Hi Guys, For optimal ALE reception you want your RX passband set to 1625hz when using less than 2.8 or 3.0Khz IF filtering, anyone running a ham rig with the typical 2.1 to 2.7 filtering will need to enable IF shift and move it up in frequency else you are starving the modem from seeing all 8FSK tones properly. Depending on the particular software tool being used for ALE intercept this can be seen visual if a tuning display is provided, such as the TUNE Tones display in PC-ALE and the water fall in MultiPSK.
/s/ Steve, N2CKH At 12:50 PM 2/24/2007, you wrote: >The ICOM 756 Pro 2 centers on 1500 Hz. If anyone knows if you can change >the center, I would like to know how to do it. My preference would be >1000 Hz since it makes it easier to increment one kHz from the dial >frequency. > >As mentioned to Jose, the correct frequency you were operating on was >14.111, not 14110. > >SSB nets are not running digital modes and their frequency is the dial >frequency, whether USB or LSB. CW nets are based on the zero beat >frequency, but different rigs have different CW offsets. Many rigs have >the ability for the operator to change the CW pitch to center the >received audio frequency in the filters as well as meet operator >preference. The other operator has no idea that you are doing this as >long as you are zero beat on the frequency. > >KV9U > > >John Bradley wrote: > > > I appologize, since I didn't realise that it is equipment > defficiencies which do not allow you to change from the 1500hz center point. > > It must be an Icom thing, since the Kenwood equipment I am using > permits centering on 1000,1500, or 2210 hz. > > > > I think that you should take up your cause with all the many > digital, RTTY and SSB nets around the world who only specify > > a VFO frequency as opposed to the exact frequency of the offset > or sideband in use. It certainly is a "slap in the face" to good > operating practices and should not be condoned by experienced > operators anywhere. > > > > Some remedial math might also be in order since 14109.5 + 1500hz > is 14111.0 ( not that this supports my argument or anything) > > > > "Nuf said, will continue to bumble along with VFO frequencies, > trusting that others can deal with the vagarities of their equipment, > > and hope that we can co-exist for the common good. > > > > somewhat tongue-in-cheek, > > > > > > John > > VE5MU > > > > > > > > > > > > > >------------------------------------------------------------------- > ----------- > > > > > > No virus found in this incoming message. > > Checked by AVG Free Edition. > > Version: 7.5.446 / Virus Database: 268.18.3/699 - Release Date: > 2/23/2007 1:26 PM > > > > > > > > > >------------------------------------------------------------------------ > > > >No virus found in this incoming message. > >Checked by AVG Free Edition. > >Version: 7.5.446 / Virus Database: 268.18.3/699 - Release Date: > 2/23/2007 1:26 PM > > > > > > > > > >Announce your digital presence via our DX Cluster >telnet://cluster.dynalias.org > >Our other groups: > >http://groups.yahoo.com/group/dxlist/ >http://groups.yahoo.com/group/themixwgroup >http://groups.yahoo.com/group/contesting >http://groups.yahoo.com/group/wnyar >http://groups.yahoo.com/group/Omnibus97 > > >Yahoo! Groups Links > > >
