ESSB??

ESSB stand for Extended for SSB mode..normally, the audio will be at range 2.0khz - 2.5khz..but with ESSB, can be more wide..like example up to 5.0khz & all this must be comply with rules by ITU..see table below :

STANDARD SSB MODES (Subjective Descriptions)	BANDWIDTH	FREQUENCY RESPONSE @ -6dB Points	ITU DESIGNATOR (Technical Descriptions)
Standard SSB (Narrow)	2 kHz	400 Hz ~ 2.4 kHz	2K00J3E
Standard SSB (Medium)	2.4 kHz	300 Hz ~ 2.7 kHz	2K40J3E
Standard SSB (Wide-1)	2.7 kHz	200 Hz ~ 2.9 kHz	2K70J3E
Standard SSB (Wide-2)	2.9 kHz	100 Hz ~ 3.0 kHz	2K90J3E
EXTENDED SSB MODES (Subjective Descriptions)	BANDWIDTH	FREQUENCY RESPONSE @ -6dB Points	ITU DESIGNATOR (Technical Descriptions)
eSSB (Narrow-1)	3 kHz	100 Hz ~ 3.1 kHz	3K00J3E
eSSB (Narrow-2)	3.5 kHz	80 Hz ~ 3.58 kHz	3K50J3E
eSSB (Medium-1)	4 kHz	50 Hz ~ 4.05 kHz	4K00J3E
eSSB (Medium-2)	4.5 kHz	50 Hz ~ 4.55 kHz	4K50J3E
eSSB (Wide-1)	5 kHz	50 Hz ~ 5.05 kHz	5K00J3E
eSSB (Wide-2)	6 kHz	50 Hz ~ 6.05 kHz	6K00J3E
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Logically, all sound/audio equipment have humming..& how to cut this humming from going to the transceiver while TX..in this case, i have made one box, we called 'iBox'..all humming will be cut by some electronics inside the box..at the first i read at manual Equalizer, its will produce about +/-18db humming..& i was thinking how to make this noise not coming to my transceiver..have a very nice iBox done by W2IHY..it's so great ibox but i think another way how to homebrew it..with some idea given from somebody..i go to electronic shop to buy the thing..lucky they have it..i done the iBox about 1 hour..then i try..fuhhh!!! the is no humming/RF coming..this iBox cut about +/-23db..very happy & finally try to get 9M2ZAK to assist me to setting the audio..thanks ZAK for help..hehe..i will upload here some audio recorded done by ZAK soon..

4ch Mixer, 31 Band Equalizer & Audio Balancer

iBox - cut +/-23db

View inside iBox

iBox by W2IHY

iBox by 9M2ODY..hi hi

Overall view

Antenna farm