Search found 9 matches

by rayb
Sun Jun 04, 2023 5:53 pm
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

Got it Andrew. I've decided to keep both 9:1 baluns and do a little experimenting with them from low to high HF. I know I'll need to get a rotor to take full advantage of the Sula. I thank you for your help, as well as 13dka's. This'll wrap up my posts on the Sula.

73,
rayb
by rayb
Sun Jun 04, 2023 1:13 am
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

Not sure Andrew if the noise is different sources, just no way to know. Whatever the source, I'll need a rotor if I intend on making the Sula practical for me. I now have a preamp attached. If you feel the 43 is a better choice over the 73 for hf, I'll have to go with increasing the coax side number...
by rayb
Sat Jun 03, 2023 1:27 am
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

So the resistor changeout to approx. 640 ohms worked. The antenna seems to be doing a good job. I re-adjusted the coax run from the balun, as per your instructions. I found I needed to replace my 9:1 balun. The balun I had was a binocular with a 43 mix. With two turns to the coax, there really wasn'...
by rayb
Thu Jun 01, 2023 7:41 pm
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

Thanks for taking the time to model this configuration Andrew. I did notice yesterday after a few actual field tests, that the resulting pattern seemed to have a null that wasn't all that deep. The noise level didn't decrease much at the null. Perhaps your results from the modeling are pointing this...
by rayb
Thu Jun 01, 2023 12:26 am
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

Hi 13dka... Thanks for your reply. 1. Yes, it is supported by a wood pole. Sorry I didn't supply a better photo. 2. Ok on the Sula needing the amp at the source. I'll try it. My thoughts were that as the frequency was lowered, the coax loss to the shack would be less, so as to make up for the decrea...
by rayb
Wed May 31, 2023 7:42 pm
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

Well, I finished construction on my Sula, and have it temporarily lashed to a metal fencepost on the lawn. I say temporary because it would never stay vertical with the very high winds that often blow through this rural location. It's just for testing... seeing how it works on the different bands be...
by rayb
Tue Feb 28, 2023 9:02 pm
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

I just might try it in a few weeks since better weather isn't too far away. Good tip about making sure the test is on more than one band. I wouldn't think it would be of much use at LF, but MF through 30 mhz would definitely be in order. I have better antennas for vhf and higher.

rayb
by rayb
Tue Feb 28, 2023 5:29 pm
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

Very good Andrew. Well, it was just an idea I had that seemed to have a possiblility of working. That's how we advance the state of the art... come up with an idea and test it. Thanks for your reply. Your work saves someone from spending time and physical effort that won't produce the desired result...
by rayb
Tue Feb 28, 2023 4:10 pm
Forum: General Discussion
Topic: The SULA antenna
Replies: 63
Views: 136939

Re: The SULA antenna

Hello, I just found this forum, as well as the info on the Sula antenna. Looking over the four pages of info on this post, it seems to be a very good "all around" antenna for swl'ing, as well as it having the benefit of only one null instead of the usual loop dual null. Ok, I'm going to be...