Note
Ham Radio, Dec 1978, p. 93.
SL-65, 0–2000 watts.
SL-65A, 0–20 watts.
Provides instantaneous and continuous display of SWR and net power delivered to the load. There are no knobs or buttons, and no calibration required.
A two-digit display (0.33") shows SWR accuracy to 0.1 for values from 1.0 to 2.2. Accuracy is 0.2 for readings from 2.3 to 3.4, and 0.3 from 3.0 to 4.0. Will read to a maximum of 6.2.
For SWR values near 1.0, the power ranger for a valid reading is 20–2000 watts. For higher values the upper power limit for a jitter-free valid display is somewhat less, typically 35–1000 watts with an SWR at 2.0.
Divide the above values by 100 to obtain performace of the SL-65A QRP version.
The power displayed is the detected peak of the PEP for any modulation. Display decay update time is about one second. The unit will also display the power actually being accepted by the antenna (forward less reflected).
Power is displayed on the same two digits as the SWR in two autranged scales: 20–500 watts, and 500–2000 watts. So that a reading of 1.2 could mean either 120 watts or 1200 watts. You have to know which range you are working with.
Accuracy is 10 watts in the lower range and 100 watts in the upper range. (Again, divide by 100 for the SL-65A.)
The decimal point double as the pilot light.