[Elecraft] Elecraft W2 Wattmeter

[Josep Torres via Elecraft]

Looking for a used one in good condition. If you have one and not using, maybe 
you’re interested in selling.


73,

Josep
EA6BF
BUG #256  -  CWops #3072  -  FOC #2182 (ex 1724)




> On Jul 19, 2022, at 16:53, Frank Krozel  wrote:
> 
> Someone mentioned last week that they sent in their K3 and got a 1 week 
> turnaround.
> Elecraft has answered all my questions and called me back with some 
> additional questions I had with a one day turn-around on the emails and calls.
> (Thanks Doug and Wayne)
> 
> -73-  FrankKG9H
> kg9hfr...@gmail.com
> 
> 
> 
> 
>> On Jul 19, 2022, at 9:44 AM, Rip R  wrote:
>> 
>> There was a thread regarding the lengthy process of getting an Elecraft
>> radio repaired and I was concerned about this issue. Has this situation
>> improved? From my perspective, one of the reasons a person would purchase
>> an Elecraft transceiver would be both reliability and service. Thanks for
>> any update. 73s Roger W7RIP
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Re: [Elecraft] Elecraft W2 Wattmeter for sale ... needs repair

[ke9uw]

Tempting, but I already have one. These are expensive or I'd bid on it for
fun too. Should be an easy fix...maybe.



-
Chuck, KE9UW
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Re: [Elecraft] Elecraft W2 Wattmeter for sale ... needs repair

[Victor Rosenthal]

I'd buy it just for the fun of fixing it if I still lived in the USA!

73,
Victor, 4X6GP
Rehovot, Israel
CWops #5
Formerly K2VCO
https://www.qsl.net/k2vco/

On 15/04/2021 20:33, David Gilbert wrote:


I have a W2 wattmeter with the 2 KW sensor that no longer functions.

I'm almost certain that the sensor element got zapped when one of the
high power thick film resistors in my homebrew dummy load popped.  The
bar graph on the meter now always reads infinite SWR but otherwise seems
to work fine, and I've swapped out the RJ-45 cable so I know that isn't
the problem.  Nothing is obviously amiss inside the sensor element, but
I'm pretty sure that's where the problem is.


Anyway, I've switched to a different passive wattmeter and it seems

like someone should be able to make use of my W2 ... either by buying a
new sensor element from Elecraft or by trying to get them to repair this
one for a reasonable fee.


Best reasonable offer, and I'll pay domestic shipping via USPS.

73, Dave   AB7E


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Re: [Elecraft] Elecraft W2 Wattmeter for sale ... needs repair

[Victor Rosenthal 4X6GP]

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[Elecraft] Elecraft W2 Wattmeter for sale ... needs repair

[David Gilbert]

I have a W2 wattmeter with the 2 KW sensor that no longer functions.  
I'm almost certain that the sensor element got zapped when one of the 
high power thick film resistors in my homebrew dummy load popped.  The 
bar graph on the meter now always reads infinite SWR but otherwise seems 
to work fine, and I've swapped out the RJ-45 cable so I know that isn't 
the problem.  Nothing is obviously amiss inside the sensor element, but 
I'm pretty sure that's where the problem is.


Anyway, I've switched to a different passive wattmeter and it seems like 
someone should be able to make use of my W2 ... either by buying a new 
sensor element from Elecraft or by trying to get them to repair this one 
for a reasonable fee.


Best reasonable offer, and I'll pay domestic shipping via USPS.

73,
Dave   AB7E

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Re: [Elecraft] W2 wattmeter

[Don Wilhelm]

Joe,

The telling answer is in your statement "the radio has an internal ATU".
The radio is showing the SWR between the radio and the ATU.
The wattmeter is showing you the SWR after the ATU - in other words, the 
SWR of the untuned antenna.  So there may be nothing wrong.


Connect a dummy load to the wattmeter output and see what that reads - 
should be 1.0.


73,
Don W3FPR

On 8/29/2020 1:29 PM, Joseph McIntire wrote:

My wattmeter  seems to be displaying  the wrong SWR on the LEDs. I bought a 
digital display unit on line. The radio has an internal ATU. The radio says 
tuned 1.0 - 1. when I key the radio says 1.0 - 1 and the DDU says .16 SWR but 
the LEDs show 1.5 - 1. So if I hit 1.2 - 1 the LEDs all flash so I can not tell 
at a glance if the SWR is good. So I was wondering if any one had seen this or 
know  if it can be  fixed without sending it in. I already  replaced the 
coupler do to i thought that was the problem.

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[Elecraft] W2 wattmeter

[Joseph McIntire]

My wattmeter  seems to be displaying  the wrong SWR on the LEDs. I bought a 
digital display unit on line. The radio has an internal ATU. The radio says 
tuned 1.0 - 1. when I key the radio says 1.0 - 1 and the DDU says .16 SWR but 
the LEDs show 1.5 - 1. So if I hit 1.2 - 1 the LEDs all flash so I can not tell 
at a glance if the SWR is good. So I was wondering if any one had seen this or 
know  if it can be  fixed without sending it in. I already  replaced the 
coupler do to i thought that was the problem.

 Joe
 AB3JN

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Re: [Elecraft] F/S Elecraft W2 Wattmeter + three couplers SOLD

[Joe Hall]

Item has been sold.
 
 
--
Joe Hall 
 
 
From: Joseph Hall  
Sent: Friday, October 11, 2019 2:29 PM
To: elecraft@mailman.qth.net
Subject: F/S Elecraft W2 Wattmeter + three couplers
 
For sale is one Elecraft W2 wattmeter in "like new condition" with all three 
directional couplers (1.8-54 200W; 1.8-54 2000W; and 144-450 200W), KXUSB 
cable, power cable with powerpoles on one end, and A/C adapter that works with 
the W2.  Note that the directional couplers are the early version that do not 
work with the P3 panadapter.

$300 shipped via USPS Priority Mail to US locations.  Payment via paypal +3% or 
personal check (with delay until check clears).  

Contact info:  Joe Hall (WB1M), 13 Low Road, Hanover, NH 03755.  
Email: j...@ioka.net <mailto:j...@ioka.net>   

Thanks!
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[Elecraft] F/S Elecraft W2 Wattmeter + three couplers

[Joseph Hall]

For sale is one Elecraft W2 wattmeter in "like new condition" with all
three directional couplers (1.8-54 200W; 1.8-54 2000W; and 144-450 200W),
KXUSB cable, power cable with powerpoles on one end, and A/C adapter that
works with the W2.  Note that the directional couplers are the early
version that do not work with the P3 panadapter.

$300 shipped via USPS Priority Mail to US locations.  Payment via paypal
+3% or personal check (with delay until check clears).

Contact info:  Joe Hall (WB1M), 13 Low Road, Hanover, NH 03755.
Email: j...@ioka.net

Thanks!
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[Elecraft] W2 wattmeter for sale

[Doug Shields]

Hello everyone,

  I have an excellent condition Elecraft W2 wattmeter for sale.  It has
the 200 watt HF +6 meter coupler.  I will include the coupler cable, RS-232
data cable, 12V DC power cable with powerpole connector installed, and the
original owner's manual.  There are no issues with the meter.  $250 shipped
and insured to any US destination.  I can accept payments through Paypal,
cash, check, or money order.

 

Doug  W4DAS



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Re: [Elecraft] W2 wattmeter maximum Cat5 cable length

[Jack Brindle via Elecraft]

The cable is indeed not cat-5, but rather 8 individual wires that carry power 
and ground one way (to the box) and analog sensor signals back. The twist 
action in CAT-5 does not help here at all.
The things to watch for are signal loss due to resistance (shouldn’t be too 
bad, depending on the wire and length), and RF pickup. The latter can lead to 
bad and erratic readings.
The best advice is to keep the cable as short as possible.

73,
Jack, W6FB


> On Jul 10, 2018, at 12:06 PM, Dick Green WC1M  wrote:
> 
> Thanks. First real info I've gotten. I said Cat5 because the documentation 
> mentions it and I believe it says you can use a standard Ethernet cable.
> 
> I haven't taken a close look at the coupler circuitry. If it's like most 
> remote couplers I've seen, a too-long cable can cause a drop in the DC 
> voltages that carry the forward and reflected power signals. If the coupler 
> does a conversion to digital, then the cable length wouldn't be an issue. But 
> that sounds pretty fancy!
> 
> 73, Dick WC1M
> 
> -Original Message-
> From: Jeff KC9WSJ  
> Sent: Tuesday, July 10, 2018 12:47 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] W2 wattmeter maximum Cat5 cable length
> 
> the standard cable is not Cat5, it's just a ribbon cable with RJ45's (I
> think?) at each end.
> Cat5 should work, though, and I'd be surprised if anything less than ~50ft+ 
> would be an issue.
> 
> --
> Jeff KC9WSJ 
> 
> On Mon, 2018-07-09 at 23:51 -0400, Dick Green wrote:
>> The W2 wattmeter comes with a 5-foot Cat5 cable to connect the coupler 
>> to the display unit. I need to use a longer cable, maybe 10-15 feet. 
>> I’ve searched the reflector archives and web for any information about 
>> the max
>> Cat5 cable length but haven’t found any.
>> 
>> Does anyone know? Does the calibration routine in the W2 Utility 
>> compensate for different cable lengths?
>> 
>> 73, Dick WC1M
> 
> 
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Re: [Elecraft] W2 wattmeter maximum Cat5 cable length

[Dick Green WC1M]

Thanks. First real info I've gotten. I said Cat5 because the documentation 
mentions it and I believe it says you can use a standard Ethernet cable.

I haven't taken a close look at the coupler circuitry. If it's like most remote 
couplers I've seen, a too-long cable can cause a drop in the DC voltages that 
carry the forward and reflected power signals. If the coupler does a conversion 
to digital, then the cable length wouldn't be an issue. But that sounds pretty 
fancy!

73, Dick WC1M

-Original Message-
From: Jeff KC9WSJ  
Sent: Tuesday, July 10, 2018 12:47 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] W2 wattmeter maximum Cat5 cable length

the standard cable is not Cat5, it's just a ribbon cable with RJ45's (I
think?) at each end.
Cat5 should work, though, and I'd be surprised if anything less than ~50ft+ 
would be an issue.

--
Jeff KC9WSJ 

On Mon, 2018-07-09 at 23:51 -0400, Dick Green wrote:
> The W2 wattmeter comes with a 5-foot Cat5 cable to connect the coupler 
> to the display unit. I need to use a longer cable, maybe 10-15 feet. 
> I’ve searched the reflector archives and web for any information about 
> the max
> Cat5 cable length but haven’t found any.
> 
> Does anyone know? Does the calibration routine in the W2 Utility 
> compensate for different cable lengths?
> 
> 73, Dick WC1M


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Re: [Elecraft] W2 wattmeter maximum Cat5 cable length

[Jeff KC9WSJ]

the standard cable is not Cat5, it's just a ribbon cable with RJ45's (I
think?) at each end.
Cat5 should work, though, and I'd be surprised if anything less than ~50ft+
would be an issue.

-- 
Jeff KC9WSJ 

On Mon, 2018-07-09 at 23:51 -0400, Dick Green wrote:
> The W2 wattmeter comes with a 5-foot Cat5 cable to connect the coupler to
> the display unit. I need to use a longer cable, maybe 10-15 feet. I’ve
> searched the reflector archives and web for any information about the max
> Cat5 cable length but haven’t found any.
> 
> Does anyone know? Does the calibration routine in the W2 Utility
> compensate for different cable lengths?
> 
> 73, Dick WC1M
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[Elecraft] W2 wattmeter maximum Cat5 cable length

[Dick Green]

The W2 wattmeter comes with a 5-foot Cat5 cable to connect the coupler to the 
display unit. I need to use a longer cable, maybe 10-15 feet. I’ve searched the 
reflector archives and web for any information about the max Cat5 cable length 
but haven’t found any.

