Hi Rob, I've found this very helpful:
http://www.usinterface.com/IMDMeter.html Good luck and look for you on the bands. 73, Tony, AD1Y --- In digitalradio@yahoogroups.com, "charmquark69" <[EMAIL PROTECTED]> wrote: > > Hi all, > > just joined the group and have been using digital modes (=PSK only) > for a couple of weeks now. > > I've occasionally got a "bad modulation" report - two or three times > out of maybe fifty contacts - and was wondering how I could > personally check the modulation as the signal is transmitted. > > Here's the setup: FT-897D, microHam USB Interface II, HamRadio Deluxe > + HRD DigitalMaster (build 1628). TRX only on 14.070MHz at the > moment, Yaesu DIG mode set to PSK-U, processor off, ALC set really > low > > One thing I did notice yesterday - when I got a really uptight > message ("my g*d what a dirty signal" ...ouch) from someone who > didn't want to identify himself - was that the SWR had crept up from > 1:1 to near 2:1 as the shack (and the antenna tuner!) had been > warming up (it's getting cold here now!). > > But could this be the only reason for bad mod? And again, is there a > tool/piece of hardware/software I could use to check the cleanness > (or otherwise) of the signal AFTER it's left the TRX? Or is it > simply a case of having separate RX in the shack, tuned to my freq, > connected to the PC, and inspect the waterfall/spectrum there? > > TIA for any helpful comments, > 73, Rob (DK1ROB) >
