Re: [Elecraft] Using KPA1500 with Flex6600

[rocketnj]

It will work with either the USB or network connection to PC.

73
Dave wo2x



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Ray Spreadbury via Elecraft
Sent: Tuesday, June 21, 2022 2:10 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Using KPA1500 with Flex6600


Dave, thanks for the tip to use the KPA1500 Remote Ap which I have now
downloaded. Now I have to try to connect to it using a USB cable to the PC
Ray G3XLG

Sent from Mail for Windows

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Re: [Elecraft] Relocating my KPA-1500 - need cable

[rocketnj]

Running 1500 watts on 6 meters does get the fans going 😊

73
Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Julia Tuttle
Sent: Saturday, June 4, 2022 12:45 AM
To: j...@kk9a.com
Cc: Elecraft 
Subject: Re: [Elecraft] Relocating my KPA-1500 - need cable

Fan noise?

On Fri, Jun 3, 2022, 23:11  wrote:

> Why?
>
>
>
> w2irt.net wrote:
>
>  if it keeps the amp far away from the shack I'll be happy.and 
> so will the XYL .
>
>
>
> - pjd
>
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> ju...@juliatuttle.net
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Re: [Elecraft] Relocating my KPA-1500 - need cable

[rocketnj]

Hi Bob,

Peter already has the rig to Y-Box cable. He just needs to replace the Y-Box to 
amp cable with longer one.

Peter, replacing the amp to Y-Box cable with longer one is the best method for 
remoting your amp. The Ethernet cable from amp to switch in basement will allow 
you to use the KPA1500 remote utility. If memory serves, it shows recommended 
power on bottom when tuner is engaged. I had to reduce power on certain 
sections of 80 meter band.

73
Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Bob Wilson, N6TV
Sent: Thursday, June 2, 2022 10:27 PM
To: Peter W2IRT ; Elecraft Reflector 
Subject: Re: [Elecraft] Relocating my KPA-1500 - need cable

On Thu, Jun 2, 2022 at 6:28 PM  wrote:

> Not sure what you mean by “set drive power” this is something I 
> generally do manually, but would love the ability to do it 
> automatically based on band segment.
>

The K3 will automatically memorize and recall the required drive level set on 
each band, but not each band segment, if you set K3 *MENU:PWR SET* to *PER 
BAND*.  The K3 remembers two drive levels per band, one "barefoot", and the 
other "when the AMP is ON and in OPER".  So you can leave the K3 set to 100W 
drive, then turn on the AMP and put it in OPER mode (you'll see a message on 
the K3 when you do that, if connected properly), then turn down the PWR knob to 
set the drive level needed on that band when you're using the amp.  An asterisk 
appears next to the power level on the K3 display, to indicate that you are 
setting the "when the amp. is in OPER" power level.
The asterisk goes away when you put the amp. in STBY or OFF.  Set the drive 
needed once, each band, with the amp. in OPER mode, and and you're all set; the 
K3 will set the drive power to the last-used values for amp in OPER mode, on 
every band.

The KPA1500 tuner is set by band *segment*, but not the drive power.

40m SSB is a problem child for me where a short Yagi means I have to cut
> back drive power above 7175 or so due to SWR.
>

The K3 will not remember that.  How high is the SWR up there?  I assume you are 
using the KPA1500 ATU, but if SWR is >3:1, I don't think you can run 1500W even 
with the tuner engaged.


> I really want the exact same functionality that I have with the amp 
> here in the shack, connected via the old Y-Box.
>

Yes, you will get that by extending the AUX cable, which must be in series with 
the extension.  I would try the length you need to see if it works.
Chances are it will work fine if you use a quality cable.

I will do an accurate measurement, but I’m pretty sure it’s somewhere
> between 15 and 20 feet between the Y-box and the proposed location of 
> the amp.
>

Should work fine.  I can supply a 2.5' M/M cable from rig to Y-BOX if you need 
one.

On Thu, Jun 2, 2022 at 6:33 PM  wrote:

> Forgot to add in my reply that I have LAN connectivity at the proposed 
> amp location, connected directly from the main switch on the other 
> side of the basement.
>

Great, then you only need one 15-pin cable or one new Ethernet run, not two.

73,
Bob, N6TV
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Re: [Elecraft] K4 Data Mode Questions

[rocketnj]

I'll answer #2 first - if WSJT-X is set to Data/Pkt (which it should) in 
setup/radio then yes, the radio will switch to DATA

#1 - I am guessing you are using the USB cable to PC for sound? Check Windows 
Line USB Audio CODEC and make sure level in Windows is 100. Then on radio tap 
TX and Line IN. Make sure it is set to sound card and I have my level at 32 to 
give 5 bars when I click the TUNE button in WSJT-X. I also have power slider in 
WSJT-X all the way up.

Hope this helps!
Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of James Bennett via Elecraft
Sent: Friday, May 6, 2022 3:52 PM
To: Elecraft Reflector Reflector 
Subject: [Elecraft] K4 Data Mode Questions

Two questions on using my new K4D for data mode, specifically, FT8.

First, with both VFOs set to DATA mode, no matter what I do I am only able to 
get two bars on the ALC meter. I read in the operator’s guide that I should 
keep it under the “5” mark. On my K3, I always kept four solid bars and the 5th 
flickering. Obviously two bars is wy under that “5” mark, but why, when I 
advance the MIC level from 1 all the way to max, does the ALC meter only stay 
at two bars? I am able to make contacts on FT8 so the thing is working, but I’m 
puzzled. Should I be able to get more than two bars of ALC in DATA mode?

Second - the K4 seems to think for itself. After scratching my head regarding 
that ALC level issue, I decided to try using USB mode. I put both VFOs into USB 
and…… this sneaky radio automatically switched both of ‘em back to DATA mode as 
soon as I transmitted. Is that normal / expected?

Jim / K7TXA
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[Elecraft] K4D - programming command to set or get low and high cut RX filters?

[rocketnj]

Hi All,

 

I am writing a Node Red interface to the K4D and looking through the
programming reference manual. Is there a command to retrieve or set actual
current low or high cut values of the receive filter? This would be useful
as a way to have more than three filters defined. I know there is a command
to select one of the three filters in the radio, but looking to be able to
change those from an external source.

 

 

73

Dave wo2x

 

 

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Re: [Elecraft] Shipping via UPS - A Lesson Learned the Hard Way

[rocketnj]

I have a shipping scale here and prepare my own shipping labels for UPS,
including insurance. Then I can go to the UPS Store and drop it off without
paying their high fees. I do the same for Fed Ex and USPS. 

73
Dave wo2x




-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of eda...@aya.yale.edu
Sent: Monday, April 11, 2022 6:30 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Shipping via UPS - A Lesson Learned the Hard Way

I just shipped some of my Elecraft gear to someone who had purchased it from
me.  The agreement was that I would ship it and they would bear the shipping
expense.  The buyer was OK with my using UPS.

 

So I packed it up and took it to "The UPS Store."  There are about 30 of
them in the Denver metro area and about a dozen in the city itself.  Before
taking the package there I looked at UPS on-line to see what insurance would
cost.  The UPS site said $1.05 per hundred dollars in excess of the $100
included in the shipping rate.  When I arrived at the UPS Store they charged
me $4.50 per $100.  That difference times the value of what I was shipping
came to well over $100.  When I questioned it (more accurately, when I
complained about it) they told me that UPS and The UPS Store are different
entities.  The latter, they said, is a network of franchises independent of
the real UPS that "works with" UPS for retail shipping and receiving.  So
what I had seen on the UPS website was what UPS charges, not the grossly
inflated premium The UPS Store charges.  OK, I asked, how can I ship this
via UPS itself?  The answer was a 90 minute round-trip drive to the nearest
real UPS terminal.

 

The UPS Store does not charge real UPS rates.  They have UPS in their name.
They use a logo indistinguishable from the UPS logo.  Their counter clerks
wear UPS Brown.  There was a standar UPS truck parked in front of the shop.
There was NOTHING visible to me in the store that indicated it wasn't a UPS
shop.  Maybe everyone on this reflector already knows about this.  Until
this morning I didn't.  

 

There's an old maxim that a happy customer tells one other person about
their experience.  An unhappy customer tells ten other people.  

 

Ted, KN1CBR 

 

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[Elecraft] K4D R29 beta ESSB and CESSB - Rolls off low end TX frequency response when COmp at 1 or higher.

[rocketnj]

Hi All,

 

Just received a K4D from a friend. I have it connected and just getting used
to the radio. 

 

We operate ESSB (4 kHz LSB) on the lower end of 80 meters where there is
ample room without causing interference. When you rag chew for several hours
it is much more pleasing to listen to.

 

I upgraded the radio to R29 beta and set TX to ESSB and TX BW to 4 kHz.
First thing I noticed is the low frequency rolloff point is fixed and not
adjustable. The TX bandwidth seems to use the same low frequency cutoff.

Second thing I noticed is the CESSB compressor seems to be programmed in
both ESSB and normal TX mode as a mid band compressor, boosting the
midrange, which then makes the audio sound very flat. This happens as soon
as compression is 1 or higher.

 

This is fine for normal SSB TX to add punch and help crack pileups but in
ESSB mode it should affect the complete TX passband. I guess I have gotten
used to a couple of other brand SDRs that do use CESSB and don't attenuate
the lows and highs when engaged.

 

I'd like a feature request that the CESSB compression work over the whole
range of TX audio in ESSB mode and also have the low frequency and high
frequency cutoffs on TX in ESSB be adjustable, just like the RX filters are.
The CESSB implementation for normal SSB is fine.

 

73

Dave wo2x

 

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Re: [Elecraft] KAT500 ANT1 problem

[rocketnj]

Yes, Andrews especially for Heliax hardline 😊

73
Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of j...@kk9a.com
Sent: Monday, July 12, 2021 11:09 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT500 ANT1 problem

So does Andrew/Commscope.

John KK9A

WO2X wrote:

Times Microwave also make good connectors. We use them on UHF, but most cables 
we make are designed to be put in place semi-permantly.

