k2mm
Member
I have a 30m EFHW resonant sloper antenna. I've completed tuning it using my RigExpert and have an excellent SWR at the antenna and the TXRX. I know that some common mode currents are present, so I have a CMC filter at the antenna and in the shack. I've attached an image showing the antenna system and antenna analysis at five locations.
I have two quick questions:
1) After the signal passes through the shack's CMC filter at the end of a 50' run of LMR400, should the signal's phase be around +/-90 degrees if the SWR is good/similar to the antenna's feed point? I don't think they can be compared because common mode current could still exist in the shack despite using filters and grounding.
2) Do the measurements I took of the antenna system indicate any problems? I was concerned about the RL being more than 20, but from what I've read, larger values are better and track with the value of SWR. I am looking for a sanity check and have included the measurements, below.
Thank you for your time and interest in my question.
ANTENNA SYSTEM
ANTENNA SYSTEM MEASUREMENTS
I have two quick questions:
1) After the signal passes through the shack's CMC filter at the end of a 50' run of LMR400, should the signal's phase be around +/-90 degrees if the SWR is good/similar to the antenna's feed point? I don't think they can be compared because common mode current could still exist in the shack despite using filters and grounding.
2) Do the measurements I took of the antenna system indicate any problems? I was concerned about the RL being more than 20, but from what I've read, larger values are better and track with the value of SWR. I am looking for a sanity check and have included the measurements, below.
Thank you for your time and interest in my question.
ANTENNA SYSTEM
ANTENNA SYSTEM MEASUREMENTS
