Top Band WSPR Revisited..MW0BBU. | RF Circuits

Friday, July 5, 2013

Top Band WSPR Revisited..MW0BBU.



Having some time on my hands I thought I would give 500mW of top band a go again...

Using the FT817nd and the SRC 66ft end fed I set about  the trial... 

The results were pretty good to be honest given that the antenna isn't exactly the best.. 


Small log of an hour's worth below...










Transmit log:


TimestampCallMHzSNRDriftGridPwrReporterRGridkmaz
 2011-07-04 22:42  MW0BBU  1.838100  -24  0  IO71lr  0.5  GM4SLV  IP90gg  975  12 
 2011-07-04 22:42  MW0BBU  1.838100  -18  0  IO71lr  0.5  G8HUH  IO81mg  153  109 
 2011-07-04 22:38  MW0BBU  1.838100  -28  0  IO71lr  0.5  PA2WO  JO21uf  746  90 
 2011-07-04 22:38  MW0BBU  1.838100  -21  0  IO71lr  0.5  G8HUH  IO81mg  153  109 
 2011-07-04 22:38  MW0BBU  1.838100  -15  0  IO71lr  0.5  G0KTN  IO81ti  189  102 
 2011-07-04 22:32  MW0BBU  1.838100  -23  0  IO71lr  0.5  PA2WO  JO21uf  746  90 
 2011-07-04 22:32  MW0BBU  1.838100  -19  0  IO71lr  0.5  G0KTN  IO81ti  189  102 
 2011-07-04 22:32  MW0BBU  1.838100  -21  0  IO71lr  0.5  G8HUH  IO81mg  153  109 
 2011-07-04 22:32  MW0BBU  1.838099  -26  0  IO71lr  0.5  GM4SLV  IP90gg  975  12 
 2011-07-04 22:24  MW0BBU  1.838100  -25  0  IO71lr  0.5  PA2WO  JO21uf  746  90 
 2011-07-04 22:24  MW0BBU  1.838100  -27  0  IO71lr  0.5  G8HUH  IO81mg  153  109 
 2011-07-04 22:24  MW0BBU  1.838099  -4  0  IO71lr  0.5  F6CNI  JN19qb  666  113 
 2011-07-04 22:24  MW0BBU  1.838100  -23  0  IO71lr  0.5  G0KTN  IO81ti  189  102 
 2011-07-04 22:16  MW0BBU  1.838100  -15  0  IO71lr  0.5  G0KTN  IO81ti  189  102 
 2011-07-04 22:16  MW0BBU  1.838100  -23  0  IO71lr  0.5  G8HUH  IO81mg  153  109 
 2011-07-04 22:08  MW0BBU  1.838100  -19  0  IO71lr  0.5  G8HUH  IO81mg  153  109 
 2011-07-04 22:08  MW0BBU  1.838100  -19  0  IO71lr  0.5  G0KTN  IO81ti  189  102 
 2011-07-04 22:08  MW0BBU  1.838099  -25  0  IO71lr  0.5  GM4SLV  IP90gg  975  12 
 2011-07-04 22:00  MW0BBU  1.838100  -18  0  IO71lr  0.5  G8HUH  IO81mg  153  109 
 2011-07-04 22:00  MW0BBU  1.838099  -27  0  IO71lr  0.5  GM4SLV  IP90gg  975  12 
 2011-07-04 22:00  MW0BBU  1.838100  -17  0  IO71lr  0.5  G0KTN  IO81ti  189  102 
 2011-07-04 21:50  MW0BBU  1.838100  -19  0  IO71lr  0.5  G8HUH  IO81mg  153  109 
 2011-07-04 21:50  MW0BBU  1.838101  -18  0  IO71lr  0.5  G0KTN  IO81ti  189  102 

Receive Log:


TimestampCallMHzSNRDriftGridPwrReporterRGridkmaz
 2011-07-04 22:44  M0PPP  1.838170  -18  0  IO93gm  2  MW0BBU  IO71lr  313  232 
 2011-07-04 22:36  M0PPP  1.838170  -18  0  IO93gm  2  MW0BBU  IO71lr  313  232 
 2011-07-04 22:30  F6CNI  1.838055  -3  0  JN19qb  10  MW0BBU  IO71lr  666  300 
 2011-07-04 22:14  M0PPP  1.838170  -18  0  IO93gm  2  MW0BBU  IO71lr  313  232 
 2011-07-04 22:04  M0PPP  1.838170  -27  0  IO93gm  0.5  MW0BBU  IO71lr  313  232 
 2011-07-04 21:52  F6CNI  1.838055  -4  0  JN19qb  5  MW0BBU  IO71lr  666  300
2013-07-04 21:44  M0PPP  1.838170  -27  0  IO93gm  0.5  MW0BBU  IO71lr  313 
 232 

Anyway what really surprised me was the station of GM4SLV, which is about as far as you can get in the U.K. recieved my signal.. good stuff..all of 975 km. 

Given that my antenna system is not the best on Top Band I am really impressed.. 

One other thing...

F6CNI who I received when his station was running 5w was -4db ,increased the power to 10w and was then -3db.... that's 1db increase for double the power... Interesting.

Steve..MW0BBU.


Addendum:

Many thanks to Bert PA1B for making this chart.....




It really does go to show what can be achieved with such tiny amounts of power.

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