73
Dave wo2x

Sent from my iPad

> On Jul 12, 2021, at 12:07 AM, Jim Brown  wrote:
> 
> On 7/11/2021 1:52 PM, Dave wrote:
>> What had apparently happened was that I had a batch of the offshore 
>> made "Amazon Special" PL-259s that appear to have a slightly oversize center 
>> pin.
> 
> For several decades, I've served on the Standards Committee of the Audio 
> Engineering Society with representatives of the two best mfrs of audio 
> connectors -- Switchcraft and Neutrik. Both report having had problems with 
> counterfeits of their parts, and that out of tolerance pretty common. Some 
> major mic mfrs, both US and EU, have reported counterfeiting of their 
> products.
> 
> Years ago, I learned that cheap, no-brand connectors are a very expensive 
> mistake. When I got back on the air in 2003, I stocked up with several dozen 
> adapters that, over the next ten years caused me no end of grief.
> 
> In North America, if a UHF, BNC, or type-N connector isn't branded Belden or 
> stamped with a MIL part number, it's junk.
> 
> 73, Jim K9YC

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Re: [Elecraft] Remote Programs for KPA500 & KAT500

[rocketnj]

Node Red. Runs on a Raspberry Pi connected locally to amp and tuner then
control and monitor available from a web browser, both locally and remote.
Access remotely can be secured to prevent unauthorized access.

Irwin, I am planning a demo of Node Red to FRC club on one of the informal
Tuesday evening meetings.

73
Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Irwin KD3TB
Sent: Saturday, March 6, 2021 2:07 PM
To: elecraft@mailman.qth.net; elecraft...@groups.io
Subject: [Elecraft] Remote Programs for KPA500 & KAT500

In addition to the KPA500 & KAT500 Utilities, are there any remote programs
that can control the amp and tuner remotely either through the USB port or
an Internet connection?

Thanks,  Irwin KD3TB
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Re: [Elecraft] Buyer Beware!

[rocketnj]

Already removed.

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of W6IPA
Sent: Saturday, February 27, 2021 3:30 PM
To: Ron Manfredi 
Cc: Elecraft Refl ; Grant Youngman 

Subject: Re: [Elecraft] Buyer Beware!

Thanks for explaining - this is definitely suspicious - I did not go as far as 
going through the pictures.

Thanks for the education

Jc/W6ipa


On Sat, Feb 27, 2021 at 11:06 AM Ron Manfredi  wrote:

> Well one of their photos has   text that tells you  they will not respond
> through the E-Bay mail system, and that any bids will be removed.   No
> matter what their feedback rating, those policies should be enough of a
> warning.   I am surprised that E-Bay hasn't banned them.
>
> Ron   WA2EIO
> On 2/27/2021 1:59 PM, W6IPA wrote:
>
> Is it a group private joke or is there actual facts that leads to 
> these statements ?
> I mean if the reports are line these posts - what can eBay do given 
> that the seller has 100% positive feedback ?
>
> Jc/W6ipa
>
> On Sat, Feb 27, 2021 at 10:50 AM Grant Youngman 
> wrote:
>
>> They posted a large number of items this morning in the Ham Radio 
>> category (and probably many other places).  I’m getting carpal tunnel 
>> filing “reports”, although it isn’t clear that eBay actually cares much.
>>
>> Grant NQ5T
>>
>> > On Feb 27, 2021, at 1:43 PM, Ron Manfredi  wrote:
>> >
>> > Also here:
>> >
>> >
>> https://www.ebay.com/itm/collection-Marine-chronometer-847-A-Lange-So
>> hne/313435822886?hash=item48fa3b1b26:g:akgAAOSw309gOowL
>> >
>> > Seems they like high-end technical gear.
>> >
>> >
>> > Ron   WA2EIO
>> >
>> >
>> >
>> > On 2/27/2021 1:38 PM, Grant Youngman wrote:
>> >> The eBay fraud crew is back in full force.
>> >>
>> >> https://www.ebay.com/itm/Elecraft-K-Line/313435863056
>> >> __
>>
>> __
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>> w6...@poxika.net
>
>
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Re: [Elecraft] Sudden KPA1500 power reduction

[rocketnj]

1. Depends. My KPA1500 has same NXP 1K50H devices as my PG-XL. (yes, I have
both). I heard some KPA1500s had different devices than the NXP but cannot
confirm that

2. Yes. Shipping for a while now.

Here's my comparison of the two since I own both. The KPA1500 fan noise is
better to my ears sitting on the desk 4 feet from my operating position that
the PG-XL. I use the 1500 at home while the PG-XL due to its LAN integration
to the Flex radio is at the remote site 20 miles away.

Both are great amps and with the last updates done to my KPA1500 a little
over a year ago it has been trouble free.

Dave wo2x

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Charlie T
Sent: Sunday, February 21, 2021 1:31 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Sudden KPA1500 power reduction

Just curious, does the big FLEX amp use the same two LDMOS devices?
2nd question, have they shipped any yet? (probably not the right place to
ask)

73, Charlie k3ICH



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Roy
Sent: Sunday, February 21, 2021 12:47 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Sudden KPA1500 power reduction

Ditto here -- mine's at the factory.

73,  Roy,  K6XK

On 2/21/2021 11:32 AM, Frank Scolaro wrote:
> Happened to me several months ago...  one LDMOS out! same symptoms.  You
need the power with such great band conditions...
>
> GL
> Frank, W2YK
>
>
>

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Re: [Elecraft] Sudden KpA1500 power reduction

[rocketnj]

Just my guess is one of the LDMOS devices let out the magic smoke? 
Just a thought...

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Dana Roode K6NR
Sent: Saturday, February 20, 2021 9:16 PM
To: Elecraft Reflector 
Subject: [Elecraft] Sudden KpA1500 power reduction

I'm in the ARRL CW contest this weekend and the KPA1500 has been working
fine.  However, a few minutes ago I noticed I was getting about half the
output power on 20 meters that I typically get with around 30 watts drive
(about 600w vs 1200w).  PA current is less than normal, around 30a.
Similar problem on the higher bands, I can no longer get 1000w.  On 40m I
can, but it requires more drive.

Seems like something died in the amp; I'm not familiar with the design, but
perhaps an output module.  No errors or ill behavior from the amp other than
the loss of power.

I will contact Elecraft support unless there is something I'm missing here.
I just looked in the archive and see that this has happened to others  I
use the amp remotely so I guess I'll have to take it home with me.

  Dana
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Re: [Elecraft] KPA 1500 fan speed at turn off

[rocketnj]

I use Node Red to control and monitor the KPA1500. I have written into the
flow to delay turn off of the amp when I click power off until the
temperature of the amp is down to 38 C. The fans are programmed to turn off
@ 39C.
This way I can walk away after clicking OFF and not wait for it to cool off.

Node Red is free and the amp can be controlled from any web browser.

73
Dave wo2x



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Howard Sherer
Sent: Thursday, January 21, 2021 8:19 AM
To: elecraft 
Subject: [Elecraft] KPA 1500 fan speed at turn off

Wouldn't it be a good idea to keep the fan turned on in the KPA-1500 after
you power it off till the internal temperature reaches its lower temp?

 Howard
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Re: [Elecraft] KPA1500 goes into firmware load

[rocketnj]

I use the Wake on LAN packet via Ethernet to turn on my KPA1500. This is sent 
from a flow I wrote in Node Red running on a Raspberry Pi. It allows me control 
and monitoring of the amp (meters, power on/off, op/standby, ant 1/2) from any 
web browser, including smartphones with two factor authentication.
Using this method I have not had the KPA1500 go into firmware upload mode.

73
Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Gary Johnson
Sent: Tuesday, January 12, 2021 6:34 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 goes into firmware load

Dick has pointed me at the mechanism. I had forgotten that the REM input is fed 
from the K3 12V output, and that is what turns the amp on. If that input is at 
12V when applying 240V, you go into firmware load. 

So a slight mystery remains, as reported by others, that this sometimes occurs 
for no apparent reason, at times when we’re "pretty sure" the 240V is already 
on.  When dead-starting and turning on the 240V, I always wait a few sec before 
turning on the K3 remotely. But sometimes it comes up in firmware load anyway. 
Thankfully this is always recoverable.

FYI: You can also turn on a KPA1500 or 500 by pulsing a line in the Aux bus via 
a K3 macro. Info on this is on p. 21 of the K3 Remote Owner's Manual.

Gary NA6O


>On Jan 12, 2021, at 11:23 AM, Dick Dievendorff  wrote:

If you have 12v on the KPA1500 REM line when the KPA1500 AC lower is turned on, 
it interprets this as a hold down of a power button, causing entry into the 
firmware loader.  Do you have anything connected to the KPA1500 REM RCA 
connector?

73 de Dick, K6KR

>>On Jan 12, 2021, at 11:16, Gary Johnson  wrote:

We have a K3 and KPA1500 at a remote site. The KPA has 240V applied to it all 
the time, and actually turns on with the K3 via the Aux Bus. We use the remote 
control application via Ethernet. Works great. Occasionally, the amp won’t turn 
on, and when we investigate, it’s in the firmware load state. The KPA1500 
Utility is then able to reload it via USB, and we’re operational again. Nothing 
on the computer should be accessing its USB port to cause it to go into that 
state. I have noticed that if we cycle the 240V power, sometimes that will put 
it in firmware load as well. Is there a common cause here?

-Gary NA6O
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Re: [Elecraft] help with writing a macro for the KPA 1500

[rocketnj]

To elaborate, the ^PF0 and ^PF1 are not valid commands. If you want to
string multiple commands on a button, each command must be followed by a
semicolon with no spaces.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Howard Sherer
Sent: Saturday, October 24, 2020 3:13 PM
To: elecraft 
Subject: [Elecraft] help with writing a macro for the KPA 1500

I am trying to write macros for the PF 1 & 2 keys for the KPA 1500.

My objective is:
Have the PF1 button switch the Input to the K3s with the command ^PF1^XI0;
Have the PF2 button change the input type to serial (for Flex) with the
command ^PF2^XI3;

Neither one is working, where am I going wrong?

I assume that after I have these working with the command tested in the
1500 util, that saving them will send them to program the buttons on the
1500? Is this correct?

Howard
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Re: [Elecraft] help with writing a macro for the KPA 1500

[rocketnj]

Use the KPA1500 Utility program. In the PF box for PF1 just put ^XI0;
In the PF2 box put ^XI3;

No need to put PF1 and PF2 in front.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Howard Sherer
Sent: Saturday, October 24, 2020 3:13 PM
To: elecraft 
Subject: [Elecraft] help with writing a macro for the KPA 1500

I am trying to write macros for the PF 1 & 2 keys for the KPA 1500.

