Should this be a standard feature in modern HF transcievers given the issues many hams now have with RFI which only seem to be getting worse as more and more noise generating gadgets are installed all over the place.
I just borrowed one of these to test. My main antenna is a 40 m long EF, about 10 m up. I first tried my 144/440 antenna as aux, because I had read that it was a reasonable choice. It was not good, because the box didn't register any noise at all. I then ran a 10 m wire out the window. This picked up more noise on aux. I was able to clearly reduce the overall noise (using SDR Console to view), but readability did not increase. I was listening to an AM transmission on 80 m. After some experimenting, I clearly had the noise down by a few S, but also the clarity of the AM transmission. I will try a better antenna, and update my comments.
QRN. It's QRN. QRM is man made interference, not electrical noise. A station operating one kHz away from you is QRM. Atmospherice noise, lightning static, wind/rain/snow static, electrical impulse noise from appliances, ionospheric noise is all QRN.
Electrical impulse noise from appliances is man made noise - QRM - (M for man made, N for natural) and these units are designed to eliminate that and not QRN such as lightning static crashes.
The M and N would suggest that this is the case, but it’s actually a common misnomer. When the Q codes were derived (a long time ago) they had no designation for noise made by 50 or 60hz dirty switching ac devices. The M is actually more along the lines of if an operator is transmitting 1khz above or below and Donald Duck-ing into your conversation. That would have been how “man made interference” was conceptualized back then.. The more appropriate designation for any sort of electrical noise interference is actually always QRN.
@@garys.7846 There is no little man inside your appliance making it interfere. The electrical noise it makes is QRN. QRM - Man-made interference is other radio signals, intentional, or unintentional, Amateur or commercial.
@@AlGritzmacher A man or woman made the noisy, interfering appliance. Ergo, the noisy *RF* emanating from that appliance is manmade. Not naturally occurring atmospherics.
QRM = (M)anmade interference of any type, QRN = (N)atural sources of noise, such as lightning crashes, atmospheric static, etc. This device may help with QRM from noisy electronics, power poles and the like, but it won't null out the loudmouths talking over your net on 40 meters.
Interesting presentation, Paul. Clearly this device eliminated the QRN source, and probably could assist in reducing a local pesky QRN issue. So for the money, it could be worth a try. The problem is when there are multiple sources, like there are in urban areas. In those situations, we are pretty much stuck. Thank you for posting this and 73! de WX0V
Thanks Scott for watching! Yes, I guess you should then choose the strongest QRN source for your auxillary antenna and if it could pickup the others too that should be even better. :) I don't have QRN in my area so I can't make test in real condx :) Best 73
The Gain 2 control is labelled the wrong way around on this particular model. 0 is max gain, 10 is zero gain. You can test this by swapping your main antenna to the aux socket and having nothing plugged into the main socket. Ideally you want gain 2 as low strength as possible , so as near to setting 10 as you can, to reduce QRM so it doesn't reduce wanted signals.
All you demonstrated was that it does what you describe in that situation. Placement near the noise source is the key and is the problem in the real world. The signal you use is not nor is it similar to a voice transmitted thru a radio. Put together a real life scenario and record and post video.
Sure, this setup is far from real life. Usually you have no access to the noise source. Otherwise you could simply switch off the noise source… But it works under real life conditions, I tried it. The auxillary antenna can/should be a quite short wire. Ideally it is in no way resonant on the band you want to operate, to avoid picking up the wanted signal instead of the noise. The short (aux antenna) wire then picks up the noise and feeds it into the device to cancel out the noise by reverse phase mixing it into the signal received by the main antenna. That‘s how it works in simple words.
@@pasixty6510 Common guy... this is just a presentation...don't blame it. I appreciate this video simply because i have noisy QTH and such device could be useful for me so I consider buying it soon.. but i am curious if this work for me. Thanks for video DE OM1ACC
The reason the current consumption was lower I am guessing is that in transmit (by-pass mode), I am guessing you are having to energise a relay coil or two.
I bought the WIMO version of this. Useless. It did nothing to get rid of the QRM. It did get rid of wanted signals, which is awful. Main antenna is Steppir DB11. Aux antenna is a small telescopic whip with PL259 connector.
