On Sunday before I fired up the K3 on 30 meters to try the new attic dipole on the air with WSPR. I double checked the SWR with my MFJ analyzer and it was 1.4 . I was very surprised to see the SWR went from the 1.4 yesterday to 2.4 when I tried to transmit with my K3!!!! I went up to the attic (AGAIN) to have a look at the antenna just to make sure something did not happen over night. It looked very good so I then I hooked up the antenna analyzer to the antenna and low and behold the SWR was now 2.4. I checked the coax with an ohm meter and all was good. I then removed the balun out of the picture and it was still 2.4 SWR. I then ran a short piece of
Murphy was discovered on the moon!!
coax from the antenna to my antenna analyzer and the SWR was still 2.4. I then checked the antenna connections at the mounting bracket and it was ok......the only thing I can try now it to adjust the height of the antenna in the attic maybe move it further away from some of the joist's. I was left scratching my head wondering why the SWR was good until I sent 3 watts into the antenna??? Then after that the SWR never again was 1.4 but 2.4, the 40 meter antenna was never affected by the attic joist's and the 20 meter dipole is about 4 inches away from the wooden roof in the attic. I guess if I was to look close there would be a post-it-note from Murphy's desk with a smiley face on it....I then made an adjustment to the antenna by lowering it's height just a little. On the MFJ analyzer that seem to do the trick again and the SWR was back down to around 1.4. Now it was time to put some power through the antenna and see if the SWR stayed the same or changed again. This time it did go up but only to 1.6 this is very odd as I have not had this happen before with any of my antennas. Here is the next odd happening....I went on 30 meters WSPR and was not able to decode any signals and I was not being received by any other stations. My LP-100 did show I was putting out 1 watts to which I raised to as high as 5 and still nothing. I did switch over to 20 and 40 meter WSPR and all was ok seems I have to do more investigating with 30 meters. Finally the other odd thing is the SWR will at times be 1.4 and will rise to 1.6 at times and stay there. Also as I adjust the sound card to the proper ALC reading I am not able to get the RF output to raise and lower when I adjust the RF on the K3. But on 20 and 40 meters all is ok. hmmmmm