My objective is:
Have the PF1 button switch the Input to the K3s with the command ^PF1^XI0;
Have the PF2 button change the input type to serial (for Flex) with the
command ^PF2^XI3;

Neither one is working, where am I going wrong?

I assume that after I have these working with the command tested in the
1500 util, that saving them will send them to program the buttons on the
1500? Is this correct?

Howard
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Re: [Elecraft] ARRL Award to Jim Brown, K9YC

[rocketnj]

Jim is well deserving of the award!

Dave wo2x

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Dauer, Edward
Sent: Sunday, October 11, 2020 9:31 PM
To: 'elecraft@mailman.qth.net' 
Cc: Jim Brown 
Subject: [Elecraft] ARRL Award to Jim Brown, K9YC

If this has already been announced here, forgive me; when life is busy as it
has been over the last couple of weeks I don't always read the reflector.
In any case the news is worth repeating.

In the October issue of QST, at p. 62, the ARRL announced that Jim Brown,
K9YC, a frequent contributor to this reflector, was awarded the ARRL's
Technical Service Award for 2020, recognizing his numerous contributions to
Amateur Radio in numerous venues.  I won't repeat the encomium here; just
wanted to share my congrats to Jim.

Ted, KN1CBR

 

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Re: [Elecraft] KAT500 remote

[rocketnj]

You could possibly look at Node Red which runs on a Raspberry Pi. I use it with 
a KPA1500 and I know there is a flow (programming) for the KPA500 as well. The 
Pi runs on your home network and you use a USB to serial cable from the KPA500 
to the Pi. You can control and monitor the amp from any web browser.

If you are interested we have a Google Groups.io site 
https://groups.io/g/nodered-hamradio

Here's a picture of my Node Red dashboard. The panel on the left is for the 
KPA1500. The layout is customizable.
https://github.com/wo2x/NodeRed/blob/master/Main.JPG

73
Dave wo2x




-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Gordon LaPoint
Sent: Friday, October 9, 2020 2:13 PM
To: Elecraft Reflector 
Subject: [Elecraft] KAT500 remote

I use the KAT500 remote software and it works great. I have only one problem 
with it, I can not tell if the power is on or off. This matters because when 
the remote site looses power the state of the KAT500 is unknown and the program 
does not indicate if the power is ON or OFF.  Is there a way to tell?

I can keep trying the POWER button then the TUNE button until it works, but it 
would be much better for a positive indication of the power state by button 
color or some other indication in the application.

I have set the "Initial Power" in the KAT500 utility to be "Power On" 
when DC  is applied, but not sure this is always observed.  I have no other way 
to see the remote site when this happens.

Any suggestions?

Gordon - N1MGO


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Re: [Elecraft] KPA1500 firmware 2.48 beta available

[rocketnj]

Using 2.48 here and no issues ragchewing on 80 meters or doing digital
FT8/FT4 on several different bands. I have the XCVR port connected to the
USB port of a Flex 6700 via the KXUSB cable.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Bob Wilson, N6TV
Sent: Thursday, October 8, 2020 6:21 PM
To: Elecraft Reflector 
Subject: Re: [Elecraft] KPA1500 firmware 2.48 beta available

Correct link is:
https://elecraft.com/pages/kpa1500-1500-watt-linear-amplifier-firmware-and-u
tility

I used this version during CQP on two KPA1500s and had zero issues.

73,
Bob, N6TV


On Wed, Oct 7, 2020 at 9:43 AM Dick Dievendorff  wrote:

> We've made a new KPA1500 Beta firmware revision available on our web site.
>
>
>
> Details here, just after the middle of the page under heading "BETA 
> FIRMWARE INSTALLATION AND RELEASE NOTES"
>
>
>
>
> https://elecraft.com/pages/kpa1500-1500-watt-linear-amplifier-firmware
> -and-u
> tility
>
>
>
> 73 de Dick, K6KR
>
>
>
>
>
>
>
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Re: [Elecraft] Local KPA1500 operation via KPA1500 remote

[rocketnj]

Glad you got it working!

73
Dave wo2x


-Original Message-
From: Jim Cary  
Sent: Saturday, September 19, 2020 4:23 PM
To: rocke...@gmail.com
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Local KPA1500 operation via KPA1500 remote

HI Dave,

The key was using the “find KPA1500) on the remote tab.  Working now.

Thanks.

73,

Jim
W2SM


> On Sep 19, 2020, at 4:00 PM, rocke...@gmail.com wrote:
> 
> Verify your baud rate and com port in the remote program (USB) matches the 
> port and baud when using the utility program. Since the utility program works 
> the cable connections are good.
> I am using 230400 baud
> 
> You can also select Local Connect/USB in the remote program and select find 
> KPA1500. It will take a few minutes, depending on how many com ports the PC 
> has.
> 
> Dave wo2x
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
>  On Behalf Of Jim Cary
> Sent: Saturday, September 19, 2020 3:09 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] Local KPA1500 operation via KPA1500 remote
> 
> I’m having trouble configuring the KPA1500 remote software for local control 
> of my KPA1500 using USB or Ethernet ( I want to locate the amp in the 
> basement).  I assume I am supposed to use the “Local Connect” tab, but when I 
> hit the “connect” button, it says “unable to connect on Com………” and “KAT 
> Remote not running.”
> 
> The com connection does work with the Utility (and the Utility isn’t running 
> at the same time).
> 
> Obviously I’m doing something wrong here, so would appreciate some help.
> 
> I can use the KPA1500 Utility to do the same thing, but it is not as “elegant”
> 
> Jim
> W2SM
> 
> 
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> 


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Re: [Elecraft] Local KPA1500 operation via KPA1500 remote

[rocketnj]

Verify your baud rate and com port in the remote program (USB) matches the port 
and baud when using the utility program. Since the utility program works the 
cable connections are good.
I am using 230400 baud

You can also select Local Connect/USB in the remote program and select find 
KPA1500. It will take a few minutes, depending on how many com ports the PC has.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Jim Cary
Sent: Saturday, September 19, 2020 3:09 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Local KPA1500 operation via KPA1500 remote

I’m having trouble configuring the KPA1500 remote software for local control of 
my KPA1500 using USB or Ethernet ( I want to locate the amp in the basement).  
I assume I am supposed to use the “Local Connect” tab, but when I hit the 
“connect” button, it says “unable to connect on Com………” and “KAT Remote not 
running.”

The com connection does work with the Utility (and the Utility isn’t running at 
the same time).

Obviously I’m doing something wrong here, so would appreciate some help.

I can use the KPA1500 Utility to do the same thing, but it is not as “elegant”

Jim
W2SM


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Re: [Elecraft] Seeking comments on Ham Expo from participants

[rocketnj]

 The event was free and enjoyable. Being able to interact via chat with reps
from different companies was a great idea. The prerecorded presentations
were for the most part great.

The site navigation needs to be improved, especially on an iPad. The text
chat on the iPad had the last line of text in a long chat obscured by the
text entry window where you enter your own text. Also default view of a
booth did not show the navigation bar underneath. You needed to take your
finger and drag the window down to see it. The Chat button should be more
prominent and not all the way to the right. These are things that can be
fixed for next time.

Again, in the crazy world we live in now it was enjoyable to have some time
to take our mind away to better thoughts (buying a new radio or amp).

Dave wo2x


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Re: [Elecraft] KPA1500 Alpha testers sought: Kenwood, Flex, Yaesu exciters

[rocketnj]

Hi Dick,

I would be interested in participating. Using a Flex 6700 via the KXUSB
cable from amp direct to USB port on radio. Set up to track the TX slice on
radio. Been working fine. Flex has a setting to auto poll.

I also have written a flow for Node Red to monitor and control the amp via a
web browser. Using the Ethernet IP connection and sending the ^ commands for
control and monitoring/info. Node Red runs on a Raspberry Pi on the network.


I will reply to you via direct email with my direct contact info.

73
Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Dick Dievendorff
Sent: Monday, July 27, 2020 7:05 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Alpha testers sought: Kenwood, Flex, Yaesu
exciters

I've made some recent changes to KPA1500 processing of transceiver frequency
messages from Kenwood, Flex, and Yaesu radios.  Icom CI-V is unchanged.

 

If you use one of these radios and use the KPA1500's XCVR SERIAL connection
to communicate the transceiver's frequency to the KPA1500, I'd appreciate
your help in testing a new version. If you generally use a logging program
to poll the radio and the KPA1500 is set up to observe the commands and
responses, that helps, too.

 

Thanks! 

 

73 de Dick, K6KR

 

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Re: [Elecraft] KPA 1500 HELP!!

[rocketnj]

Sounds like one of the LDMOS devices may have let out the magic smoke.

Contact support so they may properly troubleshoot the issue with you.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Salvatore ["Ted"] K2QMF
Sent: Saturday, July 25, 2020 2:07 PM
To: Dr. William J. Schmidt ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA 1500 HELP!!

When I disconnect the red and black cable from the PS and turn on the PS and 
amp the HV/Supply Light stays GREEN!!  I tried to reseat both ends of the power 
cable but problem still exists!! as soon as I turn on the amp with both ends 
connected the PS HV/Supply light turns RED!!!
HELP!!
Ted  K2QMF


Disconnect the power (red and black) cable between the amp head and the power 
supply and turn the amp on. Is the "HV" light on the power supply still RED? If 
so, the power supply is bad... send it in for repair.


Dr. William J. Schmidt

Moderator – North American QRO Group at Groups.IO.

email: b...@wjschmidt.com



-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Salvatore ["Ted"] K2QMF
Sent: Saturday, July 25, 2020 12:39 PM
To: Elecraft Support ; elecraft@mailman.qth.net
Subject: [Elecraft] KPA 1500 HELP!!

Hello,
I was in the IOTA Contest and a got a Fault message"FAULT: 50V Supply 
0.0Volts"!!!
I can't reset this Fault!!
And the HV/Supply Light on the PS is RED!
I tried turning the PS off and back on but no change!!
Any help or suggestions much appreciate...
73,
Ted K2QMF

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Re: [Elecraft] KPA1500 with K4 tracks VFOs with 1 kHz resolution

[rocketnj]

I have seen this behavior using a non-Elecraft exciter (Kenwood) and KPA1500
amp on digital modes. In my case it was right after connecting the new radio
and TX audio levels were too high, causing splattering. The freq counter in
the amp wasn't happy. Lowered audio level to where there is no ALC
deflection on the exciter and problem never happened again. 