I was wish to see it connected by ptt on a transmitter would be nice to show us how the ptt connected to example a 11 meter cb radio like jackson 1 or superstar
I got one similar unit from MFJ, it worked great to eliminate noise from nearby commercial lightings while I work 6m, and it got auto Tx sensing to bypass the unit without additional wiring, but on this particular channel I need to add a 1.25x accelerator as well...
Hello I got a Yaesu FTDX 101 MP QRM Eliminator is turned off can you transmit 200 watts ON it another problem I would have with The qrm Eliminator all my HF antennas come in the House to a big 2K a Ten Tec 229B manual Antenna tuner on the back of my Big Ten Tec 229B antenna tuner I got a coax jumper running to antenna switch box for two different Radios Yaesu FTDX 101 MP ICOM IC 7610 thank you 73
Congratulations on the video. Your device has 2 gain and one phase knobs. Others have 2 phase knobs and a gain knob. Can you tell what the difference is? Thanks
Hello, I have this device, unfortunately without instructions. Am CB radio operator. Can you please tell me what I have to connect where and how I set up the device. Best of all, step by step. I thank you in advance. With kind regards 
Have you tried adding some extra coax leading up to your noise antenna so the phase setting isn't pushed to the limit? Maybe it could have been matched even better...
Hi Paul, nice device. Did you try this with 100W Power of your ICOM transceiver already? Because this is the big problem with my 7300. Tnx for any hint... 73 by Martin DG4BAD
@@OM0ET Hmmm... mine is clicking around with the tx relais at more than 50W on 80, 40, and 20m... 😭. It's then impossible to tune the antenna... Perhaps I try to change the HF-wires inside the device to RG174...
Presumably the ladder line is NOT connected directly to your transceiver, right? Place it between the coaxial antenna input of your radio and whatever device (balun, tuner, etc.) you're using to match to the balanced ladder line.
I purchased one of these hooked it to my rig expert and on 40 meters when I turn the unit on the SWR jumps from 1.04 to 3.5 so it is unusable for me. Have you checked your SWR with the unit on? Both antennas are 1.04 or better stand alone.
Thank you for telling me about this product in our QSO on Thursday 14th September 2023, as promised I found the video & watched all of it. All looks good 73 de M3TZX
Should this be a standard feature in modern HF transcievers given the issues many hams now have with RFI which only seem to be getting worse as more and more noise generating gadgets are installed all over the place.
Yes, that was my thought too. Why is not the phase cancellation the feature of any modern transceivers... that would be great!
@@OM0ET and it should be automatic!
It would have been nice to hear the system with the noisy lamp on and off.
Congratulations for the video!
Can you advise PTT cable details ?
Thanks
I also own the same QRM eliminator. This is the best demonstration of its use and effect on UA-cam! Thank you.
Does this go before or after the antenna tuner? I have read both...
I just borrowed one of these to test. My main antenna is a 40 m long EF, about 10 m up. I first tried my 144/440 antenna as aux, because I had read that it was a reasonable choice. It was not good, because the box didn't register any noise at all. I then ran a 10 m wire out the window. This picked up more noise on aux. I was able to clearly reduce the overall noise (using SDR Console to view), but readability did not increase. I was listening to an AM transmission on 80 m. After some experimenting, I clearly had the noise down by a few S, but also the clarity of the AM transmission. I will try a better antenna, and update my comments.
How did it go?
QRN. It's QRN. QRM is man made interference, not electrical noise. A station operating one kHz away from you is QRM. Atmospherice noise, lightning static, wind/rain/snow static, electrical impulse noise from appliances, ionospheric noise is all QRN.
Electrical impulse noise from appliances is man made noise - QRM - (M for man made, N for natural) and these units are designed to eliminate that and not QRN such as lightning static crashes.
The M and N would suggest that this is the case, but it’s actually a common misnomer. When the Q codes were derived (a long time ago) they had no designation for noise made by 50 or 60hz dirty switching ac devices. The M is actually more along the lines of if an operator is transmitting 1khz above or below and Donald Duck-ing into your conversation. That would have been how “man made interference” was conceptualized back then..
