Re: [Elecraft] KPA-1500 power reading ?

[Ron Manfredi]

I see something similar with my (non-Elecraft) amp.  The amp's display 
matches a Bird 43 I had connected with a 12 inch cable from the amp and 
then goes into an accurate 50 Ohm  dummy load. I usually do not leave 
the Bird in-line, but had this set up for testing the amp when I first 
got it.


The remote LP100 sensor I have is actually on a cable that is about 3 
feet from the amp and it usually reads HIGHER than the amp does, even 
into the same dummy load.


Ron   WA2EIO


On 2/5/2021 10:48 PM, Bill Johnson wrote:

I accept differences do to cable lengths and different points of monitoring.  No two 
will ever be the same when sampling rf at different points.  Unless all connections 
and cables are perfectly perfect "-)

Bill
K9YEQ

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Ed Stallman
Sent: Friday, February 5, 2021 12:23 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KPA-1500 power reading ?

The KPA1500 is new to me and very happy with my purchase . I'm using the 
LP-100A watt meter and comparing it with the KPA-1500 they both read close 
enough 10 to 160 . On 6m I'm seeing a bigger spread  with the LP-100A reading 
1500w the KPA-1500 is showing 1375w . If you look at this in DB , it's nothing. 
I know the LP-100A is very accurate and the only way to know for sure is to 
have Larry at Telepost test it. Most likely wont do wont do that. Are their 
others that see a difference on 6m ?

Thanks Ed N5DG


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Re: [Elecraft] KPA-1500 power reading ?

[Bill Johnson]

I accept differences do to cable lengths and different points of monitoring.  
No two will ever be the same when sampling rf at different points.  Unless all 
connections and cables are perfectly perfect "-)

Bill
K9YEQ

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Ed Stallman
Sent: Friday, February 5, 2021 12:23 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KPA-1500 power reading ?

The KPA1500 is new to me and very happy with my purchase . I'm using the 
LP-100A watt meter and comparing it with the KPA-1500 they both read close 
enough 10 to 160 . On 6m I'm seeing a bigger spread  with the LP-100A reading 
1500w the KPA-1500 is showing 1375w . If you look at this in DB , it's nothing. 
I know the LP-100A is very accurate and the only way to know for sure is to 
have Larry at Telepost test it. Most likely wont do wont do that. Are their 
others that see a difference on 6m ?

Thanks Ed N5DG


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[Elecraft] KPA1500 power reading

[Bob McGraw]

If my memory serves me correctly, power calibration is done band by 
band.  I suggest you calibrate the amp PWR ADJ to agree with your LP=100 
for each band.   Be sure to use a 50 dummy load and NOT an antenna.


73

Bob, K4TAX


Message: 17
Date: Fri, 5 Feb 2021 16:06:10 -0700 (MST)
From: Lou W0FK
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 power reading ?
Message-ID:<1612566370706-0.p...@n2.nabble.com>
Content-Type: text/plain; charset=UTF-8

Ed Stallman-2 wrote


The KPA1500 is new to me and very happy with my purchase . I'm using the
LP-100A watt meter and comparing it with the KPA-1500 they both read
close enough 10 to 160 . On 6m I'm seeing a bigger spread? with the
LP-100A reading 1500w the KPA-1500 is showing 1375w . If you look at
this in DB , it's nothing. I know the LP-100A is very accurate and the
only way to know for sure is to have Larry at Telepost test it. Most
likely wont do wont do that. Are their others that see a difference on 6m
?

Thanks Ed N5DG


I have the same setup Ed (KPA1500/LPA-100A). I've always seen a difference,
and never really paid much attention to it. When I read your email I ran
some very quick and dirty tests, here's what I'm seeing:

80M:  LPA -- 1322, KPA1500 -- 1513
40M:  LPA -- 1325, KPA1500 -- 1504
 6M:   LPA -- 1345, KPA1500 -- 1550

Pretty consistent with your 6M readings. Are you seeing much closer numbers
than mine?

73, Lou W0FK

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Re: [Elecraft] KPA-1500 power reading ?

[Ed Stallman]

Jim, using 4ft of low loss Davis RF Bury Flex between LPA and KPA , 6m 
is the one band with the biggest difference , KPA1500 reading 125 to 150 
watts less . I've decided with the LP-100A in better line of site , I'm 
going with it .


Ed N5DG

On 2/5/2021 6:52 PM, Jim Brown wrote:

On 2/5/2021 10:22 AM, Ed Stallman wrote:
I'm using the LP-100A watt meter and comparing it with the KPA-1500 
they both read close enough 10 to 160 . On 6m I'm seeing a bigger 
spread  with the LP-100A reading 1500w the KPA-1500 is showing 1375w .