Just a thought but check your ALC when on WinLink. You should not see any
ALC indication. 

Dave wo2x

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Lyn Norstad
Sent: Tuesday, July 21, 2020 5:40 PM
To: 'Wayne Burdick' ; 'Andy Durbin' 
Cc: 'Elecraft Reflector' 
Subject: Re: [Elecraft] KPA1500 with K4 tracks VFOs with 1 kHz resolution

Interesting ... I am seeing issues with my KAT500 not holding a setting, but
jumping to (and displaying) a frequency 200 - 300 KHz lower unpredictably
during a Winlink Vara session.  It always comes back to the correct
frequency when the rig is transmitting, but has to go thru a short
relay-clatter routine to get there.

This is on 80, 40 and 30 meters (all I have tested so far).

For example, if the dial frequency is at 7101 the tuner can't seem to decide
whether to sit on 7104 or 7096.  That doesn't seem to cause a problem as
much as when it suddenly drops to 6874, 6864 or 6856.  I am seeing similar
behavior on 80m and 30m.

I recently did a total reset and reloaded the firmware (v01.75).

Any thoughts?  Bin width?

Thx.
73
Lyn, W0LEN
Message delivered to rocke...@gmail.com 

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Re: [Elecraft] KPA1500 with K4 tracks VFOs with 1 kHz resolution

[rocketnj]

Hi Wayne,

Can future KPA1500 firmware allow the smaller bins to be utilized via
standard CAT protocol over TCP/IP? I can feed the amp exact frequency info
via a Node Red Raspberry Pi. Right now using CAT over the KXUSB cable. 
Also it would be desirable to have CAT take priority over internal frequency
counter on the amp. I've had the internal counter fail and the amp was in
never never land when trying to transmit.

I do have to say that after all the mods were done (current to when I sent
in the RF deck) the amp has worked flawlessly. Many thousands of QSOs.  
Any way to track if there are additional mods to the amp that have been
incorporated since last serviced? I would think if there were something
major that existing owners would be notified.


73
Dave wo2x



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Wayne Burdick
Sent: Monday, July 20, 2020 12:26 AM
To: Andy Durbin 
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] KPA1500 with K4 tracks VFOs with 1 kHz resolution

Andy (K3WYC) wrote:

> I still don't see the advantage of AUX bus giving the KPA1500 the TX
frequency to 1 kHz resolution.   What am I missing?


Hi Andy,

The improved resolution ensures that the correct bin is detected when you
get within +/- 1 kHz of the target ATU LC data bin rather than +/- 8 kHz.
This improves repeatability of selected LC values vs. VFO frequency,
especially on 160 and 80 meters where it's most likely to matter.

This also means that, in the future, we could use smaller bin width on some
bands if desired. This could be helpful if you were using the ATU to
fine-tune a very narrowband antenna such as a loop or electrically short
vertical.

73,
Wayne
N6KR


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Re: [Elecraft] KPA-1500 Pure Signal Output

[rocketnj]

Yes, depending on serial number of your amp it will output the correct level 
without any additional attenuation. New amps have the mod already done. I 
modified my amp s/n 423 by changing two surface mount chip resistors on the 
filter board in the amp. Not for the faint of heart. One of the chip resistors 
is the size of "16" in the date 2016 on a penny. TINY!!! 

On older non-modified amps Pure Signal will only work at higher power since the 
level out the sample port is too low. It will work in the 1000 to 1500 watt 
range but not down to 20 watts like it does after the mod. Current production 
amps have this mod done along with several other mods that were incorporated 
after my amp was purchased.

I HIGHLY recommend this mod be done by Elecraft unless you absolutely have the 
experience and equipment to do surface mount rework properly. Last thing you 
want is a $6000 paper weight
I do not know when this mod was put into production amps.

My Pure Signal has performed from 20 to 1500 watts output withy an Anan 7000dle 
(blue face) without any attenuation added. I have since sold the Anan but 
keeping the KPA1500 as it works VERY well. Solid and dependable after several 
mods were done to bring it up to current production standards.

If you think I am kidding about the size of the chip resistor I can send a 
picture to anyone interested. I did take a picture next to a 2016 penny for 
reference 😊



-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of char...@k5ua.com
Sent: Thursday, July 2, 2020 4:12 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KPA-1500 Pure Signal Output

Does anyone know if the RF coupler output in the KPA-1500 is functional yet? 

Charles  K5UA
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Re: [Elecraft] Help with KPA1500 P/S

[rocketnj]

Are you talking about removing the cable from the amp? It just pulls out. There 
is some tension on the contacts so it will require a little force. Just pull 
straight out.

If you are talking about the chassis mounted Power Poles, there are screws on 
the inside that hold a bracket and wedge which keep them secure to the chassis.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Salvatore Ted K2QMF
Sent: Monday, June 8, 2020 4:02 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Help with KPA1500 P/S

Hello All,
How do you remove the PowerPoll P/S connector from the back of the KPA1500??
Any help much appreciated!
I don't want to force them out!
Thanks,
Sal  K2QMF

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[Elecraft] KPA1500 fan mod done - MUCH better

[rocketnj]

Hi All,

 

Received the new LED board for my KPA1500 power supply. Easy to swap out,
six plugs and two screws. You can move one plug at a time to the new board
so there is no chance of screwing anything up. To put the screws back in I
suggest a Phillips screwdriver with magnetic tip. It took more time to
remove the 16 screws from the top cover than to swap the board.

 

THANK YOU Elecraft!

 

73

Dave wo2x

 

 

 

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Re: [Elecraft] FIXED--was NOT the feedline

[rocketnj]

A layer of friction tape is also a good way to keep the connectors sticky free. 

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Josh Fiden
Sent: Wednesday, June 3, 2020 4:35 PM
To: Elecraft Reflector 
Subject: Re: [Elecraft] FIXED--was NOT the feedline

To make it come off *really* clean, I like to put the 1st layer of vinyl tape 
sticky side out. Then self-fusing tape, another layer of vinyl tape (3m 33+ or 
88). And because overkill is never enough, paint with some Scotchkote last!

73
Josh W6XU

Sent from my mobile device

>> On Jun 3, 2020, at 12:50 PM, Buck  wrote:
> Electrical tape, then the self-fusing tape, then electrical tape.  
> The first layer of electrical tape makes it easier to removing the 
> fusing tape later

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[Elecraft] KPA1500 PSU fan mod - Need resistor

[rocketnj]

Hi 

 

I emailed support over the weekend and have not heard back. Not sure if they
received the email or are backlogged in response due to COVID-19, so posting
here.

 

Looking for the resistor needed for mod to lower PSU fan speed on KPA1500
s/n 423

 

73

Dave wo2x

 

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Re: [Elecraft] KPA-1500 power supply fan noise

[rocketnj]

Hi Eric,

My 1500 is s/n 423. I do think the power supply fans are a bit loud in standby. 
Is my amp prior to the resistor change?
I have added the load resistor in the field and done the sample out mod for 
adaptive predistortion in the field also.

73
Dave wo2x



-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Eric Swartz WA6HHQ - Elecraft
Sent: Saturday, May 23, 2020 11:53 AM
To: Larry (K8UT) 
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 power supply fan noise

Hi Peter,

If the amp is on, there needs to be at least some PS fan activity at a low 
speed to cool the PS in idle. 

What s/n is your 1500? On later s/ns we changed a resistor in the ps fan 
circuit to slow them down a bit more. 

An alternative is to swap your ant 1 and 2 connections, putting the 6m ant on 
ANT 1. Then you can listen to 6m with the amp off. 

73,
Eric
elecraft.com
---
Sent from my iPhone 6S

> On May 23, 2020, at 8:10 AM, Larry (K8UT)  wrote:
> 
> Peter
> 
> I built a slightly longer cable to match the length of the control cable that 
> came with the amplifier (about 3 feet longer if I recall correctly).
> 
> This allows the PS to operate "remote" in a closet with the door closed.
> 
> -larry (K8UT)
> 
> -- Original Message --
> From: "Peter Dougherty" 
> To: Elecraft@mailman.qth.net
> Sent: 2020-05-23 10:33:19 AM
> Subject: [Elecraft] KPA-1500 power supply fan noise
> 
>> Is there any way to power off the fans (or lower their RPM) on the 
>> PSU if the amp is in standby mode?
>> 
>> I would like to keep my rig on 6m throughout the day during the Es season.
>> The problem is my 6m antenna is on antenna port 2 on the KPA, which 
>> requires the amp to be powered up. I only need to TX when a new grid 
>> pops up, but I do like to monitor the band during the day while I'm 
>> working. My XYL is working from home, and is in the same room for 
>> about 9 or 10 hours a day, and the noise after 10 minutes was too much for 
>> her. Any suggestions?
>> 
>> Please-n-thanks.
>> 
>> -
>> 73 and Good DX
>> Peter, W2IRT
>> 
>> 
>> 
>> President, North Jersey DX Association
>> 
>> DXCC Card Checker
>> Letter O Manager, ARRL Incoming 2nd District QSL bureau
>> 
>> 
>> 
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>> k...@charter.net
> 
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Re: [Elecraft] K1-4 low power and poor receive on 40 meters

[rocketnj]

Hi Don,

You nailed it. No output from the 15 MHz crystal. The other three bands are 
showing good output. I checked the relays K1 and K2 to verify each has pins 3 
to 4 conductivity when on 40 meters (set radio to 40 meters, power down, and 
remove filter board since relays are latching. One side of crystal checks good 
to ground and the other side checks good to P1 pin 4.

Ordered new 15 MHz crystal from Elecraft.

Thanks for the advice. Once I got the RF volt meter it took a few minutes to 
find the problem.

73 and thanks again!
Dave wo2x


-Original Message-
From: Don Wilhelm  
Sent: Wednesday, May 20, 2020 2:37 PM
To: rocke...@gmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K1-4 low power and poor receive on 40 meters

There is the possibility that the 40 meter crystal has low activity.
Check the RF voltage at pin 4 of P1 on the band board.  You should read 70mV or 
more with an RF Probe or 200mV+ peak to peak if using a 'scope with a 10X probe.

A good working K1 will develop at least 5 watts.
Make up an RF probe if you don't have one.  It does not have to be fancy, just 
stick the component leads through a piece of cardboard and solder the leads 
together.  You need a 1N34 diode (not a silicon diode) Elecraft does have a kit.

