|Oliver was going to watch over the operation|
Each year around this time I bring the MFJ 1788 Mag loop in to take the covers off and have a look around to see how it has faired over the past year. This antenna has been great for me with my very restricted condo situation. I have been able to get all around the world on CW with most of the time 5 watts QRP. I am about 60 feet in the air, it's on the balcony and we do have other condo's all around us but having said that I have been very pleased with the performance of the loop. At first tuning the
loop took some time but now I really have the hang of things and am able to tune it in no time. Most of the time the SWR is flat or very close to flat on all bands it's designed for. Now as for band width on 15m it's very nice but as you move closer to 40m it gets very narrow but it is what it is. When reading the reviews of this antenna on Eham many have mentioned how the antenna when new from MFJ had an issue or two. My antenna also out of the box had an issue with the tuning box with a switch that had to be replaced. I purchased the antenna through DX engineering and they were very fast to have MFJ send me a replacement switch.
Now back to my yearly maintenance, the antenna is covered with a patio table cover to help it look like balcony furniture and funny thing is it does not affect the SWR at all so the cover is kept on all the time. This year I picked up a new cover as the old one was 4 years old no longer water proof and showing it's age. I removed the plastic covers and cleaned the inside out which were really not all that dirty. I found as I do each year some loose nuts and bolts that require
|Keep track of parts |
snugging up but this year I noticed one of the nut/bolt combination seemed to have some burning on it. This was one of two nut/ bolts that help secure the loop to the tuning cap. All other nut/bolt combinations were fine it was just this one that I ended up replacing with close substitution from my nut/bolt collection. I have posted a picture of the nut/bolt that was removed, any suggestions as to what may had happened? The nut/bolt was not at all loose and it was only this nut/bolt that had an issue. One other thing I like to do is run the tuning cap full turn in both directions looking for smooth operation, spacing moving fins against the stationary fins and the function of the micro switches that stop the tuning cap at the end of each end. Overall the antenna was in great shape and just to make sure once it was all back together and covered with new cover I tuned it through each band to make double sure all was well.
|New cover and ready to go|
|Nut/bolt that was replaced|
|New nut/bolt installed|
|Checking fin alignment |