QRM ELIMINATOR - Solve Your QRM Problems EASY!

QRM Eliminators, do they work?

Purchase here:

CN Coupon: BGe14e44
CZ Coupon: BG2470aa

Coupons Expire August 31st

If you would like to show your support for this channel, then please consider becoming a member by clicking here:

Products used in my videos can be purchased through my Amazon storefront.

If you enjoyed this video please help me out by subscribing and help me get to my next Milestone of 100,000 Subscribers!

#TechMinds #SDR #HamRadio

[raybans]

What you've demonstrated here is SO very important for today's ham radio operators. Domestic radio interference from neighborhood electronics is a major destroyer of the radio hobby.

A few years ago I lived in a city rental and the broadband QRM from the neighbor's electronics was terrible; well over S9 noise!. By properly adjusting my ANC4, QRM 'eliminator' I was able to be on the air and to maintain my regular skeds. Without it, I would have been off the air.

Thank You!

[srviejo]

If you're running one of these units or similar (I use the TimeWave ANC4+) with an amp, the noise canceller is installed between the amp and the radio, not at the output of the amp. Unless the un-amplified transmit exceeds 100W, there is no issue with this configuration. Most radios driving an amp are far far below 100W, making this configuration safe. Remember, the noise canceller is bypassed in transmit and the amp is passed in receive. That means that with the noise canceller between the transceiver and the amp, it is effectively connected directly to the antenna when in receive mode when the noise canceller is installed between the transmitter and the amp.

Installing the sense antenna where there is a large phase differential between the sense antenna and the transceiver antenna helps get the most out of these devices.

[nvca]

Thank you - great demo.
Make sure the noise/auxiliary antenna is not a zig-zack or in an angle, because then you may get noise signals from the same source with a different phase from each leg that will overlay each other. The outcome is that your phase null is not as deep as that of an antenna with a very defined phase angle towards the main noise source.
I built this one too (also available as a kit), but haven't tried it yet, also have an ANC-4 by JPS, which does a good job.

But the best thing against local noise is a magnetic loop that is highly symmetric and if you can put this on a rotor or have two 90° towards each other and a phase shifter you will have the best noise immunity ever, because most common noise sources are in the near field on the electrical domain and only create the magnetic component in the far field. Therefore a magnetic antenna will always drastically outperform an electric antenna in a noisy environment, which today is almost every environment unless it is far away from houses.
I live in a multi family house and until a few years ago I gave up on my radio passion, receiving HF because of the intense noise. Just before giving it up, I bought a magnetic antenna kit from LZ1AQ and built two 1.5m diameter loops from thick copper wires and can now switch between them A or B or A+B and the results are outstanding ... a signal to noise of sometimes over 90dB! requires more than 12 bit resolution SDR, but the signals clarity and quietness seems even better than how I remember HF reception in the 80's and 90's with plenty of sun spots and huge outdoor antennas.
Today with these two loops in the attic I receive signals around the world almost 24/7 on FT8 ... I am in Munich, Germany and now as I write (22UTC) I see DX signals on 17m band from Alaska via the West Coast, Brazil, Argentina, Thailand, China and Japan ... though currently no signals from VK, ZL, Hawaii 😞 ... PY, VU and ZS comes in on 40m ... anyway it is pretty amazing for an indoor antenna.
I do not have any affiliation with the manufacturer I mentioned, I guess a Wellbrook or something similar may also get the same great results, though it is far more expensive ... just make sure the h-field antenna is pretty immune to the local e-field, then you will be fine.
Good luck and enjoy the shortwave bands, which seem almost magical again with the recent sun spots!

[GSTU]

Mine is between the radio and my Acom amp, works great. The box can also be used to add an RX antenna to a radio that doesn’t support it, you just phase in antenna two rather than out. That’s what I use it for the most these days. These things do take a lot of playing with to understand, but they do work, just don’t expect to go from s9 of qrm to nothing :) 73

[Tommyr]

I have the MFJ 1026 and it works great, even with it's telescopic whip antenna. I get wicked AM radio station overload from a radio station about 1/4 mile away and this thing takes it right out! I have a video on my meager channel showing it at work.

[EOGIY]

I heard the good advice - sampling antenna should be in other polarisation that gives -40dB difference in the far field, but near field should be about the same, that makes phasing out QRM more accurate.

[madmax]

I use mine on my shortwave receiver and SDR, and they do work quite well, BUT they only work on a single noise source, if you have multiple noise sources it's not going to do much when you have multiple noise sources with an omnidirectional antenna as the main. Now if you pair the QRM Eliminator up with a loop antenna as the main antenna you can handle multiple noise sources, as you can use the loop to null out one source, and use the QRM to null out the other, of you have more than two you're just going to have to choose the greater more annoying noise source out of all to null out.

They can be really finicky to get working, you have to try multiple antennas for the noise/Aux antenna (it's not going to be the same for everyone and everyone's noise source is going to be different), and where you have to place the noise/Aux antenna is also going to be different, and how you place it (vertically or horizontally) is going to be different.

Most people's failure with these is that their noise/Aux antenna isn't correct (as in the type of antenna, the area you place said antenna, and how you place it (vertical, or horizontal), as each noise source is going to be different to everyone, there will be no 100% solution for everyone, like you said, if the noise antenna picks up the broadcast you're trying to listen to, the QRM Eliminator is going to partially null it out and you'll still hear the noise.

And then there the whole knob fiddling, which also takes time to get right.

[TRTelos]

Neighbours fish tank, s6 noise until I saw it dumped in back garden! . Now new neighbour after house renovation and LEDs installed, s9 at set intervels right through the bands about every 15khz. My Qrm eliminator no more as 100watts put through it even though I had the wire from Alinco DX 70 connectedto activate the qrm eliminator bypass switch, but later I read a resistor needs cutting inside the radio to activate it, ohhh well!

[paulwhite]

Thanks. Bought something similar a year or two ago, but haven't used it yet.
Main interest ATM is MW DX and the problem with most QRME designs is their low frequency limit.

[DavidWebb-ip]

A 4foot vertical picks up the noise better than a horizontal wire

[michaelwalsh]

They do work with patience.The other way is to use a remote receiver if you are listening to one specific frequency, such as hack green or others on your phone or computer.

[giossico]

I just ordered the item and used the discount! thanks can't wait to use it!

[SimonBlandford]

Since QRM is usually broadband and based on mains frequency (50 or 60Hz) then it should be possible to extract this on (web) SDR radios by looking for a repetative waveform across the whole SDR passband, averaging the 50/60Hz waveform over a few 100 cycles and then nulling it out. No need for another antenna then. Although another antenna is probably better if there is one to use.

[JReed]

I have one of these. I have it between my G90 and XPA125B it does help with some of the local noise but I imagine it will do much better if I spend some time making a better noise antenna.

[KDZHF]

Regarding the 100 watt limit - if you have a radio that does more, they often have a receive only antenna in - so you could use that. The other option is to place this before the amplifier and tuner, right? Not many radios need to excite an amplifier with more than 50 watts I think, correct?

[valdyjosedegodoyjunior]

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

[davidblackman-wells]

I’ve a lot of QRM S8-S9 4:00 On my HF inverted L I’ve earthed the antenna which has made a small difference not sure how well the Eliminator

[sendyfepp]

Do you think it could help reduce the Qrm of my unleaded patrol car engine on HF ?

[kaizerbrand]

How about more videos on the operation of Aillunce HS2 with Digital modes.
And yes how to turn on the trnsmit function of the HS2, as it comes factory seting is only set for receiving

[MMIMC]

Put it between the radio and amplifier.