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My MFJ 269 shows the SWR of a Tektronix 75 ohm termination as 1.0:1 up
to 77 MHz when Z0 is set to 75 ohms. Roy Lewallen, W7EL Steve Nosko wrote: Ian, and others, I have the 269 HF VHF UHF analyzer and noticed something strange. In the "non-50 ohm" Advanced menu 3 mode, with the Zo set to 75 ohms, an otherwise good 75 ohm load (please assume I know how to tell and I used a low frequency to reduce errors) shows something like a 1.3 : 1 SWR. When I called to ask about it, the first tech at MFJ seemed confused and clearly did not understand. Another call, on another day resulted in a better tech, but the response was to send it in for re-calibration. This also seems to be a calculation rather than an adjustment, no? Once you know Z it is a simple calculation to get to SWR for another Zo. Or have I been smoking a bad brand...? Woha! I see they have on line calibration manual for the 259B & 269 on line! http://www.mfjenterprises.com/MFJ-259Bcalibration.php http://www.mfjenterprises.com/man/pd...alibration.pdf I don't see anything other than "watch the blinking SWR" .(sounds like a British insult) for the Advance 3 "calibration". |
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