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Author Topic: Recommendatins for a watt meter.  (Read 4511 times)
KC2ZPK
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« on: March 09, 2012, 05:48:15 AM »

I need some recommendations for a simple, but good, accurate watt meter. Forward and reverse would be nice as well, but not 100% necessary. I need something that is capable of 2 scales 200W/2000W or similar. What I need is something that I can use to recalibrate the meters in a MFJ tuner that have gone wacky. I am still trying to find out what causes it, but right now the cross needle meter in my MFJ-962 is near useless. And I would like to have a meter that I can move around as needed. I wouldn't be opposed to building something, but it has to be fairly accurate when done.
Any suggestions?
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John
KC2ZPK.com - A work in progress
WE1X
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« Reply #1 on: March 09, 2012, 06:31:36 AM »

I currently use the Palstar PM2000A and it's great. Before then I had an older Daiwa NS-660PA that was excellent as well and never should have sold it.
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K9MRD
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« Reply #2 on: March 09, 2012, 08:48:57 AM »

Take a look at Array Solutions meter. It tracks a calibrated Bird very well and you can leave it in line all the time.

http://www.arraysolutions.com/Products/powermaster.htm
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KA3NXN
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« Reply #3 on: March 09, 2012, 09:41:37 AM »

Nothing beats the good ole standard, Bird 43!! I own 2 of them

Jaime-KA3NXN
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N6AJR
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« Reply #4 on: March 09, 2012, 09:50:37 AM »

I prefer the dual cross needle meter . I have several, from diawa, MFJ and workman.  they are not all the most accurate meters in the world. ( even at + or - 5 % at a thousand watts, you are talking 50 watts either way, so a true Reading at 1000 watts you are looking at 950 to 1050 watts range) but most of the time you need to know weather its going up or down and get a read on the swr, when tuning.  The dual cross needle shows forward and revers power and swr where they cross.  when tuning a $5000 amp you don't have time to push in and set, pull out and check. The dual cross needle shows all 3 as you tune.  The other option is an electronic meter which shows output and swr  digitally, but for the way less money, the dual cross needle meter is a winner in my book.
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KZ1X
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« Reply #5 on: March 09, 2012, 05:50:53 PM »

Get an Autek WM1.  Lightly used units are sometimes for sale.

http://www.autekresearch.com/wm1.htm



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K7KBN
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« Reply #6 on: March 09, 2012, 10:04:35 PM »

Bird 43 meters are certainly not paragons of "accuracy".  They are, however, quite rugged.  Like all measuring equipment, they still require periodic recalibration by a qualified lab in order to maintain +/- 5% of full scale as specified by the manufacturer.

If you have a 43P, the PEP maximum error is +/- 8% FS.

Not the most "accurate" meter, but no slouch either.
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73
Pat K7KBN
CWO4 USNR Ret.
KB1GTX
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« Reply #7 on: March 10, 2012, 10:58:25 AM »

But the Bird is just sooooo Ugly!!!,
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K8AC
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« Reply #8 on: March 10, 2012, 11:59:14 AM »

Please check out the LP-100A wattmeter by N8LP (http://www.telepostinc.com/lp100.html).  I've had mine for years and sold my Bird 43 and all the slugs shortly after getting the LP-100. 

73, K8AC
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AD5ZC
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Posts: 72




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« Reply #9 on: March 10, 2012, 02:47:34 PM »

Please check out the LP-100A wattmeter by N8LP http://www.telepostinc.com/lp100.html I've had mine for years and sold my Bird 43 and all the slugs shortly after getting the LP-100.  

73, K8AC

link fixed
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N4CR
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Posts: 1666




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« Reply #10 on: March 10, 2012, 06:36:05 PM »

Please check out the LP-100A wattmeter by N8LP (http://www.telepostinc.com/lp100.html).  I've had mine for years and sold my Bird 43 and all the slugs shortly after getting the LP-100. 

73, K8AC

Another vote for the LP-100A from Telepost Inc. It's more than a watt meter.
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73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
K3GC
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« Reply #11 on: March 10, 2012, 06:55:05 PM »

The LP-100A is fantastic.
Gene KW4GC
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N5XM
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« Reply #12 on: March 10, 2012, 09:51:28 PM »

I've gotta go with the Array Solutions Power Master.  Although pricey, it a beautifully made first class piece of equipment.
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W5DQ
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« Reply #13 on: March 10, 2012, 10:31:03 PM »

I need some recommendations for a simple, but good, accurate watt meter. Forward and reverse would be nice as well, but not 100% necessary. I need something that is capable of 2 scales 200W/2000W or similar. What I need is something that I can use to recalibrate the meters in a MFJ tuner that have gone wacky. I am still trying to find out what causes it, but right now the cross needle meter in my MFJ-962 is near useless. And I would like to have a meter that I can move around as needed. I wouldn't be opposed to building something, but it has to be fairly accurate when done.
Any suggestions?

I've got two MFJ-989C manual tuners and the cross needles have never been accurate at all and now one of them doesn't even work. No difference to me as I don't use the meters anyway. I use a Kenwood SW-2000 dual meter (individual meters not crossed in one meter movement) at the output of the amplifier and read SWR via nomograph with amp offline. Once tuner is set and rig is happy I switch on the amp at recorded presets and everyone is happy. The SW-2000 tracks very well with my Bird 43 and also provides peak measurements with 12V into the meter. They're priced reasonable too as used.

Gene W5DQ
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Gene W5DQ
Ridgecrest, CA - DM15dp
www.radioroom.org
K0JEG
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« Reply #14 on: March 17, 2012, 10:01:15 AM »

If you're looking for HF, I built an Elecraft W1 wattmeter recently. Took a few hours to assemble. It is calibrated using a VOM and a trimpot, using test points on the unit itself. It seems to be accurate, although I've only compared it to the meter on my FT897d. Only downside is that it uses BNC connectors in a strange location, and case options are few and far between.

http://www.elecraft.com/mini_module_kits/mini_modules.htm
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