Activity on 75 AM

Discussion in 'Amplitude Modulation' started by KA4KOE, Nov 1, 2017.

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  1. K4KYV

    K4KYV Premium Subscriber Volunteer Moderator QRZ Page

    Nor do I 'get' the age-old tactic of starting up a SSB QSO 2 kc/s away from the carrier frequency of an AM QSO already in progress when there is a wide breadth of unoccupied frequency adjacent to both sides, then pissing 'n moaning about QRM from the "AM splatter".
     
    N7BDY likes this.
  2. N2DTS

    N2DTS Ham Member QRZ Page

    Well, if you ever switched to ssb on a modern rig, you might find you can get VERY close to an AM qso without it bothering you (on ssb) at all.
    I think many do not know they are causing problems with the AM people. Some do, and do it on purpose, but some don't know.
    Look at an sdr sometime and you can see ssb with 100 or so cycles separation of each other.

    Its different with AM. I was running 200 watts, which is not a wimpy signal on 40 meters.
    Yet someone is going to start a qso within 3 KHz of my signal?
    Lots of room around, yet someone had to start up 5 KHz away, and the other station can not zero beat and ends up 2 KHz high and 3 KHz away from our qso.
    Its just poor operating practice, qrm for no reason at all.
    One good thing about sdr radios is they allow you to see such things.
    We were on 7290, they were on 7285 and 7287.
    They could have been on 7282. No reason to stick with 5 KHz jumps.
     
  3. K5UJ

    K5UJ Ham Member QRZ Page

    Were these AM operators or slopbucketeers? On 40 m. it's possible you were skipping over them. At night, screwed up things happen due to different antennas in use. On 75 m. as the band goes long, guys with verticals inside 100 miles of me vanish first. Cloud burner dipoles are still Q5 for a while but eventually vanish. One guy 40 miles away will be solid copy but another operator 75 miles away will be almost unreadable. I'll think the frequency is empty then a strapper on the East coast will come back to the guy with the vertical, who is inaudible here but of course strapping out 700+ miles away. If I had not been on frequency earlier to know what was happening I might have started calling CQ on top of him.
     
  4. N2DTS

    N2DTS Ham Member QRZ Page

    AM guys. I did not get their calls.
    Both of the other guys were strong at my location and was Russ who I was talking to.
    Its possible one or both of them had very narrow receivers and could not hear me 3 KHz away, but that seems unlikely...
     
  5. KA4KOE

    KA4KOE Ham Member QRZ Page

    Yep, propagation at solar minimum is freeky-deeky, dude.
     

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