Does anyone know? Does the calibration routine in the W2 Utility compensate for 
different cable lengths?

73, Dick WC1M

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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Don Wilhelm]

Michael,

In general, digital wattmeters have the same accuracy at any point on 
the scale - unlike analog wattmeters for which the accuracy is stated as 
a percentage of the full scale reading.  On a 20 watt scale, a 25% error 
would be up to 4 watts!


You might want to look at the specs for that 440 MHz transmitter as 
well.  If it 2.6 dB or so, getting 2.8 watts out for a 5 watt setting 
may be what you can expect.


73,
Don W3FPR

On 7/30/2017 4:59 PM, Michael via Elecraft wrote:

OK so I am trying to measure around 5 Watts or so on the W2's 20 Watt
scale.  The spec's for the W2 directional couplers are listed at 0.5 dB
accuracy.  Is this anywhere or just at full scale? How much could it  be off at
only 25% of full scale?
  
Trying to decide if the 2.8 Watts I am reading at 440 MHz on high power is

too low with a spec of 5 Watts output!  If it is I can send it back to the
place of purchase to be checked and exchanged if necessary.
  
There seems to be no problem on the 2 Meter band at only 25 % of scale (5

Watts) readingjust on 440.
  
Michael

n2zdb
  
  
  
  
  
  
In a message dated 07/30/2017 12:36:49 P.M. Eastern Daylight Time,

elecraftcov...@gmail.com writes:

  



The accuracy of a Bird Model 43 is +/- 5% of full scale.  The meter  scale
is not
linear and produces the best read accuracy in the bottom portion of the
meter's
scale.


There are numerous watt meters on the market today that are more  accurate.
  



FWIW  73!


Ken Kopp - K0PP


--
On Sun, Jul 30, 2017 at 9:23 AM, Michael Walker 
wrote:

The  only way to get the answer you wish is to compare it to a bench
standard  like a bird watt meter.

Beyond that you are just guessing.   Sorry

Mike va3mw


On Sun, Jul 30, 2017 at 11:18 AM,  Michael via Elecraft <
elecraft@mailman.qth.net>  wrote:


Measurement is in analog mode.should have made that  clear or not even
mentioned a digital radio!

  Michael





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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Michael via Elecraft]

OK so I am trying to measure around 5 Watts or so on the W2's 20 Watt  
scale.  The spec's for the W2 directional couplers are listed at 0.5 dB  
accuracy.  Is this anywhere or just at full scale? How much could it  be off at 
only 25% of full scale?
 
Trying to decide if the 2.8 Watts I am reading at 440 MHz on high power is  
too low with a spec of 5 Watts output!  If it is I can send it back to the  
place of purchase to be checked and exchanged if necessary.
 
There seems to be no problem on the 2 Meter band at only 25 % of scale (5  
Watts) readingjust on 440.
 
Michael
n2zdb
 
 
 
 
 
 
In a message dated 07/30/2017 12:36:49 P.M. Eastern Daylight Time,  
elecraftcov...@gmail.com writes:

 


The accuracy of a Bird Model 43 is +/- 5% of full scale.  The meter  scale 
is not
linear and produces the best read accuracy in the bottom portion of the  
meter's 
scale.  


There are numerous watt meters on the market today that are more  accurate. 
 


FWIW  73!


Ken Kopp - K0PP


--
On Sun, Jul 30, 2017 at 9:23 AM, Michael Walker  
wrote:

The  only way to get the answer you wish is to compare it to a bench
standard  like a bird watt meter.

Beyond that you are just guessing.   Sorry

Mike va3mw


On Sun, Jul 30, 2017 at 11:18 AM,  Michael via Elecraft <
elecraft@mailman.qth.net>  wrote:

> Measurement is in analog mode.should have made that  clear or not even
> mentioned a digital radio!
>
>  Michael




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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Michael Walker]

The only way to get the answer you wish is to compare it to a bench
standard like a bird watt meter.

Beyond that you are just guessing.   Sorry

Mike va3mw


On Sun, Jul 30, 2017 at 11:18 AM, Michael via Elecraft <
elecraft@mailman.qth.net> wrote:

> Measurement is in analog mode.should have made that clear or not even
> mentioned a digital radio!
>
> Michael
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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Michael via Elecraft]

Measurement is in analog mode.should have made that clear or not even  
mentioned a digital radio!
 
Michael
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Re: [Elecraft] W2 Wattmeter 440 band accuracy?

[Philip]

That would depend on what kind of digital you are talking about. I don't 
think the W2 reads instantaneous peak power. That usually takes special 
circuitry to do . Hint: a digital slug for a bird 43 wattmeter costs way 
more than the meter does. Analog meters will not read properly in a 
digital environment. Try the radio in analog mode.


Phil, wd8qwr
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[Elecraft] W2 Wattmeter 440 band accuracy?

[Michael via Elecraft]

I just purchased a new Yaesu digital handheld and the power level on the  
440 band is low (2.8 v 5.0 Watts), and was wondering if I can trust the W2's  
accuracy? Another mobile higher powered transceiver also reads low on all 
power  levels on the 440 band.
 
I built the kit version of the W2 and have the VHF/UHF  coupler
 
Why is there a +/- calibration button on the PC interface if the unit is  
calibrated properly?
 
I can send my HT back to be tested and exchanged if it isn't making specs  
but don't want to be told that
my wattmeter reading was inaccurate!
 
73's Michael
n2zdb
 
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[Elecraft] Sold - Elecraft W2 Wattmeter with HF 2kw coupler

[Paul]

 

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[Elecraft] FS Elecraft W2 Wattmeter with HF 2kw coupler

[Paul]

Selling 8 month old kit built W2, works and looks fine.

Includes W2, HF 2kw coupler, sensor cable, USB data cable, power cable and
instructions.

 

$220 including priority mail shipping

Paypal only

Pictures available

 

Paul  W2LE

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[Elecraft] W2 wattmeter lock-up

[JOE]

I had a situation where the W2 watt meter would flash the LEDs on power 
up, then I was not able to communicate with it via the RS232 cable.  
After repeated attempts, I was able to quickly press the LED on/off 
button on the software during power up to make it come back to life.  I 
had to press this button during the power up cycle or the W2 would not 
respond.  Evidently the LED button got pushed by accident, but it put 
the W2 in an inoperable mode that required a site visit to our remote 
base location.


Has anyone else experienced this?  Probably most people never use this 
feature.


73, Joe, K1ike
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[Elecraft] For Sale: Elecraft W2 Wattmeter

[David Inger]

I have for sale a W2 SWR/Wattmeter in as-new condition.  The package
includes the W2, the 2 kw directional coupler (remote sensor),
interconnecting cable, power cable, programming cable and owners manual.
These are fantastic, compact and highly accurate units.  $210 FIRM including
shipping to any US ZIP code. PayPal or USPS money order.
 
Tnx es 73 de K6SBA
David in Santa Barbara, CA
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[Elecraft] W2 Wattmeter & 200 Watt Coupler Available

[Ed Gansen]

I have a W2 Wattmeter with DCHF-200 Directional Coupler excess to my needs. 
Excellent condition and just checked out by Elecraft. $180.000, including CONUS 
shipping. Contact me off-list at k8...@arrl.net.

73' Ed - K8DSS
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Re: [Elecraft] W2 Wattmeter & 200 Watt Coupler Available

[Ed Gansen]

W2 has been sold.

Ed - K8DSS

> On Sep 23, 2015, at 8:17 AM, Ed Gansen  wrote:
> 
> I have a W2 Wattmeter with DCHF-200 Directional Coupler excess to my needs. 
> Excellent condition and just checked out by Elecraft. $180.000, including 
> CONUS shipping. Contact me off-list at k8...@arrl.net.
> 
> 73' Ed - K8DSS
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[Elecraft] FS: Elecraft W2 Wattmeter

[W0FK]

Elecraft W2 Wattmeter with HF 1-2000 W sensor for 1-54 MHz. $195 shipped
CONUS. Please email me off the list.  Lou, W0FK




-
St. Louis, MO
K3 #'s 7463 and 2513, P3 #620, KX1 #1517, KX3 #0036, KXPA100 #252

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Re: [Elecraft] FS: Elecraft W2 Wattmeter

[W0FK]

W2 is sold, thanks to all who responded.



-
St. Louis, MO
K3 #'s 7463 and 2513, P3 #620, KX1 #1517, KX3 #0036, KXPA100 #252

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Re: [Elecraft] W2 Wattmeter Failure

[Alan]

Hi Roger,

I'm looking at the W2 kilowatt sensor schematic and scratching my head 
trying to figure out how that could have happened.  There are 49.9k 
resistors in series with all the op amp inputs, so there would have to 
be hundreds of volts coming out of the detectors to damage the devices. 
 Plus the fact that all 4 op amps (actually two dual op amps) were 
destroyed argues against that as well.


I would suspect the 5V op-amp power supply.  Perhaps there was a failure 
in the W2 power supply or maybe a spike on the supply.  A large voltage 
transient causing a current spike in the sensor cable might do it, 
although it is hard to imagine 50W at 475 kHz doing that.


Alan N1AL


On 05/12/2015 11:21 PM, Roger Crofts wrote:

I made a rare QSO on 630 metres the other day. My W2 wattmeter was
in-line between the 630m transmitter and the 630m tuner. I was not
using the W2, because my 630m transmitter has its own internal SWR
meter. When I returned to normal HF operation, I noticed the W2 was
not working. I discovered all four unity gain op-amps in the W2
directional coupler were destroyed. I replaced the op-amps and the W2
operated normally again. The W2 wattmeter is not intended to operate
below 1.8 MHz, but it does have a 2KW rating, so one could be
forgiven for assuming it could handle 50 watts at 475 KHz. Next time
I operate on 630 metres, I will by-pass the W2. Roger, VK4YB


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[Elecraft] W2 Wattmeter

[wb5xx]

The W2 wattmeter has been sold.Thankks to all.
George wb5xx
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Re: [Elecraft] W2 wattmeter not reading xv50 output

[Bob KD7YZ]

On 1/24/2014 02:44, John Marvin wrote:
 1) ... Did you take note of SWR and reverse power using the W2 utility?

1.5:1

 2) Did you build your XV50 or did you get a factory built version?

W3FPR built and calibrated it.



 Final question. How were you generating the test signal and what mode
 were you using?

A paddle and in CW mode

-- 

Bob KD7YZ
http://www.qrz.com/db/KD7YZ
www.denstarfarm.us/LGD

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Re: [Elecraft] W2 wattmeter not reading xv50 output

[Bob KD7YZ]

On 1/22/2014 02:05, John Marvin wrote:
 Bob,

 You should try installing the W2 utility 

Just went and D/L. Thanks .

XV-50 into a dummy-load:
K3-DriveW2-UTil XV50 BarsW2-Box-LED

0.1mW drive 0.50W on W2 2 bars ((2W) 0
0.2mW drive 0.83W on W2 4 bars ( 5W  0
0.3mW drive 1.42W on W2 5 bars   7W  1 1watt
0.4mW drive 1.90W on W2 6 bars  10W  1 1watt
0.5mW drive 2.41W on W2 6 bars  10W  2 2watt

0.6mW drive 3.02W on W2 7 bars  15W  3 3watt
0.7mW drive 3.66W on W2 8 bars  20W  3 3watt
0.8mW drive 4.23W on W2 9 bars  25W  4 4watt
0.9mW drive 4.81W on W2 10bars  30W  4 4watt

1.0mW drive 5.35W on W2 10bars  30W  5 5watt
1.5mW drive 8.80W on W2 10bars  30W  8 8watt

So, as you see, nothing agrees with anything. Note: I am not a test-lab
and have little in the way of measurement equipment. Coaxial-Dynamics in
the PA output. However, 500/1000 watt slugs.

