to set 
at this point.   Then with the KPA500 on and in OPER mode, while in RX, 
set the PWR value on the K3S to 20 watts or what ever power you wish to 
drive the amp with for that band. That is saved for that mode and 
band.   Then on to the next band.


When the KPA500 is in STBY mode the power value is what is set on the 
K3S for barefoot operation.  When the KPA500 is switched to OPER then 
the power value is what you have set for that mode and band.   This does 
require the KPA500 to communicate with the AUX cable.   See page 12 Fig 
3 of the KPA500 manual for the configuration.


If you have the K3S, the KPA500 and the KAT500, then see page 5of the 
KAT500 manual, Fig 1 for the correct cables and configuration.


As they say, it is all in the manuals.

73

Bob, K4TAX


On 3/6/2020 1:07 PM, Tony wrote:


Tony, The Config Menu has a Per-Band power setting (PWR SET = PEr 
bAnd) that will set the power output depending on the band selected. 
If you use the Aux cable between the K3 and KPA500 is is fully 
automatic and seamless. 73 George AI4VZ 


George:

I must be missing something because when I select PER BAND in the 
config menu, there's no power setting to set.


It doesn't display the power like TUN PWR does where the tune power is 
shown within that menu item so you can adjust it.


I have to order the AUX cable, but in the meantime I'd like to use 
this setting with the K3S so any suggestions would be appreciated.


Tony


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Re: [Elecraft] Extra Protection For KPA500?

[Jack Brindle via Elecraft]

The key here is the need for the AuxIO cable. The K3 exposes the second set of 
per-band power settings when it knows the KPA is attached and is in OPER mode. 
Of course to be able to communicate the AuxIO cable needs to connect the KPA to 
the K3, and the K3 needs to be set with RADIO = K3.

Once all the conditions are set, tap the OPER button on the KPA to put it in 
OPER mode. The K3 will show a message indicating that the KPA is ready to go. 
You should be able to set the power level on the K3 to whatever level you need. 
Tapping the OPER button on the KPA will take it back to STBY and the K3’s Power 
level should then show the non-amplified power level.

Of course, if you do not have the AuxIO cable installed, none of this magic can 
occur. The KPA needs to be able to talk to the K3 for our magic to happen.

73!
Jack, W6FB


> On Mar 6, 2020, at 11:24 AM, Don Wilhelm  wrote:
> 
> Tony,
> 
> Look at the CONFIG Menu description in the manual.
> Turn CONFIG:PWR SET to Per Band and then with the AMP on, go to each band and 
> set the proper power to drive the amp on that band.
> 
> With the AMP off, you should have full range of the Power control.
> Yes, you need the AUX cable so the K3 knows the state of the amplifier.
> If you have the KAT500 as well, you will need 2 AUX cables.
> 
> 73,
> Don W3FPR
> 
> On 3/6/2020 2:07 PM, Tony wrote:
>>> Tony, The Config Menu has a Per-Band power setting (PWR SET = PEr bAnd) 
>>> that will set the power output depending on the band selected. If you use 
>>> the Aux cable between the K3 and KPA500 is is fully automatic and seamless. 
>>> 73 George AI4VZ 
>> George:
>> I must be missing something because when I select PER BAND in the config 
>> menu, there's no power setting to set.
>> It doesn't display the power like TUN PWR does where the tune power is shown 
>> within that menu item so you can adjust it.
>> I have to order the AUX cable, but in the meantime I'd like to use this 
>> setting with the K3S so any suggestions would be appreciated.
>> Tony
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Re: [Elecraft] Extra Protection For KPA500?

[Don Wilhelm]

Tony,

Look at the CONFIG Menu description in the manual.
Turn CONFIG:PWR SET to Per Band and then with the AMP on, go to each 
band and set the proper power to drive the amp on that band.


With the AMP off, you should have full range of the Power control.
Yes, you need the AUX cable so the K3 knows the state of the amplifier.
If you have the KAT500 as well, you will need 2 AUX cables.

