Category Archives: Audio Gear

Audio Gear

Pop Filter mounted on the Behringer B1 Studio Mike


After adjusting the levels on the Behringer Ultramizer Pro I have notice another problem. On the audio, when I was using the words containing letter “P” “F” some pops apear. The solution on this problem was to mount a Pop Filter. Unfortunately on the local audio store, this device costs around 20 Euros plus taxes so clearly it was too expensive. Searching the Internet I have found several tutorials on how to build  a DIY pop filter. Look at the images above how my creation looks. I want to  mention that all the materials doesn’t cost more then 3 Euro.

ro: Dupa ce am terminat de setat compresorul  multiband Behringer Ultramizer PRO o noua problema si-a facut aparitia. Rostind in preajma microfonului cuvinte ce contin literele “P” si “F” suflul de aer genera un zgomot destul de urat sesizabil sub forma unui pocnet (pop). Puteti verifica si voi acest fenomen pozitionand palma in fata gurii la aproximativ 3 cm si rostind cuvinte ce contin cele doua litere (sugerez: Para, Par, Pendula, Pensula… lol ah? ).   Probabil ca ati observat ca in studiourile profesionale, in fata microfonului exista filtru textil creat expre pentru a opri acest fenomen. Solutia “industriala” costa undeva la 20 euro plus TVA motiv pentru care am decis sa construiesc in regim DIY ( Do it Yourself) un asemenea filtru folosind un gherghef utilizat in broderii iar ca material textil am ales o pereche de ciorapi de dama. Suna amuzant stiu, dar va asigur ca am rezolvat problema pop-urilor cu nici mai mult nici mai putin de 3 Euro.

Cables behind my Behringer Audio Equipment


In the image above you can see some of my XLR-XLR audio Cordial CMK222 Cable with ferrite on them to avoid any RFI that could cause trouble on the Behringer Audio Equipment.

If you want to experiment with some professional audio gear on you’re ham radio shack don’t forget to use as short as possible good audio cables with a serious shielding, use the balanced XLR connector if it’s possible, use two ferrite on each end of the cable, keep the audio cables as far as possible from the antenna and power supply cables, a good grounding is always welcome in the shack … and many other advices that you can find on the net.

Behringer Feedback Destroyer PRO DSP1124p


Am reusit in sfarsit sa fac mult doritul upgrade de la egalizator grafic Behringer MiniFBQ800 la egalizator parametric DSP1124p.

Behringer DSP1124p  (Ultra High-Resolution 24-bit Dual Engine Automatic 24-Band Feedback Destroyer/Parametric Equalizer) contine un egalizator parametric digital stereo cu 12 benzi/ canal ce are si posibilitatea de a detecta si atenua eventualele microfonii (feedback destroyer).  Functia de feedback destroyer nu are aplicabilitate radioamatoriceasca dar egalizatorul parametric ofera utilizatorului un control extraordinar asupra curbei de raspuns in frecventa a modulatiei trimisa in eter prin intermediul transceiverului.

DSP1124p are capacitatea de a aloca pentru fiecare din cele 12 benzi, frecventa de lucru, castigul sau atenuarea, factorul de calitate (Q) al corectiei pe respectiva frecventa reglaj ce afecteaza in functie de valoarea aplicata alte frecvente din jurul celei de baza, reglajul fin al frecventei de lucru. Fiind un aparat digital, acesta ofera si posibilitatea de a stoca pana la 50 de preseturi fiind foarte usor de experimentat diverse curbe

Trebuie sa recunosc ca initial mi-am cam prins degetele in functiile acestuia  dar in cele din urma cu ajutorul renumitelor site-uri ale lui nu9n, w3oz si la3xia am reusit sa pun la punct utilajul.

Mai multe informatii despre DSP1124p pot fi gasite pe site-ul producatorului.