But, the XV50 drives the 180w 6m brick to an acceptable low limit (based
on XV50 drive).
The Brick drives the PA to 1250W .. so I can't complain in that regard.
Just wanted to monitor/see the output of the XV50 and can't seem to do it.

-- 

Bob KD7YZ
http://www.qrz.com/db/KD7YZ
www.denstarfarm.us/LGD

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Re: [Elecraft] W2 wattmeter not reading xv50 output

[John Marvin]

I'm not sure I can explain this. But it's possible the problem is a 
combination of two possible error sources:


1) I believe the XV50 leds are displaying power based on the voltage at 
the final stage, and is not using a SWR bridge to measure forward power. 
The W2 is measuring forward power, so if the SWR is greater not 1:1 then 
it will measure a lower value than what the XV50 is displaying. Did you 
take note of SWR and reverse power using the W2 utility? Since you are 
driving another amp I wouldn't expect a really high SWR though.


2) Did you build your XV50 or did you get a factory built version? If 
factory built then Elecraft would have properly calibrated it. If you 
built it, did you perform all the calibration steps? Since you already 
mentioned you don't have a lot of test equipment, you may not have been 
able to calibrate the XV50 properly. In particular, if calibrated 
properly, 1mW drive should produce 20 watts output, not 30.  Also,  you 
should try to avoid sending more than 1mW to the XV50.


Final question. How were you generating the test signal and what mode 
were you using?


John
AC0ZG

On 1/23/2014 8:10 AM, Bob KD7YZ wrote:

On 1/22/2014 02:05, John Marvin wrote:

Bob,

You should try installing the W2 utility

Just went and D/L. Thanks .

XV-50 into a dummy-load:
K3-DriveW2-UTil XV50 BarsW2-Box-LED

0.1mW drive 0.50W on W2 2 bars ((2W) 0
0.2mW drive 0.83W on W2 4 bars ( 5W  0
0.3mW drive 1.42W on W2 5 bars   7W  1 1watt
0.4mW drive 1.90W on W2 6 bars  10W  1 1watt
0.5mW drive 2.41W on W2 6 bars  10W  2 2watt

0.6mW drive 3.02W on W2 7 bars  15W  3 3watt
0.7mW drive 3.66W on W2 8 bars  20W  3 3watt
0.8mW drive 4.23W on W2 9 bars  25W  4 4watt
0.9mW drive 4.81W on W2 10bars  30W  4 4watt

1.0mW drive 5.35W on W2 10bars  30W  5 5watt
1.5mW drive 8.80W on W2 10bars  30W  8 8watt

So, as you see, nothing agrees with anything. Note: I am not a test-lab
and have little in the way of measurement equipment. Coaxial-Dynamics in
the PA output. However, 500/1000 watt slugs.

But, the XV50 drives the 180w 6m brick to an acceptable low limit (based
on XV50 drive).
The Brick drives the PA to 1250W .. so I can't complain in that regard.
Just wanted to monitor/see the output of the XV50 and can't seem to do it.



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[Elecraft] W2 wattmeter not reading xv50 output

[Bob KD7YZ]

It's the correct sensor. The W2 reads the K3 output. But when it's
cabled to the Elecraft 6m Transverter, there is no power reading. I
sometimes see a few green LED's for 1.3 to 1.5 VSWR. Never a power reading.

-- 

Bob KD7YZ
http://www.qrz.com/db/KD7YZ
www.denstarfarm.us/LGD
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Re: [Elecraft] W2 wattmeter not reading xv50 output

[John Marvin]

Bob,

You should try installing the W2 utility (obviously you need to connect 
your W2 to a computer via the USB/serial cable that came with the W2 in 
order to do this). It shows the SWR and forward power with more 
precision than you get with the led front panel display. It would be 
interesting to see if you see a different reading when transmitting with 
the XV50 vs.  when you are not transmitting, even if the value is very 
low (i.e. low enough not to light a single led).


Which range led is lit on the front panel?

John
AC0ZG

On 1/21/2014 9:39 PM, Bob KD7YZ wrote:

It's the correct sensor. The W2 reads the K3 output. But when it's
cabled to the Elecraft 6m Transverter, there is no power reading. I
sometimes see a few green LED's for 1.3 to 1.5 VSWR. Never a power reading.



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Re: [Elecraft] W2 Wattmeter alarm function doesn't activate on hogh SWR

[Ken Roberson]

Vic,

OK , Same here , And right when I'm setup to use that feature .

73 Ken K5DNL / WG2XXM





On Saturday, December 28, 2013 10:43 PM, Vic Rosenthal K2VCO 
k2vco@gmail.com wrote:
 
Hello folks,

I sent this to Support, but they are probably resting up until Monday, 
so I thought I would ask here. Has anyone had this problem with the W2 
wattmeter?

I just assembled my unit. It seems to work correctly except that I can't 
enable the alarm function.

1. When I turn the W2 on, I hear the relay click, and it does interrupt 
the ptt at this point.

2. The W2 utility program (USB, running on XP) finds and communicates 
with the W2. When I click on the ALARM button, the label changes from 
OFF to ON.

3. But when I test it by transmitting into a 'wrong' antenna (SWR=13:1) 
it does not flash LEDs or activate the relay.

4. Firmware is 1.00 and utility program is also 1.00.

Has anyone had a similar problem?
-- 
Vic K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Re: [Elecraft] W2 Wattmeter alarm function doesn't activate on hogh SWR

[Vic Rosenthal K2VCO]

Here is a reply that I received from another fellow on the reflector. I 
followed his advice and it solved the problem (it was a direct reply so 
I won't give his name or call, but I was very grateful for his help)!


-
You have to set the alarm SWR level by using the “[“ and “]” commands 
(no quotes) in the W2 Utility program. [ lowers the SWR, ] raises it. 
The initial value in the firmware is undefined, so you have to set it 
yourself. You may have to issue multiple [ or ] commands to get a valid 
response from the W2. This is a known firmware bug which is being worked 
on, as is a few others. Another bug is that after the SWR alarm trips, 
you have to push the “sensor” button multiple times to get the W2 to 
reset, but if you have set PWR (serial) to PEP in the W2 GUI application 
(not utility program), it will reset after one attempt.



Note that this is done using the W2 Utility program, which is not the 
same as the W2 interface program. They are both downloadable from th 
Elecraft site.


On 12/29/2013 7:10 AM, Ken Roberson wrote:

Vic,

OK , Same here , And right when I'm setup to use that feature .

73 Ken K5DNL / WG2XXM



On Saturday, December 28, 2013 10:43 PM, Vic Rosenthal K2VCO
k2vco@gmail.com wrote:
Hello folks,

I sent this to Support, but they are probably resting up until Monday,
so I thought I would ask here. Has anyone had this problem with the W2
wattmeter?

I just assembled my unit. It seems to work correctly except that I can't
enable the alarm function.

1. When I turn the W2 on, I hear the relay click, and it does interrupt
the ptt at this point.

2. The W2 utility program (USB, running on XP) finds and communicates
with the W2. When I click on the ALARM button, the label changes from
OFF to ON.

3. But when I test it by transmitting into a 'wrong' antenna (SWR=13:1)
it does not flash LEDs or activate the relay.

4. Firmware is 1.00 and utility program is also 1.00.

Has anyone had a similar problem?
--
Vic K2VCO
Fresno CA
http://www.qsl.net/k2vco/


--
Vic K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[Elecraft] W2 Wattmeter alarm function doesn't activate on hogh SWR

[Vic Rosenthal K2VCO]

Hello folks,

I sent this to Support, but they are probably resting up until Monday, 
so I thought I would ask here. Has anyone had this problem with the W2 
wattmeter?


I just assembled my unit. It seems to work correctly except that I can't 
enable the alarm function.


1. When I turn the W2 on, I hear the relay click, and it does interrupt 
the ptt at this point.


2. The W2 utility program (USB, running on XP) finds and communicates 
with the W2. When I click on the ALARM button, the label changes from 
OFF to ON.


3. But when I test it by transmitting into a 'wrong' antenna (SWR=13:1) 
it does not flash LEDs or activate the relay.


4. Firmware is 1.00 and utility program is also 1.00.

Has anyone had a similar problem?
--
Vic K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Re: [Elecraft] W2 Wattmeter idea

[Fred Smith]

I use an Alpha 4510 Power/SWR Meter and it does have a power
delivered/forward setting just for that. That setting takes all of these
factors into consideration for the final product it reads from .03-3000w.
That is the reason for my trusted Oak Hills Research WM-2 QRP wattmeter
still in line for my KX3.


73,
Fred/N0AZZ
K3 Ser # 6730--KX3 # 5210--K2/100 # 6470-KAT100
P3/SVGA--KAT500--W2
Amps Elecraft KPA500 HF/6m--Alpha's 9500 HF--87A HF--Mirage B-5030-G
300+w--(2) B-5016-G's 165w 2m

 

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Vic Rosenthal K2VCO
Sent: Tuesday, December 24, 2013 8:08 PM
To: Elecraft Reflector
Subject: [Elecraft] W2 Wattmeter idea

I just ordered a W2 wattmeter, haven't received it yet, and I already want
to change something!

It displays forward power and SWR. When the SWR is 1:1, then the power
output of the transmitter is equal to the forward power. But when it is
greater than 1:1, then the actual power output is the forward power LESS the
reflected power.

I would like an option to display this output power, forward less reflected.
This could probably be done in the firmware, a SMOP as Wayne likes to say.

I realize that this does not tell you the power delivered to the antenna,
for which you would need to know the line loss. But it is still a more
useful indication than just the forward power.

--
Vic K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Re: [Elecraft] W2 Wattmeter idea

[Milan Gütter, OK7GU]

Dr Vic,

Iam using K2 and LP-100A Wattmeter for my remotely controlled station, 
both works fine.

The K2 accuracy for SWR upto 2 is enough good (10%).

If you need more sophisticated Wattmeter, use the LP-100A.
http://www.telepostinc.com/lp100.html

LP-100A can indicate the pure FWD power. And many other parameters.

73, MX and HNY2014

Milan, OK7GU
www.ok7gu.com







--

Message: 3
Date: Tue, 24 Dec 2013 18:08:17 -0800
From: Vic Rosenthal K2VCO k2vco@gmail.com
To: Elecraft Reflector elecraft@mailman.qth.net
Subject: [Elecraft] W2 Wattmeter idea
Message-ID: 52ba3e11.7060...@gmail.com
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I just ordered a W2 wattmeter, haven't received it yet, and I already
want to change something!

It displays forward power and SWR. When the SWR is 1:1, then the power
output of the transmitter is equal to the forward power. But when it is
greater than 1:1, then the actual power output is the forward power LESS
the reflected power.

I would like an option to display this output power, forward less
reflected. This could probably be done in the firmware, a SMOP as
Wayne likes to say.

I realize that this does not tell you the power delivered to the
antenna, for which you would need to know the line loss. But it is still
a more useful indication than just the forward power.



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Re: [Elecraft] W2 Wattmeter idea

[kd7gc]

For what it might be worth, my Power Master 2 from Array Solutions has an
option called Net Power that does exactly what you want.

