Search found 125 matches

by DanubeBCL
Sun May 28, 2017 9:24 am
Forum: SDR Antennas
Topic: Random wire questions
Replies: 10
Views: 922

Re: Random wire questions

As a LOG is easy to build I made some experiments the last days. The image shows a 4 x 5 m LOG and a 14 m wideband magnetic loop side by side on my Anan Angelia (portion of the 49 m band). Without a preamp the LOG is almost unusable. I added an old preamp with a PGA 103+ (which I had in my tinkerbox...
by DanubeBCL
Fri May 26, 2017 7:01 am
Forum: SDR Antennas
Topic: Great experience with PAR Electronics EF-SWL
Replies: 7
Views: 1120

Re: Great experience with PAR Electronics EF-SWL

Hi Andy, I am using two wideband magnetic loop antennas as well. One has 14 m circumference, the other one 5 m. The amplifiers are homebrew (LZ1AQ style, but not using AF transistors). In the beginning I also assumed that magnetic loops will pick up less noise than other types of antennas as many re...
by DanubeBCL
Thu May 25, 2017 4:43 pm
Forum: SDR Antennas
Topic: Great experience with PAR Electronics EF-SWL
Replies: 7
Views: 1120

Re: Great experience with PAR Electronics EF-SWL

Hi, as someone said: "Even a wet spagetti in the antenna socket is working from 0.01 Hz to 50 GHz. You just have to define what "working" is." Maybe for your purpose an EWE could be a choice. It does not necessarily take much room. It is directional and you might have to invest s...
by DanubeBCL
Wed May 24, 2017 2:38 pm
Forum: SDR Antennas
Topic: Great experience with PAR Electronics EF-SWL
Replies: 7
Views: 1120

Re: Great experience with PAR Electronics EF-SWL

LNRPrecision say it is a 1-30 MHz rx antenna. Anyone can post some performance figures of such antenna vs frequency range? I mean, this is a "short" wire (about 12 m), it performs the same at 10MHz and at 1MHz? I dont think so. I have some experience in DIY random wire antenna, and I know...
by DanubeBCL
Wed May 24, 2017 6:25 am
Forum: General
Topic: Proximity to computer
Replies: 2
Views: 180

Re: Proximity to computer

Computers in the vicinity of receivers always can cause trouble. Make sure that the antenna is as far away from the house as possible and insert a common mode choke directly at the antenna input of the receiver to block common mode noise induced into the coaxial cable by switching power supplies and...
by DanubeBCL
Fri May 19, 2017 7:20 am
Forum: SDR Antennas
Topic: RA0SMS Miniwhip bad performance on SDRPlay
Replies: 17
Views: 3802

Re: RA0SMS Miniwhip bad performance on SDRPlay

Sorry, but modifications of the bias T do not compensate the design of all the rest. Chris Trask (among others) has built several whip amplifiers and recommends (among other designs) an input stage which has an active current sink as a load resistor. ChrisTrask.jpg Source: Complementary Push-Pull Am...
by DanubeBCL
Thu May 18, 2017 8:31 am
Forum: General
Topic: ADS-B ob RSP 1?
Replies: 2
Views: 213

Re: ADS-B ob RSP 1?

Will I need a special antenna? A special antenna designed for the 1 GHz range is not a bad idea. Wideband antennas sometimes do not give strong enough signals in this frequency range. I used a simple homemade construction for my RTL dongle tests made of copper wire like this http://www.qsl.net/dl4m...
by DanubeBCL
Thu May 18, 2017 6:25 am
Forum: SDR Antennas
Topic: RA0SMS Miniwhip bad performance on SDRPlay
Replies: 17
Views: 3802

Re: RA0SMS Miniwhip bad performance on SDRPlay

It is not my intention to blame something or someone. But I would neither recommend to use dual gate Mosfet nor to apply extra amplification in an active whip antenna. I know that dual gate Mosfets were the absolute must in the 80s of the last century and were often used in RF amplifiers and active ...
by DanubeBCL
Mon May 01, 2017 4:41 pm
Forum: General
Topic: Will SDR Play work to do HF Aviation Scanning?
Replies: 4
Views: 521

Re: Will SDR Play work to do HF Aviation Scanning?

CSVUserlistBrowser app. Please mind that a list browser interfacing via a serial COM port cannot replace a communication scanner. It's just meant for a rudimentary overwiev of what is present on given channels (mainly broadcast stations). Moreover SDRuno does not report valid squelch levels by CAT,...
by DanubeBCL
Thu Apr 27, 2017 8:59 am
Forum: General
Topic: ZeusRadio may soon be compatile with SDRPLay
Replies: 30
Views: 9820

Re: ZeusRadio may soon be compatile with SDRPLay

After the ZS1 transceiver hadn't brought the expected success they guys tried to bring in some money by selling the ExtIO and HPSDR version of Zeusradio. First they distributed free test versions in various forums and collected user reports. Then all of a sudden the "final" version was no ...

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