Search found 157 matches

by vk7jj
Mon Jun 24, 2019 12:38 am
Forum: New Users' experiences
Topic: Best antenna no good signals?
Replies: 11
Views: 1091

Re: Best antenna no good signals?

A rural location? Great to use larger simple wire antennae and really benefit from your likely lower noise level. Given your original question went to the point of precise antenna geometry, my own approach is based on "perfect is the enemy of good", attributed to Voltaire among others thou...
by vk7jj
Sun Jun 23, 2019 9:13 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 79
Views: 6950

Re: Receive Antenna & Impedance "Matching"

It is a nice weekend thank you, trust yours has been too. White frost in the mornings with perfectly still sunny days and the brightest blue sky. Happy solstice :-) Your double spacing lesson was not lost Gianfranco, I need to firm on a few other things first. I'd also like to try to do away with PV...
by vk7jj
Sat Jun 22, 2019 8:43 am
Forum: New Users' experiences
Topic: Best antenna no good signals?
Replies: 11
Views: 1091

Re: Best antenna no good signals?

Hi Paul and hi Bas. Apologies to you both as I didn't see the reply and question. Paul, the triangle shape is very forgiving, building your triangle for the largest enclosed space is the best way to think about it but you would have to do horrible things to it to make much noticeable difference. If ...
by vk7jj
Sat Jun 22, 2019 7:52 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 79
Views: 6950

Re: Receive Antenna & Impedance "Matching"

Wow indeed, you got that right Paul! Nicely wound Gianfranco, a very clever coil it is ... instead of you feeding it, it feeds you :-) A very pleasant scene indeed, good on you for posting it. There is no way I can compete! -- Here is my version 3, working really nicely. 7.0386 is the 40m WSPR frequ...
by vk7jj
Fri Jun 21, 2019 7:43 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 79
Views: 6950

Re: Receive Antenna & Impedance "Matching"

Version 2 works well, as you can see with beehive trimmers. They used to be so common, looking on eBay it seems they're made of unobtainium. Yesterday's reference to eBay was in regard to some pistons priced at over $400 each. Testing version 2 for insertion loss was easy using WSPR. Looking at some...
by vk7jj
Thu Jun 20, 2019 8:40 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 79
Views: 6950

Re: Receive Antenna & Impedance "Matching"

Hello again Gianfranco! Agreed wholeheartedly about spending on computer hardware I can't justify it for a hobby, you were most fortunate with your purchase. I'll muddle through until I find something though I'll have to find another rig from the "not so old" collection to do 30m to free u...
by vk7jj
Wed Jun 19, 2019 7:51 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 79
Views: 6950

Re: Receive Antenna & Impedance "Matching"

Thank you Gianfranco for everything, I'm frustrated I can't test things for myself with the lack of computer so I've rather pushed you. I went to buy a new Windows laptop yesterday at the June stocktake sales and ogled a vast smorgasbord of the latest shiny offerings and walked away empty handed. Co...
by vk7jj
Tue Jun 18, 2019 7:52 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 79
Views: 6950

Re: Receive Antenna & Impedance "Matching"

Hi Gianfranco, Yes, there are so many varying needs and varying antennas, looking through these threads, which shows an active and healthy community, which is great! One of the things you have done that plays (pun intended) so well into the above situation was to demonstrate the sliding coupling. By...
by vk7jj
Mon Jun 17, 2019 10:19 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 79
Views: 6950

Re: Receive Antenna & Impedance "Matching"

Hi Gianfranco, sounds like the Pandora box of filters is open! My own needs are well satisfied with a sharper filter despite it's loss. One of the reasons for that is the difference in our antennas and another is the difference in what we each are trying to listen to. Your antenna is directional and...
by vk7jj
Mon Jun 17, 2019 4:18 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 79
Views: 6950

Re: Receive Antenna & Impedance "Matching"

Hi Gianfranco. Have you given any thought to how SDRuno's calculation of SNR might be influenced by a narrow preselector? If SDRuno calculates SNR as a ratio of wanted signal to passband power, if the SNR algorithm relies on samples or averages of spectrum power in the current bandwidth and assumes ...

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