I also have an LP100A inline between my amp and my antenna switching. 
What coax is between the amp and the LP100A, and how long is it? The 
loss in this cable increases with frequency. Also, I believe that the 
KPA1500 reads power on the amplifier side of the tuner, and it's not 
lossless. I nearly always see a fractional dB between them.


73, Jim K9YC
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Re: [Elecraft] KPA-1500 power reading ?

[Jim Brown]

On 2/5/2021 10:22 AM, Ed Stallman wrote:
I'm using the LP-100A watt meter and comparing it with the KPA-1500 they 
both read close enough 10 to 160 . On 6m I'm seeing a bigger spread  
with the LP-100A reading 1500w the KPA-1500 is showing 1375w .


I also have an LP100A inline between my amp and my antenna switching. 
What coax is between the amp and the LP100A, and how long is it? The 
loss in this cable increases with frequency. Also, I believe that the 
KPA1500 reads power on the amplifier side of the tuner, and it's not 
lossless. I nearly always see a fractional dB between them.


73, Jim K9YC
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[Elecraft] KAT500

[ws6x.ars]

Hello,

I have a guy trying to sell me a used KAT500, SN 0296. He sent me an actual
photo with the SN clearly showing. Also in the photo is KPA500 SN 0702.
Something seems suspicious. I did a Google image search, but the results
were inconclusive.

Does anyone in this group own, or has ever owned this pair?

Please contact me off list.

Thanks,

Jim - WS6X

 

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Re: [Elecraft] KPA500 TX with second radio SOLVED

[Jack Brindle via Elecraft]

This bothered me a bit, so I took a good look at the source code and did some 
testing. my results may be interesting.

Chuck’s description with the K3S Not connected to the KPA are correct. When 
nothing is connected to the band lines, they are pulled high inside the KPA500. 
In the two radio modes that rely on BAND inputs, this would be an invalid band 
() and not allow the amplifier to go into OPER mode. Chuck is correct here 
in that switching to either analog or serial mode will allow the operation he 
desires.

But, there is another choice. When the KPA500 is in one of the BCD modes (RADIO 
= K3 or BCD), and the band signals indicate a valid band, then the KPA will go 
into OPER mode and should work properly.
Now, how can this happen with a K3 or K3S attached? The K3/K3S has resistive 
pull-ups on the band signals, so the signals are pulled up to Vcc when they are 
not driven to ground. Vcc is the 5V regulated power bus in the transceiver when 
it is powered. But when the K3/K3S is powered off, the 5V rail will sink to the 
0V level as the capacitors bleed off. That means that the band signals are 
actually pulled to 0V (ground) a short time after the K3/K3S is powered off. 
This combination defines a valid band, and if the KPA is set to K3 or BCD 
modes, the amplifier will actually switch to the 60 meter band. It will also go 
into OPER mode if you tap the OP button.

So, the alternative solution is to leave the K3S attached, power it off, wait 
until the KPA500 switches to 60 meters, then you can switch the KPA into OPER 
mode, switch the input to the alternate rig, and start operating.