 

73

KD7GC

 

 

Alan R. Downing

Phoenix, AZ

 

From: Vic K2VCO-2 [via Elecraft]
[mailto:ml-node+s365791n7582024...@n2.nabble.com] 
Sent: Tuesday, December 24, 2013 7:09 PM
To: kd7gc
Subject: W2 Wattmeter idea

 

I just ordered a W2 wattmeter, haven't received it yet, and I already 
want to change something! 

It displays forward power and SWR. When the SWR is 1:1, then the power 
output of the transmitter is equal to the forward power. But when it is 
greater than 1:1, then the actual power output is the forward power LESS 
the reflected power. 

I would like an option to display this output power, forward less 
reflected. This could probably be done in the firmware, a SMOP as 
Wayne likes to say. 

I realize that this does not tell you the power delivered to the 
antenna, for which you would need to know the line loss. But it is still 
a more useful indication than just the forward power. 

-- 
Vic K2VCO 
Fresno CA 
http://www.qsl.net/k2vco/
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[Elecraft] W2 Wattmeter idea

[Vic Rosenthal K2VCO]

I just ordered a W2 wattmeter, haven't received it yet, and I already 
want to change something!


It displays forward power and SWR. When the SWR is 1:1, then the power 
output of the transmitter is equal to the forward power. But when it is 
greater than 1:1, then the actual power output is the forward power LESS 
the reflected power.


I would like an option to display this output power, forward less 
reflected. This could probably be done in the firmware, a SMOP as 
Wayne likes to say.


I realize that this does not tell you the power delivered to the 
antenna, for which you would need to know the line loss. But it is still 
a more useful indication than just the forward power.


--
Vic K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Re: [Elecraft] W2 wattmeter

[Fred Smith]

My W2 seems to read about as well as my Bird wattmeter from QRP to QRO is it
as good as a Oak Hills Research's QRP WM-2 no but few are. Is it an Alpha
4510 no but reads close to mine at a fraction of the cost.

I have mine from 1/2w -1500w without a problem for the money IMHO hard to
beat and I have 7-8 around here. It's a keeper for sure right now it's
monitoring my K2 and KX3 I have 2 sensors.


73,
Fred/N0AZZ
K3 Ser #'s 6730/5299--KX3 # 2573--K2/100--KAT100
P3/SVGA--KPA500--KAT500--W2




-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Stephen Selberg
Sent: Friday, June 14, 2013 11:49 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] W2 wattmeter

Greetings,

Thinking of picking up the W2 wattmeter to go in the shack with the rest of
my gear (and future K3 and KPA500some day). I was reading the reviews on
eham, but still had a few questions I didn't see there.

I was curious about the accuracy of the meter and how well the peak hold
function works. I've played with other meters where the peak hold didn't
play well. Any input would be great.

Thanks and 73,

Steve KS6PD

KX3 #3604
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Version: 2013.0.2904 / Virus Database: 3199/6412 - Release Date: 06/14/13

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Re: [Elecraft] W2 wattmeter

[Goldtr8 (KD8NNU)]

Mine works great and comparing readings to my other equipment it appears 
spot on.   From barefoot low power on the k3 to my amp on.   I use the peak 
function all the time as I do a lot of SSB and it just makes me feel good.


I have the 2kw sensor.

It also helped me on 6m as I was running the k3 at 80 watts and only reading 
50w peak on the w2.   After removing all the stuff between the k3 and the w2 
(amp  anc) I got my whole 80w at the w2 sensor.   So it showed me a 30w 
loss in the system on 6m so that to me is pretty accurate.


Cheers  Beers
~73
Don
KD8NNU
-.- -.. ---.. -. -. ..-
-Original Message- 
From: Stephen Selberg

Sent: Saturday, June 15, 2013 12:48 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] W2 wattmeter

Greetings,

Thinking of picking up the W2 wattmeter to go in the shack with the rest of
my gear (and future K3 and KPA500some day). I was reading the reviews on
eham, but still had a few questions I didn't see there.

I was curious about the accuracy of the meter and how well the peak hold
function works. I've played with other meters where the peak hold didn't
play well. Any input would be great.

Thanks and 73,

Steve KS6PD

KX3 #3604
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Re: [Elecraft] W2 wattmeter

[NZ0T]

Very happy with my W2.  I have the 2KW coupler.  Seems pretty accurate and
the LED display is great for casual use.  I don't always keep the display up
on the computer but it's very useful when greater resolution than the LED
display is desired.

73 Bill NZ0T



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Re: [Elecraft] W2 wattmeter

[Fred Smith]

Bill is 100% right on about the W2,it is most useful on screen for extreme
QRP if you don't have a WM-2 QRP meter. But like I said earlier it is very
close for all ranges both of my couplers are 2k's but still not bad for QRP.


73,
Fred/N0AZZ
K3 Ser #'s 6730/5299--KX3 # 2573--K2/100 # 6470-KAT100
P3/SVGA--KPA500--KAT500--W2



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of NZ0T
Sent: Saturday, June 15, 2013 7:16 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] W2 wattmeter

Very happy with my W2.  I have the 2KW coupler.  Seems pretty accurate and
the LED display is great for casual use.  I don't always keep the display up
on the computer but it's very useful when greater resolution than the LED
display is desired.

73 Bill NZ0T



--
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Re: [Elecraft] W2 wattmeter

[Donald Butler]

I have two W2 meters and I like them  .. But I do not rely upon them for
accurate power readings.. My more practical use is to use my peripheral
vision to keep tabs on what's going on while I'm on the air and be alert for
unexpected changes.

I think the Bird 43, when fully calibrated, claims plus or minus 5% accuracy
at full scale on their analog dial.

The W2 is probably close to that, but not quite (maybe 6% at best) ... there
are 17 leds on the 0-20 watt meter scale  .. Doing the math, on the 2KW
scale, that's about 118 watts per LED ... so the power has to increase about
118 watts before the next LED will light up, etc., etc.Yes, you can get
a reading of presumed accuracy to the nearest watt if you us the W2 software
and keep a window running on your computer  . but the LED display itself is
only capable of reading plus or minus 118 of actual wattage on the 2 KW
scale.. And I've never bothered to calibrate to see what it takes for the
next LED to light up .. Does it change when you (1) just cross the new
threshold, (2) hit the midrange area of the next step, or (3) go the full
distance.Bottom line, it really doesn't matter, but I do not use a W2 to
obtain accurate power readings just from the LED display.

Don, N5LZ

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred Smith
Sent: Saturday, June 15, 2013 8:28 AM
To: 'NZ0T'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] W2 wattmeter

Bill is 100% right on about the W2,it is most useful on screen for extreme
QRP if you don't have a WM-2 QRP meter. But like I said earlier it is very
close for all ranges both of my couplers are 2k's but still not bad for QRP.


73,
Fred/N0AZZ
K3 Ser #'s 6730/5299--KX3 # 2573--K2/100 # 6470-KAT100
P3/SVGA--KPA500--KAT500--W2



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of NZ0T
Sent: Saturday, June 15, 2013 7:16 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] W2 wattmeter

Very happy with my W2.  I have the 2KW coupler.  Seems pretty accurate and
the LED display is great for casual use.  I don't always keep the display up
on the computer but it's very useful when greater resolution than the LED
display is desired.

73 Bill NZ0T



--
View this message in context:
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Re: [Elecraft] W2 wattmeter

[Stephen Selberg]

Thanks for all the feed back! Looks like I'll be taking the 30 minute drive
to Watsonville this week.

Steve KS6PD

On Saturday, June 15, 2013, Donald Butler wrote:

 I have two W2 meters and I like them  .. But I do not rely upon them for
 accurate power readings.. My more practical use is to use my peripheral
 vision to keep tabs on what's going on while I'm on the air and be alert
 for
 unexpected changes.

 I think the Bird 43, when fully calibrated, claims plus or minus 5%
 accuracy
 at full scale on their analog dial.

 The W2 is probably close to that, but not quite (maybe 6% at best) ...
 there
 are 17 leds on the 0-20 watt meter scale  .. Doing the math, on the 2KW
 scale, that's about 118 watts per LED ... so the power has to increase
 about
 118 watts before the next LED will light up, etc., etc.Yes, you can get
 a reading of presumed accuracy to the nearest watt if you us the W2
 software
 and keep a window running on your computer  . but the LED display itself is
 only capable of reading plus or minus 118 of actual wattage on the 2 KW
 scale.. And I've never bothered to calibrate to see what it takes for the
 next LED to light up .. Does it change when you (1) just cross the new
 threshold, (2) hit the midrange area of the next step, or (3) go the full
 distance.Bottom line, it really doesn't matter, but I do not use a W2
 to
 obtain accurate power readings just from the LED display.

 Don, N5LZ

 -Original Message-
 From: elecraft-boun...@mailman.qth.net javascript:;
 [mailto:elecraft-boun...@mailman.qth.net javascript:;] On Behalf Of
 Fred Smith
 Sent: Saturday, June 15, 2013 8:28 AM
 To: 'NZ0T'; elecraft@mailman.qth.net javascript:;
 Subject: Re: [Elecraft] W2 wattmeter

 Bill is 100% right on about the W2,it is most useful on screen for extreme
 QRP if you don't have a WM-2 QRP meter. But like I said earlier it is very
 close for all ranges both of my couplers are 2k's but still not bad for
 QRP.


 73,
 Fred/N0AZZ
 K3 Ser #'s 6730/5299--KX3 # 2573--K2/100 # 6470-KAT100
 P3/SVGA--KPA500--KAT500--W2



 -Original Message-
 From: elecraft-boun...@mailman.qth.net javascript:;
 [mailto:elecraft-boun...@mailman.qth.net javascript:;] On Behalf Of NZ0T
 Sent: Saturday, June 15, 2013 7:16 AM
 To: elecraft@mailman.qth.net javascript:;
 Subject: Re: [Elecraft] W2 wattmeter

 Very happy with my W2.  I have the 2KW coupler.  Seems pretty accurate and
 the LED display is great for casual use.  I don't always keep the display
 up
 on the computer but it's very useful when greater resolution than the LED
 display is desired.

 73 Bill NZ0T



 --
 View this message in context:
 http://elecraft.365791.n2.nabble.com/W2-wattmeter-tp7575272p7575286.html
 Sent from the Elecraft mailing list archive at Nabble.com.
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 Checked by AVG - www.avg.com
 Version: 2013.0.2904 / Virus Database: 3199/6413 - Release Date: 06/15/13

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Re: [Elecraft] W2 wattmeter

[Ron D'Eau Claire]

The W2 is great, but of marginal use for someone who has a rig with an ATU
built in. 

Indeed, one of the reoccurring mistakes Hams make is to put the external W2
between the rig and the antenna and then wonder why it shows a high SWR when
the internal ATU reports 1:1. 

The W2 or any watt/SWR meter must go between the transmitter and the antenna
matching network (ATU, etc.). Rigs like the K1, K2, KX1 and KX3 with built
in tuners do not offer a way to do that. 

The W2 and W1 are handy for checking the SWR on a 50-ohm coaxial antenna
feed line. That's best done with the meter at the antenna end of the feed
line, but a general idea of how well matched the antenna is to the feed line
can be had by monitoring the SWR at the rig end. 

It can also alert you to any unexpected changes in the antenna if you make a
note of the indicated SWR on each band. Any significant change in that SWR
indicates a significant change in the antenna, usually not for the best, Hi!


73 Ron AC7AC

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of NZ0T
Sent: Saturday, June 15, 2013 5:16 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] W2 wattmeter

Very happy with my W2.  I have the 2KW coupler.  Seems pretty accurate and
the LED display is great for casual use.  I don't always keep the display up
on the computer but it's very useful when greater resolution than the LED
display is desired.

