Hello Brian!
05 May 94 19:38, Brian Johnson wrote to All:
 BJ> I'd like to know how long a long-wire antenna must be in order to be
 BJ> appropriate for FAX and RTTY signals.  I'd also like to find out if 
here
 BJ> are any specialty antennas on the market that will enhance FAX and RTTY
 BJ> signals.  At present I've got a GROVE di-pole long wire (not up yet).
 BJ> What does the AEA antenna do that a long wire doesn't? How about the 
ONY
 BJ> AN-1? Happy Monitoring...Brian. -+- GEcho 1.00 + Origin: Gandalf's - San
 BJ> Diego, CA - USR DS - 619-466-9505 (1:202/302)
here is a table of possible antenna choice that indicates the best antenna 
for receiving at a specified distance.
The best antenna for DX would be a vertical with a good ground plane, but 
compromises have to be made, specially when you live in a condominium!
Path length (km)           radiation angle        most suitable antenna
0-200                      60-90 degrees          Hor. dipole 0.25 wavelength
                                                  above ground.
200-500                    40-70 degrees          Hor. dipole 0.3 wavelength
                                                  above ground.
500-1000                   25-50 degrees          0.24 wavelength vertical 
o-
                           10-20 degrees          nopole 0.5 wavelength above
                                                  ground.
1000-2000                  10-30 degrees          Vertical monopole 0.3 wave-
                           and low angles         length long with ground- 
screen.
2000-3000                  5-15 degrees           Vertical monopole 0.3 wave-
                           20-30 degrees          length long.
3000 and more              low angles             Vertical monopole up to 0.6
                                                  wavelength long with ground
                                                  screen.
I have a Sony AN-1, but the results are bad, and I use it only with a 
portable receiver.
I think the best active antenna is the HE-011 from Rohde & Schwarz, but the 
price is verry high (DEM 980).
For DX I using 2 longwire antennas (about 15m) in two different directions, 
and each longwire is coupled with the magnetic longwire balun from HF 
ystems.
After all experiments with antennas I have with this combination the best 
results.
Marius
--- GoldED 2.41
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