73!
Jack, W6FB


> On Feb 5, 2021, at 5:12 AM, Chuck Chandler  wrote:
> 
> OK, I've figured out the problem.  I took a step back and realized I am 
> spoiled by the close integration of the K-Line.  The reason the FT101 can't 
> key the amp is because, unless the K3S is turned on, the amp won't leave 
> STANDBY mode.  
> 
> Even with the AUX cable disconnected, the amp sits in STANDBY and pushing the 
> OPER-STBY button doesn't do anything.  I guessed a menu setting might control 
> this, and setting the KPA Menu item RADIO to ANALOG now allows me to switch 
> bands and from STANDBY to OPERATE via the KPA front panel buttons with the 
> K3S turned off.  
> 
> A quick test shows 25 watts of tube-generated CW gives 450 watts output.  
> Looks like I'm in business.  Just need to change the menu item when I switch 
> radios.  
> 
> Many thanks to all for the help!
> 
> 73 de Chuck, WS1L
> 
> chandler...@gmail.com 
> 
> On Fri, Feb 5, 2021 at 7:12 AM Chuck Chandler  > wrote:
> Just tried it out - AUX cable removed, RF Input cable removed, RCA plug with 
> clip leads inserted in PA Key.  Shorting the leads does not put KPA in TX.  
> 
> 73 de Chuck, WS1L
> 
> chandler...@gmail.com 
> 
> On Thu, Feb 4, 2021 at 6:54 PM Jack Brindle  > wrote:
> That is good. If you plug a pig-tail RCA jack into the KPA’s PTT input and 
> short the wires, does the KPA go into TX mode? If so, the issue is in the 
> transmitter or the cable you are using.
> You should do this test with nothing connected to the KPA’s RF input. 
> 
> As i noted in my post to the reflector, Fred Cady’s book has some very good 
> info about this. Now if I can find it in my electronic copy...
> 
> 73!
> Jack, W6FB
> 
> 
>> On Feb 4, 2021, at 3:47 PM, Chuck Chandler > > wrote:
>> 
>> Hi Jack
>> 
>> It’s a Yaesu FT101ZD, and my multimeter shows it closes continuity between 
>> the key line center and shield on TX. 
>> 
>> No grid block keying!
>> 
>> Chuck
>> 
>> On Thu, Feb 4, 2021 at 18:37 Jack Brindle > > wrote:
>> Chuck;
>> 
>> What is the PTT output from your other radio? It needs to be just 
>> open-circuit, pull to ground on transmit. If anything else (I’m thinking 
>> grid-block keying), then I predict a trip back to the factory for your KPA.
>> 
>> There are two key lines coming into the KPA, and going through the KAT. 
>> These are the AUX I/O PTT, and the RCA-jack PTT. They are maintained 
>> separately through the Kat on their way to the KPA. Either can key the 
>> KPA500, and both are opened by the KAT when it has high SWR or needs to 
>> tune. The AUX I/O version is only meant be used with Elecraft rigs using 0 - 
>> 5 signaling. The RCA jack is likewise meant to be used with rigs that only 
>> pull the signal to ground on transmit, and leave it open on receive.
>> 
>> Thus my question - what i the signal characteristic of the rigs PTT output?
>> 
>> 73!
>> Jack, W6FB
>> Elecraft Engineering
>> 
>> 
>> > On Feb 4, 2021, at 2:15 PM, Chuck Chandler > > > wrote:
>> > 
>> > Just a follow-up to my question about using the KPA500/KAT500 with a
>> > second, older radio.  I just finished some more testing and found that when
>> > I remove the AUX cable 

Re: [Elecraft] KPA-1500 power reading ?

[Ed Stallman]

Lou , just checked again on the HF bands

80m LPA=1495 and KPA=1501

40m LPA=1476 and KPA=1421

6m LPA=1512 and KPA=1325

This is not concerning to me at all . My curiosity and a cold rainy told 
me to see how others compared . I suspect this is the case with any two 
watt meters . I know it's adjustable in the KPA 1500 but I'll not bother 
. Thanks everyone for ur reply .


73 Ed N5DG



On 2/5/2021 5:06 PM, Lou W0FK wrote:

Ed Stallman-2 wrote

The KPA1500 is new to me and very happy with my purchase . I'm using the
LP-100A watt meter and comparing it with the KPA-1500 they both read
close enough 10 to 160 . On 6m I'm seeing a bigger spread  with the
LP-100A reading 1500w the KPA-1500 is showing 1375w . If you look at
this in DB , it's nothing. I know the LP-100A is very accurate and the
only way to know for sure is to have Larry at Telepost test it. Most
likely wont do wont do that. Are their others that see a difference on 6m
?

Thanks Ed N5DG

I have the same setup Ed (KPA1500/LPA-100A). I've always seen a difference,
and never really paid much attention to it. When I read your email I ran
some very quick and dirty tests, here's what I'm seeing:

80M:  LPA -- 1322, KPA1500 -- 1513
40M:  LPA -- 1325, KPA1500 -- 1504
  6M:   LPA -- 1345, KPA1500 -- 1550

Pretty consistent with your 6M readings. Are you seeing much closer numbers
than mine?

73, Lou W0FK






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Re: [Elecraft] KPA-1500 power reading ?

[Lou W0FK]

Ed Stallman-2 wrote
> The KPA1500 is new to me and very happy with my purchase . I'm using the 
> LP-100A watt meter and comparing it with the KPA-1500 they both read 
> close enough 10 to 160 . On 6m I'm seeing a bigger spread  with the 
> LP-100A reading 1500w the KPA-1500 is showing 1375w . If you look at 
> this in DB , it's nothing. I know the LP-100A is very accurate and the 
> only way to know for sure is to have Larry at Telepost test it. Most 
> likely wont do wont do that. Are their others that see a difference on 6m
> ?
> 
> Thanks Ed N5DG

I have the same setup Ed (KPA1500/LPA-100A). I've always seen a difference,
and never really paid much attention to it. When I read your email I ran
some very quick and dirty tests, here's what I'm seeing:

80M:  LPA -- 1322, KPA1500 -- 1513
40M:  LPA -- 1325, KPA1500 -- 1504
 6M:   LPA -- 1345, KPA1500 -- 1550

Pretty consistent with your 6M readings. Are you seeing much closer numbers
than mine?