73 Bill NZ0T


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Re: [Elecraft] W2 wattmeter

[John Marvin]

As you mentioned, the W2 utility shows greater accuracy, although just 
because it shows values in fractions of a watt, it doesn't mean that it 
is that accurate. However, the nice thing about the W2 is that it has a 
fairly nice calibration facility. So if you have or can borrow a higher 
accuracy meter then you can use that to improve the accuracy of the W2.


Also, I really like the fact that the SWR bridge sensor is remote from 
the unit. This allows a lot more flexibility for setup. In my case the 
cable was just a little too short, but I wondered if a CAT 5e patch 
cable would work. I did a little googling and saw an Elecraft employee 
recommending that option. I don't know how long you can go before it 
doesn't work or gives bad readings, but the patch cable I used was only 
2-3 feet longer than the cable supplied by Elecraft, and it didn't 
appear to affect the readings based on a simple before/after test.


Anyway, I think the W2 is a great product.  However, Elecraft recommends 
that it go between the amp and the ATU (Elecraft says that the accuracy 
really starts to suffer with high SWR). That means that it might not be 
very useful if I purchase a KXPA100 with the built in ATU.


John
AC0ZG

On 6/15/2013 9:34 AM, Donald Butler wrote:

I have two W2 meters and I like them  .. But I do not rely upon them for
accurate power readings.. My more practical use is to use my peripheral
vision to keep tabs on what's going on while I'm on the air and be alert for
unexpected changes.

I think the Bird 43, when fully calibrated, claims plus or minus 5% accuracy
at full scale on their analog dial.

The W2 is probably close to that, but not quite (maybe 6% at best) ... there
are 17 leds on the 0-20 watt meter scale  .. Doing the math, on the 2KW
scale, that's about 118 watts per LED ... so the power has to increase about
118 watts before the next LED will light up, etc., etc.Yes, you can get
a reading of presumed accuracy to the nearest watt if you us the W2 software
and keep a window running on your computer  . but the LED display itself is
only capable of reading plus or minus 118 of actual wattage on the 2 KW
scale.. And I've never bothered to calibrate to see what it takes for the
next LED to light up .. Does it change when you (1) just cross the new
threshold, (2) hit the midrange area of the next step, or (3) go the full
distance.Bottom line, it really doesn't matter, but I do not use a W2 to
obtain accurate power readings just from the LED display.

Don, N5LZ

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred Smith
Sent: Saturday, June 15, 2013 8:28 AM
To: 'NZ0T'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] W2 wattmeter

Bill is 100% right on about the W2,it is most useful on screen for extreme
QRP if you don't have a WM-2 QRP meter. But like I said earlier it is very
close for all ranges both of my couplers are 2k's but still not bad for QRP.


73,
Fred/N0AZZ
K3 Ser #'s 6730/5299--KX3 # 2573--K2/100 # 6470-KAT100
P3/SVGA--KPA500--KAT500--W2



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of NZ0T
Sent: Saturday, June 15, 2013 7:16 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] W2 wattmeter

Very happy with my W2.  I have the 2KW coupler.  Seems pretty accurate and
the LED display is great for casual use.  I don't always keep the display up
on the computer but it's very useful when greater resolution than the LED
display is desired.

73 Bill NZ0T



--
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Checked by AVG - www.avg.com
Version: 2013.0.2904 / Virus Database: 3199/6413 - Release Date: 06/15/13

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[Elecraft] W2 wattmeter

[Stephen Selberg]

Greetings,

Thinking of picking up the W2 wattmeter to go in the shack with the rest of
my gear (and future K3 and KPA500some day). I was reading the reviews on
eham, but still had a few questions I didn't see there.

I was curious about the accuracy of the meter and how well the peak hold
function works. I've played with other meters where the peak hold didn't
play well. Any input would be great.

Thanks and 73,

Steve KS6PD

KX3 #3604
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[Elecraft] Elecraft W2 wattmeter with 3 sensors for sale

[NZ8J]

I have an excellent condition Elecraft W2 wattmeter with the 200 and
2000 watt 1.8-54 mhz sensors and the 200 watt 144-450 mhz sensor.
It all looks and works good with the remote cable, power cable and
manual. 

I'll ship and insure it in the US for $325

US Postal Money order or possibly Paypal.

Thanks 
Tim
NZ8J
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[Elecraft] W2 Wattmeter accuracy at low power

[jeffrey741]

I am looking for information regarding the accuracy of the W2 at low power.
Does anyone know if the W2 can measure in the 1-10 mW range (assuming the
reading are taken from the serial interface) for example with the 200W VHF
sensor? Is the W2 accurate at these power levels? Also can the W2 (with VHF
sensor) be used to measure below 144MHz with reasonable accuracy. I am
guessing not but just wanted to see if anyone has explored using this meter
to make measurements in the 100-118MHz range.



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View this message in context: 
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Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] W2 Wattmeter accuracy at low power

[Robert Friess]

The W2 cannot measure power in the 1-10mw range.

The sensors are calibrated at 144 and 460 MHz.  They will certainly work in
the 100-118MHz range but the accuracy is unknown.

Bob, N6CM

On Wed, Dec 26, 2012 at 1:47 PM, jeffrey741 jfedi...@alum.rpi.edu wrote:

 I am looking for information regarding the accuracy of the W2 at low power.
 Does anyone know if the W2 can measure in the 1-10 mW range (assuming the
 reading are taken from the serial interface) for example with the 200W VHF
 sensor? Is the W2 accurate at these power levels? Also can the W2 (with VHF
 sensor) be used to measure below 144MHz with reasonable accuracy. I am
 guessing not but just wanted to see if anyone has explored using this meter
 to make measurements in the 100-118MHz range.



 --
 View this message in context:
 http://elecraft.365791.n2.nabble.com/W2-Wattmeter-accuracy-at-low-power-tp7567724.html
 Sent from the Elecraft mailing list archive at Nabble.com.
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[Elecraft] Want to Buy: Elecraft W2 Wattmeter

[David Inger]

Hello to all,
 
Does anyone out there have a W2 wattmeter that is excess to their needs and
willing to sell?  If so, please contact me off-reflector at
ingerassocia...@cox.net.
 
Tnx es 73 de K6SBA
David in Santa Barbara, CA
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[Elecraft] W2 Wattmeter for sale

[Mike Short]

Two couplers, DCHF-2000 2KW HF and DCV/U-200a V/UHF coupler.

$275 OBO shipped

Mike
AI4NS
mike.sh...@mchsi.com
8505546532
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[Elecraft] Plotter graph software for the Elecraft W2 Wattmeter.

[Martin Storli - LA8OKA]

Hi 
 
I have the W2 Watt meter, it's of course hooked up to my computer so that I can 
read the data on the W2 Utility Software.
The software is quite good, simple and informative user interface, but I miss 
one functionality, namely a plotter graph function that can plot the PEP values 
on a graph while transmitting.
Such plots are useful for analyzing transmitted power.
If there are someone on this list that is capable of making such a software I 
think it would be a huge success.
Even better will be if it could be integrated in the already existing W2 
Utility Software.
The W2 serial commands are described here: 
http://www.elecraft.com/manual/Elecraft_W2_Serial_Interface_Commands_Rev_D.pdf
Other functions on the wish list for such a software would be two sliders that 
can be moved around on the plot for reading of values and for calculations of 
the average power.

Are there anyone on the list that's up for the challenge?

Best regards,

Martin Storli 
LA8OKA
Oslo, Norway 
 
ARCTICPEAK's Radio pages! 
http://www.arcticpeak.com/radio.htm
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[Elecraft] W2 Wattmeter issues

[Mike Short]

Used the W2 with my K3/P3 on field day. Other radios were causing the
SWR LEDs to all light up. I was connected to a hexbeam at 35 feet, and
rest were dipoles lower, using 100W. Any ideas on why, other than a lot
of RF flying around? Bands did not seem to matter.

Mike
AI4NS

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Re: [Elecraft] W2 Wattmeter issues

[Ken - K0PP]

Hi Mike,

This is normal. The W2 is merely indicating RF on the 
center conductor of its sensor, just as it does in normal 
usage.  It's more pronounced on the W2 because of it's
ability to respond to really low levels of RF.  

Mine does the same thing on several bands and antennas,
depending on which is connected to what.   BTW, a set of
Bird meters connected to a dual sensor exhibit the same
behavior, but it isn't as obvious because the lowest range
they can display is 50W FS.

73!
Ken Kopp - K0PP 
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Re: [Elecraft] W2 wattmeter in SO2R

[K5WA]

Eric, 

 

Yes, I am at FW Rev. 1.0.

 

Bob K5WA

 

 

Message: 5

Date: Wed, 25 Aug 2010 09:31:25 -0700

From: Eric Swartz - WA6HHQ, Elecraft e...@elecraft.com

Subject: Re: [Elecraft] W2 wattmeter in SO2R

To: Bill K9YEQ k9...@live.com

Cc: 'Elecraft reflector' elecraft@mailman.qth.net

Message-ID: 4c75455d.6010...@elecraft.com

Content-Type: text/plain; charset=ISO-8859-1; format=flowed

 

  We changed the autodetect timing in later W2 firmware releases to dela 

with SO2R use. Check to make sure you have the latest f/w loaded in the W2.

See:  http://www.elecraft.com/software/W2/elecraft_w2_software.htm

 

73, Eric

 

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[Elecraft] W2 wattmeter in SO2R

[K5WA]

My W2 has a pair of 2 KW sensors which I run in the automatic sensor
switching mode.  This way, I don't have to flip any switches as I alternate
between each rig of my SO2R setup.  I am seeing erratic readings in the
automatic sensor switching mode that I am not seeing if I manually throw the
sensor switch to S1 or S2.  From this result, I am concluding that my sensor
hook up is RF sound and the fault must be in the automatic switching
algorithm of the W2.  I get the same erratic readings on the W2 as well as
the W2 software interface application.

 

Is anyone else seeing this behavior?

 

Thanks,

Bob K5WA

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Re: [Elecraft] W2 wattmeter in SO2R

[Bill K9YEQ]

I was experiencing some erratic behavior, could have been a power
interruption issue.  I reloaded the firmwar; fixed! ( I have 2 sensors as
well, one high power HF and the VHF.)

Bill
K9YEQ


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of K5WA


My W2 has a pair of 2 KW sensors which I run in the automatic sensor
switching mode.  This way, I don't have to flip any switches as I alternate
between each rig of my SO2R setup.  I am seeing erratic readings in the
automatic sensor switching mode that I am not seeing if I manually throw the
sensor switch to S1 or S2.  From this result, I am concluding that my sensor
hook up is RF sound and the fault must be in the automatic switching
algorithm of the W2.  I get the same erratic readings on the W2 as well as
the W2 software interface application.

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Re: [Elecraft] W2 wattmeter in SO2R

[Eric Swartz - WA6HHQ, Elecraft]

  We changed the autodetect timing in later W2 firmware releases to dela 
with SO2R use. Check to make sure you have the latest f/w loaded in the W2.
See:  http://www.elecraft.com/software/W2/elecraft_w2_software.htm

73, Eric


On 8/25/2010 9:21 AM, Bill K9YEQ wrote:
 I was experiencing some erratic behavior, could have been a power
 interruption issue.  I reloaded the firmwar; fixed! ( I have 2 sensors as
 well, one high power HF and the VHF.)

 Bill
 K9YEQ

 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of K5WA


 My W2 has a pair of 2 KW sensors which I run in the automatic sensor
 switching mode.  This way, I don't have to flip any switches as I alternate
 between each rig of my SO2R setup.  I am seeing erratic readings in the
 automatic sensor switching mode that I am not seeing if I manually throw the
 sensor switch to S1 or S2.  From this result, I am concluding that my sensor
 hook up is RF sound and the fault must be in the automatic switching
 algorithm of the W2.  I get the same erratic readings on the W2 as well as
 the W2 software interface application.

