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WSPR - 160m BAND - 17-21/09/2017
WSPR 160m (1.80 - 1.87MHz) band activity data recorded for a 4 day period 17-21/09/2017
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)

TX Only

SSN (Sun Spot Number): 25 - 39

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.  

The below results clearly indicate that the Marconi T antenna configuration has significant performance improvement when compared to the Doublet antenna for long distance operation, however for local contact there was no noticeable performance difference between the two antennas. There was an approximately 10dB improvement with the Marconi T antenna when in contact with VK2KRR as compared with Doublet antenna.

 

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

  

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:VK6PK

Distance: 37km

Grid location: OF88ee   

dBm: 37

  

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