On Sun, 4 Aug 2019 at 08:46, tuckvk3cca <tuckvk3cca@...> wrote:
Thanks Gary. I contacted my supplier, EBay and ask if I could get another
set of cal8bration loads. No luck. The 50 ohm was of very high quality,
return loss -70dB compared to -40dB from another source I had, up to 1GHz.
Anyone knows where to get such loads? Sent from my Samsung Galaxy
smartphone.
Return loss of loads should not stated as a *positive* number as it¡¯s a
loss. A return loss with a negative number could only be obtained from a
negative resistance, such as a Gunn diode amplifier.
A return loss of 70 dB can only found in fairyland! I measured 44 dB, but
stated that the measurement would be subject to large errors as the return
loss of the loads in my 85052B calibration kit were specified as 48 dB.
Really, 70 dB can only be found in fairyland. Another VNA might indicate 70
dB, but the result is meaningless.
Dave G8WRB
--
Dr. David Kirkby,
