How to improve audio quality in SSB

1 - Hi-Fi Hi-Fi SSB or SSB

In recent years some Amateur Radio and Amateur Radio 11m (27Mhz) interestedin improving their audio quality in order to obtain a modulation type studio orbroadcast quality and increasing the strength and quality of their radio.

2 - Technical Data

SSB (SSB) by default uses a "signal width (or bandwidth) to optimize the reducedspace consumption frequency.

SSB bandwidth occupies half the bandwidth of the AM.

The TX-traditional filters have "SSB" between 2 and 2.4 kHz to obtain a quality ofcommunication such as "telephone".

To make the SSB audio enhancement, and get a quality radio, it should send andreceive (TX-RX) with a minimum bandwidth of 2.7 kHz.

To make HIFI-SSB should use a bandwidth of 5 kHz (which leads to changes tothe transceivers) ...

SSB traditional

SSB extended

Source Tables: NU9N

3 - Implementation

RA & Audiophiles of 11 meters is determined to improve the quality of their audiousing professional studio equipment in their stations.
Studio microphones, equalizers, compressors, preamps, "Virtualization"Feedback Destroyer "...

The TX modern offer the opportunity to receive and transmit with sufficient bandwidth (2.7 kHz).

4 - Interest & cons

The value of the "HIFI-SSB is able to transmit with superb audio quality worthy ofsome professional radio studios, and the headset (which has between 2.7 kHzand 5 kHz bandwidth RX) can enjoy radio with high and low tones and depth in fine voice.

The disadvantage is that everyone does not use enough bandwidth (2.7KHz) inreceipt of some 11 m and OM Amateur (with old equipment or CB) that receivethese stations' HIFI-SSB "complain audio is "empty", "deaf" or "fade"listening.

5 - Choix du matériel 

A noter que certains produits sont dotés de plusieurs fonctions et qu’il n’est pas rare de trouver des produits comprenant plusieurs éléments pour ce qui concerne des racks ex : préampli + noisegate + compresseur.

The microphone

It should use a good quality microphone to render a clear radio and the impedancematch to your TX, its bandwidth should be between 20 Hz and 20KHz tone for a refund of the perfect voice.
it goes without saying that it is a centerpiece in the audio system.


In Heil Sound (Middle range from 150 to 300 Euros)
For amounts more consistent with Neumann, Rode or Electrovoice microphonesthat produce mid-range professionals see high-end (1000 Euros and many more ...).

The preamplifier

He will give strength and volume on the radio and that will increase the consistencyof the carrier SSB (approaching the peak power of the TX) can be tube (warmer)or SSD (less used).

The compressor

It increases a little more power modulation.

The equalizer

It is the centerpiece of the system will allow it to adjust the audio output to changethe treble and bass, it will give the effect of 3D audio there are graphics (hand) anddigital (option to store its settings).

The fireworks extra

"Feedback Destroyer" (cutting the rear of the microphone noise therebyincreasing the preamp)
"Virtualizer" (special effects generators including reverb) and many others ...

6 - Invest least simplifying the matter

For those who wish to improve and main "push"a bit of their audio withoutinvesting much money or complicate the matter, I recommend a W2IHY 8-bandequalizer + a Micro Heil PR-20, PR-781 or Gold Line.

The audio will be improved significantly with a smaller budget and beginnerknowledge are sufficient.

The W2IHY is sold by mail in the USA by Mr Julius, who is a Ham listening andhaving a very good customer service (provided they can speak English technical).

The device connects easily and can really increase the final quality modulation andincludes a graphic equalizer, a preamplifier and a gate (to come feedbackdestroyer off the sound from the rear).
The budget will still be about 390 Euros Micro Heil W2IHY + + Cables.

7 - HIFI-SSB computerized processing

It is possible to make "HIFI-SSB" by computer processing, there are severalsolutions for this.

1 - In having a USB microphone with audio will be processed through a treatment program on the PC computer, all emerge on a preamplifier, to finish on the TX.

2 - By owning a PC, a microphone that comes right through the sound card (goodquality) processed by a program exits to a preamplifier and then finally to the TX.

8 - Links (links)

9 - OM against the HIFI-SSB

OM are some cons of this new technology also here are some lines from apopular forum

"Another new drift of ham radio! regulation states:"For all classes of emissionand in all bands, the bandwidth transmitted does not exceed that necessary forproper reception.

"The Hi-Fi SSB" does absolutely not in the way of ham radio and is against thecurrent regulations. "

"The future of ham radio is going in the direction that it expects the international regulations and not to do the opposite for the sole reason to be happy. "

"If you find that the" Hi-Fi SSB "addresses only a reasonable portion of thesecriteria without going against the other, then go ahead, enjoy!

Otherwise, do not promote it because it is only very little to do with ham radio and its evolution in a constructive and sustainable if possible. "

"The rest realized with analog hardware that is only to satisfy the ego operatorwho missed their vocation as speaker in the world of broadcast, is outdated andunnecessary (see really bad) to establish a contact between two operators in the amateur service. "

10 - Conclusion 

I personally think that the "HIFI-SSB" is a "technology" very interesting. 

We can also really speak of 'technology', especially when addressing the connection settings and full racks and all this requires considerable time and personal investment. 

This hurts me more, is that everyone has not yet received enough bandwidth to enjoy this audio will require the operator who made "HIFI-SSB" acknowledge this fact and in all humility he drops a little low and treble its "modulation" so that the operator is in front of him to listen properly. 

There is also the price of all audio may stop because once one gets down to business it becomes truly luxury but some say that passion is priceless. 

Finally, over time, operators will increasingly be able to listen and appreciate the "HIFI-SSB", particularly with the advent of these new transceivers whose receive filters are adjustable (DSP) each Anyway, if they do not practice this "technology" at least he will finally listen and appreciate ... 

I think to conclude that it is therefore a technology that has a future ...

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