Jun 192018
 

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

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.

 

2E0SSM Working on the Mast

2E0SSM Working on the Mast

 

 

 

 

 

 

2E0SSM Working on the Mast

 

 

 

 

 

 

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.

 

Corroded Coax Corroded Coax Corroded Center Pin

 

 

 

 

 

 

 

 

 

 

 

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 didn’t 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.

Feb 172018
 

On Thursday 15th February 2018, club members Roger (G3PVU), Les (G1LQB), Steve (M5ZZZ), Alistair (M0TEF) and Peter (2E0FGA) installed the Hy-Gain TH-5, 5 element, 3 band (10m, 15m and 20m) beam antenna at the Lincoln Shortwave Club site. Pam (G4STO) kindly prepared lunch for the team.

Alistair (M0TEF) reported performance was good with some big signals coming in from the states.

An added bonus was an air display from the Red Arrows, who are based at RAF Scampton. Find out more about the Red arrows here.

G5FZ Hy-Gain TH-5 Antenna

G5FZ Hy-Gain TH-5 Antenna

 

Jan 272017
 

Home Brew Magnetic LoopOn Wednesday 25th Jan Ian G4XFC gave a very informative talk on the Magnetic Loop aerial explaining the principles of the loop and showing that they were not as difficult to make as often perceived. The talk mainly concentrated on making a QRP portable loop that can be assembled and operated in less than 5 minutes.

Tuning Capacitor Box for a 5 foot Magnetic Loop
The talk has motivated some of the members to have a go making a portable loop for themselves, which was the main purpose of Ian’s talk. Because of this Ian has decided to have a Magnetic Loop workshop on Saturday the 18th of February at the club shack.

Photos courtesy of Pam G4STO

 Posted by at 4:39 pm
Mar 152013
 

Atlanta Radio Club hosted an evening with Martin F. Jue and have posted a series of videos on You Tube where Martin gives a series of demonstration on how you can use MFJ’s Antenna Analysers. Well worth watching for those who like to play about with antennas and a list of the 20 videos can be found here.  More video’s of the MFJ Antenna Analyser can be found here

Thanks to Des G4UHZ for pointing me in the direction of these links.