QRP AM with the Four state qrp Nouveau kit

Discussion in 'QRP Corner' started by N2DTS, Oct 21, 2019.

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  1. N2DTS

    N2DTS Ham Member QRZ Page

    New Jersey to Gerorga solid copy with good audio both ways, this kit really works well in every respect!
    5 watts carrier output, easy to build, inexpensive and it even includes the hand microphone.

    KC7JNJ likes this.
  2. K8JD

    K8JD Ham Member QRZ Page

    Put that on 75 M and get blasted out of town with the reworked AMBC transmitters the big guys all have. :rolleyes:
  3. N2DTS

    N2DTS Ham Member QRZ Page

    Made LOTS of nice QSO's with it.
    I get reports the signal is strong and no problem to copy.

    We tend to take turns on AM so I do not get 'blasted' by anyone.
    I make shorter transmissions running low power (a very good thing) but I have worked 20 people in a few days with solid reports.
    Its very odd, but if a signal is fairly strong in my receive, they can hear me no problem at all.
    Even weak signals can copy some of my signal, which I did not expect.

    The receiver in the Nouveau 75 seems to be very sensitive and the weak signal copy is as good as my flex 5000 or homebrew RX.
    It can distort on really strong signals with a lot of bass response a bit.

    Around here, lots of people run 100 watt (carrier) rigs like DX100's and so on, or Rangers at 35 or 40 watts.
    500 mile range seems to be normal even with lower power if the antenna is good.

    Got a short ground mounted vertical antenna with no radials, skip this rig.

    KU4FL and KC7JNJ like this.
  4. W9YAP

    W9YAP XML Subscriber QRZ Page

    What kind of antenna are you using?
  5. N2DTS

    N2DTS Ham Member QRZ Page

    80 meter dipole, up 45 feet, coax fed, no tuner (its got a low SWR).
    Seems if I can hear them well, they hear me well enough.
    Close in QRM can take me out, so its not as good as a 300 watt rig...

    I do shorter transmissions and shorter QSO's when doing QRP but its fun to make solid contacts with such a simple rig.
  6. N2DTS

    N2DTS Ham Member QRZ Page

    Best so far is 600 miles for a solid S9 with 4 watts carrier output on battery power.
  7. W9YAP

    W9YAP XML Subscriber QRZ Page

    Oh boy....Every time this thread moves up to the top I end up visiting the 4SQRP site:oops:

    I love my Muriana and next on the workbench is the Ozark...What to do, what to do...
    WA4CZD likes this.
  8. N2DTS

    N2DTS Ham Member QRZ Page

    I have done some changes to the radio to allow the use of a D104 microphone with it.
    I just separated the audio from the PTT.
    The D104 sounds fantastic in it and I get great reports.

    I bought an amplifier but the radio over drives it, looking for a way t reduce the power out to 1 or 2 watts to drive the amp to 20 watts (carrier) for QRO operation.

    But lots of fun at the 5 watt level.
    Power drain is very light so running off a gel cell is no problem at all.
  9. N2DTS

    N2DTS Ham Member QRZ Page

    RX, 15 volts, 135 ma
    TX output 5 watts carrier, 780 ma, 1.7 amps at 100% modulation (about 16 watts pep).
    On a 12 volt gel cell, I get a little over 4 watts carrier.
  10. W9BRD

    W9BRD Ham Member QRZ Page

    Build a pi attenuator; you can design one with the help of the calculator at https://chemandy.com/calculators/matching-pi-attenuator-calculator.htm. To reduce power by a factor of 5, you need a 7-dB attenuator; a factor of 4, 6 dB; a factor of 2, 3 dB. Build the attenuator with two parallelled 3-W metal oxide film resistors (a good source: digikey.com) for each of its three resistances, and it'll easily handle 10-minute transmissions with a 5 W carrier.

    You can build it into a Twinings tea can and equip it with RCA and/or BNC jacks, and it'll work just fine.

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