73,
Don W3FPR

On 5/20/2020 1:35 PM, rocke...@gmail.com wrote:
> Hi Don
>
> I have done that using the Marconi for RX, then touching up for TX. I 
> understand 40 is a combo of 30 & 40 settings. After carefully retuning (done 
> it several times) the best I can get on 40 is about 60 to 75 mW. 30 makes 
> better than 2 watts. The menu for power out is set to 2.0 on 40. Receive 
> sensitivity is 10 to 15 dB down from 30 meter receive.
>
> I read that the windings on T3 and T4 are critical. I have counted the 
> turns and verified which side #1,2,3 and 4 are coming off the core. 
> Both T3 and T4 appear to be fine. There is enough wire left over in 
> the box the radio was in so I can rewind T3 or T4. From what I see on 
> the schematic T4 would most likely be the suspect (if it is the 
> transformer.)
>
> I am going to borrow an RF Power meter with probe and check 30 vs 40 meter 
> readings on the Premix in & out and the RF filter in & out. That will greatly 
> help pinpoint the issue.
>
> 73
> Dave wo2x
>
>
> -Original Message-
> From: Don Wilhelm 
> Sent: Wednesday, May 20, 2020 11:39 AM
> To: rocke...@gmail.com; elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K1-4 low power and poor receive on 40 meters
>
> Dave,
>
> Refer to the K1FL4 instructions and re-tune the trimmers on the filter board. 
>  They MUST be done in the proper band sequence - 30 meters before 40m, 15m 
> before 20m.  The PreMixer portion is usually the most critical for power 
> output.
>
> 73,
> Don W3FPR
>
> On 5/20/2020 11:20 AM, rocke...@gmail.com wrote:
>> Hi All,
>>
>>
>>
>> I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of 
>> my Elmer. In testing the radio I found 40 meters is about 15dB less 
>> sensitivity than 30 and power out about 75 mW. I have double checked 
>> the values of components on the filter board to ensure they are 
>> correct and installed correctly. I also checked T3 and T4 which can 
>> cause issues on 40. T3 has 23 turns on the secondary with three turns 
>> on the primary. T4 has 24 turns on secondary and two turns on primary.
>> Another symptom is the CH trimmer cap seems to be at one end of tuning range 
>> (not seeing double peak).
>>
>>
>>
>> Note - the radio does not have the ATU option and 30 meters is set 
>> for
>> 10.1 MHz and not 10.0 (double checked crystals).
>>
>>
>>
>> >From what I can measure so far the relays seem to be working "as designed".
>> When I switch from 15 meters to 40 meters I can see the pulses to the 
>> relays to switch them (latching relays. I did notice in the 4 band 
>> filter manual it says K6 relay is not active on 40 but I do see it 
>> active and looking at the schematic K6 switches between 15/20 
>> operation and 30/40 so I think there is a typo in the filter board manual at 
>> the bottom of page 23.
>>
>>
>>
>> I am using a Marconi service monitor for testing. I have not built an 
>> RF probe yet and hoping someone has seen this symptom before. I would 
>> like to get the K1 fully operational as the proceeds are going to my 
>> Elmer's widow 100%
>>


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Re: [Elecraft] Elecraft Digest, Vol 193, Issue 35

[rocketnj]

That is fine for resonant antennas but I would like to monitor between the
amp and tuner.

I know the amp has a sample out port for adaptive predistortion. I had
changed the two small (very small) resistors on the filter board to adjust
the sample out level to work with an Anan radio with no attenuation. I
believe the new amps are shipping with this mod already done.

Too bad the sample out couldn't be used on the LP700...

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Warren Merkel
Sent: Wednesday, May 20, 2020 12:47 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft Digest, Vol 193, Issue 35

I definitely wouldn't bother to modify the KPA1500 to have a monitor loop!

I bought two sensors -- one between the K3 and the KPA1500, and the other
between the amplifer output and the antenna feedline.  The
LP500/LP700 supports up to four sensors.

This allows easy swapping from exciter output to amplifier output with a
button press, and allows amplifier linearity monitoring using the LP700.

Warren, KD4Z

On 5/20/2020 11:38 AM, elecraft-requ...@mailman.qth.net wrote:

> 
> I am thinking about adding a Telepost LP700 to my station but I would 
> need to insert it between the amp and tuner (which are integrated 
> together in the KPA1500).
> 
> Any ideas if it is worth doing something to loop the RF out of the amp 
> to the coupler and back in again? Probably no easy way to do it.
> 
>   
> 
> Just a thought.
> 
>   
> 
> Dave wo2x

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Re: [Elecraft] K1-4 low power and poor receive on 40 meters

[rocketnj]

Hi Don

I have done that using the Marconi for RX, then touching up for TX. I 
understand 40 is a combo of 30 & 40 settings. After carefully retuning (done it 
several times) the best I can get on 40 is about 60 to 75 mW. 30 makes better 
than 2 watts. The menu for power out is set to 2.0 on 40. Receive sensitivity 
is 10 to 15 dB down from 30 meter receive.

I read that the windings on T3 and T4 are critical. I have counted the turns 
and verified which side #1,2,3 and 4 are coming off the core. Both T3 and T4 
appear to be fine. There is enough wire left over in the box the radio was in 
so I can rewind T3 or T4. From what I see on the schematic T4 would most likely 
be the suspect (if it is the transformer.)

I am going to borrow an RF Power meter with probe and check 30 vs 40 meter 
readings on the Premix in & out and the RF filter in & out. That will greatly 
help pinpoint the issue.

73
Dave wo2x


-Original Message-
From: Don Wilhelm  
Sent: Wednesday, May 20, 2020 11:39 AM
To: rocke...@gmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K1-4 low power and poor receive on 40 meters

Dave,

Refer to the K1FL4 instructions and re-tune the trimmers on the filter board.  
They MUST be done in the proper band sequence - 30 meters before 40m, 15m 
before 20m.  The PreMixer portion is usually the most critical for power output.

73,
Don W3FPR

On 5/20/2020 11:20 AM, rocke...@gmail.com wrote:
> Hi All,
> 
>   
> 
> I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of my 
> Elmer. In testing the radio I found 40 meters is about 15dB less 
> sensitivity than 30 and power out about 75 mW. I have double checked 
> the values of components on the filter board to ensure they are 
> correct and installed correctly. I also checked T3 and T4 which can 
> cause issues on 40. T3 has 23 turns on the secondary with three turns 
> on the primary. T4 has 24 turns on secondary and two turns on primary. 
> Another symptom is the CH trimmer cap seems to be at one end of tuning range 
> (not seeing double peak).
> 
>   
> 
> Note - the radio does not have the ATU option and 30 meters is set for 
> 10.1 MHz and not 10.0 (double checked crystals).
> 
>   
> 
>>From what I can measure so far the relays seem to be working "as designed".
> When I switch from 15 meters to 40 meters I can see the pulses to the 
> relays to switch them (latching relays. I did notice in the 4 band 
> filter manual it says K6 relay is not active on 40 but I do see it 
> active and looking at the schematic K6 switches between 15/20 
> operation and 30/40 so I think there is a typo in the filter board manual at 
> the bottom of page 23.
> 
>   
> 
> I am using a Marconi service monitor for testing. I have not built an 
> RF probe yet and hoping someone has seen this symptom before. I would 
> like to get the K1 fully operational as the proceeds are going to my 
> Elmer's widow 100%
> 

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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[rocketnj]

Thanks Andy.

That is something to think about. Wouldn't be that hard. Have to check my 
purchase date to make sure it is out of warranty. 😊

Dave wo2x

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Andy Durbin
Sent: Wednesday, May 20, 2020 12:55 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

"It would seem to require an internal modification and two additional rear 
panel connectors."

FCC photos shows LPF RF Out is a BNC and tuner RF In is a BNC.Should be an 
easy mod if there is room on the rear panel for 2 BNC connectors.  Perhaps the 
LP-700 coupler would fit inside the LP1500 case?

Easy to speculate about mods to someone else's equipment.

73,
Andy, k3wyc

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[Elecraft] Looking to add LP700 to KPA1500 - ideas?

[rocketnj]

Hi All,

 

I am thinking about adding a Telepost LP700 to my station but I would need
to insert it between the amp and tuner (which are integrated together in the
KPA1500).

Any ideas if it is worth doing something to loop the RF out of the amp to
the coupler and back in again? Probably no easy way to do it.

 

Just a thought.

 

Dave wo2x

 

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[Elecraft] K1-4 low power and poor receive on 40 meters

[rocketnj]

Hi All,

 

I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of my
Elmer. In testing the radio I found 40 meters is about 15dB less sensitivity
than 30 and power out about 75 mW. I have double checked the values of
components on the filter board to ensure they are correct and installed
correctly. I also checked T3 and T4 which can cause issues on 40. T3 has 23
turns on the secondary with three turns on the primary. T4 has 24 turns on
secondary and two turns on primary. Another symptom is the CH trimmer cap
seems to be at one end of tuning range (not seeing double peak).

 

Note - the radio does not have the ATU option and 30 meters is set for 10.1
MHz and not 10.0 (double checked crystals).

 

>From what I can measure so far the relays seem to be working "as designed".
When I switch from 15 meters to 40 meters I can see the pulses to the relays
to switch them (latching relays. I did notice in the 4 band filter manual it
says K6 relay is not active on 40 but I do see it active and looking at the
schematic K6 switches between 15/20 operation and 30/40 so I think there is
a typo in the filter board manual at the bottom of page 23.

 

I am using a Marconi service monitor for testing. I have not built an RF
probe yet and hoping someone has seen this symptom before. I would like to
get the K1 fully operational as the proceeds are going to my Elmer's widow
100%

 

Thanks for reading!

 

Dave wo2x

 

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Re: [Elecraft] KPA1500 and noise

[rocketnj]

Need more details on what your antenna system is and especially what is
connected to antenna 1 and 2 on the amp.
Any antenna switches, etc.

Dave wo2x



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of w5...@comcast.net
Sent: Friday, May 8, 2020 8:28 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 and noise

Recently I have noticed that I have a very high noise lever at my QTH, which
I have never had.  Today as I was shutting down my station I turned off the
KPA1500 first, and my noise dropped from S7 to S1 instantly.

I turned the Amp back on and the noise came back.  Have any of you ever
observed this?

Thanks in advance

Ronnie W5SUM 

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Re: [Elecraft] A broken K3

[rocketnj]

Great news Dave! 
Your brother will be happy to get back on the air.

