I am very curious about this ESSB mode....I am getting my K3 in a few weeks, and wonder what it sounds like with a normal SSB receiver using something like 2.8 KHz filter. Does it sound better/worse/distorted? Or can you hear no difference unless you have a wider receive filter? Since most people just have standard SSB filters, I am curious to know if you can use the mode with others, or only with ESSB-equipped stations. TNX and VY 73, Lance
-- Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8) P.O. Box 73 Frenchtown, MT 59834 USA ------------------------------- On-air testing shows FB reports and frequent enthusiastic responses from those using "conventional" SSB receivers. That seems to be because a significant improvement in high frequency response clearly helps intelligibility and the "naturalness" of the audio. It is true that narrower bandwidths have been the standard in communications for years, but that standard is based on a compromise between minimum channel width and intelligibility. "Compromise" is the operative word. There's plenty of evidence that using a little more bandwidth can improve the quality and intelligibility of speech. Ideally, the receiving end should have a filter bandwidth matching the transmitted signal, but no filter has a "brick wall" cutoff, no matter what the ads say. So adding some high frequencies out around the high frequency roll-off point of a normal SSB filter still adds significantly to the high frequencies heard, even on a non-ESSB receiver. The K3 still limits audio below 200-300 Hz at the lower frequency end. That avoids wasting lots of power in lower audio frequencies, but it does prevent those who are interested from doing a "big broadcast" voice with lots of bass pre-emphasis on the ham bands. The K3's transmit bandwidth can be controlled so you don't need to greatly exceed the normal bandwidth transmitting ESSB. When talking to someone using a conventional SSB receiver, there's probably not much advantage in going over 3.5 kHz bandwidth - perhaps even less - unless his receiver has a rather poor filter. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
