I love small things that are so simple but have a very big effect. That was a very good thought, Paul! Thank you and 73 Bernd

Brilliant Idea ,matching the impedence.And the nice construction ..Thamks Paul..

Excellent project video from start to the finishing outdoor test. Clear videography closeups and descriptions. You’ve provided an excellent tutorial for building a simple transformer for other devices that may also have severely mismatched, inexpensive antennas. Thank you!

You should build and sell those impedance adapters, surely lots of SDR users like me, will buy it.

Thank you Paul for this very informative video, I am going to build this right away.

Wow, Paul this is very impressive improvement. Excellent work! Thank you very much for the information!

Just finished to build it! What a improvement! Thanks for sharing it. 73 de PT2JR.

Wow. Nice work. Great video again Paul - cheers!

Thanks Paul great video. We forget how important impedance matching is when just receiving. Your video production is great, easy to follow .... Thanks

Fantastic idea with construction tricks and beautiful performance demonstration. Congratulation, Paul. Thanks for your efforts. PP1RD- Fernando, from Brasil

Nice !!!!!! Great idea Paul !! I will be doing the same antenna enhancement on my home made portable DSP receiver.

Nice to see someone that can solder Nice project Thanks

Good tip and build Paul 👌 👍👏👏

Thank you so much. Now I know how improve the reception when mine arrives!

Brilliant! Thanks for this. Excellent video. I'm waiting for my Malakit to arrive but it could be useful for my RSPdx de M0SNR

Really interesting video, very demonstrative. Thank you!

Well done, very practical improvement.... 👍🏼

Great video, I am new to SDRs and your video was great to make a better mobile antenna. Thanks for posting it.

1 of my favourite 49.1 great video.

Thanks for the DIY Video I just got burnt on one of these radios I ordered a complete Malachite radio case antenna etc. and they sent me an incomplete board charging cable still trying to get my $105.00 back. This antenna project would have been great I built my first radio when I was in the boy scouts in 1966. KD6TXB

Well done PAUL and the 49/1 and the 64/1 are my favorite UNUN, they just seem to always work. 73. KV5P

Always perfect Paul 😜👍📡

Brilliant! Now I have to get one of those radios.

For anyone that doesn't want to build their own unun, there's one you can buy that works very well called "Magic Whip" available from Greece on Ebay.

Thanks for sharing your technical skills , concerning this unit!! Fantastic presentation on antenna mod!!

Thanks for the valuable information!

You did a great video showing simply how to make one yourself. Incredible how many hams today aren't willing to attempt for themselves such a simple project, as evident in this comment section. Thank you.

Genius, thank you.

A different ham posted a video showing too much noise in the Malachite, and he said adding a transformer wouldn't help the problem. I guess he was wrong. Brilliant video.

nice transformer it works ! well done !

This is brilliant and easy to build. :0)

Very interesting, big difference!👍

Very informative video, thank you for shearing.

Very good. Congratulation 👍👍

These are also a "must have" if you want to just clip a 20 ft wire to the whip antenna and string it across a room or toss it out a window. Or if you erect a simple longwire outdoor antenna you put one of these at the coax feedpoint. I already have a couple of these laying around but they are set up for BNC because that's what the Softrock and others homebrew units use. I also have some simple high pass, low pass and bandpass filters I'm going to convert to SMA. They can really help with these types of radios with their wide band front ends especially with wideband non-resonant antennas like a simple longwires

Excellent 👌 I was planning to buy this RADIO.

Very good demonstration. Good language skills. 73 and happy trails to you. Thank you. JR

Great video!

Outstanding Paul.....I wish a pre-made version (I'm not very handy with such gear) was available. 73s

PLEASE I NEDD ONE OF THOSE TRANSFORMERS.... !!!!!!!! There's a Huge difference in gain. Thanks for the video my friend, very helpful and interesting. 73s from KJ4BGW

Love the "grin ding" of the "win ding" ;)

Pure genius. Will build one for my malachite sdr radio

Great video thanks for the information! 73.