Tech support from Elecraft and the users on this group is excellent. Lots of 
knowledge that they are willing to share.

Dave wo2x

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of David Olean
Sent: Thursday, March 26, 2020 11:17 PM
To: Elecraft Reflector 
Subject: [Elecraft] A broken K3

Hello again

I finally sorted out the problem with my brother , K0ZK's Elecraft K3. 
It was an oldie with a serial number in the 300s and it died on him in the 
middle of a QSO. It has been dead for about six months and he is not in the 
best of health, so I figured I would try to fix it for him. Elecraft Tech 
Support came through even with all of the Virus conditions rocking the entire 
economy. Symptoms were no TX or RX, but everything seemed to be working as 
relays clicked as you changed bands, and the dial indications seemed OK. I 
traced the problem to a missing synthesizer signal to the first mixer and also 
the 2nd mixer on TX.  I tried swapping out the synthesizer, but had no luck as 
the 2nd synthesizer did not work either.  With the expert help and advice from 
Tech Support I found that my synthesizer was missing the 8 VDC on one of the 
connector pins. Checking the 8 volt rail, the resistance to ground seemed OK, 
so I removed the 8 V regulator and supplied 8 volts from an external current 
regulated power supply.  It pulled about 230 ma at 8 volts. The K3 t
 ook off and started working again with 8 volts supplied. 
I had to do another synthesizer CAL, but after doing that, the rig is good to 
go on all bands.

I was hoping that I had a new 8 volt regulator in my junque box. After an 
exhaustive search I found everything BUT and 8 volt regulator, so I will have 
to order one. I'll also get some upgrade kits from Elecraft to bring K3 #387 
into the 21st century. Gold pins are on top of the list.

Thanks for the excellent tech support help, Elecraft!

73

Dave K1WHS

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Re: [Elecraft] Ivory Coast DXpedition

[rocketnj]

Thanks. Got them first call.

Dave wo2x


On 2/22/2020 1:46 PM, Lyn Norstad wrote:
> TU5PCT Czech DXpedition to the Ivory Coast is burning up 20 meters FT8 
> this afternoon on multiple stations.
>
>   
>
>    https://www.cdxp.cz/
>
>   
>
> 73
>
> Lyn, WØLEN
>
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Re: [Elecraft] KPA1500

[rocketnj]

Sounds like an issue with the power detection circuit on the filter board. I 
had the 3 watt resistor unsolder itself from the board (it is mounted upside 
down so gravity helped). I had all kinds of weird power reading issues that 
were impossible for the input power and current draw.

I suggest calling Elecraft before doing anything else as you can cause more 
damage continuing the transmit. Elecraft was excellent in diagnosing my problem 
and sent me the necessary parts to repair it in the field (I did work in 
electronics, so familiar with surface mount work)


Dave wo2x



-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Rick Bates, NK7I
Sent: Thursday, February 20, 2020 2:23 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500

Presuming that is a known 'good' dummy load for that power level, have you run 
the output calibration of the driver radio (K3/S also presumed) as a starting 
point?

If that has been done (successfully, multiple times), check to make SURE that 
the radio (driver) antenna tuner is BYPASSED (not presenting an odd load into 
the amp).

Watch CAREFULLY that the driver output is constant (no dirty control, no spike 
etc.).

Then it's time to be concerned about the 80M tuned input circuit failing on the 
KPA1500 and call Elecraft for specific tests.  When the amp sees
 >=19 watts input, it wigs out, badly.  (But the extreme outputs ARE 
 >impressive; it's nice to have overhead at legal limit).

GL, please let us know how it was resolved, Rick NK7I


On 2/19/2020 9:10 PM, Ed gilliland wrote:
> Hello Everyone,
>
> I'm getting the following error codes on 80 meters, 160 and 40 are 
> working.
>
> I suspected the 80m antenna so I tried using a dummy load and I get 
> the same error codes.  Reducing the input power does not help.
>
> I've reloaded firmware 2.38.
>
> Anyone run into this problem?
>
> Ed W5TM
>
>
> 918 20-02-19T23:00:11 OVR 61 - LOW GAIN  freq 3544 inp 10W 36A 21C adc
> 222 power ratio 0
> 917 20-02-19T22:59:55 OVR 61 - LOW GAIN  freq 3544 inp 14W 43A 21C adc
> 275 power ratio 0
> 916 20-02-19T22:59:31 FLT B0 - PWR DISS  freq 3544 inp 14W 44A 20C pwr 
> dissipated 2313W
> 915 20-02-19T22:59:31 OVR 61 - LOW GAIN  freq 3536 inp 14W 43A 20C adc
> 274 power ratio 0
> 914 20-02-19T22:58:40 FLT B0 - PWR DISS  freq 3536 inp 19W 51A 20C pwr 
> dissipated 2676W
> 913 20-02-19T22:58:40 OVR 61 - LOW GAIN  freq 3536 inp 19W 51A 20C adc
> 330 power ratio 0
> 912 20-02-19T22:55:01 ON  00 - ON  3 times firmware version 02.38
> 911 20-02-19T22:39:38 FLT 61 - LOW GAIN  freq 3536 inp 10W 36A 23C adc
> 223 power ratio 0
> 910 20-02-19T22:39:38 OVR 61 - LOW GAIN  freq 3544 inp 10W 36A 23C adc
> 222
> 918 20-02-19T23:00:11 OVR 61 - LOW GAIN  freq 3544 inp 10W 36A 21C adc
> 222 power ratio 0
> 917 20-02-19T22:59:55 OVR 61 - LOW GAIN  freq 3544 inp 14W 43A 21C adc
> 275 power ratio 0
> 916 20-02-19T22:59:31 FLT B0 - PWR DISS  freq 3544 inp 14W 44A 20C pwr 
> dissipated 2313W
> 915 20-02-19T22:59:31 OVR 61 - LOW GAIN  freq 3536 inp 14W 43A 20C adc
> 274 power ratio 0
> 914 20-02-19T22:58:40 FLT B0 - PWR DISS  freq 3536 inp 19W 51A 20C pwr 
> dissipated 2676W
> 913 20-02-19T22:58:40 OVR 61 - LOW GAIN  freq 3536 inp 19W 51A 20C adc
> 330 power ratio 0
> 912 20-02-19T22:55:01 ON  00 - ON  3 times firmware version 02.38
> 911 20-02-19T22:39:38 FLT 61 - LOW GAIN  freq 3536 inp 10W 36A 23C adc
> 223 power ratio 0
> 910 20-02-19T22:39:38 OVR 61 - LOW GAIN  freq 3544 inp 10W 36A 23C adc
> 222
>
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Re: [Elecraft] Unexpected K-POD frequency excursions

[rocketnj]

Peter, 

Contact Elecraft support on this issue. Sounds like poor grounding/ESD
protection. They may have a service bulletin to fix the issue.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Peter Dougherty
Sent: Sunday, November 24, 2019 11:56 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Unexpected K-POD frequency excursions

Hi all,
In CQWW this weekend I ran across a problem that's been plaguing me in
previous contests too. With the K-pod connected to the radio (K3s) using the
supplied cable I'm finding that the main VFO QSYs down about 100-200 Hz on a
random basis. I tried loading the flat cable up with Mix 31 ferrites to no
effect. I haven't thoroughly tested this on all bands, but it definitely
occurred on 20 through 160. It was not a regular occurrence; maybe every 2-3
minutes it would happen. When I engage the VFO lock on the front panel of
the radio it stops doing it.

I has also been know to shut the radio off once every few days when I touch
the K-pod, which I'm attributing to static electricity. While I love the
functionality of my K-pod, I had to take it offline due to the frequency
excursions. I'd like to get a fix for this if at all possible. Suggestions?

 


-
73 and Good DX
Peter, W2IRT



President, North Jersey DX Association

DXCC Card Checker
Letter O Manager, ARRL Incoming 2nd District QSL bureau

 

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Re: [Elecraft] Reflected power

[rocketnj]

Check your connections. Loose or poor PL-259s. Also check to see if the
antenna is close to something causing it to arc over. I had one antenna that
used ladder line with solid conductors. Due to it moving around in the wind
one of the conductors developed a break which tested fine under low power or
with an analyzer but would have problems at higher power. I've since moved
to Davis RF copper clad stranded ladder line.

Dave wo2x




-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Stephen Rabinowitz
Sent: Sunday, September 15, 2019 7:58 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Reflected power

My KPA-1500 switches from operate to standby due to reflected power more
than 200w whenever drive power exceeds about 8 watts on 7 MHz. The forward
power at that point is about 400w. The antenna is a double bazooka that
shows an SWR of about 1.2 on a RigExpert AA-230Pro antenna analyzer. A
Telepost LP-100A digital wattmeter shows SWR 1.3 with Z=52, R=49, Ph=17, and
X=15. The KP1500 tunes to an SWR of what it labels 1.1 on that frequency.
The latest firmware, version 2.27 is installed. This problem does not occur
with double bazooka antennas on 80m or 30m, or with Yagis from 20m to 6m. It
seems to me that there is a brief surge in reflected power at the very onset
of the transmission that triggers the response, but that the reflected power
quickly decreases to normal levels of just a few watts. Any ideas for
dealing with this problem would be much appreciated.
73, Steve K2SN

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Re: [Elecraft] KPA 500 Attenuated Receive Signals

[rocketnj]

I had the issue with my 1500 several months ago and it was traced to one of
the PIN diodes. Good news is after trip to the left coast for repair and all
ECO updates applied the amp has been perfect.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Barry Simpson
Sent: Sunday, September 8, 2019 8:22 AM
To: donw...@embarqmail.com
Cc: Elecraft Mailing List 
Subject: Re: [Elecraft] KPA 500 Attenuated Receive Signals

Thanks Don
That's what I thought. I will email them tomorrow.

73

Barry  VK2BJ

On Sun, 8 Sep 2019 at 21:36, Don Wilhelm  wrote:

> Barry,
>
> I think you may find a problem in the KPA500 T/R switch area.
> Email supp...@elecraft.com for further checks and resolution.
>
> 73,
> Don W3FPR
>
> On 9/8/2019 2:34 AM, Barry Simpson wrote:
> > My KPA 500, which is several years old, has just developed an issue 
> > which so far I have been unable to resolve.
> >
> > What has happened is that when I put the amplifier into OPER, the
> received
> > signal strength drops by several S units. It transmits normally and 
> > also receives normally in STBY.
> >
>
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Re: [Elecraft] KPA 1500 Remote Program V1.27

[rocketnj]

What I would like to see is ability to control amp from a smartphone, either
native app or a web page via login/password. I've been working on the latter
using a Raspberry Pi in the shack talking to the amp via Ethernet. It acts
as a web server. I have the telemetry working now and next step is the
control logic (on/off, oper/stby, fan speed increase/decrease, etc).