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Re: [Elecraft] W2 wattmeter in SO2R

[Bill K9YEQ]

Eric,

Thanks.  I have the latest.  It only happened once.  I don't recall the
specific circumstances to my issue, it did occur after the update, once, and
has not happened since.  My only issue now is that I have no where to plug
it into power, need to run the fabulous P3!  Will get some adapters today.

Bill
K9YEQ
K2 and KX1 field tester, K3 and modules

-Original Message-
From: Eric Swartz - WA6HHQ, Elecraft [mailto:e...@elecraft.com] 
Sent: Wednesday, August 25, 2010 11:31 AM
To: Bill K9YEQ
Cc: 'Elecraft reflector'
Subject: Re: [Elecraft] W2 wattmeter in SO2R

  We changed the autodetect timing in later W2 firmware releases to dela
with SO2R use. Check to make sure you have the latest f/w loaded in the W2.
See:  http://www.elecraft.com/software/W2/elecraft_w2_software.htm

73, Eric


On 8/25/2010 9:21 AM, Bill K9YEQ wrote:
 I was experiencing some erratic behavior, could have been a power 
 interruption issue.  I reloaded the firmwar; fixed! ( I have 2 sensors 
 as well, one high power HF and the VHF.)

 Bill
 K9YEQ

 -Original Message-
 From: elecraft-boun...@mailman.qth.net 
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of K5WA


 My W2 has a pair of 2 KW sensors which I run in the automatic sensor 
 switching mode.  This way, I don't have to flip any switches as I 
 alternate between each rig of my SO2R setup.  I am seeing erratic 
 readings in the automatic sensor switching mode that I am not seeing 
 if I manually throw the sensor switch to S1 or S2.  From this result, 
 I am concluding that my sensor hook up is RF sound and the fault must 
 be in the automatic switching algorithm of the W2.  I get the same 
 erratic readings on the W2 as well as the W2 software interface
application.


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Re: [Elecraft] W2 Wattmeter Review

[Bill K9YEQ]

Don, 

The greatest reasons for buying Elecraft are:

Great bunch of people.
If you jump in early on a new piece of equipment you won't be
abandoned with no   updates. You can update the
equipment, just like the latest release.
The service is better than anything I have experience and others
should take notice.
If you have an issue, you will find a cure.  
My Wattmeter had an issue.  Two days later, board replaced, fixed.
They even   included the return label and postage for
the defective board.  (Love the Elecraft. Some
called it Mojo.)
Did I mention: Great bunch of people.

Bill
K9YEQ


-Original Message-


I just read the W2 wattmeter review in the upcoming July, 2010 QST on the
member's only pages.  Very good read and once again pointed out the
excellent customer service we take for granted from Elecraft.  Every
negative in the intitial review had already been fixed by firmware updates
when the author finally took the time to look.  The only one found later was
quickly fixed with an update from Elecraft when he reported it.  Try that
with the other manufacturers!!
73,
Don, WB5HAK
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[Elecraft] W2 Wattmeter Review

[Don Cunningham]

I just read the W2 wattmeter review in the upcoming July, 2010 QST on the 
member's only pages.  Very good read and once again pointed out the excellent 
customer service we take for granted from Elecraft.  Every negative in the 
intitial review had already been fixed by firmware updates when the author 
finally took the time to look.  The only one found later was quickly fixed with 
an update from Elecraft when he reported it.  Try that with the other 
manufacturers!!
73,
Don, WB5HAK
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[Elecraft] W2 Wattmeter question

[dalej]

Hi,

I don't post here much so I hope I'm doing this right.

I have a W2 wattmeter coming, it'll be here Friday, it looks to be a  
very good value as all Elecraft products are and will match my K3  
beautifully.  I will have the vhf/uhf sensor along with the HF  
sensor.  I'm wondering if the vhf/uhf coupler might be useable on 1.2  
Ghz?  I realize the accuracy won't be too good, but by how much, any  
estimates or guess?

73
Dale k9vuj

P.S.  I am very pleased that Elecraft has chosen to support the Apple  
computer platform along with Windows and Linux.  I have downloaded and  
installed the supporting OSX applications for the W2 already. 
  
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Re: [Elecraft] W2 Wattmeter question

[David Ferrington, M0XDF]

I didn't know they did that now for W2 - very good.
Helps that Wayne is an i Mac/Pad/Phone user I guess ;-)
73 de M0XDF, K3 #174
-- 
Being a System Administrator is like being a plumber.
If you do a good job, nobody knows. If you screw up, everybody gets covered in 
s**t!

On 17 May 2010, at 11:38, dalej wrote:

 P.S.  I am very pleased that Elecraft has chosen to support the Apple  
 computer platform along with Windows and Linux.  I have downloaded and  
 installed the supporting OSX applications for the W2 already. 

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Re: [Elecraft] W2 Wattmeter question

[Robert Friess]

Hi Dale,

I designed the couplers for the W2 and have not tested the VHF/UHF coupler
at 1.2GHz.  However, I would expect very poor performance at that frequency.
 It is far outside the design range.

Bob, N6CM

On Mon, May 17, 2010 at 3:38 AM, dalej dal...@mac.com wrote:

 Hi,

 I don't post here much so I hope I'm doing this right.

 I have a W2 wattmeter coming, it'll be here Friday, it looks to be a
 very good value as all Elecraft products are and will match my K3
 beautifully.  I will have the vhf/uhf sensor along with the HF
 sensor.  I'm wondering if the vhf/uhf coupler might be useable on 1.2
 Ghz?  I realize the accuracy won't be too good, but by how much, any
 estimates or guess?

 73
 Dale k9vuj

 P.S.  I am very pleased that Elecraft has chosen to support the Apple
 computer platform along with Windows and Linux.  I have downloaded and
 installed the supporting OSX applications for the W2 already.

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[Elecraft] W2 Wattmeter wish - Additional

[Ken Kopp]

I failed to mention that Array Solutions -does- make 
a wattmeter that likely meets your needs.  It's their
PowerMaster model, which you can view on their
website.

73! Ken Kopp - K0PP
  elecraftcov...@rfwave.net
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Re: [Elecraft] W2 Wattmeter wish

[Brett Howard]

Larry Phipps at Telepost inc also makes the LP-100A that does just what
you want as well...

You get a two line display with a VFT display that is very high
contrast.  You get one line for power and one for SWR.  You can also
change that to be FWD and REF power if you want.  You also get a LOT
more for your money on that in that you can get at all the phase
information as well.  If you're willing to hook it up to a computer you
can get a full smith plot of your antennas.

Its also quite inexpensive and comes in a full up solder together kit if
you wish.

~Brett (KC7OTG)

On Sun, 2010-02-21 at 22:14 -0500, k2zls wrote:
 It looks like the W2 is well on its way, but I just wanted to 
 present my case why I can't buy one.  The display is just not presented 
 accurately enough for me.   It takes a computer link to present the info 
 in detail and thats not what I envision doing.  It seems that the info 
 is there in the box almost down to the watt, but you can't be sure what 
 your power is squinting at a bar graph to tell you that you are 
 somewhere within 100 watts of your target. To my way of thinking it's 
 only relative info. Not good for me.
 
Here's what I would think would be a KILLER that I would buy in a 
 minute.  I would like to see  two windows of  7-segment GREEN LEDS. 
 (Thats 4 characters )  to display the forward power and another 
 window to display the SWR. (X.XX)  These LEDs would be large enough to 
 read across the room.  I would then buy two directional couplers.  A low 
 power at 200 watts is more than enough for the input side of the QRO AMP 
 and another for the output side at 2500 watts.   That way both sides of 
 the AMP can be monitored with  just one press of the sensor switch.  
 But, thats something you can already do with the current configuration.
 
The real deal is observing the actual power out of the amp and SWR.  
 The current bar graph would supplement these windows and provide and 
 easy way to see the trends while tuning.  There are other units out 
 there that are, perhaps,  more accurate and even present FREQ readouts,  
 but the main problem with these is all the info is cluttered on one 
 screen which is hard to decipher.  I like the W2 format but,  it just 
 needs to be taken to another level.  LEDs would really standout and 
 should be able to present the info as accurate as the computer.
 
Thanks ELECRAFT  and I hope it continues to keep getting better.
 
 73  Tony   K2ZLS
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[Elecraft] W2 Wattmeter wish

[k2zls]

Ken,

   Thanks for the heads up, but I've already been researching and here's 
what I've found.  The LP-100a with dual standard 3K couplers comes in at 
around $660  assembled and calibrated.  It's worth the extra money for 
me to have everything done and not have to send it back for fixing and 
calibration. The PowerMaster already assembled and tested with 2nd 
coupler option at $670.  Both units are outstanding and its hard to 
choose between them.  What really got me going on this is the Alpha 4510 
watt meter ($945).  Just look at the LED display only and visualize a 
display like that on the W2 and you will see what I mean. It's awesome.  
The 7-segment displays come in all sizes and colors.  Just take a look 
at the average digital clock on your nightstand.  Same thing.

   But,  my thinking is that the W2 with 2 couplers, (200 standard)  and 
2000 watt come in at about $330.  How much more do you think ELECRAFT 
would have to spend to come up with an updated display.  Maybe change 
box size and re-arrange the display, but still keeping the current 
configuration intact.  At only half the cost of it's competition, it 
leaves a lot of headroom for development and profit.

   I would like to see a comment or two from ELECRAFT regarding 
feasibility.  It would make all the difference in the world especially 
if it could be an upgrade or add-on to the existing unit.

73  Tony  K2ZLSELECRAFT  ROCKS
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Re: [Elecraft] W2 Wattmeter wish

[Brett Howard]

Its only $465 for an LP-100A if you build it yourself... and its plenty
accurate if you just use it out of the box.  You can even calibrate it
yourself if you've got a few dummy loads.

~Brett

On Mon, 2010-02-22 at 20:54 -0500, k2zls wrote:
 Ken,
 
Thanks for the heads up, but I've already been researching and
 here's 
 what I've found.  The LP-100a with dual standard 3K couplers comes in
 at 
 around $660  assembled and calibrated.  It's worth the extra money
 for 
 me to have everything done and not have to send it back for fixing
 and 
 calibration. The PowerMaster already assembled and tested with 2nd 
 coupler option at $670.  Both units are outstanding and its hard to 
 choose between them.  What really got me going on this is the Alpha
 4510 
 watt meter ($945).  Just look at the LED display only and visualize a 
 display like that on the W2 and you will see what I mean. It's
 awesome.  
 The 7-segment displays come in all sizes and colors.  Just take a
 look 
 at the average digital clock on your nightstand.  Same thing.
 
But,  my thinking is that the W2 with 2 couplers, (200 standard)
 and 
 2000 watt come in at about $330.  How much more do you think ELECRAFT 
 would have to spend to come up with an updated display.  Maybe change 
 box size and re-arrange the display, but still keeping the current 
 configuration intact.  At only half the cost of it's competition, it 
 leaves a lot of headroom for development and profit.
 
I would like to see a comment or two from ELECRAFT regarding 
 feasibility.  It would make all the difference in the world
 especially 
 if it could be an upgrade or add-on to the existing unit.
 
 

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[Elecraft] W2 Wattmeter wish

[k2zls]

 It looks like the W2 is well on its way, but I just wanted to 
present my case why I can't buy one.  The display is just not presented 
accurately enough for me.   It takes a computer link to present the info 
in detail and thats not what I envision doing.  It seems that the info 
is there in the box almost down to the watt, but you can't be sure what 
your power is squinting at a bar graph to tell you that you are 
somewhere within 100 watts of your target. To my way of thinking it's 
only relative info. Not good for me.

