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Data from the WSPR web site relating to
monitoring from VK6YSF Northam Western Australia.
WSPR
Frequency: Dial 1.8366MHz USB (occupied bandwidth 1.8380 -
1.8382 MHz)
Grid location: OF88II
Local Time = +8:00 hours (0:00 =
8:00AM)
RX
and TX
SSN (Sun Spot Number): 0
Equipment: TS-930 at
5W, Radio computer
interface
Antenna#1: Multi-band
dipole with T-Match tuner and 4-1
Current Balun
Antenna#2: 'T"
Antenna configuration with T-Match tuner
This
exercise was to compare the Multi-band dipole antenna with the same
antenna configured as a ’T’ Antenna used for operations on
the 160m amateur band.
The
main HF antenna is an All Band Doublet feed with ladder line and
matched with a T-Match antenna tuner including a 1:4 current balun
giving access to all HF band including the 160m band. With a view to
get better performance particularly on lower frequency bands this
antenna was reconfigured as a type of Marconi ‘T’ Antenna by
simple bonding the ladder line in the shack and connecting directly
to the T-Match antenna tuner.
This
antenna requires a counterpoise to work well and this will achieved
at least initially by using the galvanized building roof to serve
this purpose.
Conclusion
While
the Marconi ‘T’ Antenna configuration has clear advantages over
relatively long distance communication within the 160m band when
compared to the All Band Doublet. The Marconi ‘T’ Antenna as I
currently have it configured is prone to much greater noise making
it worse as a receive antenna when compared to the All Band Doublet.
WSPR
data has been graphed using Excel. Horizontal axis = UTC Time,
Vertical axis = dB below the noise floor.
Antenna#1:
Multi-band
dipole
with T-Match
tuner
and 4-1
Current Balun
Antenna#2:
'T"
Antenna configuration
with T-Match
tuner
VK6YSF
WSPR Signal received by: VK2KRR
The Rock, NSW Australia
Distance:
2832km
Grid
location: QF34mr
dBm:
37 (5 Watts)
WSPR
data has been graphed using Excel. Horizontal axis = UTC Time,
Vertical axis = dB below the noise floor.
Antenna#1:
Multi-band
dipole
with T-Match
tuner
and 4-1
Current Balun
Antenna#2:
'T"
Antenna configuration
with T-Match
tuner
VK6YSF
WSPR Signal received by: VK5MR
South Australia
Distance:
1921km
Grid
location: PF89kk
dBm:
37 (5 Watts)
WSPR
data has been graphed using Excel. Horizontal axis = UTC Time,
Vertical axis = dB below the noise floor.
Antenna#1:
Multi-band
dipole
with T-Match
tuner
and 4-1
Current Balun
Antenna#2:
'T"
Antenna configuration
with T-Match
tuner
VK6YSF
WSPR Signal received by: VK5PJ
South Australia
Distance:
2101km
Grid
location: PF95mk
dBm:
37 (5 Watts)
WSPR
data has been graphed using Excel. Horizontal axis = UTC Time,
Vertical axis = dB below the noise floor.
Antenna#1:
Multi-band
dipole
with T-Match
tuner
and 4-1
Current Balun
Antenna#2:
'T"
Antenna configuration
with T-Match
tuner
VK6YSF
WSPR Signal received by: VK6HP
West Australia
Distance:
91km
Grid
location: OF77ww
dBm:
37 (5 Watts)
WSPR
data has been graphed using Excel. Horizontal axis = UTC Time,
Vertical axis = dB below the noise floor.
Antenna#1:
Multi-band
dipole
with T-Match
tuner
and 4-1
Current Balun
Antenna#2:
'T"
Antenna configuration
with T-Match
tuner
RECEIVED:
VK2EFM
Distance:
3233km
Grid
location: QF56pn
dBm:
37 (5 Watts)
WSPR
data has been graphed using Excel. Horizontal axis = UTC Time,
Vertical axis = dB below the noise floor.
Antenna#1:
Multi-band
dipole
with T-Match
tuner
and 4-1
Current Balun
Antenna#2:
'T"
Antenna configuration
with T-Match
tuner
RECEIVED:
VK6HP
Distance:
91km
Grid
location: OF77ww
dBm:
40 (10 Watts)
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