Search found 147 matches

by snn47
Sun Jan 20, 2019 6:41 pm
Forum: Antennas
Topic: LNA for stock antennas
Replies: 5
Views: 16914

Re: LNA for stock antennas

The disadvantage of having a very broadband antenna with preamplifier is that without filter/frequency selective antenna the receiver and or the preamplifier in the antenna may be overloaded. This means the active components cannot process all signals with the same factor, e.g. weak and stong signal...
by snn47
Sun Jan 20, 2019 6:38 pm
Forum: Antennas
Topic: Masthead amplifier (TV) with SDR dongle
Replies: 2
Views: 12892

Re: Masthead amplifier (TV) with SDR dongle

The disadvantage of having a very broadband antenna with preamplifier is that without filter/frequency selective antenna the receiver and or the preamplifier in the antenna may be overloaded. This means the active components cannot process all signals with the same factor, e.g. weak and stong signal...
by snn47
Sun Jan 20, 2019 6:48 am
Forum: Antennas
Topic: Recommended outdoor antenna for SDR?
Replies: 2
Views: 13070

Re: Recommended outdoor antenna for SDR?

There are active antennas that provide the frequency range you want, e.g. like the R&S®HE700 with the Rod antenna but than the price is also quite high, since with the other antenna elements it works up to 18 GHz (thats 18 000 MHz). Models Frequency range R&S®HE700 10 kHz to 18 GHz R&S®HE700 Rod ant...
by snn47
Sun Jan 20, 2019 4:24 am
Forum: RTL-SDR Discussion
Topic: OTA TV
Replies: 8
Views: 14345

SW Definitions

Shortwave definitions vary slightly between ITU regions between 1.6 to 1.8 MHz up to 30 MHz see https://en.wikipedia.org/wiki/Shortwave_radio While TV channel 1 existed in the beginning, most TV Turner in the past 50 years tuned only between channel 2 to 13, and did not provide means for tuning to c...
by snn47
Fri Jan 18, 2019 4:56 am
Forum: Antennas
Topic: Best antenna for 1mhz-50 and 1khz - 800khz
Replies: 5
Views: 14434

Re: Best antenna for 1mhz-50 and 1khz - 800khz

You might try an active antenna the cheapest form is a short whip with an associated pre-amplifier For starter from an old active car antenna could do, since it had to work for AM and FM. or you might just put 5 or more meter of wire up. For receive you can get away with a lot and still receive sign...
by snn47
Fri Jan 18, 2019 4:11 am
Forum: RTL-SDR Discussion
Topic: OTA TV
Replies: 8
Views: 14345

analogue TV

I just remember as a kid being able to listen to broadcast TV on the old shortwave radios. shortwave receiver by definition receive at max. 30 MHz and not higher while TV-channel 2 or higher channel started in the VHF low band (Band I) between 54 and 88 MHz, so I wonder how you could receive audio ...
by snn47
Fri Jan 18, 2019 3:39 am
Forum: RTL-SDR Discussion
Topic: weak reception in ADS-B using upconverter
Replies: 6
Views: 13161

Re: weak reception in ADS-B using upconverter

the dongle picks several GSM frequencies , and the upconverter using same antenna, only picks one frequency. Another possibility is that the receiver is not within it's dynamic range where it is able to process strong signals any more, thus creating additional intermodulation (IM) products. If you ...
by snn47
Sun Dec 30, 2018 1:46 pm
Forum: RTL-SDR Discussion
Topic: RTL-SDR V3 long wire problems (SOLVED)
Replies: 12
Views: 5377

Re: RTL-SDR V3 long wire problems (SOLVED)

pretty sure the ESD diode on that balun is a proper protection diode, BUT an antenna input protection diode isn't going to do much if the system isn't Looking at the picture from the NooElec Balun One Nine - Tiny Low-Cost 1:9 https://images-na.ssl-images-amazon.com/images/I/81O4qjAtKLL._SL1500_.jpg...
by snn47
Sun Dec 30, 2018 9:42 am
Forum: RTL-SDR Discussion
Topic: RTL-SDR V3 long wire problems (SOLVED)
Replies: 12
Views: 5377

long wire problems

RCND and all It is interesting to note that the NooEelec 1:9 Balun claims to be with Antenna Input Protection, which if true should have protected your dongle. Does anyone have a scrematic or type list of the protection components used? From the picture on amazon I asume that they just used a resist...
by snn47
Sat Dec 29, 2018 7:11 pm
Forum: RTL-SDR Discussion
Topic: attenuaters
Replies: 1
Views: 1160

required power rating and attenuation of attenuaters

The answer will depend on a lot of if/then, depending on your receiver and how you want to couple the receiver to the transmitter output, e.g. direct connection via attenuators, via a directional coupler or over the air? The required attenuation depends on the max. allowable power that the receiver ...