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Author Topic: Yet Another Loop Post  (Read 1865 times)

Online jFarley

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Yet Another Loop Post
« on: August 23, 2014, 2141 UTC »
I have recently built a prototype of a resonant receiving loop which is exhibiting enhanced loaded Q.  That blog post is here:

http://hfunderground.com/blog/?p=395
Joe Farley, Near Chicago
SDR-IQ / R8 / R7
Remote Resonant Loops for HF and LF / ALA 1530
Active 60" Whip / PA0RDT
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Offline ChrisSmolinski

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Re: Yet Another Loop Post
« Reply #1 on: August 23, 2014, 2258 UTC »
Thanks for the great post on your new loop, I look forward to reading more down the road!
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
NRD 545 / netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 670 ft horizontal loop / 500 ft northeast beverage / 270 ft west-south-west beverage / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop

Online jFarley

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Re: Yet Another Loop Post
« Reply #2 on: August 23, 2014, 2311 UTC »
Thanks, Chris.  I look forward to seeing what it's going to do to Wolverine's wide audio.  I am pretty sure it's going have a noticeable effect on XFM. ;D

BTW, the tuning range appears to be 3210 - 10180
« Last Edit: August 23, 2014, 2313 UTC by jFarley »
Joe Farley, Near Chicago
SDR-IQ / R8 / R7
Remote Resonant Loops for HF and LF / ALA 1530
Active 60" Whip / PA0RDT
QSLS appreciated to:    jfarley44@att.net

Offline ka1iic

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Re: Yet Another Loop Post
« Reply #3 on: August 23, 2014, 2349 UTC »
Keep up the good work!  I was never able to get anything useful beyond 75 meters...  All I can say is be very careful of PVC as some of that material can cause problems in RF situations...  If it heats in a microwave oven then add that into your calculations...  but I am sure you have already consider this...

Keep on keeping one because you are doing better than I did...  ;D
73 Vince
KA1IIC

"If you can't be anything, you can at least be annoying"

Troy, Ohio. 20m Vertical & low long wire E/W, Yaesu FT-187ND, SDRplay 2, Ratt Shack 2 meter rig, and other little bits of electronics I'm not talking about, homebrewed and otherwise... so there bleech!

Offline Antennae

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Re: Yet Another Loop Post
« Reply #4 on: September 03, 2014, 1645 UTC »
Hey jFarley, congratulations on getting higher Q.  I'm not sure what that is but I figure I'll learn it some day.

I see you logged Wolverine after you posted this.  I'm curious to know how Wolverine fared on your new hot rod antenna.  From what I gather, your new antenna might cut off some of Wolverine's wide bandwidth. Please correct me if I'm wrong.
California Coast
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Antenna: usually a random wire with tuner

Online jFarley

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Re: Yet Another Loop Post
« Reply #5 on: September 04, 2014, 2037 UTC »
Thank you for your kind comments.  I am preparing a post for the 30 Below blog which covers the subject of Q, so stay tuned.

Yes, I logged WR with the new loop, and took a couple of screen shots.  With the Q levels I was experiencing that night, audio BW clipping was just incipient, but not pronounced; close, but no earth-shattering kaboom yet.  

Those caps are on my other computer, and I will post one later.



« Last Edit: September 04, 2014, 2058 UTC by jFarley »
Joe Farley, Near Chicago
SDR-IQ / R8 / R7
Remote Resonant Loops for HF and LF / ALA 1530
Active 60" Whip / PA0RDT
QSLS appreciated to:    jfarley44@att.net