Re: Quantum QX-Pro Loop with E100 slider?

John H. Bryant <bjohnorcas@...>


Your plans for the Universal plexy radio stand as a Slider Mounting board sound great.   When you finish an experimentation cycle, I sure hope that you will give us a brief write-up and photos. (GREAT THINKING, BY THE WAY.... I hadn't thought of one of those plexy stands... just an excellent idea!)

I might suggest that you hook the Quantum Loop directly to the existing stock ferrite bar first and see how that works for you (there are a couple of articles about that on You will loose the varicoupler aspect of the Slider+Ext. Antenna, but you will have a much bigger antenna hooked fairly efficiently through the stock ferrite bar.... If you are in an area with a lot of broadcast stations, you may get overloading... or you may not... If you do, the Slider as Varicoupler is the answer of course....

I guess what I'm saying is that you ought to take a couple of baby steps rather than one giant leap... since we are all still kijnd of feeling our ay along here.

ANYWAY, welcome aboard!!!

Sorry for the rushed response... I've kind of fallen into doing a 7-Day Ross Challenge and I gotta get back to the dials :>)

John B. 

At 08:35 PM 12/4/2008 -0500, you wrote:

     Thanks for your post, and welcome to Ultralight DX fun.
     The designers of the slider E100's (John Bryant and I) have experimented with coupling external antennas to the slider loopstick ferrite bar by using an inductive coupling system, where a BNC connector runs to a small coil of wire on the ferrite bar, on the side opposite the coil.  This not only allows the effective use of high gain external antennas like EWE's, K9AY's and beverages, but the slider coil can still be used as a preselector, filtering out unwanted image and spurious urban and suburban areas.  In such cases, the high gain of the external antenna "swamps" the slider loopstick RF pickup, so that there is no incompatibility or "competition" between the two antenna systems.  John's fine article posted on, "Slider e100 as a Varicoupler" gives full details.
     To my knowledge, nobody has yet tried this slider E100 inductive coupling system with a smaller antenna, like the Quantum QX-Pro Loop.  This is one area of experimentation that is still uncertain. The 7.5" loopstick slider E100 by itself is capable of great sensitivity, as any owner knows.  During summer experimentation, experimental 17", 22.5" and 27" ferrite bars generally didn't provide the hoped-for great sensitivity benefits over the 7.5" models. After building your slider E100 and testing it out with the Quantum QX-Pro Loop, you may also discover that the 7.5" model provides a lot of "bang for the buck." But we certainly would be interested to know your results, either way.  Good luck on your slider project.
     73,  Gary DeBock

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