   Here's what I would think would be a KILLER that I would buy in a 
minute.  I would like to see  two windows of  7-segment GREEN LEDS. 
(Thats 4 characters )  to display the forward power and another 
window to display the SWR. (X.XX)  These LEDs would be large enough to 
read across the room.  I would then buy two directional couplers.  A low 
power at 200 watts is more than enough for the input side of the QRO AMP 
and another for the output side at 2500 watts.   That way both sides of 
the AMP can be monitored with  just one press of the sensor switch.  
But, thats something you can already do with the current configuration.

   The real deal is observing the actual power out of the amp and SWR.  
The current bar graph would supplement these windows and provide and 
easy way to see the trends while tuning.  There are other units out 
there that are, perhaps,  more accurate and even present FREQ readouts,  
but the main problem with these is all the info is cluttered on one 
screen which is hard to decipher.  I like the W2 format but,  it just 
needs to be taken to another level.  LEDs would really standout and 
should be able to present the info as accurate as the computer.

   Thanks ELECRAFT  and I hope it continues to keep getting better.

73  Tony   K2ZLS
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[Elecraft] W2 Wattmeter wish

[Ken Kopp]

Hello Tony,

I have a W2 and I'm really pleased with it and the accuracy
of the readings.

I'm fussy ... probably too much so ... about power readings
and have satisfied myself that the W2 display is -at least-
as accurate as the two Bird meters that are permanently
installed in my station.

I have a low-power sensor on the output of my K3 and a
high-power sensor on the output of my PA, which allows
me to read the power of either / both units.

I find that ... regardless of power level ... the LED for a
given power agrees with the Birds at the point where it
just illuminates.

The SWR LED display is especially handy when tuning an
antenna tuner for minimum reflected power.

I don't think one can ask for better accuracy than this from 
any power meter likely to be found in the average amateur 
station. 5 - 10% of full-scale is considered accurate in the
wattmeter world.

73! Ken Kopp - K0PP
 elecraftcov...@rfwave.net
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Re: [Elecraft] W2 Wattmeter

[Bob Naumann]

While Bird watt meters are rugged, revered and are the de-facto standard
watt meters in both commercial and amateur circles, their accuracy leaves a
lot to be desired. Unless recently calibrated, and used under specific
circumstances (ambient temperature) their use should be more properly
defined as relative output indicators. Look closely and you'll see that
their accuracy is listed as +/- some percentage of a full scale reading for
the slug you are using. With a 2500w slug, you could be hundreds of watts
off and not know it. Granted, in amateur use, absolute accuracy really does
not matter, but just keep this in mind when measuring what you see with your
W2 or any other modern digital wattmeter when compared to a Bird.

Just because they read differently, there's nearly no justification to think
the Bird is correct and your new wattmeter is not.

73,

Bob W5OV


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of NZ0T
Sent: Saturday, January 02, 2010 7:51 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] W2 Wattmeter


I'm very happy with my W2.  There was an issue with an intermittent in the
sensor cable but that was quickly resolved.  It seems accurate enough to me
on a subjective basis - I have no Bird to compare it to.  As far as
resolution goes the computer display resolution does rely on LED's and is a
continuous bar with a switchable peak indication.  This is only the 2nd
version of the diplay software and I'm sure it will continue to improve.  I
have a friend that has the LP-100A and it's a really nice meter but I'm not
sure I want to pay $120 more for it.

73 Bill NZ0T

Phil amp; Debbie Salas wrote:
 
 Those are good points about the trigger and perception of accuracy of the
 W2.  I have yet to see field test data of the W2 in regards to accuracy of

 the
 Wattmeter and SWR indications.
 
 According to the manual the W2 has an accuracy of +- 0.5dB typical
 (nothing 
 about worst-case).  This is 10-12% accuracy.  Not as good as the 
 PowerMaster/LP-100A/Telepost class of wattmeters that use NIST-traceable
 cal 
 equipment (which should get you more like 3-5% accuracy).  Of course,
 those 
 are $100-$150 more expensive than the W2.  If you use the W2 LED display, 
 your perceived error could be greater than the 10-12%.  As an example, if 
 you really have 100 watts and the W2 reads it 1/2-dB low, then possibility

 only the 80-watt LED would light.  So this would give you a 20% reading 
 error.
 
 Maybe the ARRL will do a review sometime soon.
 
 Phil - AD5X 
 
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[Elecraft] W2 Wattmeter

[KM4VX]

W2 WATTMETER I was doing some research and considering buying the Elecraft W2
for use with my 2 K-2s and read the very negative reviews of the W2's
accuracy on E-Ham. I wonder if anyone would care to refute the E-HAM reviews
or offer positive comments about the W2's accuracy. At this point I would
have to choose the AUTEK or OAK HILLS meters over the W2. Considering the
cost of the W2 and Elecraft's attention to quality I would expect a far more
accurate meter than the reviews would indicate. Many thanks.
-- 
View this message in context: 
http://n2.nabble.com/W2-Wattmeter-tp4242517p4242517.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] W2 Wattmeter

[Bill Johnson]

I have the W2 wattmeter and original production software had some issues.  
Those in most part appear to be corrected.  I do not have the lab equipment to 
measure accuracy, but suggest that when any meter is placed between tuner and 
antenna with jumpers there will be a difference no matter what meter one uses.  
I think the meter rollout was under pressure to get it to production and not 
quite ready for release.  I wouldn't be that concerned now.  I use the 1.5 kw 
module (something like that) and I monitor my 1.5KW amp to the antenna.  With 
the amp in and out of circuit, the K3 and W2 seem to be close; remember that 
jumper length, etc., will cause some difference!

 
Bill
K9YEQ
K2-#35 (2 more), KX1-#35, K3, 

 

 Date: Sat, 2 Jan 2010 05:41:01 -0800
 From: ronce...@earthlink.net
 To: elecraft@mailman.qth.net
 Subject: [Elecraft] W2 Wattmeter
 
 
 W2 WATTMETER I was doing some research and considering buying the Elecraft W2
 for use with my 2 K-2s and read the very negative reviews of the W2's
 accuracy on E-Ham. I wonder if anyone would care to refute the E-HAM reviews
 or offer positive comments about the W2's accuracy. At this point I would
 have to choose the AUTEK or OAK HILLS meters over the W2. Considering the
 cost of the W2 and Elecraft's attention to quality I would expect a far more
 accurate meter than the reviews would indicate. Many thanks.
 -- 

  
_
Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
http://clk.atdmt.com/GBL/go/171222985/direct/01/
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Re: [Elecraft] W2 Wattmeter

[Radio Amateur N5GE]

On Sat, 2 Jan 2010 05:41:01 -0800 (PST), KM4VX
ronce...@earthlink.net wrote:


W2 WATTMETER I was doing some research and considering buying the Elecraft W2
for use with my 2 K-2s and read the very negative reviews of the W2's
accuracy on E-Ham. I wonder if anyone would care to refute the E-HAM reviews
or offer positive comments about the W2's accuracy. At this point I would
have to choose the AUTEK or OAK HILLS meters over the W2. Considering the
cost of the W2 and Elecraft's attention to quality I would expect a far more
accurate meter than the reviews would indicate. Many thanks.

First let me say that I don't pay much attention to complaints about
watt meters.  Bird Model 43 watt meters are only accurate to 5% of
full scale.

Those who complain about the accuracy of any LED watt meter can be
completely ignored.  The resolution of an LED watt meter with ten LEDs
on a 2000 watt scale only has 100 watt resolution at any point on the
scale.  Hmm, that's five percent!

Those who complain about the readings they get from the software (also
subject to an accuracy specification can adjust the readings to suit
themselves via software commands using the supplied RS232 cable.

I like both of my W2's and I don't use them to make critical
adjustments.  I use them to keep an eye on what's happening between
the rig(s) and the antennae.  Did you ever try to get a good steady
SWR reading on an antenna that was moving around in a wind over 10
mph?

I wouldn't hesitate to buy another W2 if I had a use for it.

73,

Tom, N5GE

n...@n5ge.com
K3 #806 with SUB RX, K3 #1055, PR6,
XV144, XV432, KRC2,
W1, 2 W2's and other small kits

1 K144XV on order

http://www.n5ge.com
http://www.swotrc.net

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Re: [Elecraft] W2 Wattmeter

[Edward Dickinson, III]

Accuracy and resolution are two different matters.


73,
Dick - KA5KKT

Those who complain about the accuracy of any LED watt meter can be
completely ignored.  The resolution of an LED watt meter with ten LEDs
on a 2000 watt scale only has 100 watt resolution at any point on the
scale.  Hmm, that's five percent!

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Re: [Elecraft] W2 Wattmeter

[Don Wilhelm]

I look at those comments about wattmeter accuracy with a bit of 
skepticism.  Many hams seem to believe whatever their last used 
wattmeter tells them.  Look at the specifications carefully.  Take an 
example of the much revered Bird wattmeters, the spec is 5% OF THE 
FULL SCALE READING - and that is ONLY right after calibration.  That 
specification says that if a BIRD wattmeter has been recently calibrated 
and handled carefully afterwards, with a 100 watt slug, it can have an 
error of 5 watts - and that applies to *anywhere* on the scale.  A Bird 
wattmeter picked up at a hamfest can be much further off than that.

The error for the W2 (and several other digital wattmeters) will be a 
percentage of the actual reading (and not of the full scale reading).

There have been several upgrades to the W2 Firmware, and there will be 
more to come.  Check the firmware release notes and you will see that 
there have been improvements to the sensor calibration.  Those negative 
reports do not mention the firmware level that they were using nor did 
they make any statements about entering the sensor calibration data, so 
it may be that their W2s were actually reading low - but that *can* be 
corrected.

73,
Don W3FPR

KM4VX wrote:
 W2 WATTMETER I was doing some research and considering buying the Elecraft W2
 for use with my 2 K-2s and read the very negative reviews of the W2's
 accuracy on E-Ham. I wonder if anyone would care to refute the E-HAM reviews
 or offer positive comments about the W2's accuracy. At this point I would
 have to choose the AUTEK or OAK HILLS meters over the W2. Considering the
 cost of the W2 and Elecraft's attention to quality I would expect a far more
 accurate meter than the reviews would indicate. Many thanks.
   
   
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Re: [Elecraft] W2 Wattmeter

[Phil Hystad]

On Jan 2, 2010, at 8:43 AM, Edward Dickinson, III wrote:

 Accuracy and resolution are two different matters.
 
 


Yes, they are different but unfortunately they are often inextricably 
intertwined.


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Re: [Elecraft] W2 Wattmeter

[Don Wilhelm]

Dick,

That is true, but they are often confused - furthermore with any 
resolution on a display like a bargraph, it is helpful to know to know 
if the LED illuminates just after the indicated power is reached or at 
some midpoint value.  I don't know, but I suspect that Elecraft has 
chosen to trigger the LED illuminating at the low edge of reaching that 
power.  So on a 200 watt scale with 10 watt resolution, the 80 watt LED 
would be illuminated starting at 80 watts and the next LED would not 
light until the power reached 100 watts - If the comparison meter is 
only off by a watt or two, but is reading a bit high, then yes, the 
comparison meter could read 100 watts with the W2 LED showing only 80 
watts - for this example, bumping the power up a couple watts would have 
the W2 reading 100 watts and the comparison meter reading 102 watts  - 
so it may *look* like the accuracy is bad when in fact it can be really 
good agreement - it all depends on knowing how to read the meters properly.

73,
Don W3FPR

Edward Dickinson, III wrote:
 Accuracy and resolution are two different matters.


