Search found 9 matches

by Nulluser00
Sat Jun 01, 2019 12:22 pm
Forum: General
Topic: Parting thoughts
Replies: 18
Views: 3410

Parting thoughts

In: https://www.sdrplay.com/community/viewtopic.php?f=5&t=4502 I started a thread: Someone wrote: I have a 50 ohm BNC coax connector on about 75 feet of RG6 75 ohm coax. "sdrom33" very thoughtfully responded with: "Hi Noel, I hope you will forgive me if i tell you that your posts are too long. You a...
by Nulluser00
Tue Mar 26, 2019 2:04 pm
Forum: General
Topic: Galvanic Antenna Isolators
Replies: 1
Views: 1353

Re: Galvanic Antenna Isolators

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by Nulluser00
Thu Aug 09, 2018 12:10 pm
Forum: General
Topic: Is this a worthwhile addition
Replies: 3
Views: 1839

Re: Is this a worthwhile addition

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by Nulluser00
Thu Aug 02, 2018 9:09 pm
Forum: General
Topic: Low noise antenna feedline
Replies: 1
Views: 1341

Low noise antenna feedline

In post: https://www.sdrplay.com/community/viewtopic.php?f=5&t=3521 'glovisol' brought up a very important point. "This article is representative of what could and should be done with a conventional receiver with umbalanced 50 Ohm input. But with this scheme the risk of the in between coax line beco...
by Nulluser00
Wed Aug 01, 2018 12:32 pm
Forum: General
Topic: Using a SDR in a remote cabin
Replies: 2
Views: 2090

Using a SDR in a remote cabin

With modern design and components it is easy to make radios that are external noise limited for ELF-VLF-LF-MF-HF. By " external noise limited" I mean the normal ambient RF noise floor [or level] is high enough to make low noise design overkill. For some applications, beginning at 20MHz internal nois...
by Nulluser00
Sat Jul 28, 2018 7:13 pm
Forum: General
Topic: Some more receive only transformer info
Replies: 1
Views: 1996

Some more receive only transformer info

I really enjoyed the series of posts by "glovisol" and after reading all the thread I was motivated to do some further research. These two articles went into a bit more theory and offered some additional food for thought. "Impedance Matching Transformers for Receiving Antennas at Medium and Lower Sh...