73, Lou W0FK






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[Elecraft] K2 and Hard rock amp package price reduction.

[barry halterman]

I am reducing my asking price of the K2, SN: 7954 and hard rock 50 amp. I
will split them up if necessary. Neither have ATU's. K2 has the k2I/O and
KFIL, asking $650. The HR50 asking $200.
You pay shipping.
Contact me off the reflector, please.
Thanks.
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[Elecraft] KPA-1500 power reading ?

[Ed Stallman]

The KPA1500 is new to me and very happy with my purchase . I'm using the 
LP-100A watt meter and comparing it with the KPA-1500 they both read 
close enough 10 to 160 . On 6m I'm seeing a bigger spread  with the 
LP-100A reading 1500w the KPA-1500 is showing 1375w . If you look at 
this in DB , it's nothing. I know the LP-100A is very accurate and the 
only way to know for sure is to have Larry at Telepost test it. Most 
likely wont do wont do that. Are their others that see a difference on 6m ?


Thanks Ed N5DG


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Re: [Elecraft] KV5J's line of Digital Displays for Elecraft's W2, KXPA100, KPA500, and KPA1500

[Keith Ennis via Elecraft]

Thanks for the great reviews on ehams for my KPA500 Digital Display Unit.

"The DDU is what the display on my KPA500 should be. It sits under a computer 
monitor where it effectively displays the current telemetry of the amp. It is a 
great accessory that keeps me from having to reach over and press buttons on 
the amp to see what is going on. The DDU makes for more effective operations."

"Recently stumbled upon this item. It sounded just like what I wanted. It 
eliminates having to press the various buttons on the KPA500 to see the 
different readings. With this little box everything you need to know is right 
there at one time. It's bright and easily readable, yet it's small and takes up 
very little room.
Keith sent it within two days and I had it unboxed, connected and working in 
about 20 minutes.
This is definitely one of the more useful side items I'll be using in the 
shack."

"This unit is terrific and an excellent value for the money. Showing the 7 
parameters and I like seeing all of the amplifier's vital readings. It looks 
good and works great. The unit arrived quickly via USPS and was packed 
extremely well. Very happy with this unit! Thank you, Keith."

73

Keith, KV5J
http://www.kv5j.com







On Sunday, January 3, 2021, 10:04:24 AM CST, Keith Ennis  
wrote: 





KV5J's line of Digital Displays for Elecraft's W2, KXPA100, KPA500, and KPA1500

Digital Display Unit for Elecraft's W2 Watt Meter:

With digital read out the Display Unit takes the guess work out of the LED 
light bar.


Digital Display Unit for Elecraft's KXPA100 amplifier:

Don't wait for a fault light to come on.  Keep an eye on 5 crucial readings at 
all times.
1. Power amplifier's heat sink temperature
2. Power amplifier's high voltage supply voltage
3. Power amplifier's current
4. Power amplifier's output power
5. SWR that the KXPA100 sees at its output


Digital Display Unit for Elecraft's KPA500 amplifier:

Instead of seeing only 1 crucial reading, monitor all 7 at the same time.
1. Power amplifier's heat sink temperature
2. Power amplifier's high voltage supply voltage
3. Power amplifier's current
4. Power amplifier's output power
5. SWR that the KPA500 sees at its output
6. Displays Operate/Standby mode
7. Displays Band amp is tuned to


Digital Display Unit for Elecraft's KPA1500 amplifier:

Displays the same display that is on the KPA1500 Amplifier 
Change the display on the KPA1500 and the display changes to show this same 
screen


All of the Digital Display Units:

Display Unit can be located at a more visible location
Up to the RS232 limit from unit

Easy to read 2 line display
No USB or serial cable to computer
No com port in Windows to manage
No computer needed
Plug and Play
Simply connect the SUPPLIED dc power cable (with inline on/off switch) from the 
DDU to power supply and SUPPLIED  SERIAL data jumper cable to the device
Retains all functions of the front panel
All displayed info obtained directly from the device

Only 4" x 4" x 2"


For more information and ordering go to:   http://www.kv5j.com/store

Reviews:
https://www.eham.net/reviews/view-product?id=14701

https://www.eham.net/reviews/view-product?id=14820




Keith, KV5J
http://www.kv5j.com
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Re: [Elecraft] KPA500 TX with second radio SOLVED

[Chuck Chandler]

OK, I've figured out the problem.  I took a step back and realized I am
spoiled by the close integration of the K-Line.  The reason the FT101 can't
key the amp is because, unless the K3S is turned on, the amp won't leave
STANDBY mode.