See attached picture. This is from a web browser.

Dave wo2x




-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Burl Borcherding
Sent: Tuesday, July 2, 2019 10:18 AM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KPA 1500 Remote Program V1.27

The new software release V1.27 (6/21/19) will now allow WAN connections to
your KPA 1500 for true remote operations.  You can now get rid of the extra
devices and or computer to control you KPA1500 remotely outside your LAN.
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Re: [Elecraft] K4 Field Day report

[rocketnj]

And if memory serves, it was around 08:30 Eastern yesterday on 14.080

Dave wo2x


-Original Message-
From: WW3S  
Sent: Monday, June 24, 2019 5:03 PM
To: Dave 
Cc: David Gilbert ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K4 Field Day report

PIE or MIE ? I was at W3MIE, IC-7300, very little ALC deflection, but would
sure like to know if it was us

Sent from my iPad

> On Jun 24, 2019, at 4:05 PM, Dave  wrote:
> 
> W3PIE on 14.080 FT8 was splattering prettybad yesterday morning. Spikes up
and down the passband. Surely an overdrive issue with audio levels.
> 
> Dave wo2x
> 
> Sent from my iPad
> 
>> On Jun 24, 2019, at 3:09 PM, David Gilbert 
wrote:
>> 
>> 
>> There isn't a rig on the planet that will take out actual splatter,
although you MIGHT be able to filter out some of it at audio depending upon
the offender's voice characteristics.  If the trash is truly within your
passband at RF you are going to hear it.
>> 
>> Most of that occurs due to sheer ignorance on the part of the operator,
but the sad thing is that there are hams out there who will intentionally
overdrive their rigs in order to create "elbow room" for themselves.  On CW
they do it with fast rise times to generate key clicks.  I've seen posts
from guys who admit doing it.
>> 
>> 73,
>> Dave   AB7E
>> 
>> 
>>> On 6/24/2019 11:44 AM, Mark Goldberg wrote:
>>> I'd be interested to hear how it does in the presence of close in 
>>> strong signals, especially SSB. I was operating a KX3 on SSB in 
>>> close frequency to someone that was far away, but they had all the 
>>> knobs up to 11 and was maybe S9+20 and about 10 kHz wide with lots 
>>> of splatter. I could hear anyone that came back to me but I 
>>> eventually abandoned the frequency because most could not hear me. 
>>> 20 SSB was wall to wall with someone about every 1.5 kHz or closer.
>>> 
>>> 73,
>>> 
>>> Mark
>> 
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Re: [Elecraft] K4 Field Day report

[rocketnj]

Definitely W3PIE

I kept sending W3PIE CK LEVELS but guess they didn't know what they were
looking at. You could see the spikes across their whole TX passband and
noise floor rise.

Dave wo2x

-Original Message-
From: WW3S  
Sent: Monday, June 24, 2019 5:03 PM
To: Dave 
Cc: David Gilbert ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K4 Field Day report

PIE or MIE ? I was at W3MIE, IC-7300, very little ALC deflection, but would
sure like to know if it was us

Sent from my iPad

> On Jun 24, 2019, at 4:05 PM, Dave  wrote:
> 
> W3PIE on 14.080 FT8 was splattering prettybad yesterday morning. Spikes up
and down the passband. Surely an overdrive issue with audio levels.
> 
> Dave wo2x
> 
> Sent from my iPad
> 
>> On Jun 24, 2019, at 3:09 PM, David Gilbert 
wrote:
>> 
>> 
>> There isn't a rig on the planet that will take out actual splatter,
although you MIGHT be able to filter out some of it at audio depending upon
the offender's voice characteristics.  If the trash is truly within your
passband at RF you are going to hear it.
>> 
>> Most of that occurs due to sheer ignorance on the part of the operator,
but the sad thing is that there are hams out there who will intentionally
overdrive their rigs in order to create "elbow room" for themselves.  On CW
they do it with fast rise times to generate key clicks.  I've seen posts
from guys who admit doing it.
>> 
>> 73,
>> Dave   AB7E
>> 
>> 
>>> On 6/24/2019 11:44 AM, Mark Goldberg wrote:
>>> I'd be interested to hear how it does in the presence of close in 
>>> strong signals, especially SSB. I was operating a KX3 on SSB in 
>>> close frequency to someone that was far away, but they had all the 
>>> knobs up to 11 and was maybe S9+20 and about 10 kHz wide with lots 
>>> of splatter. I could hear anyone that came back to me but I 
>>> eventually abandoned the frequency because most could not hear me. 
>>> 20 SSB was wall to wall with someone about every 1.5 kHz or closer.
>>> 
>>> 73,
>>> 
>>> Mark
>> 
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Re: [Elecraft] KPA-1500 input too high

[rocketnj]

Hi Andy

I am thinking the reactance the antenna presents to the tuner may have
something to do with it. Even though SWR shows about 3.7:1 it may well do
with causing the issue.
At 3.636 the capacitance is 719 and inductance is 2100.
The only band I need a tuner is 80 meters. All other bands are resonant (I
do not operate 160)

I've opened a service request on the web site as well as following up with a
detailed email to support along with operating conditions and log file.

The amp will need to visit home to get repaired and updated. Another KPA1500
user with s/n close to mine just got his back from repair and there were a
few updates done to his that are definitely not done to mine.

Dave wo2x



-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Andy Durbin
Sent: Monday, April 29, 2019 7:53 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA-1500 input too high

Was the KPA1500 tested at maximum output power and duty cycle with a loading
condition that required drive power to be just below the level that would
trip the "input power too high"  monitor?

Is it possible that certain loading conditions would require a drive power
level high enough to overheat the input resistor?

73,
Andy, k3wyc




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Re: [Elecraft] KPA-1500 input too high

[rocketnj]

The input too high only happens into a non-resonant load (tuner in circuit).
Also noticed on 20 now when tuner is in operate there is a 3 dB drop in
noise floor.

This is the second time the 3 watt resistor has desoldered itself from the
board and both times the resistor is discolored.

Only one RF path from radios through switching into amp input. Amp output
feeds a 1x4 antenna switch. No other radios transmitting in near proximity.

Definitely something failed on filter board.

Dave wo2x


-Original Message-
From: Paul Baldock  
Sent: Saturday, April 27, 2019 6:21 PM
To: rocke...@gmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 input too high

Try it in to a dummy load.

- Paul

At 02:48 PM 4/27/2019, rocke...@gmail.com wrote:
>Hi All,
>
>
>
>KPA-1500 s/n 423
>
>
>
>Operating 80 meter SSB running 20 watts drive with tuner engaged for 
>about
>1240 watts out PEP. Remote app shows maximum power handling of 1620 watts.
>
>Out of nowhere I got an input power too high alarm @ 191 watts! The 
>radio is capable of 100 watts out max and verified is set to 20 watts.
>
>
>
>Set tune power to 10 watts.
>
>Meter in amp during standby reads 10 watts.
>
>Switch to operate and immediately get input power too high alarm @ 91
watts.
>
>
>
>Switch to 20 meters (resonant antenna). No issue - 10 watts tune is 
>approximately 400 watts out with no error.
>
>
>
>Any ideas?
>
>
>
>Dave wo2x
>
>
>
>
>
>
>
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Re: [Elecraft] KPA-1500 input too high

[rocketnj]

Don, first thing I did. Radio is indeed sending 20 watts on 80 meters. Is a 
Flex 6600, not capable of 191 watts the amp said it was seeing.

The 3 watt, 3k Ohm resistor on the filter board is discolored and one side 
desoldered itself. This provides RF to the onboard frequency counter. This is 
the second time in three months that resistor has been an issue. Last time it 
was discolored and fell off the board (mounted upside down).

This time it appears to be more involved than just the 3 watt resistor.

Dave wo2x


-Original Message-
From: Don Wilhelm  
Sent: Saturday, April 27, 2019 6:08 PM
To: rocke...@gmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 input too high

What are you using to drive the KPA1500?

Connect the driving transceiver to an external wattmeter, and then to a dummy 
load.  Do a KeyDown in CW mode and see what the actual power output is shown on 
the external wattmeter.

My thinking is that your driving transceiver has lost its ability to control 
the power output.  Do the test with an external wattmeter and a dummy load 
rather than depending on the power indications from either the KPA1500 or the 
driving transceiver.  In other words, check each piece of gear one piece at a 
time.

73,
Don W3FPR

On 4/27/2019 5:48 PM, rocke...@gmail.com wrote:
> Hi All,
> 
>   
> 
> KPA-1500 s/n 423
> 
>   
> 
> Operating 80 meter SSB running 20 watts drive with tuner engaged for about
> 1240 watts out PEP. Remote app shows maximum power handling of 1620 watts.
> 
> Out of nowhere I got an input power too high alarm @ 191 watts! The radio is
> capable of 100 watts out max and verified is set to 20 watts.
> 
>   
> 
> Set tune power to 10 watts.
> 
> Meter in amp during standby reads 10 watts.
> 
> Switch to operate and immediately get input power too high alarm @ 91 watts.
> 
>   
> 
> Switch to 20 meters (resonant antenna). No issue - 10 watts tune is
> approximately 400 watts out with no error.
> 
>   
> 
> Any ideas?
> 
>   
> 
> Dave wo2x
> 
>   
> 
>   
> 
>   
> 
> __
> Elecraft mailing list
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[Elecraft] KPA-1500 input too high

[rocketnj]

Hi All,

 

KPA-1500 s/n 423

 

Operating 80 meter SSB running 20 watts drive with tuner engaged for about
1240 watts out PEP. Remote app shows maximum power handling of 1620 watts.

Out of nowhere I got an input power too high alarm @ 191 watts! The radio is
capable of 100 watts out max and verified is set to 20 watts.

 

Set tune power to 10 watts.

Meter in amp during standby reads 10 watts. 

Switch to operate and immediately get input power too high alarm @ 91 watts.

 

Switch to 20 meters (resonant antenna). No issue - 10 watts tune is
approximately 400 watts out with no error.

