Search found 207 matches
- Wed Jan 11, 2023 2:43 pm
- Forum: General Discussion
- Topic: The SULA antenna
- Replies: 37
- Views: 4137
Re: The SULA antenna
just a short note about how to route the coax feeding the SULA; the image below shows the effect of routing the coax outside the SULA or inside it (through the center), as you can easily see, routing the coax toward the center (second image from top) heavily changes the pattern, the backside "n...
- Sat Nov 12, 2022 7:56 am
- Forum: Questions & Advice
- Topic: Perhaps goofy antenna idea
- Replies: 37
- Views: 3170
Re: Perhaps goofy antenna idea
Jock, any update regarding outdoor antennas ?
- Wed Nov 09, 2022 8:07 pm
- Forum: Log Sharing & Broadcast Frequencies/Schedules
- Topic: Strange afternoon MW DX flare (5,500 and 7,500km!)
- Replies: 5
- Views: 629
Re: Strange afternoon MW DX flare (5,500 and 7,500km!)
I obviously like it to bits! :) No, seriously, it's not having any severe highpass/reduced sensitivity issues typical for ham transceivers on MW/LW and it has all the nice tools one would want in a MW DX radio (particularly passband tuning and notch filter), being an SDR and showing me faint carrie...
- Sat Oct 22, 2022 8:00 pm
- Forum: General Discussion
- Topic: The Belka (-DSP/-DX) appreciation thread
- Replies: 21
- Views: 3167
- Sun Oct 16, 2022 8:30 am
- Forum: General Discussion
- Topic: Another unidirectional small loop: the Coplanar Twin Loop
- Replies: 25
- Views: 1589
Re: Another unidirectional small loop: the Coplanar Twin Loop
as for the CTL, did you consider changing the size of the sides ? I mean, for example, making the vertical size 1/2 of the horizontal (or the other way around) while keeping the same total perimeter
- Sat Oct 15, 2022 7:16 pm
- Forum: General Discussion
- Topic: Another unidirectional small loop: the Coplanar Twin Loop
- Replies: 25
- Views: 1589
Re: Another unidirectional small loop: the Coplanar Twin Loop
Welcome to the forum, qrp-gaijin! Hope you guys tell me when it's time to charge my little dremel tool. :mrgreen: ~20dB more gain / less losses at little more than 1/2 the size of the SULA sounds pretty intriguing, even though the overall coverage seems to be pretty small (7-21Mhz?). ...check if it...
- Sat Oct 15, 2022 4:00 pm
- Forum: General Discussion
- Topic: Another unidirectional small loop: the Coplanar Twin Loop
- Replies: 25
- Views: 1589
Re: Another unidirectional small loop: the Coplanar Twin Loop
forgot (and OT) do you know what happened to Jim's ham forum (the radio board) ? I know you were a member there, and there were a lot of cool folks, but then, it went suddenly "poof" <sigh>
- Sat Oct 15, 2022 10:28 am
- Forum: General Discussion
- Topic: Another unidirectional small loop: the Coplanar Twin Loop
- Replies: 25
- Views: 1589
Re: Another unidirectional small loop: the Coplanar Twin Loop
first of all, at the moment I'm busy helping some relatives picking olives from trees, so please forgive me if I delay my replies; also, as you can guess. I've no way to run NEC simulations here :D (note: did you know that ezNEC is now free ? https://www.eznec.com/ ) ... anyhow, your simulations are...
- Fri Oct 14, 2022 5:08 pm
- Forum: General Discussion
- Topic: Another unidirectional small loop: the Coplanar Twin Loop
- Replies: 25
- Views: 1589
Re: Another unidirectional small loop: the Coplanar Twin Loop
forgot, (yes, still ferreting around <sigh>); try the following: load the CTL model, remove the cap/resistor from the outer loop and replace the cap in the inner loop with a resistor (530 Ohms like the SULA will do), now run the NEC model, done so, change the inner loop size and check the result, do...
- Fri Oct 14, 2022 4:49 pm
- Forum: General Discussion
- Topic: Another unidirectional small loop: the Coplanar Twin Loop
- Replies: 25
- Views: 1589
Re: Another unidirectional small loop: the Coplanar Twin Loop
I'm in a hurry, so I'll keep this short; first, that loop and dipoles setup somewhat recalls at large a yagi (dipoles), did you try changing the size/spacing of the dipoles ? Then, about the CTL, I started wondering if it may be used as a TX antenna, in such a case it would be interesting for lower ...