is an asphalt ground plane reflector equivalent to a grassy field ground plane reflector?
I’ve been working on improving performance and portability of my V-dipole for NOAA weather satellite reception.
Previously, I had the antenna mounted to a PVC pipe stuck in the dirt in my backyard at the appropriate 0.44~ish meters.
Today, I tried it in the front street with a new free standing mount. Despite being at the appropriate height, SNR was terrible unless I physically touched the antenna rod connected to the center conductor. Also, there’s already a ferrite choke on the cable close to the antenna.
I’m trying to work out how much could be different between my front road and backyard. Is it possible that the layer of asphalt is not acting like an appropriate ground plane mirror? Should I create a physical ground plane? For the record, grass was wet and asphalt was dry.
I’ve ordered a cheap NanoVNR to investigate, but in the meantime, I thought I’d ask since I only get so many chances to test the antenna.
Using a Nooelec SmarTee and getting these periodic wide band dips in signal strength (blue bars). I assume it's something wrong with my SDR. Is that a power issue or something?
Detecting Meteors With SDR
https://hackaday.com/2023/06/18/detecting-meteors-with-sdr/
The simplest way to look for meteors is to go outside at night and look up — but it’s not terribly effective. Fortunately, there’s a better way: radio. With a software-defined rad…
Where should I start??
I've had a sdr sitting in my drawer for a few months now (was going to use it to sniff for weather stations near me to feed to my home assistant)
Didn't end up going in that direction, but I would like to play around with it!
Where are some good places to start, what are your use cases?
detecting pulsars with rtl-sdr
AmateurPulsarDetectionF.doc
https://docs.google.com/viewer?url=http://www.y1pwe.co.uk/RAProgs/AmateurPulsarDetectionF.doc
Reverse engineering a vintage wireless keypad with an RTL-SDR
Reverse engineering a vintage wireless keypad with an RTL-SDR
http://fatsquirrel.org/oldfartsalmanac/random/reverse-engineering-a-vintage-wireless-keypad-with-an-rtl-sdr/
A few weeks ago, some friends and I decided that our houses weren't crammed full enough with useless crap and so we embarked on a journey to a large junk shop s
Flipper Zero Self Destructs an Electricity Smart Meter
Flipper Zero Self Destructs an Electricity Smart Meter
https://www.rtl-sdr.com/flipper-zero-self-destructs-an-electricity-smart-meter/
Flipper Zero is an affordable handheld RF device for pentesters and hackers. It is not based on SDR technology, however it uses a CC1101 chip, a digitally controlled RX/TX radio that is capable of demodulating and modulating many common digital modulations such as OOK/ASK/FSK/GFSK/MSK at frequencies below 1 GHz. We've posted about the Flipper Zero a few times before on this blog, especially given that it is now a famously known device, having found popularity on TikTok and having been reviewed by famous Tech YouTubers like Linus Tech Tips. Recently a video on YouTube by Peter Fairlie has shown the destructive