UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Radio Wrangler · 9th May 2019, 2:49 pm

Odd, I've put signals over 40GHz up coax cables.
I've measured noise floors right down to the thermal floor at liquid nitrogen temperatures seen through coaxial structures.
I put 300 Watt pulses at a gigahertz with 50ns envelope rise times down coax cables.
I've measured ordinary pulses with 50picosecond rise times along coax cables.

Heck, I even have some in my hifi handling 20kHz audio.

I've never heard of electromagnetic polarisation distortion....

I did use smaller diameter cables above 22GHz to maintain TEM 01 mode. Could this be what he means? He must have very good hearing!

David

9th May 2019, 2:49 pm	#922
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,902	Re: The Audiophoolery Thread. Odd, I've put signals over 40GHz up coax cables. I've measured noise floors right down to the thermal floor at liquid nitrogen temperatures seen through coaxial structures. I put 300 Watt pulses at a gigahertz with 50ns envelope rise times down coax cables. I've measured ordinary pulses with 50picosecond rise times along coax cables. Heck, I even have some in my hifi handling 20kHz audio. I've never heard of electromagnetic polarisation distortion.... I did use smaller diameter cables above 22GHz to maintain TEM 01 mode. Could this be what he means? He must have very good hearing! David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done