Dear Jose, I think the problem may be that your TS140 does not have an AM filter. If that is the case, then it is trying to squeeze all of a 6 kHz AM signal through a 2.3 or 2.7 kHz wide SSB filter. It appears to lose al ot of sensitivity, especially on the higher audio frequencies. You will generally find the sensitivity of the receiver sufficient for hearing AM. I do prefer Yaesu rigs on AM over a Kenwood, however, your TS140s certainly ought to be sensitive enough to hear the guys on AM from around Europe.
What bands are you using? Perhpas you can consult with some of the fellows like my friend Dave, G3UUR who is a regular on 160m, 80m, 20m and 10m AM. He is close enough that you ought to be abable to hear each other well. He also knows a number of other active G-stations using AM. Brian On 2 Oct 2005 at 20:57, Jose HF Silva wrote: > Hi, ALL > > Having much more difficulties to receive AM compared > to SSB... went to the manual of my TS-140S and found > there, perhaps, a strong reason for it: AM requires > 2.5uV while SSB goes with only .25uV (at 10dB S+N/N)! > > Why is it so? > > Does it apply to all standard HF sets? > > What's the best possible value for AM on Ham rigs? > > Many thanks in advance for clarifying me on this > question. > > 73 > > de Jose Silva > CT1AXG > > > > __________________________________ > Yahoo! Mail - PC Magazine Editors' Choice 2005 > http://mail.yahoo.com > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami >
