Essb Audio Software

Posted By admin  On 17.09.21

Transmit audio is a very subjective topic but most people would agree that it's possible to get reasonable results with the Kenwood TS-590S. The audio EQ profile tool allows the user to boost any slider by +6 dB from the 0 dB baseline and cut any slider by -24 dB for a whopping adjustment range of 30 dB. Welcome to Synapse Audio Software, we made the best VST Synthesizers: DUNE 3, The Legend, Obsession and Rack Extensions: Antidote, GQ-7 and more. Welcome to Audacity Audacity® is free, open source, cross-platform audio software for multi-track recording and editing. Audacity is available for Windows®, Mac®, GNU/Linux® and other operating systems. Check our feature list, Wiki and Forum. Download Audacity 2.1.3 Mar 17th, 2017: Audacity. Modular audio software for live electronic music performance, composition and experimental sound. Now for Mac and PC. ESSB can mean two things. Extended Single Side Band or Enhanced Single Side Band. Single side band refers to the most common mode of voice operations on the ham bands. It’s a whole long story explaining what that means so I’ll let Wikipedia do that. Extended refers to having an audio passband and overall signal bandwidth 4kHz and wider.


I have now spent a bit of time experimenting with transmit audio from the SDR. In the first instance I purchased a stock Yaesu fist mic that plugged straight in to the front SDR panel and provided me ptt control. A mic lead ran from the back of the SDR and then into input 1 of the Edirol. Initial reports on my audio suggested that I had a very slight echo on my signal - it wasn't unpleasant to the listener - but was noticeable. In speaking to various people already using the SDR, it was suggested that this echo would be eliminated by having a mic plugged directly into the Edirol rather than going via the SDR. This would also involve me hooking up a separate ptt line to the radio unless I wanted to use VOX or the mouse to key the radio. At the same time I was receiving information that people using the Behringer B-1 mic along with the Behringer 802 mixer were getting good audio reports. After shopping around I found that the same supplier of the Edirol FA-66 offered these other products at very competitive pricing and the mic compared very favorably in comparison to the Heil line up. Christmas arrived and a B-1 and 802 arrived..
However by October 2007, I found that despite constant tweaking, the B-1 condenser microphone could not be adjusted to give me a consistently good audio report. Too much background noise and sensitivity. I emailed Heil directly and received a reply from Bob Heil who suggested the PR-781. Part of Bob's reply read:

'Condenser microphones are just a tragedy. Yes..a tragedy ! They should NEVER be used in ANY amateur radio, live stage or broadcast application. They have WAY too much gain and cause so many problems in each situation. Phase cancellation between the unwanted sounds they hear and the direct sound you are TRYING to hear gives every one of them a 'strange' sound. Just too sensitive. Condenser mics were developed to record a quiet oboe or violins in the corner of a VERY controlled recording studio. Placing them outside of this venue brings on nothing short of disasters. Too much gain. They pick up everything for 50 feet (or more) and with amateur radio, they are just simply horrible. WAY too much gain and you have to contend with that ridiculous phantom power for the electronics inside which ends up as an 'antenna' causing excessive RFI problems.'

Pretty strong stuff! You can read the full email by clicking here. The PR-781 has XLR inputs, so it was very easy to remove the B-1 and swap them straight over. As the PR-781 is a dynamic microphone the 48V phantom supply voltage is not required. I haven't given up on the B1 mic and am still playing with my settings. See below for a sample audio recording.

I initially borrowed a Heil boom to mount the mic. (There appears to be nothing else on the market like the Heil product - and it is very good.) I had previously made a ptt cable connected to the front of the SDR mic input. My transmit audio flows from the PR-781 positioned by the Heil boom, into the 802 mixer and in turn feeding into the FA-66, ptt controlled by my hand made control cable.




The PR-781 in the operating position.

The Behringer B1 microphone in its' operating position.


The PTT device I made showing the push-button switch at the top, and two inputs for rig cables.


'Audio quality is in the ear of the listener' Below are some pictures showing the SDR settings.



This image shows the GUI of the SDR. For those familiar with the software, you can see the on buttons showing yellow, Spur Reduction on, Mic Gain at 15, Compression off, CPDR on at 3, RX off & TX EQ enabled and 2.9K receive filter. (As a footnote to this image, you can see the nice clean signal being transmitted at around 14.192MHz, in comparison to the splatter being caused by the station transmitting at 14.220MHz)



This image shows the current EQ settings that I have tailored for my voice. I found that the 3 band EQ easier to use than the 10 band. Notice I have a little bit of transmit pre-amp enabled - this seems to 'boost' the audio without increasing the ALC. Why the effort? Well if you have a look at the image below, you will see that after some EQ, my signal is more flat letting me achieve a better audio spectrum across the bandwidth I am using. This is particularly important for a good SSB signal. I could do some more work with the audio to achieve an even flat-er signal...



To achieve the following graphs, I used HamAlyzer software - which is available over the internet at US$30.00 - there are lots more expensive programs available - but this one works for me. To run the software I set the SDR with VAC enabled, and I used the virtual cable to feed the HamAlyzer input.



This image shows the SDR with no EQ - you can see the base in my audio signal - which in reality sounds deep and 'muffled'. The following images all have a bit of EQ'ing using both the Behringer & FlexRadio software.

