Long range requires a low gear

Long  range  requires a low gear ,

Following the  excellent  decode  of G0NBD by  RN6AM , at  a  range  of  some 2000  miles  with  part of the  path  in daylight , a night  time test  with  CO2DC  proved the  viability  of the ROS  data  mode’s  immunity to  path distortion , by  providing  decodes  over a  4400  mile  path in darkness , from 100 watts  to  a  35  ft  end  fed ground mounted vertical  Ae , reception  by 40  mtr  dipole

To date  the  5  meg band  has been  the  grave  yard  of  data  modes  , turbulent  and  unstable  propagation reducing end  stopping  signals  to  gibberish  , high  band noise adding  destructively to  the  drop  out rates  of psk  systems.

Full  decodes  where  obtained by  CO2DC at  all  speeds , with an impressive  100% decode  over a  5  minute period obtained  using the  low  range  HF-4 mode , designed to  provide  full  256 character  communications  in ”below noise”  ‘last  ditch’  situations

RX16: 01:01 @ 0,0 Hz: CQ de  G0NBD  in IO83lk  <STOP> -21 dB 
RX8: 01:06 @ 0,0 Hz: CQ de  G0NBD  in IO83lk  <STOP> -20 dB
RX4: 01:10 @ 2,0 Hz: CQ de G0NBD  <STOP> -21 dB
RX4: 01:11 @ 2,0 Hz: CQ de G0NBD  <STOP> -17 dB
RX4: 01:12 @ 2,0 Hz: CQ de G0NBD  <STOP> -20 dB
RX4: 01:13 @ 2,0 Hz: CQ de G0NBD  <STOP> -22 dB
RX4: 01:13 @ 2,0 Hz: CQ de G0NBD  <STOP> -19 dB
RX4: 01:14 @ 2,0 Hz: CQ de G0NBD  <STOP> -22 dB
RX4: 01:15 @ 2,0 Hz: CQ de G0NBD  IO83lk g0nbd@hotmail.com  <STOP> -21 dB
RX8: 01:16 @ 0,0 Hz: d i de G0NBD  I o83~0nbd@hotmail.com  <STOP> -20 dB
RX16: 01:16 @ 0,0 Hz: CQ de G0NBD  iðtt¦lk g0d@hotmail.n e <STOP> -21 dB
RX4: 01:17 @ 2,0 Hz: , 73. de G0NBD sk  <STOP> -19 dB

2 Responses to “Long range requires a low gear”

  1. José Alberto Nieto Ros Says:

    And here, a nice solution: 🙂

    https://rosmodem.wordpress.com/2011/03/02/antenna-selection/

  2. www.brillie.nl Says:

    V6.3.5 change my Antenna from 2 to 1 in FT2000. Antenna 1 is my 6 meter beam… nice problem…

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