Very much enjoyed the drill method to twist the wires for the transformer. That alone was worth the price of admission here. One note; for "windings", the English version would pronounce it "wine-dings" (or the non-alcohol version: "whine-dings"), versus "wing-dings", otherwise, your English is great. Excellent work, Paul...as usual! 73! de WX0V

Very interesting, Paul !

That’s great!

great job..

finally someone with some common sense

great , tnx

Hi Paul, I always find yr videos very interesting, this was a very gd example of impedence matching, is their an attenuaror function on the reciever? You may need it, hi hi 😀😀

Hello from YO5OUY. Perdona si escribo en Español,se hablar mejor spanish como en Ingles! Muchas gracias,muy educativo y divertido en el mismo tiempo,me gusta tus explicaciones y tu gran paciencia, gracias para tus trabajos! Lástima para tus arañas de tus manos ! "Setenta y tres!" Thanks and 73!

very good project, what is the inductance of the inductor you have built?

Great demonstration! Have you tried with some other toroid type, for example type 2 (red) type 6 (yellow) or those cheap green ones? 43's are really hard to find.

Thank you very much! I am very interested how you calculate or measured to come to the result of the toroid size and windings.

Very interesting. On mine if I press Hard then the Attn button it goes from Hi Z to 50ohms. Cheers from George

Thank you Paul for this build video, I am building two versions so I can see if they are both wound correctly which I think is the most difficult to reproduce , can you please advise on which Malahite setting to use with your Transformer, Hi- z or 50 ohm please many thanks again.

自藕阻抗变换及双绕成电容式？ 可否用电视300Ω/75Ω 天线匹配器改绕成这非平衡式？ 你设计的小巧！👍！

Is there another option to just buy the correct antenna? If so which one? Thanks for the interesting video.

Nice job, TNX 4 the upload! 73 N8AUM

👍✌

Nice video Paul, and a great tip. Thanks alot 73 pa1jpr

Thank you for this project. I tried using this on a tinySA spectrum analyzer to see if it would improve the reception at 300 MHz. I actually got a reduction in the signal. Is there a reason why it wouldn't work on the tinySa?

There is a requirement when using a short whip on frequencies below 20Mhz to impedance match the low

Do you sell these either as a kit or preassembled?

Great video as always! On my Malahit FW 1.10a I have a High Z/50 ohm impedance option. I think ? that does the same thing. Was that option not available when you did this video? I also happen to have a Miracle Antenna with a small onboard tuner that gives me similar results. Hope this helps. ve3bwp

If I wanted to buy a professional made antenna that already did this, what would it be called? I love the DIY, but it might be best to buy a manufactured version.

Ďakujeme za video! 73! Hg2scs

What is the purpose of twisting the wire together for two turns?

Would it be possible to install the transformer inside the case of the receiver with some kind of selection switch so that it is possible to chose between the direct connection and the transformer or would a switch cause loses in the signal?

2m is useless as inteferance from the internal circuit, but its great on HF exept for powerfull stations swamping the band , half of the memory slots do not work. The freq steps are a REAL pain on the touch screen to touch correctly and selecting a station from the touch screen is bad as you end up with tiny frequency steps to correct as frequency step changes., once on a station it is pleasing.The sound is really full and detailed on FM and great on hf. I On mine the Pre amp setting is wrong ie off is ON, and on is OFF, leave it activated ie OFF on the rod antenna and dont activate it on a 20m wire or similiar. Setup I find 75db on AGC as recomended by the Russian designer "George". RF gain 20 to 25 on rod with activated preamp, 10-15 setting on 20m wire with preamp not activated (with 9:1 balun).The screen was not flush with the case a gap of about 3mil at one edge, I opened the front and found the edge of the circuit board snapped of at 2 corners,thats why it would not hold down. If you open the case it will be a pain as the other side of the visible case screws is a nut which will drop off inside! It is an incomplete radio, but it receives way better than my techsun 660 and sounds better and picks up more than my Icom pro due in part to having no mains borne inteferance which renders my HF radios useless at times thats what was apparent straight away on battery power. Some time it does not want to come out of hard setting and a restart is required. No speaker grill is not a good idea, its been thrown together, not Chinas best offering, shame.

