Good Day Jeff I have a small uhf ham system ( 5 uhf+1 VHF +hub) all linked via a central HUB.
All of the repeaters are de-emphasised and pre-emphasised at each point. I always have read about the many repeater owners that go on and on about Flat audio and now the first time I want to do anything to the audio there is a stumbling block. How do these repeater owners deal with this? Look forward to your response. Brad ZS5WT --- [EMAIL PROTECTED] wrote: > > 4 ms attack and 100 ms decay is more like a fast > limiter than a > compressor. 4 ms is only 2 cycles at 500 Hz which > is in the "meat" of > the voice region. > > Unless you use a de-emphasis network and low-pass > filter in the side > chain you're not going to be happy with the > compressor even if you > slowed down the time constants. The response "tilt" > that you have when > running "flat audio" (really preemphasized audio) > through the compressor > combined with the HF noise that's present any time > the signal is > anything less than DFQ will drive it into excessive > gain reduction. You > didn't say what the design of the control stage was, > but judging by the > attack time, I'm guessing it's a peak detector which > would likely > exacerbate the problem with regard to the HF noise > response. > > See a blurb I wrote a few years ago on > repeater-builder.com regarding > audio processing in narrowband FM for some more > info. > > --- Jeff > > > > -----Original Message----- > > From: [email protected] > > [mailto:[EMAIL PROTECTED] On > Behalf Of bradley glen > > Sent: Tuesday, November 22, 2005 5:19 PM > > To: [email protected] > > Subject: [Repeater-Builder] Flat audio -use of > compressor > > > > > > Good Day > > > > I would like to have comment on the use of the > > compressor on the repeater hardware between the rx > and > > tx units , with that repeater run up using the > "flat > > audio principle." > > > > What will happen to the existing audio's > attack/decay > > stats? > > > > The expeimental unit made for this test- specs for > > 4ms/100ms Attack/Decay repectively . > > > > Thanks Brad > > > > > > > > __________________________________ > > Yahoo! FareChase: Search multiple travel sites in > one click. > http://farechase.yahoo.com > > > > > > Yahoo! Groups Links > > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.362 / Virus Database: 267.13.5/177 - > Release Date: > 11/21/2005 > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.362 / Virus Database: 267.13.5/177 - > Release Date: > 11/21/2005 > > > > > > > > Yahoo! Groups Links > > > [EMAIL PROTECTED] > > > > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
