I calibrated at the S1 port directly. Then I connected S1 to the feed line and subsequently
the antenna. The plane I measured would be where the feed line attaches to the radio.
** Yes, I understood what you did.
It is not a mistake. You measure the impedance of your antenna, brought back by your cable. It is the impedance that your TX sees in transmission.
Where it is a mistake is the deduction of saying that the antenna is too long. You could, through software like SimNEC, find (see) the calculated impedance of the other end of the cable (antenna side). But:
- You have to know how to use SimNEC which is not obvious
- Know what you are doing
- Assume that the cable is the one you are using
- Know the exact length of the cable
Add a length of cable (Tx side) and you will see that the impedance brought back changes
--
F1AMM
Fran?ois
-----Message d'origine-----
De la part de David Gerhart
Envoy¨¦ : mercredi 15 janvier 2025 07:12