Hi! Nice video, I build It for my portable SDR setup, It improved the reception. Would you mind a question? Some images of 49:1 balun show a optional 100pc ceramic capacitor between ground and antenna connection of the receiver part. Is this really needed? 73s de PU5TOS.

Thenk you TA3IMD TURKEY 73

Hi, great video. I see that you were doing the demonstration on 40 meters. How does it perform with Medium Wave and the other shortwave bands? Would we need a different transformer for each ham band?

Thank you for this vid. Is it worth buying this receiver? I’m a shortwave DX listener, I own a PL660 and I reckon it has a good performance, but I’d like to have a more compact receiver. 73’s.

I’m waiting for someone to produce a larger model with at least a 10 inch display. By that time they should have fixed the impedance mismatch problem.

73 Paul nice achievement but will 49:1 still be useful for high bands?

question is there available in the market telescopic antena with buikt in transformer. thank you and stay safe all.

Is there an antenna similar to this custom one that's already pre-build for the Malahit?

Can you add a link for the adapter to add the balun?

Hello would FPV RC rx aerials be useful for eg clover leaf and shotgun?

Original Malachite has filters on short waves, adjustable attenuator and "high Impedance" mode when you selecting Telescopic antenna by menu. Clone is clone. Not all functions are added.

Please put these for sale on your website! PLEASE!

The original Harris tape style HT antennas have a small unun under their rubber base as well. Not so sure about the knock-offs.

You did not show the settings of the receiver. Was it set to 50 ohms or hiZ?

I discovered a gap (Out of range) at the military band. 262.6250 MHz (Dutch AOCS NM QRA primary). Is it true this receiver has gaps and frequencies that cannot be set? I have a full band receiver exactly like yours but (-Rev Espe).

There used to be made an antenna called Miracle Whip that was adjustable and on Ebay is one now made in China, do you think it might work for that unit?

Or - you can switch the radio input between "50 Ohms" and "Hi-Z" in the HARD Menu. Clearly says "SW antenna".

Best Regards and 73s De a71br

👍

Did you buy the PCB as-is, or did you make it?

I think that the HIGH -Z function in the menu is there to take care of this problem.

Why did you use a twisted pair of wires for the low impedance winding?

Woud.you please draw a circuit of the transformer. Many thanks.

where did you source the pcb board

WHERE CAN YOU FIND THE ANTENA CONNECTORS AS SHOWN IN THE VIDEO.....the two connectors soldered to the PC Board ????

Hello Paul. I'm wondering why signal is better on antenna with your transformer... I mean as short antenna as 100-150cm has impedance of unity ohms on 40m band and lower on lower bands. You made transformer which usually is used to transform Hi-Z (2500ohm) end-fed half wave dipole to 50 ohms. In your example you transform 0.5ohm antenna (150cm short ground plane for 7MHz) in addition divided by 49! You got final impendance ->> 0.01 ohm

I can't figure out where the idea of twisting the wires will increase coupling. Coupling occurs because the flux in the toroid is common to both coils which provides the coupling.

Shame that won't fit inside the Mala case. Then we could have a high and low impedence antenna connections.

Question the socket for headphone which I have a Attachment to my computer will that work on my PSK 31 software secondly I orders a 25m long wire HF with BNC I have a attachment for the BNC will this work Look forward to hearing from you paul In Kent

Is this a 49:1 unbalanced wire length to balanced input (Balun) you have made? - I thought 49:1 transformers were only for end fed Half-wavelength antennas? & not random wire lengths or a telescopic etc? Isn't it a 9:1 transformer you need for a random wire length antenna or a telescopic