 

Any ideas?

 

Dave wo2x

 

 

 

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Re: [Elecraft] Sending AFSK RTTY--FIXED

[rocketnj]

Pete,

YouCAN share the CAT connection from the K3S USB via a program called VSPE. 
Works very well.
Give me a call tomorrow to discuss.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Peter Dougherty
Sent: Thursday, March 21, 2019 7:00 PM
To: 'Joe Subich, W4TV' ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Sending AFSK RTTY--FIXED

Yes, you're right, and I will miss the ability to have multiple CAT 
connections...that's a biggie and the ability to mute the mic on .wav playback 
as well. I should have said that I have (almost) all the functionality that I 
had before for the features that I use. At this point, I'm trying to simplify 
things for the next couple of months, get things working reliably, then 
introduce an SDRPlay, Skimmer, and Win4K3 after Dayton. 

I do miss the Winkeyer's speed control knob, but I can get used to just using 
N1MM PageUp/Dn keyboard commands or the K3s's front panel control knob. I had a 
great run with the MK and MK-II over the years and yeah, there are a few things 
I'll miss, for sure, but the reduced complexity--both physical and software/PC 
related, and reduced potential for RF ingress are substantial positives as 
well. 

 - pjd

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Joe Subich, W4TV
Sent: Thursday, March 21, 2019 3:52 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Sending AFSK RTTY--FIXED

On 2019-03-21 1:52 PM, Peter Dougherty wrote:
 > Again, a big thank you to everybody who lent a hand to this. One final  > 
 > question, does the USB audio connection from the K3s separate out the  > 
 > main and sub receiver audio in the same manner as using a physical  > audio 
 > breakout cable two and 3.5mm plugs?

Yes, the K3/KIO3B or K3S USB Audio CODEC behaves exactly like the K3 with 
analog Line In/Line Out.  The USB Audio CODEC is essentially "grafted on" to 
the Line In/Line Out.  In fact "Speaker (USB AUDIO CODEC)" is connected in 
parallel with the analog Line Out jack.

Please refer to the K3S Owners Manual and the K3S schematic package on-line.

> I seem to have all the functionality I had previously with the
 > MicroKeyer-II in line

Not by a long shot ... you no longer have a hardware based FSK, a K1EL WinKey 
keyer, support for multiple CAT connections (for syncing an external SDR 
panadapter), the ability to mute the microphone when playing an SSB voice file, 
access to dedicated CI-V and/or SteppIR control channel, etc.  While you may 
not have used all those features you certainly do not have the same 
functionality as you had with the microKEYER II.

73,

... Joe, W4TV


On 2019-03-21 1:52 PM, Peter Dougherty wrote:
> Hi all,
> Just a quick note to thank everybody here for their suggestions and help. 
> There were some things in the K3s that needed to be changed, but that 
> still left some serious issues that were definitely related to DX Labs 
> WinWarbler.
>
> DX Labs works by storing app settings in the registry, and the 
> registry settings for all related apps are stored in a “workspace.”
> Somehow the settings for WinWarbler had gotten corrupted. On a whim, I 
> restored an old known-good workspace, changed the parameters to the 
> new hardware configuration and after a couple of bumpy starts, everything 
> worked fine.
> I saved a new workspace with these settings, and then I went back to 
> the original profile, and it remained screwed up. Once again I shut 
> everything down, loaded the new profile that I’d just created and it’s 
> all good. The bad profile has now been deleted off the system and all 
> is once again right.
>
> I would definitely like to thank Barry, K3NDM for helping me out 
> one-on-one, ironing out the needed K3s settings, and getting RTTY 
> working in FLDIGI and N1MM (proving this was a DX Labs problem).
>
> FOUR DAYS to get this done, but at least now, with very limited 
> testing, I seem to have all the functionality I had previously with 
> the MicroKeyer-II in line—but without the extra cabling, risk of RF 
> ingress, and multiple virtual COM ports.
>
> Again, a big thank you to everybody who lent a hand to this. One final 
> question, does the USB audio connection from the K3s separate out the 
> main and sub receiver audio in the same manner as using a physical 
> audio breakout cable two and 3.5mm plugs? I would like to have a 
> second instance of MMTTY set up to receive the sub RX audio, with the 
> primary using only the main VFO. I used to be able to accomplish this 
> using left- and right-channels in the MMTTY setup, but that doesn’t 
> seem to work using USB. Not a major issue now that FT8 Dxpedition Mode 
> seems to be all the rage, but I would still like to have this functionality 
> if possible.
>
>
>
> - pjd
>

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Re: [Elecraft] KPA-1500 failed!

[rocketnj]

I talked to Peter on the phone. He has no bias current when amp is transmitting 
with no power applied (key on SSB without talking. He is reading 54 volts and 
has tried power cycling amp from power supply switch and reseated all cables. 
Definitely BAD distortion on SSB (we are close enough to hear each other). 
Looks like one RF device let loose and it is dragging down the bias voltage. 
That is my guess.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Wes
Sent: Saturday, February 16, 2019 9:49 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 failed!

I think a two-tone test is the best evaluation tool..  The generator is built 
into the K3 if you have another receiver that you can use to listen to the amp 
output.  I use an SDR-IQ which is a very nice tool for this but any other SDR 
would do.

Sorry for your pain.

Wes  N7WS

On 2/16/2019 7:28 AM, li...@w2irt.net wrote:
> I was operating in the ARRL-CW contest this morning and on 20m, with a 
> 1.2:1 SWR on the Yagi, all of a sudden I saw my power drop to about 
> 450-500W with about 40W in. Worked a few stations but not as easily as 
> when I turned everything on this morning. Switched over to phone and made a 
> few contacts.
> Audio is fine barefoot with 100W out of the K3s-which suffered blown 
> finals itself during CQWW SSB last fall, but with the amp in I got 
> reports that my audio was badly distorted.
>
> Before I send it in, is there anything I should look at or any 
> diagnostics I can easily perform? For the cost of this, I'd have 
> thought protection would have kicked in to prevent anything untoward 
> from happening. I'm in complete disbelief, to be honest.
>
> -
> 73 and Good DX
> Peter, W2IRT
>

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Re: [Elecraft] KPA1500 vs SPE Amps

[rocketnj]

I have had the SPE 1.3k and now have the KPA1500. I drive them with a Flex 6600 
and Anan 7000dle. 

The issue I had with the SPE 1.3k was once you start pushing it past 1 KW out 
the TX IMD starts to really get bad. This is due to the single LDMOS RF device 
being pushed towards its limit. The other issue I had with the SPE is heat 
dissipation on long SSB transmissions and digital transmissions. The fans would 
ramp up very quickly and were more noise than I wanted in the shack. As it 
heated up the power would drop off high to mid power.

The KPA1500 fans will still spin up faster with long transmissions or during 
digital operation but the power supply unit can be located under the desk, 
reducing some of the noise. Also the fan profile is such that they can be set 
to have the PA deck turn off or be set to one of five levels. If the temp 
increases past a certain point the fans will increase.

The other thing is the tuner on the KPA1500 is MUCH better than the SPE 1.3k. 
The SPE amp would not tune my G5RV on 80. The KPA1500 tunes it, although on one 
end of the band at reduced power (1200 watts). So the tuning range on the 
KPA1500 is superior.

I'm happy I spent the additional money on the KPA1500.

Dave wo2x




-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Dave
Sent: Tuesday, February 12, 2019 1:45 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 vs SPE Amps

Has anyone had experience with both the KPA1500 and any of the current (1.3K, 
1.5K or 2K) Expert Linears  from SPE? I was initially leaning towards the 
1.3K-FA without the ATU. The more I thought about it, the more I wanted to go 
with an ATU. The price difference to get less than 1db in going from 1300 watts 
to 1500 was also a bit of a concern. However, I’ve never pushed my 3x8874s to 
more than 1200 and only on the low bands. I have a KPA500 with the KAT500 and 
it’s great. However, in a 160 pileup a bit more power would help. Changing 
bands quickly is awesome. That has me leaning towards the KPA1500. If anyone 
would like to share their thoughts, it would be greatly appreciated.

Also, I’m wondering if anyone has run their KPA500 and a KPA1500 off of the 
same K3? If so, how did you set it up?

Tnx es 73,
Dave N8AG

Sent from Mail for Windows 10

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[Elecraft] KPA1500 loose 3K Ohm/3 watt resistor

[rocketnj]

Hi All

 

Went to move the amp today and heard something loose in the PA deck on the
KPA1500. I removed the bottom cover to find a 3 K Ohm, 3 watt resistor
laying loose to the side of the PA board. There is indication that the
resistor has been heated. Checking the resistor with my Fluke 77 shows it is
still within tolerance.

Any ideas where this goes on the board? (PA/Filter/other)?

 

I've looked at the boards and cannot see where it came off. I also looked at
the pictures Elecraft submitted to the FCC and they do not show it.

 

Here's a link of a picture of the resistor.

https://photos.app.goo.gl/u5tcd2kQa2GJaLd19

 

Hoping someone can answer this in case Elecraft is off tomorrow for MLK Jr.
Holiday.

 

73

Dave wo2x

 

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Re: [Elecraft] KPA1500 Required Update????

[rocketnj]

It was sent to the email address I gave them when I ordered my amp.
Check your spam filters.

I forwarded the email to you.

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Alan Sewell N5NA
Sent: Saturday, January 5, 2019 6:17 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Required Update

Where was the email about the important/required KPA1500 update posted?

The first I heard about it was Rich's KUDOS reflector post.  I've gone back 
through my reflector digests and emails and haven't found any announcement 
about the update.

BTW, I just updated to version 2 with no problems.

73, Alan N5NA

On 1/5/2019 4:02 PM, elecraft-requ...@mailman.qth.net wrote:
> Message: 13
> Date: Sat, 5 Jan 2019 13:44:34 + (UTC)
> From: Rich Yost
> To:elecraft@mailman.qth.net
> Subject: [Elecraft] Tech Support --- kpa1500  KUDOS 
> Message-ID:<344994338.6610277.1546695874...@mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> Well, I saw the email Thursday night about the Important firmware 
> update for the
> kpa1500 v2.0
> So I applied it after updating the utility program first when I got home from 
> work on Friday.
>
> Going well, till it failed and then hung.
> Yes - I freaked out, I know what bad things happen when firmware 
> updates go bad (aka iPhone)

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