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Comment on Polls by Also Ben

Nevermind, needed a reload. Can someone come and remove this comment?

Comment on Polls by Ben

“Failed to verify Referrer” on poll completion
Is the website broken, or is there something wrong on my side?

Comment on Solving APRS Interference Issues with a Bandpass Filter and Coax Notches by Jose

It is an effective filter, very economical and practical, it can be made with any coaxial cable, rg58, 59, 6, 174, 213, etc.
It is cut at 1/2 electrical wavelength at the frequency you want to attenuate.
Example: to attenuate 97 MHz
1.- 300/97 = 3.09 Meters (1 wave)
2.- 3.09 / 2 = 1.54 (1/2 wave)
3.- 1.54X0.66 = 1.02 meters (multiply by the speed factor of the coaxial cable, in this case 0.66. See manufacturer’s data, since it may be of another value, 0.82, 0.85, etc.)
4.- Connect one end of the coaxial in “T” as shown in the image.
5.- The other end must be short-circuited, that is, join the mesh with the central conductor.
6.- Ready, enjoy a simple attenuator! (a 1 meter long coaxial cable with one end shorted)

Comment on OpenEar: An Easy to Use Windows TETRA Voice Decoder by Jan

Tetra decryption possible?

Comment on Characterizing Yagi Antenna Directionality via ADS-B Reception by Ladislav OK1UNL

OK, that is true, at original topic is a noticed coaxial cable RG-58. This one cable is not usefull for 1090MHz for his high attenuation. Exist much better low loss coaxial cables with impedance 50R originally made for WiFi nets.
Like H155 or RGC54 etc….. and prices are quite good.

Comment on Step-by-step Guide to Creating a GNU Radio Based QO-100 SSB Receiver by Omar kumar

Thanks for tutorial, amazing youtube channel

Comment on Characterizing Yagi Antenna Directionality via ADS-B Reception by Svend Skipper

The Yagi is the wrong way. The polarisation of ADS-B is vertical not horisontal.

Comment on Characterizing Yagi Antenna Directionality via ADS-B Reception by Ladislav OK1UNL

Yess, right position for mounting Yagi antenna is on balcony handrail

Comment on Characterizing Yagi Antenna Directionality via ADS-B Reception by dietrich

Nice idea!
But the measurement should be done in a more open space. The setup on the picture with balcony railing and the walls looks somehow useless for antenna measurements.

Comment on Radenso Theia: An SDR Based Police Radar Detector by delta7

Well first off your literally using the worst shitty radar detector on the market. Rocky Mountain Radar sucks in testing. If you really want to learn about this stuff drop over to Vortex Radar’s You Tube https://www.youtube.com/channel/UCgLr7xoTU3XgAeLrEYp51sw and join the RDF Forum https://www.rdforum.org/ and start you education.

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