73,
Don W3FPR

On 3/6/2020 2:07 PM, Tony wrote:


Tony, The Config Menu has a Per-Band power setting (PWR SET = PEr 
bAnd) that will set the power output depending on the band selected. 
If you use the Aux cable between the K3 and KPA500 is is fully 
automatic and seamless. 73 George AI4VZ 


George:

I must be missing something because when I select PER BAND in the config 
menu, there's no power setting to set.


It doesn't display the power like TUN PWR does where the tune power is 
shown within that menu item so you can adjust it.


I have to order the AUX cable, but in the meantime I'd like to use this 
setting with the K3S so any suggestions would be appreciated.


Tony


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[Elecraft] Extra Protection For KPA500?

[Andy Durbin]

"I have a KPA500 and the protection circuit works well, but I was wondering 
what can be done to add an extra layer of protection?"

One approach is to use a micro-controller to manage the KPA500 and KPA500.  
However, most would rather avoid the additional complexity and the, not 
insignificant, development effort.  My goal was to proactively protect against 
all the operator errors that would cause the KPA500 to trip a fault.  I 
considered this to be a better approach than to rely on the KPA500 reactive 
protection. (Don't let the condition happen, rather than protect for it when it 
does happen).

I didn't think of the project as unnecessary complexity.  I saw it as a 
challenge to keep my brain active in retirement.  All the firmware was coded 
while I was monitoring the bands for new DX so no operating time was wasted.

Andy, k3wyc

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Re: [Elecraft] Extra Protection For KPA500?

[Tony]

Tony, The Config Menu has a Per-Band power setting (PWR SET = PEr 
bAnd) that will set the power output depending on the band selected. 
If you use the Aux cable between the K3 and KPA500 is is fully 
automatic and seamless. 73 George AI4VZ 


George:

I must be missing something because when I select PER BAND in the config 
menu, there's no power setting to set.


It doesn't display the power like TUN PWR does where the tune power is 
shown within that menu item so you can adjust it.


I have to order the AUX cable, but in the meantime I'd like to use this 
setting with the K3S so any suggestions would be appreciated.


Tony


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Re: [Elecraft] High Current only on 20 Meters

[Leroy Buller]

The more I think about itI do kinda agree.  Something did get hot cause
it smelled like burning plastic.  No response yet from supp...@elecraft.com

Lee

Lee

On Wed, Mar 4, 2020, 4:30 PM Mark Musick  wrote:

> Hi Lee,
>
> If the ATU is bypassed, it should have no effect.
> I'm betting on a LPF issue.
>
> 73,
> Mark, WB9CIF
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> On Behalf Of Leroy Buller
> Sent: Wednesday, March 4, 2020 21:24
> To: Bob McGraw K4TAX 
> Cc: Elecraft Reflector 
> Subject: Re: [Elecraft] High Current only on 20 Meters
>
> Bob,
>
> Yes I think you are right but I think the amps Hp and Lp are ok because it
> just happens on 20 mtrs.  I think there is something bad in the LPF or
> ATU.  I betting on the ATU.  But not for sure.  Emailed support Lee
>
> On Wed, Mar 4, 2020, 2:11 PM Bob McGraw K4TAX  wrote:
>
> > I would run a TX gain calibration using the K3 Utility and a 50 ohm dummy
> > load.   Then with an external power meter and dummy load, observe the
> power
> > output on each band.   Be sure the ATU is bypassed for this measurement.
> >  This would isolate the issue to the PA, ATU or low pass filter which
> > is band dependent.
> >
> > Bob, K4TAX
> >
> >
> > Sent from my iPhone
> >
> > > On Mar 4, 2020, at 12:46 PM, Leroy Buller 
> wrote:
> > >
> > > I have a K3 that seems to have a problem.  I am getting HI CURRENT
> > warning
> > > only on 20 meters.  The antenna is matched.  80, 40 and 15 do not
> > > have
> > the
> > > issue.  The current meter on the power supply does show quite a bit
> > > of current (20+ amps) on 20 meters but when I reduce power it stops
> > > giving
> > me
> > > the issue on 20 meters.  When I reduce power on 20 meters, the high
> > current
> > > goes away around 65 watts.
> > >
> > > Anyone have an idea what is going on?  I do appreciated the help
> > >
> > > Lee - K0WA
> > > __
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> > > rmcg...@blomand.net
> > >
> >
> >
> >
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Re: [Elecraft] Extra Protection For KPA500?

