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ly1hex / hardrock-50

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Low PEP Power reading #7

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
On transmit, power display is low on all band.  These are the readings on my 
system (SN:1002)

        Ext SWR Meter   DISP
Band    PWR-IN  SWR-IN  PWR-OUT PWR
160 4.60    1.32    48.00   38.00
80  4.90    1.18    60.00   45.00
40  4.80    1.12    54.00   38.00
30  4.80    1.08    52.00   36.00
20  4.70    1.08    57.00   39.00
17  4.60    1.06    57.00   39.00
15  4.80    1.06    55.00   35.00
12  4.80    1.07    46.00   29.00
10  4.60    1.06    35.00   20.00
6   4.50    1.05    34.00   20.00

Power out column was measured using a 5W-2012 Digital SWR Meter, with the 
amplifier into a 50 Ohm dummy load. 

Not sure about the present code.  I have used a calibration factor per band to 
bring the power measured by the bridge closer actual output power.

Replacing the 1N914s in the SWR bridge with 1N5711 diodes should also improve 
linearity.

Javier

Original issue reported on code.google.com by KC2QII@gmail.com on 26 Aug 2012 at 12:15

GoogleCodeExporter commented 8 years ago 
Will watch this to see if the calculations need to be updated.

Original comment by cp...@hobbypcb.com on 2 Oct 2012 at 3:30