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Re: [IRCA] [ABDX] Western Superloop--Initial Trials

Les,

You make no mention of a feed point transformer, I trust you are using one? You're also using 75 ohm coax rather than 50 ohm?!

I would very highly recommend http://www.loop-antennas.com/Components/FLG100LN-2 which not only adds useful amplification which you will want for the low end, but serves as a feed point transformer as well.

73 KAZ

-----Original Message-----
>From: "Les Rayburn les@xxxxxxxxxxxxxxxx [ABDX]" <ABDX@xxxxxxxxxxxxxxx>
>Sent: Jul 2, 2015 12:51 AM
>To: "am@xxxxxxxxxxx" <am@xxxxxxxxxxx>, "irca@xxxxxxxxxxxxxxxx" <irca@xxxxxxxxxxxxxxxx>, "abdx@xxxxxxxxxxxxxxx" <abdx@xxxxxxxxxxxxxxx>
>Subject: [ABDX] Western Superloop--Initial Trials
>
>Finally found time to erect a Western facing Superloop. It's 24 X 7'. 
>I'm using a fixed 900 ohm termination, and feeding it with quad-shield 
>RG-6 coax. I installed three snap-on ferrite cores near on the feedline 
>near the antenna, and then again at about 40 feet down the coax, three 
>more just before it enters the shack. Total coax run is about 90 feet.
>
>The antenna is quiet, very quiet--but signals levels are too low. I plan 
>to add a DX Engineering Receive Preamplifier DXE-RPA-1 when my budget 
>will allow. I'm going to send 12 VDC down the cable, and mount the 
>pre-amp in a weatherprooof box near the antenna.
>
>http://www.dxengineering.com/parts/dxe-rpa-1
>
>In terms of performance, I'm not sure what to expect. I tried a few 
>stations that were due East of me, such as WSB 750 in Atlanta. It was 
>weaker than on my other antennas, but not remarkably so. Listened for a 
>few of the Western powerhouse like KOA 850 in Denver, but nothing heard. 
>Not surprising, since KOA only appears a few times each winter.
>
>I have a variable resistance unit as well that I can substitute for the 
>fixed termination. It's range is 900 to 1400 ohms. But then I'll have to 
>figure out how to adjust the null from across the back yard. I thought 
>about feeding the receiver audio into an FM transmitter and listening 
>outside on a portable. That might be my best option.
>
>Can't seem to find much online about how to tune these things or gauge 
>performance. How does one know if it's working correctly?
>
>Advice or suggestions most welcome!
>
>
>-- 
>73,
>
>
>Les Rayburn, N1LF
>Maylene, AL
>EM63
>
>Member WTFDA, NRC, IRCA, & Medium Wave DX Circle
>Former CPC Chairman for NRC/IRCA
>
>============================== FM DX
>
>Sony XDR-F1HD, Sangean HDT-1, Elad FDM-S2, AirSpy.
>Denon TU-1500RD w/Ray Dees RDS Decoder,
>FM6 Antenna with CM7777 Mast Pre-Amp, RG-11.
>
>"Nothing but blues and Elvis and somebody else's
>favorite song..."
>
>AM DX
>Elad FDM-S2, Wellbrook ALA1530+ Loop, Clifton Labs Active
>Whip, Superloop. Quantum Phaser, Kiwa Loop, Palstar MW Pre-Selector
>

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