Even with the AUX cable disconnected, the amp sits in STANDBY and pushing
the OPER-STBY button doesn't do anything.  I guessed a menu setting might
control this, and setting the KPA Menu item RADIO to ANALOG now allows me
to switch bands and from STANDBY to OPERATE via the KPA front panel buttons
with the K3S turned off.

A quick test shows 25 watts of tube-generated CW gives 450 watts output.
Looks like I'm in business.  Just need to change the menu item when I
switch radios.

Many thanks to all for the help!

73 de Chuck, WS1L

chandler...@gmail.com


On Fri, Feb 5, 2021 at 7:12 AM Chuck Chandler  wrote:

> Just tried it out - AUX cable removed, RF Input cable removed, RCA plug
> with clip leads inserted in PA Key.  Shorting the leads does not put KPA in
> TX.
>
> 73 de Chuck, WS1L
>
> chandler...@gmail.com
>
>
> On Thu, Feb 4, 2021 at 6:54 PM Jack Brindle  wrote:
>
>> That is good. If you plug a pig-tail RCA jack into the KPA’s PTT input
>> and short the wires, does the KPA go into TX mode? If so, the issue is in
>> the transmitter or the cable you are using.
>> You should do this test with nothing connected to the KPA’s RF input.
>>
>> As i noted in my post to the reflector, Fred Cady’s book has some very
>> good info about this. Now if I can find it in my electronic copy...
>>
>> 73!
>> Jack, W6FB
>>
>>
>> On Feb 4, 2021, at 3:47 PM, Chuck Chandler  wrote:
>>
>> Hi Jack
>>
>> It’s a Yaesu FT101ZD, and my multimeter shows it closes continuity
>> between the key line center and shield on TX.
>>
>> No grid block keying!
>>
>> Chuck
>>
>> On Thu, Feb 4, 2021 at 18:37 Jack Brindle  wrote:
>>
>>> Chuck;
>>>
>>> What is the PTT output from your other radio? It needs to be just
>>> open-circuit, pull to ground on transmit. If anything else (I’m thinking
>>> grid-block keying), then I predict a trip back to the factory for your KPA.
>>>
>>> There are two key lines coming into the KPA, and going through the KAT.
>>> These are the AUX I/O PTT, and the RCA-jack PTT. They are maintained
>>> separately through the Kat on their way to the KPA. Either can key the
>>> KPA500, and both are opened by the KAT when it has high SWR or needs to
>>> tune. The AUX I/O version is only meant be used with Elecraft rigs using 0
>>> - 5 signaling. The RCA jack is likewise meant to be used with rigs that
>>> only pull the signal to ground on transmit, and leave it open on receive.
>>>
>>> Thus my question - what i the signal characteristic of the rigs PTT
>>> output?
>>>
>>> 73!
>>> Jack, W6FB
>>> Elecraft Engineering
>>>
>>>
>>> > On Feb 4, 2021, at 2:15 PM, Chuck Chandler 
>>> wrote:
>>> >
>>> > Just a follow-up to my question about using the KPA500/KAT500 with a
>>> > second, older radio.  I just finished some more testing and found that
>>> when
>>> > I remove the AUX cable from the back of the KPA and try to put the KPA
>>> into
>>> > TX with the keyline, it stays in RX.
>>> >
>>> > A continuity tester confirms the rig keyline is closing when the rig
>>> is in
>>> > TX, and the KPA shows driver power output, as does the KAT.  But, the
>>> KPA
>>> > won't switch to TX and amplify.
>>> >
>>> > Is there some other function keeping the KPA in RX even though the AUX
>>> > cable is disconnected?
>>> >
>>> > 73 de Chuck, WS1L
>>> >
>>> > chandler...@gmail.com
>>> > __
>>> > Elecraft mailing list
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>>> >
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>>> > Message delivered to jackbrin...@me.com
>>>
>>> --
>> Sent from Gmail Mobile Chuck Chandler chandler...@gmail.com
>>
>>
>>
__
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