Search found 206 matches

by vk7jj
Sun Jun 16, 2019 5:57 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

Your test pic is looking really good, brilliant in fact! That bandwidth and slope would likely make a lot of difference for many listeners plagued with strong unwanted signals. Dancing is great, we've been members of a local rock n roll dance club for some years. If you want a look at the scope of W...
by vk7jj
Sat Jun 15, 2019 12:27 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

Hello again Gianfranco. Splendid to hear of your cherry year, it stands in stark contrast to our gardens here white with frost with the winter solstice only a handful of days away. Yesterday we celebrated my wife's birthday and being rock and roll addicts danced until early this morning. Not so good...
by vk7jj
Fri Jun 14, 2019 7:33 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

Hi Paul, glad to know of your interest, I'm sure Gianfranco will comment too. Winding coils and playing with things as per Gianfranco's screen shots is physically easy once you get started, it's just a matter of making that start One of the things that used to hold me back in the years BC (Before Co...
by vk7jj
Fri Jun 14, 2019 1:02 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

What a great effort Gianfranco, not just your construction and measurements but also your presentation, you do it very well indeed! Re. PCs, working with really old gear is fun until it isn't. :-) I'm relieved and really pleased you were able to establish for yourself the worth of the project. Thank...
by vk7jj
Thu Jun 13, 2019 9:00 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

Well done Gianfranco! Isn't that good, I can see where you are heading with the Duo, the Duo is really well suited to the idea you first mentioned you were working on. You've had quite a few hours now since you got this setup going, I wonder if you've found it as useful as you hoped as the propagati...
by vk7jj
Wed Jun 12, 2019 12:59 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

Hi Gianfranco, thank you so much for going to the trouble of doing the 27mm enlargement, that was appreciated. Great to have direct instrumental reading of Q, I wonder that you have such a device! The loaded Q is something I'm going to have to live with or not on a real time trial basis and the inse...
by vk7jj
Tue Jun 11, 2019 7:22 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

That would be splendid, thank you! It's annoying not being able to readily use the Windows box, hence the photo of the antenna analyser instead of antscope. Exactly as per my original post, the 40m version as below. The PVC is a standard size that I had lying round here and the coil length is accura...
by vk7jj
Tue Jun 11, 2019 5:37 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

Hello again, been winter pruning fruit trees all day. Just wound a second tank the same as the first, the plan being to use the 50 ohm loops as "in one end and of the twin section out the other" but have only started experimenting with inter-tank coupling. Part of my problem is the only Windows box ...
by vk7jj
Mon Jun 10, 2019 11:33 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 65152

Re: Receive Antenna & Impedance "Matching"

Cheap wire delta loop antennas work, along with roughed up preselectors and an RSP2, how is this for an Rx effort... I modded a test version of my WSPR website to track ham balloons. The power out of the balloon Tx is 10mW on the 30m ham band. As you can see every point on the map was a transmission...
by vk7jj
Mon Jun 10, 2019 3:51 am
Forum: SDR Antennas
Topic: New Sdrplay and antenna creation
Replies: 21
Views: 19894

Re: New Sdrplay and antenna creation

Thanks for the memories! We had one of these instead, brilliant machines they were https://tinyurl.com/y3wq9q9w