 73,
 Dick - KA5KKT
   

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Re: [Elecraft] W2 Wattmeter

[Don Wilhelm]

Sorry, 10 watts below should have been 20 watts for my example.  I hope 
everyone got the point despite my error.

73,
Don W3FPR

Don Wilhelm wrote:
 Dick,

 That is true, but they are often confused - furthermore with any 
 resolution on a display like a bargraph, it is helpful to know to know 
 if the LED illuminates just after the indicated power is reached or at 
 some midpoint value.  I don't know, but I suspect that Elecraft has 
 chosen to trigger the LED illuminating at the low edge of reaching that 
 power.  So on a 200 watt scale with 10 watt resolution, the 80 watt LED 
 would be illuminated starting at 80 watts and the next LED would not 
 light until the power reached 100 watts - If the comparison meter is 
 only off by a watt or two, but is reading a bit high, then yes, the 
 comparison meter could read 100 watts with the W2 LED showing only 80 
 watts - for this example, bumping the power up a couple watts would have 
 the W2 reading 100 watts and the comparison meter reading 102 watts  - 
 so it may *look* like the accuracy is bad when in fact it can be really 
 good agreement - it all depends on knowing how to read the meters properly.

 73,
 Don W3FPR

 Edward Dickinson, III wrote:
   
 Accuracy and resolution are two different matters.


 73,
 Dick - KA5KKT
   

 
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Re: [Elecraft] W2 Wattmeter

[Edward Dickinson, III]

Don,

Those are good points about the trigger and perception of accuracy of the
W2.

I have yet to see field test data of the W2 in regards to accuracy of the
Wattmeter and SWR indications.


73,

Dick - KA5KKT

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Re: [Elecraft] W2 Wattmeter

[Phil Debbie Salas]

Those are good points about the trigger and perception of accuracy of the
W2.  I have yet to see field test data of the W2 in regards to accuracy of 
the
Wattmeter and SWR indications.

According to the manual the W2 has an accuracy of +- 0.5dB typical (nothing 
about worst-case).  This is 10-12% accuracy.  Not as good as the 
PowerMaster/LP-100A/Telepost class of wattmeters that use NIST-traceable cal 
equipment (which should get you more like 3-5% accuracy).  Of course, those 
are $100-$150 more expensive than the W2.  If you use the W2 LED display, 
your perceived error could be greater than the 10-12%.  As an example, if 
you really have 100 watts and the W2 reads it 1/2-dB low, then possibility 
only the 80-watt LED would light.  So this would give you a 20% reading 
error.

Maybe the ARRL will do a review sometime soon.

Phil - AD5X 

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Re: [Elecraft] W2 Wattmeter

[Eric Swartz WA6HHQ - Elecraft]

Guys - The W2 is fully user adjustable for calibration. Please see the 
manual for details. Basically, if you wish to adjust its absolute level 
up or down to match a favorite 2nd Wattmeter, you can easily do this by 
sending +/- serial commands to it from W2 Utility.

My W2 is adjusted to almost exactlyu match my home Bird WM (which reads 
differently from another of my Birds...) ;-)

73, Eric

_..._



Bill Johnson wrote:
 I have the W2 wattmeter and original production software had some issues.  
 Those in most part appear to be corrected.  I do not have the lab equipment 
 to measure accuracy, but suggest that when any meter is placed between tuner 
 and antenna with jumpers there will be a difference no matter what meter one 
 uses.  I think the meter rollout was under pressure to get it to production 
 and not quite ready for release.  I wouldn't be that concerned now.  I use 
 the 1.5 kw module (something like that) and I monitor my 1.5KW amp to the 
 antenna.  With the amp in and out of circuit, the K3 and W2 seem to be close; 
 remember that jumper length, etc., will cause some difference!

  
 Bill
 K9YEQ
 K2-#35 (2 more), KX1-#35, K3, 

  

   
 Date: Sat, 2 Jan 2010 05:41:01 -0800
 From: ronce...@earthlink.net
 To: elecraft@mailman.qth.net
 Subject: [Elecraft] W2 Wattmeter


 W2 WATTMETER I was doing some research and considering buying the Elecraft W2
 for use with my 2 K-2s and read the very negative reviews of the W2's
 accuracy on E-Ham. I wonder if anyone would care to refute the E-HAM reviews
 or offer positive comments about the W2's accuracy. At this point I would
 have to choose the AUTEK or OAK HILLS meters over the W2. Considering the
 cost of the W2 and Elecraft's attention to quality I would expect a far more
 accurate meter than the reviews would indicate. Many thanks.
 -- 
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Re: [Elecraft] W2 Wattmeter

[NZ0T]

I'm very happy with my W2.  There was an issue with an intermittent in the
sensor cable but that was quickly resolved.  It seems accurate enough to me
on a subjective basis - I have no Bird to compare it to.  As far as
resolution goes the computer display resolution does rely on LED's and is a
continuous bar with a switchable peak indication.  This is only the 2nd
version of the diplay software and I'm sure it will continue to improve.  I
have a friend that has the LP-100A and it's a really nice meter but I'm not
sure I want to pay $120 more for it.

73 Bill NZ0T

Phil amp; Debbie Salas wrote:
 
 Those are good points about the trigger and perception of accuracy of the
 W2.  I have yet to see field test data of the W2 in regards to accuracy of 
 the
 Wattmeter and SWR indications.
 
 According to the manual the W2 has an accuracy of +- 0.5dB typical
 (nothing 
 about worst-case).  This is 10-12% accuracy.  Not as good as the 
 PowerMaster/LP-100A/Telepost class of wattmeters that use NIST-traceable
 cal 
 equipment (which should get you more like 3-5% accuracy).  Of course,
 those 
 are $100-$150 more expensive than the W2.  If you use the W2 LED display, 
 your perceived error could be greater than the 10-12%.  As an example, if 
 you really have 100 watts and the W2 reads it 1/2-dB low, then possibility 
 only the 80-watt LED would light.  So this would give you a 20% reading 
 error.
 
 Maybe the ARRL will do a review sometime soon.
 
 Phil - AD5X 
 
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Re: [Elecraft] W2 Wattmeter

[Edward Dickinson, III]

Thanks Eric.

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Re: [Elecraft] W2 Wattmeter

[David Fleming]

--- On Sat, 1/2/10, NZ0T n...@cox.net wrote:

 As far as resolution goes the computer display 
 resolution does rely on LED's

The resolution of the interface software's bar indicators is actually 10 times 
the resolution of the LED display. The FWD and REFL bar indicators have 200 
units of resolution compared to only 20 LED's on the W2. The SWR bar does 
follow the LED's. The textual power readouts resolve to .1 watt at the 2KW 
range, .01 watt at the 200W range and .001 watt at the 20W and 2W ranges.

The plus (+) and minus (-) buttons (lower right corner of window) can be used 
to calibrate the active sensor to an external source. The value is saved in 
EEPROM for that type of sensor (HF 200W, HF 2KW, VHF), regardless of which 
sensor is used.

New version soon with 'Always on top' and multiple instances support.

David, W4SMT


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Re: [Elecraft] W2 Wattmeter

[David Fleming]

 The FWD and REFL bar indicators have 200 units of resolution
 compared to only 20 LED's on the W2.

Make that 17 LED's on the W2.. 


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[Elecraft] W2 Wattmeter Software

[Radio Amateur N5GE]

Good evening.

I ran into this this morning after building the second W2 here.

I have 2 K3's here.  One that I use on HF and one that I use on 2m
70cm.  Although I can run two instances of W2.exe with each instance
connected to each of the two W2's that I have, I'd sure like to be
able to name each of the W2's and select one or both of them with
W2.exe.

Probably the simplest way to do that would be to name each W2 and when
loading W2.exe specify which one I want to load by selecting it from a
list.  Selecting another W2 might be done by simply choosing another
from the same dropdownlistbox and adding another stack of display
controls to the main form.

Another way might be to make W2 an MDI application and create a new
child form for each unique W2.

73,

Tom, N5GE

n...@n5ge.com
K3 #806 with SUB RX, K3 #1055, PR6,
XV144, XV432, KRC2,
W1, 2 W2's and other small kits

1 K144XV on order

http://www.n5ge.com
http://www.swotrc.net

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[Elecraft] W2 Wattmeter

[Roy Morris]

Why would I need a DCHF-200 coupler if the DCHF-2000 would provide low power 
readouts?  The display unit has the bargraph ranges of 2, 20, 200 and 2000 
watts.  Why not buy two DCHF-2000 couplers, one between the K3 and linear amp 
and another between the amp and antenna tuner.  This way one of the couplers 
could also be used with a second QRO station in the hamshack.   I just don't 
understand why a DCHF-200 coupler is needed unless it can provide accurate 
power readings under one watt that the DCHF-2000 maybe cannot.  Roy Morris  
W4WFB
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Re: [Elecraft] W2 Wattmeter

[Radio Amateur N5GE]

On Tue, 15 Dec 2009 15:22:05 -0500, Roy Morris
w4...@carolina.rr.com wrote:

The DCHF-2000 will not use the two watt range.

Why would I need a DCHF-200 coupler if the DCHF-2000 would provide low power 
readouts?  The display unit has the bargraph ranges of 2, 20, 200 and 2000 
watts.  Why not buy two DCHF-2000 couplers, one between the K3 and linear amp 
and another between the amp and antenna tuner.  This way one of the couplers 
could also be used with a second QRO station in the hamshack.   I just don't 
understand why a DCHF-200 coupler is needed unless it can provide accurate 
power readings under one watt that the DCHF-2000 maybe cannot.  Roy Morris  
W4WFB
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[Elecraft] W2 Wattmeter

[Ian Maude]

Hi all,
I might be having a blonde moment but I am looking at the W2 and it seems to
me that with 2 sensors, it can act as an antenna switch too.  Is this the
case or am I missing something?

73 Ian

-- 
Ian J Maude, G0VGS
SysOp GB7MBC  HB9DRV-9 DX Clusters
Member RSGB, GQRP 9838, FISTS 14077 | K3 #455
http://www.amateurradiotraining.org
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Re: [Elecraft] W2 Wattmeter

[Ian Maude]

You know, I realised as soon as I pressed send! :)

73 Ian

2009/11/4 Dick Dievendorff die...@comcast.net

 You're missing something.

 The sensors each have an RF input, an RF output, and a CAT-5 cable to the
 W2
 main unit. You put the sensors where it makes sense to put RF cables.

 If you get two sensors, you can connect them in-line with two different
 radios, one sensor per radio.

 You can use the front panel W2 switch to select which sensor to activate
 the
 LED display.

 73 de Dick, K6KR



 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ian Maude
 Sent: Wednesday, November 04, 2009 7:50 AM
 To: Elecraft List
 Subject: [Elecraft] W2 Wattmeter

 Hi all,
 I might be having a blonde moment but I am looking at the W2 and it seems
 to
 me that with 2 sensors, it can act as an antenna switch too.  Is this the
 case or am I missing something?

 73 Ian

 --
 Ian J Maude, G0VGS
 SysOp GB7MBC  HB9DRV-9 DX Clusters
 Member RSGB, GQRP 9838, FISTS 14077 | K3 #455
 http://www.amateurradiotraining.org
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[Elecraft] W2 Wattmeter

[Richard Squire]

The Shipping Status page (last updated August 7) states the W2 is
scheduled for shipping 8/30 to 9/7.
I ordered two kits but no katiegram so far... and no manual on the Web
site. Any news?
Richard - HB9ANM 
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[Elecraft] W2 wattmeter status

[fulltimeham]

Does anyone know if Elecraft started shipping the W2 wattmeter yet?  The
shipping status page on their website said Starts shipping 8/30 - 9/7
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