Search found 203 matches
- Thu May 25, 2017 4:43 pm
- Forum: SDR Antennas
- Topic: Great experience with PAR Electronics EF-SWL
- Replies: 23
- Views: 89508
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 some additional circu...
- Wed May 24, 2017 2:38 pm
- Forum: SDR Antennas
- Topic: Great experience with PAR Electronics EF-SWL
- Replies: 23
- Views: 89508
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 every pie...
- Wed May 24, 2017 6:25 am
- Forum: General
- Topic: Proximity to computer
- Replies: 2
- Views: 10030
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...
- Fri May 19, 2017 7:20 am
- Forum: SDR Antennas
- Topic: RA0SMS Miniwhip bad performance on SDRPlay
- Replies: 36
- Views: 141793
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...
- Thu May 18, 2017 8:31 am
- Forum: General
- Topic: ADS-B ob RSP 1?
- Replies: 2
- Views: 9797
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...
- Thu May 18, 2017 6:25 am
- Forum: SDR Antennas
- Topic: RA0SMS Miniwhip bad performance on SDRPlay
- Replies: 36
- Views: 141793
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 ...
- Mon May 01, 2017 4:41 pm
- Forum: General
- Topic: Will SDR Play work to do HF Aviation Scanning?
- Replies: 6
- Views: 21200
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,...
- Thu Apr 27, 2017 8:59 am
- Forum: General
- Topic: ZeusRadio may soon be compatile with SDRPLay
- Replies: 30
- Views: 94862
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 longer fre...
- Sat Apr 15, 2017 6:25 am
- Forum: SDRuno
- Topic: New user question - please see my screenshot
- Replies: 9
- Views: 22177
Re: New user question - please see my screenshot
the longwire comes directly into the shack and the SDR. This is no good arrangement. Keep everything which acts like an antenna as far away as possible from your house (and neighbouring houses), match the antenna to 50 Ohms at its best and use coaxial cables to bring the signals into the house. Pla...
- Fri Apr 14, 2017 9:14 am
- Forum: SDR Antennas
- Topic: pwr supply for miniwhtp
- Replies: 3
- Views: 14935
Re: pwr supply for miniwhtp
Hello, I do not know which electronic shops in the States still have analogue PS in their portfolio. I have searched a bit in ebay.com, but the result was a desaster: All wallmart PS I found were switched. Some hamradio shops still have 12/13.8 V PS at higher amperage which are analogue. But they ar...