This image shows the general audio spectrum I am using for normal voice communications. You can see the obvious difference with the audio much flatter and just tapering down from low to high. This setting seems to give generally good reports.


This image shows my setting when chasing DX and using a smaller audio bandwidth. Again the audio is nice and flat.



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This image shows the comparison between normal and dx modes. You can see the base and top which takes away the tin type sound of dx transmission.



Just for something different here is an audio graph with my radio set to transmit with a 4KHz audio bandwidth - ESSB?, I don't use this mode, but thought I would have a look at what could be achieved. I think for this type of audio I would need to spend some time 'tweaking'.
This image shows the comparison between ESSB type audio and DX type audio - you can see that in crowded band conditions there would be problems with ESSB.


**November 2007** Here is a recording of some of the audio adjustments I have found using the FlexRadio software. I am using the Behringer B1 mic and the Behringer 802 mixer. The mp3 file is 337Kb in size.
Here is another mp3 audio recording made of my transmitted signal using a transmit 3KHz bandwidth received by Peter - SM5HUA on 14.178MHz on 19/11/2007. The mp3 file is 421Kb in size. Peter is a member of the voodoo essb audio crew and is using the renowned TS950SDX, Peter's web site is well worth a look to get more information on ESSB audio settings and equipment!

As a general disclaimer, I am not involved with ESSB - so apologies if I haven't described ESSB in context per above information. I am also aware that received audio is not always the same between two stations - depending on equipment, band filter settings, DSP, signal strength, etc etc. Therefore the best gauge when establishing your own settings is to use the monitor function on the SDR, and / or a separate radio in your shack and software such as what is shown above. I discovered a really good web site by W3OZ that simplifies the explanation why it is important to have good audio - a link to this site can be found by clicking here.
After playing over a few more weeks, I decided to invest in an EQplus by W2IHY. I was looking for something to give me just a tad more presence to my transmitted signal and after listening to the audio recordings on the W2IHY web site I took the opportunity to order one at the same time as a friend of mine was doing the same. Before I ordered I sent a few emails asking questions to Julius W2IHY - and he answered all emails very quickly. The local UK distributor did a bit of a deal for two units and a couple of days later it arrived...


Above pictures with kind permission from Julius W2IHY


Connecting cables to the EQplus is straightforward, audio in and out can be done via 5 pin DIN plugs - I ordered a few metalised connectors from the local component store along with some screened mic cable. The EQplus doesn't facilitate a 48V phantom supply, so I connected the Heil PR-781 dynamic mic. The audio out goes straight into the Edirol FA-66 and the Behringer mixer is not used.



There are several settings to play with, including an equalizer, compression & downward expander and an effects setting. I found I needed to increase the mic gain on the Flexradio software in comparison to the previous set-up. I tweaked the settings through a combination of using a second radio and headphones as well as the HamAlyzer software. Final tweaking was done through the help of very local stations to my QTH. The picture below shows the dials all in opertaing their position.



Sfx file. I've got to say that I was a bit sceptical before I used this product. But in actual fact it has enhanced my audio quality. Unsolicited good audio reports are fairly common. Stations often comment that I sound 'louder' than what is reflected on their S meters. This to me is 'presence' on the transmit signal. I have a couple of transmit settings - ranging from a DX mode, through to narrow voice, medium voice and wideband Enhanced SSB. In the medium setting (100Hz to 3100Hz), audio reports are generally very good for ragchew mode. I have slightly adjusted the equalizer using monitor headphones with the EQplus. The downward compander works better than the software noisegate - which makes the audio choppy, with the

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downward compander I have been able to set it to get rid of background noise without introducing any chop to my signal. I also have a miniscual amount of reverb introduced to 'polish' the signal. When I get the chance I shall 'graph' the audio output. The EQplus allows an audio passband of about 5KHz, Julius has provided details to replace two capacitors that will open up the passband to 10KHz. At this point in time I do not intend to do this mod.
**24/04/2007** Recently I started to get feedback that it appeared that there was RF getting into my audio. When I monitored transmit audio through the monitor function on the SDR radio as well as a separate receiver, indeed my audio appeared to crackle and distort when transmitting. I spent some time tidying up cables, ensuring ferrites were fitted, cables earthed etc etc. Yet the audio distortion was still there. I then noticed that CPU usage was running at close to 100% upon transmit - in the recent past I had installed a couple of new programs on the PC that are resource hungry. By uninstalling these programs, CPU usage dropped - and no more glitches in audio and back to good reports. This is a useful footnote to be aware of.
Below are a couple of pics of the microphone and audio feed for the SDR radio.

I have managed to use the Behringer shock mount with the PR-781 microphone - bit of a tight fit but it works. The shock mount significantly reduces 'desk' noise!


N2RIT ESSB Audio Equipment

The introduction of the Behringer Shark DSP110 was tried in conjunction with the condenser microphone which was too very sensitive, I am now using it with the Heil PR-781. The DSP110 provides a good boost to the dynamic mic and the noise gate is very effective - it has the best noise gate that I have tried to date.


Essb Audio Software Reviews

The W2IHY 8 band audio equalizer does exactly what it is claimed to do. Audio is 'brightened' up.

WB Audio Section: K6JRF 10/7/2008

Audio is fed thrugh to the W2IHY EQplus where I have a little tailoring using compression, downward expander and effects processor.

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The three products together!

Essb Audio Software