[LSWC] More Antenna Work
 

Lincoln Short Wave Club

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More Antenna Work

Posted: 19 Jun 2018 03:03 AM PDT
http://www.g5fz.co.uk/antenna-work/


Lincoln Short Wave Club - Bringing amateur radio to the community

This weekend members undertook more work on the clubs antennas. After the
work done previously installing the HB9CV, when the mast was put back up it
was found to have a high SWR. The coax used was an existing run that was
previously used for 23cm which was taken down that same day with suspected
antenna problems. With this coax now being used to feed the HB9CV which was
also showing a high SWR the coax was now also suspected as faulty.


This Weekends Antenna Work

Stephen (2E0SSM), Les G1LQB, Peter (2E0FGA), Roger (G3PVU) & Steve (M5ZZZ)
arrived on site Saturday morning and soon had the mast lowered.
Antenna Mast Lowered















With the mast now down again a new run of coax was installed and connected
to the HB9CV. The spacing between each of the antennas was also improved.

































With this done it was decided to remove the connector from the end of the
suspected 23cm coax to check for water ingress. What was found was as
predicted, water had got into the coax and had started to corrode the
braid, center core and the pin of the N-type connector.



























About 2ft was cut off the end to try and find some good coax. A new
connector was fitted, The 23cm antenna refitted with a second hand dipole
and the mast was lifted back up. Both the antennas were tested, the HB9CV
worked perfectly and its front to back performance demonstrated with an S9
signal completely gone when turned even 90 degrees away. The 23cm
unfortunately still didnt work and so further investigation is required.
Next plan it to test the full length of coax with a dummy load to see if it
all needs to be replaced.

Lincoln Short Wave Club - Bringing amateur radio to the community