Re: Transmit Output Power (CW) #v5

Rob French (KC4UPR)
 

Alrighty... I finally got around to a couple of things:

(1) Building myself a "digital dummy load" using my QRP Labs 20W dummy load and an Arduino.  I calibrated it against my ATU's wattmeter, which isn't probably a great source, but I used the output power of my RS-HFIQ, which I feel is pretty accurate at 5W +/- a little.
(2) Reset RV1 to the "stock" configuration, about mid-range.  Also tweaked my BFO setting to make sure I was getting some power out with both 300 Hz and 3000 Hz audio.
(3) Hooked up the mic input to my computer so I could play those 300, 3000, and 700-1900 Hz tone wave files into it.

Here are my results in the "essentially stock" configuration.

Transmit configuration:                      
  Factory (RV1 at center)                    
  BFO=11,055,935                    
Power measurement:                      
  ATU N7DDC ATU from Russia; configured for 150W                  
  DDL Digital Dummy Load; configured for QRP; calibrated against ATU at 5.3W w/ RS-HFIQ                  
                       
    CW       300Hz SSB   3000 Hz SSB   2-tone SSB  
Frequency SWR Watts-ATU Watts-DDL   Sideband Watts-ATU Watts-DDL Watts-ATU Watts-DDL Watts-ATU Watts-DDL
3500000 1.00 7.20 7.35   (LSB) 1.40 1.17 1.00 0.90 5.20 2.64
4000000 1.00 5.30 5.51   (LSB) 1.40 1.14 0.90 0.85 5.40 2.68
5332000 1.01 4.00 3.91   (LSB) 1.60 1.35 1.10 1.01 5.00 2.70
5405000 1.00 4.00 3.96   (LSB) 1.70 1.45 1.20 1.10 5.20 2.71
7001000 1.00 4.80 4.73   (LSB) 2.40 1.82 1.50 1.40 5.80 2.37
7300000 1.00 4.00 3.91   (LSB) 2.60 2.00 1.60 1.59 5.70 3.38
10100000 1.00 5.00 4.99   (USB) 2.80 2.39 2.60 2.30 3.70 2.50
10150000 1.00 4.60 4.50   (USB) 2.60 2.17 2.40 2.13 3.40 2.27
14000000 1.01 4.80 4.70   (USB) 1.50 1.23 1.30 1.21 3.30 1.88
14350000 1.01 4.40 4.32   (USB) 1.40 1.15 1.20 1.12 3.20 1.82
18068000 1.02 4.30 4.13   (USB) 2.40 1.83 1.90 1.83 4.00 2.45
18168000 1.02 4.40 4.18   (USB) 2.40 1.84 1.90 1.85 4.00 2.48
21000000 1.04 5.00 4.70   (USB) 1.40 1.21 1.40 1.20 2.60 1.49
21450000 1.05 6.00 5.85   (USB) 1.60 1.36 1.50 1.35 3.20 1.83
24890000 1.04 2.70 2.27   (USB) 1.00 0.77 0.90 0.74 2.00 1.14
24990000 1.04 2.70 2.28   (USB) 1.00 0.77 0.90 0.75 2.00 1.16
28000000 1.04 3.90 3.44   (USB) 1.30 0.97 1.10 0.97 2.60 1.35
29700000 1.03 2.70 2.22   (USB) 0.60 0.36 0.50 0.35 1.10 0.57

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