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write your own review of the MFJ-812B.
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N5YSZ
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Rating: 0/5
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Aug 21, 2008 19:06
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junk
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Time owned: 0 to 3 months
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Yep it is a useless piece of junk. I ruined 2 good antenna and hours spent for nothing.get a Bird!
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KI6PDQ
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Rating: 0/5
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Jul 21, 2008 20:50
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Wake up n smell d coffee
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Time owned: more than 12 months
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Welcome to MFJ "Mighty fine Junk" my dummy load was a lemon out of the box, thanks MFJ.
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AB0XE
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Rating: 0/5
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Jul 21, 2008 16:36
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Did not Work
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Time owned: 0 to 3 months
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I wanted a inexpensive swr meter for my ARES radio box. My antenna was 1.5 to 1
I 1st checked it on a Yaesu YS-500, then Daiwa CN 103l
MY radio was set for 10 watts, hooked up MFJ, switched to forward power ,set full scale deflections as required , switched to Reflected power and it is still reads 10 watts
Checked and double checked then
like a dope I took it apart thinking there might be cold solder joint or something, of course now my warranty is void. MFJ must love dopes like me
Well I quess if nothing else I have a forward power watt meter
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KE3JH
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Rating: 0/5
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May 30, 2008 06:33
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real bad
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Time owned: 0 to 3 months
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i ordered mfj 812b and didnt work. the store said they will send a new one so i asked they check it first. Well they checkes 7 models before they found ONE THAT WORKED! im hoping it still works when it gets here. I thought they inspected there junk before they shipped them to the stores?
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KB0LPI
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Rating: 4/5
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May 1, 2007 13:25
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Works fine for me
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Time owned: 0 to 3 months
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SWR readings seemed in line for the antenna I was running. Power readings confirmed factory specs on 2 radios. the 30W setting was right on the money, but I don't know how they picked where to put the 300W mark. It was nowhere even close, but it worked fine when I calibrated for 300W scale according to the instructions.
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VE3QJ
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Rating: 5/5
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Apr 10, 2007 07:39
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Reliable
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Time owned: more than 12 months
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I bought this meter in 2005 and i keep it in hooked up. Nice size, Accurate, good price, (around $40.00 cdn), and i like the convenience of the 220 band coverage.
Great for field day too.
I highly recommend it.
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N8ERM
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Rating: 0/5
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Mar 18, 2007 13:00
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Junker
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Time owned: 3 to 6 months
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This is the worst piece of test gear I have ever used. The readings and not even close to accurate. If you use this you will need to order finals for your rig because a dead short in a piece of feed line was a 1.7 to 1. I scrapped the guts and used the enclosure for a project box. It is its only use.
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W6TH
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Rating: 5/5
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Dec 14, 2006 14:31
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Works great
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Time owned: 0 to 3 months
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I purchased this on eBAY the fourth buyer and it works as it should. No problems.
I insert a low amount of power to the forward power, not more than 5 watts and switch to reflected power.
Tuned two "J" poles using the 450 ohm line and covered the low and high end of two meters with accuracy. Diodes are non-linear so by applying high power will give a false reading, so do tuning with as low as possible power for the full forward setting.
I compared this with several other vswr meters like LaFayette, Radio Shack, Heathkit and they all were same readings.
Should you have troubles with such a simple test equipment, one should ask the advice of operation from a professional, but remember "do not overpower" the diodes.
73, W6TH A non vanity call.
.:
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KC9GUZ
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Rating: 3/5
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Feb 12, 2006 09:27
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not the most accurate thing for SWR
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Time owned: more than 12 months
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Hooked up against my old MFJ 249 analyser (that is suprisingly very accurate!!) the 812 showed a significant difference in SWR readings.
I wish MFJ would get on the ball and do soemthing with their new stuff instead of producing JUNK that most people will end up returning or thowing in the garbage pail..
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