Continue reading Behringer Feedback Destroyer PRO DSP1124p

Behringer Ultramizer Pro DSP 1424P


O ultima achizitie in lantul audio al statiei mele, Behringer Ultramizer Pro DSP1424p Ultra High Resolution 24-bit Dual Engine Digital Multiband Loudness Maximizer/ Program Enhancer sau cel putin asa scrie pe cutie. Initial am vrut sa schimb egalizorul actual (MiniFBQ800) cu un DSP1124p egalizor parametric dar cum acesta nu era pe stoc am decis sa fac upgrade-ul pe partea de compresor si astfel am inlocuit MiniCom 800 cu acest DSP1424p.

Notiunile precum Ultramizer sau Loudness Maximizer, Program Enhancer folosite din motiv probabil comercial de catre Behringer mascheaza adevarata functie a acestui aparat care de fapt este un compresor digital multiband unde  Exceiter -ul este un compresor reglabil pe partea de inalte iar  Super Bass -ul este un compresor cum banuiesc ca v-ati prins pe partea de joase. DeNoiser -ul este de fapt un noise-gate, functia Ultramizer reprezinta setarea compresiei totale iar functia 3D Surround neutilizabila in aplicatie radioamatoriceasca probabil ca produce anumite defazaje intre canalele stanga/dreapta astfel incat sa creeze un efect de spatialitate.

Continue reading Behringer Ultramizer Pro DSP 1424P

Listen to some good eSSB stations on the bands


If you want to listen on those eSSB (Hi-Fi SSB, Voodoo Audio, Extended SSB) stations check the frequencies/bands below. Try to use a wide bandwidth filters on receive if possible.

10 Meters: 28.930
17 Meters: 18.120
20 Meters: 14.168 ; 14.178

40 Meters: 7.210 ; 7.235
(Warning, in YO the 40m band is between 7.000 and 7.200)

75/80 Meters: 3.630 ; 3.740 ; 3.810 ; 3 840 ;3.850 ;  3.910
(Warning, in YO the 80m band is between 3.500 and 3.800)

160 Meters: 1.930 ; 1.963

source of info and

YO3IBW Audio Test 21.07.2009

In the audio sequence above you can hear the difference between the Behringer audio setup and the default hand mike MC43.


In the image above you can see the graphic of Behringer Audio Setup. Microphone Behringer B1, Behringer Shark DSP110 (preamp, noise-gate, small compression), Behringer MiniFBQ 800 (9 band graphic EQ), Behringer MiniCOM 800 (Modeling Compressor)


In the image above you can see the graphic of Kenwood MC43.

The Kenwood TS850S AT was set 2.7Khz on 8.83 filter and also 2.7Khz on 455 filter with the transceiver speech processor ON. The recording was made from a President Lincoln transceiver and a condenser microphone connected to a laptop.

ATTENTION! This is not ESSB. I’m using the standard filters 2.7Khz wide but different “microphones”.

How to adjust you audio processors for best SSB results.


The first step is to adjust the high frequencies in you’re modulation. Drop down all mid and low frequencies below 2 Khz, disable the noise-gate, the compressor and all other enhancing devices except the equalizer. The high frequencies that we’re going to tune is between 2 khz and 4 khz. Listen with the moni function on your transceiver and a pair of headphones so that the high frequencies doesn’t sound harsh, adjust them until they sound pleasant. My EQ on this part, 2 Khz is +6db and 4 Khz is +12db

The mid range around 250 hz to 800 hz is the audio part that make the audio sound like a tin can. Be carefully how much you use them. On my EQ the 500hz is down to -12db and the 250hz is a little up, but no more just a bit. The 1 Khz is the key to you voice, in my configuration this tone is on 0db (zero db).

Let’s go on the low spectrum of you’re audio. The purpose of the low frequencies on your audio is to make a contour to you’re voice. Don’t exaggerate with this part else the sound is gonna be boomy and the intelligibility will decrease. Pay attention on the 100-200 hz range. Increase the 50-80 hz range. My EQ is 125 Hz a little under 0db (zero db) and 63 hz around +6db.

More info about how you can make your voice on the radio to sound good, check the LA3XIA web page.