[Bob McGraw K4TAX]

You can optionally LOCK the MIC, CMP, and PWR control settings. See 
CONFIG: PWR SET


See PWR SET on page 63 of the manual for further details.  There is a 
special function for the KPA500 where 2 sets of power per band are 
saved. One value is for the AMP  and one for Barefoot operation.


73

Bob, K4TAX


On 3/6/2020 12:27 PM, Tony wrote:

On 3/6/2020 12:13 PM, Mark Musick wrote:
I have no idea what you are talking about with the LOCK function. The 
lock function I'm familiar with just locks the VFO A frequency.


Mark:

There's a separate lock function that locks the power setting so you 
can't change it without unlocking it.


Tony

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Re: [Elecraft] Extra Protection For KPA500?

[Tony]

On 3/6/2020 12:13 PM, Mark Musick wrote:

I have no idea what you are talking about with the LOCK function. The lock 
function I'm familiar with just locks the VFO A frequency.


Mark:

There's a separate lock function that locks the power setting so you 
can't change it without unlocking it.


Tony

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Re: [Elecraft] Extra Protection For KPA500?

[Mark Musick]

Tony,
All you need to do is go into the config menu, go to PWR SET and change it from 
"nor" to "Per bAnd".
I have no idea what you are talking about with the LOCK function. The lock 
function I'm familiar with just locks the VFO A frequency.
As to the input protection circuit on the KPA500, I'm sure it is pretty robust 
and knowing Elecraft I wouldn't worry about it failing.
Of course you don't want to hit the KPA500 with 100 Watts. I would think you 
would want to develop some sort of operating procedure for your shack to make 
sure that doesn't happen. 

73,
Mark, WB9CIF

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Tony
Sent: Friday, March 6, 2020 06:06
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Extra Protection For KPA500?

All:

Thanks for the advice regarding protection for the KPA500. I use more than one 
rig with my KPA500 so one has to pay attention to the drive levels. I suspect 
the protection circuit could fail if you accidentally pump 100 watts into the 
amp now and then.

Regarding the K3S power-per-band setting: it looks like it requires the LOCK 
function to keep the power level one chooses. Is that the way it works or is 
there another option besides LOCK?

Tony

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Re: [Elecraft] K-4D for SO2R

[M. George]

I asked Eric last year in Xenia about supporting full duplex / i.e. so2r in
a box.  He didn't say no, and he hedged a bit around the topic. A bit of a
wink, wink. So maybe eventually... let's cross our fingers:
https://www.youtube.com/watch?v=QakxQGFaDwA

Max NG7M

On Fri, Mar 6, 2020 at 5:52 AM Art Suberbielle  wrote:

> Will the K-4D be able to receive on one band while transmitting on a
> different band?
>
> Still wondering how the radio will transmit CW via remote with my iPad...
>
> 73,
>
> Art KZ5D
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-- 
M. George
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Re: [Elecraft] Extra Protection For KPA500?

[Bob McGraw K4TAX]

Likewise I use two different radios on the desk.  With the non-Elecraft radio I 
do have to exercise operator caution.  

Bob, K4TAX


Sent from my iPhone

> On Mar 6, 2020, at 12:19 AM, Tony  wrote:
> 
> All:
> 
> Thanks for the advice regarding protection for the KPA500. I use more than 
> one rig with my KPA500 so one has to pay attention to the drive levels. I 
> suspect the protection circuit could fail if you accidentally pump 100 watts 
> into the amp now and then.
> 
> Regarding the K3S power-per-band setting: it looks like it requires the LOCK 
> function to keep the power level one chooses. Is that the way it works or is 
> there another option besides LOCK?
> 
> Tony
> 
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[Elecraft] K-4D for SO2R

[Art Suberbielle]

Will the K-4D be able to receive on one band while transmitting on a
different band?

Still wondering how the radio will transmit CW via remote with my iPad...

73,

Art KZ5D
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