The more appropriate designation for any sort of electrical noise interference is actually always QRN.
@@garys.7846 There is no little man inside your appliance making it interfere. The electrical noise it makes is QRN.
QRM - Man-made interference is other radio signals, intentional, or unintentional, Amateur or commercial.
There's always a "super wise guy" telling this kind of comment. Ego ego ego.
@@AlGritzmacher A man or woman made the noisy, interfering appliance. Ergo, the noisy *RF* emanating from that appliance is manmade. Not naturally occurring atmospherics.
Is it QRN or QRM? QRM is interference from adjuecent frequency and QRN is noise according to radio lessons I have learned. 73
QRM = (M)anmade interference of any type, QRN = (N)atural sources of noise, such as lightning crashes, atmospheric static, etc. This device may help with QRM from noisy electronics, power poles and the like, but it won't null out the loudmouths talking over your net on 40 meters.
Interesting presentation, Paul. Clearly this device eliminated the QRN source, and probably could assist in reducing a local pesky QRN issue. So for the money, it could be worth a try. The problem is when there are multiple sources, like there are in urban areas. In those situations, we are pretty much stuck. Thank you for posting this and 73! de WX0V
Thanks Scott for watching! Yes, I guess you should then choose the strongest QRN source for your auxillary antenna and if it could pickup the others too that should be even better. :) I don't have QRN in my area so I can't make test in real condx :) Best 73
top Video thanks
The Gain 2 control is labelled the wrong way around on this particular model. 0 is max gain, 10 is zero gain. You can test this by swapping your main antenna to the aux socket and having nothing plugged into the main socket.
Ideally you want gain 2 as low strength as possible , so as near to setting 10 as you can, to reduce QRM so it doesn't reduce wanted signals.
All you demonstrated was that it does what you describe in that situation. Placement near the noise source is the key and is the problem in the real world. The signal you use is not nor is it similar to a voice transmitted thru a radio. Put together a real life scenario and record and post video.
I am sorry but if I had such noisy QTH so believe me I would rather made a real life video than simulated.
Sure, this setup is far from real life. Usually you have no access to the noise source. Otherwise you could simply switch off the noise source… But it works under real life conditions, I tried it. The auxillary antenna can/should be a quite short wire. Ideally it is in no way resonant on the band you want to operate, to avoid picking up the wanted signal instead of the noise. The short (aux antenna) wire then picks up the noise and feeds it into the device to cancel out the noise by reverse phase mixing it into the signal received by the main antenna. That‘s how it works in simple words.
@@pasixty6510 Yes, I am not sure if you watched whole video, but same thing I have explained there :)
@@pasixty6510 Common guy... this is just a presentation...don't blame it. I appreciate this video simply because i have noisy QTH and such device could be useful for me so I consider buying it soon.. but i am curious if this work for me. Thanks for video DE OM1ACC
The reason the current consumption was lower I am guessing is that in transmit (by-pass mode), I am guessing you are having to energise a relay coil or two.
I bought the WIMO version of this. Useless. It did nothing to get rid of the QRM. It did get rid of wanted signals, which is awful. Main antenna is Steppir DB11. Aux antenna is a small telescopic whip with PL259 connector.
Thanks for this presentation. I have ordered one and hope it will help me to drop down and eliminate the noises here for better SW reception.
I was wish to see it connected by ptt on a transmitter would be nice to show us how the ptt connected to example a 11 meter cb radio like jackson 1 or superstar
Very well explained to the World. Thx for sharing this with us. 73's de Your Friend Uncle Günter
I got one similar unit from MFJ, it worked great to eliminate noise from nearby commercial lightings while I work 6m, and it got auto Tx sensing to bypass the unit without additional wiring, but on this particular channel I need to add a 1.25x accelerator as well...
Przetestowałem to i działa ale musiałem wymienić płytkę ztylu na sztywną alu.