My audio equipment RF problems in 40m band


There was a problem with the RF and my audio equipments in the 40m band and only in that band. When I was pushing 100W in my Inverted V 40m band antenna a noisy auto-oscillation was heard on my transmission. Well, the solution was quite simple and I recommend you to do the same if you encounter this problem.

In the image above you can see that I gather all my supply wires and addaptors in the same place and went to my wall outlet only with one plug. The idea was to use wires as short as possible so them will not act like an antenna.

Behringer Shark DSP110, Small Review

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I don’t see on the net too many reviews about this great microphone solution that can be used also in Ham Radio with the help of a W2IHY Technologies “Ibox” or a home made filter like this one. With the Shark DSP110 you got a microphone preamp with phantom power for the condenser mike, a very effective noise gate with learning feature, a good speech compressor and other features that does not apply in Ham Radio. Watch the movie above, it’s not the best review but you can make an idea of how this baby shark is working.


Have no fear sharky is here, Behringer Shark DSP 110

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My shack got improved with a new and beautiful Behringer Shark DSP110 as the mike preamp, noise gate and a small compression.

What can I say, I’m very pleased about this sharky, the noise-gate on the learning option are doing a very good job. If there was also an EQ, it would made a complete solution for ham radio high audio quality.

By the way, the audio sound sequence above is my modulation recorded from the main output of the mixer with my usual settings for the radio. I’m bla bla bla in Romanian, ayway you cand make an ideea about how all the audio chain it’s working.

Essb Interview

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Nu ma consider un impatimit al notiunii de ESSB, de fapt mi se pare destul de neplacut sa te intinzi cu emisiunea (largimea de banda) mai mult decat este nevoie pentru o comunicare de tip radioamator. Banuiesc ca nu sunt singurul ce este deranjat uneori de statii ce emit in frecvente alaturate si spleteresc la greu, in special fenomenul se resimte in banda de 40m care este destul de inghesuita si populata.

Totusi, atat timp cat se foloseste o largime de banda decenta, in cazul Kenwood-ului TS850s pe care-l detin 2.7 Khz pentru SSB, nu vad ce ar fi rau in folosirea unei post-procesari a semnalului de microfon. Un microfon bun, o mica egalizare a acestuia in functie de vocea operatorului, o pre-compresie, un gate/expand…. pot face minuni.

Va invit sa ascultati un interviu preluat de pe, pe tema acestui subiect.

Continue reading Essb Interview

Filtru / Atenuator pentru Kenwood TS850s


Am intercalat pe lantul audio al microfonului un mic montaj al carui scop este de a atenua iesirea de linie la nivelul intrarii de microfon si in acelasi timp realizeaza o decuplare galvanica eficienta intre Kenwood TS850s si restul echipamentelor audio.


Schema initiala apartine renumitului W2IHY dar un pic modificata conform necesitatilor de aici. Cu siguranta aceasta poate fi adaptata pentru a fi folosita si cu alte tipuri de transceivere.

Continue reading Filtru / Atenuator pentru Kenwood TS850s

The effect of bandwidth on speech inteligibility


Va recomand sa aruncati o privire asupra articolului scris de Jeff Rodman, The effect of bandwidth on speech inteligibility. Nu incurajez eSSB-ul deoarece mi se pare risipa de resurse si poate genera neplaceri altor statii prin diverse spletere sau fenomene adiacente. Cu toate acestea sunt de parere ca este bine sa dati atentie si calitatii audio pe care transmisia voastra o detine.

SSB – Single Side Band

(Subjective Descriptions)
@ -6dB Points
(Technical Descriptions)
Standard SSB (Narrow)
2 kHz
400 Hz ~ 2.4 kHz
Standard SSB (Medium)
2.4 kHz
300 Hz ~ 2.7 kHz
Standard SSB
2.7 kHz
200 Hz ~ 2.9 kHz
Standard SSB
2.9 kHz
100 Hz ~ 3.0 kHz

Kenwood TS850s detine un filtru de 2.7Khz ce se incadreaza in segmentul wide cu gama de frecvente de la 200 Hz la 2.9 kHz. Chiar HiFi putem spune, nu?