- Amateur Radio (Ham Radio) Community

Call Search

New to Ham Radio?
My Profile

Friends Remembered
Survey Question

DX Cluster Spots

Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement

Reviews Categories | Voice Keyers | MFJ-434/434B Help

Reviews Summary for MFJ-434/434B
MFJ-434/434B Reviews: 39 Average rating: 4.1/5 MSRP: $179.95
Description: Contest voice Keyer (new improved)
Product is in production.
More info:
Email Subscription
You are not subscribed to this review.

My Subscriptions
Subscriptions Help

You can write your own review of the MFJ-434/434B.

Page 1 of 4 —>

GW4HBK Rating: 3/5 Apr 7, 2017 06:43 Send this review to a friend
Poor qc?  Time owned: 0 to 3 months
Just bought 434b,works as it should good but case is badly scratched both sides and top, how does this happen? I contacted the supplier they say it is brand new, I have no reason to doubt that. I have had the 492 cw keyer for many years,perfect. So QC?
AA2LF Rating: 1/5 Feb 27, 2016 19:11 Send this review to a friend
usual poor workmanship  Time owned: 0 to 3 months
In preparation for ARRL-SSB I purchased the 434B from HRO. First of all they raised the price to $190. But this is not the problem. The keyer came on time in original MFJ carton but not sealed. I opened the box and I start checking the unit. Not a surprise to find the Audio-In jack and the Level Adjustment pot misaligned to the case holes. This is typical to MFJ products, I had the same problem with a CW keyer. I checked the jumpers and I had to make three corrections to be able to use it with Yaesu FT857. Then, power on and trying to do the self test I realized the push button switches for memories 3 and 4 were stuck inside! Opening the encasement and forcing the switches few times I was able to release them.
But the self test failed anyway...
Then I tried to record the message #1 with the inside mike. Distorted sound. Using the Yaesu mike the sound is acceptable and I was able to set a decent volume using both adjustments. Useable memories are 1, 2 and 5. OK for now although I will eventually need to have them repaired. Repetition does not work at all, one needs to keep pushing buttons.
Trying the unit on the air I've got a good report from France and a not so good one from VE2 but this is not relevant until I hear a record of my voice.
Bottom line: the product is intended to be top of the line but is not even a mediocre one. All this because of poor workmanship and lack of QA/QC associated with very cheap mechanical switches.
The price is a rip off because not too may similar keyers are on the market. (I am still mourning the K1EA DV card from early 90s}.
I would not recommend this product unless the buyer is willing to do a lot of re-work and is willing to pay a very high price. I can send pictures and wav files to anybody interested.
KD2BMX Rating: 5/5 Mar 16, 2015 04:57 Send this review to a friend
Good Results So Far  Time owned: 6 to 12 months
I was reluctant to purchase this unit because of the negative reviews, but decided to give it a try anyway. I use the MFJ-434B with my ICOM 9100 and have been very pleased with the performance so far. All features work as described in the manual. The recorded messages are very clear and according to radio checks more punchy than the regular audio from the radio. I did have to adjust the jumpers for radio brand and audio level pot inside the unit as described in the manual, but that was a simple procedure. Having 5 pre-recorded messages to use does come in handy during DX-ing or contesting.
W0XX Rating: 3/5 Dec 31, 2014 16:40 Send this review to a friend
Okay - Needs some help  Time owned: 6 to 12 months
Got my 434B from DX Engineering. Found a screw in the top missing, the side screws don't line up from the chassis cover to the chassis. Typical for MFJ.

The Jumpers were supposedly set for Yaesu but mine were configured for whatever...they were all over the place.

One note I found out was I have to connect to my DC Power Supply in order for the PTT to function. Jumpers are a pain and they only show a hand full. Jumper settings should be more documented in the on line manual. Beware, some of the configurations out there may or may not match the unit you have. Configuration control is not a strong point with MFJ. Took a lot to get the unit to work.
EI4KI Rating: 5/5 Aug 19, 2014 05:41 Send this review to a friend
works fine for me  Time owned: 0 to 3 months
The design seems to be improved from one I bought around 10 years ago that was sold off when I moved. Set up and working within 10 minutes out of the box. Does exactly what it's supposed to do. No issues with FT920/950/847. Saves me messing with radios internal DVRs. Didn't add any additional noise to the audio chain. Would buy another.
AB2IR Rating: 4/5 May 30, 2014 04:03 Send this review to a friend
Happy  Time owned: 0 to 3 months
Just purchased May 2014. Was not to bad to figure out inside jumpers because of prior experience with other MFJ acc. Only needed eight jumpers, and extra pins just put aside of pins. Four rating because, remote paper top is wrinkled, and front metal edge paint job/ poor. So far all MFJ front edge paint jobs are poor. Recording time is "limited". Any time beyond the time design drastically cuts full record times. Ran over second level (10 sec.) and lost half the recordable time. Time limits are 32/10/10/10/12 seconds. Using a Tentec omni 7 and have output adj. to min. on back of unit. Internal mike is best record level. Would buy again.
W2YX Rating: 5/5 Jun 3, 2012 13:16 Send this review to a friend
5/5  Time owned: 0 to 3 months
Echoing earlier positive remarks on this product, I must say it was a snap to set-up for my rig and get on the air. All the supplied cables are first rate. Inside, the unit is a well-built quality piece of work. Just be careful to use either their (MFJ) AC to DC supply or a clean, filtered DC supply of your own. My bad that I had hum and distortion on the output, but that turned out to be my DC supply issue. No fault of the unit. Once that was replaced, it sounded great.
K5TGS Rating: 5/5 Sep 27, 2011 18:30 Send this review to a friend
If You Need this function you need this item!  Time owned: 0 to 3 months
I must say I am very impressed with this keyer. First, the manual is written very clearly with a logical flow of instructions. Second, the jumper configuration was very simple to follow with the provided tables. I use an Icom so I had to change the jumper configuration. After removing 4 screws, I imagine it took 3 minutes to make the changes and double check my changes. The table and picture provided in the booklet were perfect. The third item that I found very nice was the inclusion of extra jumpers, a modular to 8 pin round cable, a Cat cable and a power supple cable with the plug.

The unit performs exactly as described, from the very beginning. If you have the need for a voice keyer, or DVR, this is the unit to get.
NY1E Rating: 5/5 Mar 20, 2011 14:19 Send this review to a friend
Worked out of the box!  Time owned: 0 to 3 months
I bought a new 434B, I didn't check the jumpers, I knew I needed to change them for my radio. The manual is a little confusing and was disappointed with using an RJ45 for the output connector. I found an ethernet jumper cable in the junk box and cut off an end to attach the mic connector for the rig. The low impedance input didn't seem to mind the twisted pair instead of a shielded mic cable. Its a handy package compared to the lash-ups I've used in the past to repeat CQ's!
K1SEZ Rating: 5/5 Mar 17, 2010 16:49 Send this review to a friend
No problems on start-up  Time owned: 0 to 3 months
I ordered it on line 6 days ago and it arrived today (MS to CT). From opening the box to on-the-air was about one hour, with no problems. This will be my lever for better SSB contest scores!

All the wiring looked first class, and the instructions were good.

I'll review it again at the end of the year, but this is the sixth MFJ product over 5 years with no problems.

Page 1 of 4 —>

If you have any questions, problems, or suggestions about Reviews, please email your Reviews Manager.