Hello
I got a Yaesu FTDX 101 MP
QRM Eliminator is turned off can you transmit 200 watts ON it
another problem I would have with The qrm Eliminator
all my HF antennas come in the House to a big 2K a Ten Tec 229B manual Antenna tuner
on the back of my Big Ten Tec 229B antenna tuner I got a coax jumper running to antenna switch box
for two different Radios Yaesu FTDX 101 MP ICOM IC 7610
thank you
73
Where would you place the SWR meter in this case ? Between the TX and QRM Eliminator OR between QRM Eliminator and Main Antenna ?
So you can not transmit through this with cb, only hf radio can transmit through this?
Also CB
i would like to see a video where this one compares to the QRM-Eliminator model "X-Phase" made by RA0SMS. which one will performs better ? i wonder
Seems all this did was magnify the qrm noise.
Obrigado
"If you have the pedal." What pedal?
Congratulations on the video. Your device has 2 gain and one phase knobs. Others have 2 phase knobs and a gain knob. Can you tell what the difference is? Thanks
Excellent video. Thanks for sharing. I could use something like this on my set up here, especially on the AM band.
How to bypass it for QSK transmitting?
You have to switch it off
Can you talk an transmit while receiving.?? Never see anyone talking while it's on??
Muito obrigado
Hernandez Eric Harris Amy Garcia Patricia
Hello, I have this device, unfortunately without instructions. Am CB radio operator. Can you please tell me what I have to connect where and how I set up the device. Best of all, step by step. I thank you in advance. With kind regards

Ever get it going on 11m???
Good presentation but what if you do not know what the source of the noise is?
HEY GOOD DEMONSTARATION,,, DID YOU MAKE ANY QSO WITH IT ?
Have you tried adding some extra coax leading up to your noise antenna so the phase setting isn't pushed to the limit? Maybe it could have been matched even better...
thanks my friend another good video 73 from kb2uew
how to connect to ptt to ic-706mk2??
Lol...c est de la merde
Lol...quelle horreur !
Hi Paul, nice device. Did you try this with 100W Power of your ICOM transceiver already? Because this is the big problem with my 7300. Tnx for any hint...
73 by Martin DG4BAD
Yes, I did Martin 🙂👍I didn't noticed any problem yet.
@@OM0ET Hmmm... mine is clicking around with the tx relais at more than 50W on 80, 40, and 20m... 😭. It's then impossible to tune the antenna... Perhaps I try to change the HF-wires inside the device to RG174...
How do you hook this up if you're using ladder line?
Presumably the ladder line is NOT connected directly to your transceiver, right? Place it between the coaxial antenna input of your radio and whatever device (balun, tuner, etc.) you're using to match to the balanced ladder line.
I purchased one of these hooked it to my rig expert and on 40 meters when I turn the unit on the SWR jumps from 1.04 to 3.5 so it is unusable for me. Have you checked your SWR with the unit on? Both antennas are 1.04 or better stand alone.
Mine is working fine 🙂
Same problem.
Is it the random China Quality? maybe you have figured it out?
Works well! Thanks for the video!
I use the MFJ 1026, it does the same thing and works very well!
Its the same. Only +200$ for the MFJ name on it.
so you don't need to use the PTT then? will the radio not be damaged if you use without it?
You need to use the PTT switch if you plan to Transmit otherwise you will cause damadge to the eliminator.
@@MrNathanChester why would you just listen?? Of course you want to tx..then this is usless.
@@charlessalard4636 the device is to reduce noise on receive if you are just a short wave listener you wouldn't need the PTT
Nice
Nice review. Thanks.
what is the transformer at the bottom of the primary rx antenna?
It is my mini 49:1 UnUn transformer which I use with my small SDR Malchite clone receiver. 😉
@@OM0ET thank you for the reply. What use does the balun have on a Rx only setup?
thank you
Thanks for the video i really need something like that
Cool 👍
Thank you for the video, i ve just bought mine, have a nice day from FRANCE
Thank you 4 watching Nadia! 😉👍
Thank you for telling me about this product in our QSO on Thursday 14th September 2023, as promised I found the video & watched all of it. All looks good 73 de M3TZX
Thank you Dave, I hope it could help you with your QRM 😉👍