Re: Transplants: Are We Missing Something Here?

John H. Bryant <bjohnorcas@...>


I understand what you are saying - that with a small plastic radio and noise hitting the circuitry, shielding the loop stick is unlikely to improve rejection of noise from the local environment - and I think that you are likely correct. However, when I used that Ramsey unit that worked so well in Santiago, it was running my Eton E1, which is a plastic case crammed with circuitry, of course.....  That being the case... this is one test that I've just gotta try.

I think that I'll go "whole hog" as usual and use RG-174 mini-coax for the run between the circuit board and the bar... connecting the shield of the coax to the ground plane of the board and to  an aluminum foil shield on the bar.  The other reason that I gotta try this one is that the material costs are near zero and its an easy + very reversible test.  As you say, probably won't work, but I just gotta try.

Gary, great catch on the influence of the whip antenna on the bar of the E100.  The easiest fix in the world, of course, is to unscrew that little Phillips screw at the antenna base (back side of the radio) and just lift that puppy outta there. It leaves `a hole in the case and destroys FM and SW, but if the radio is dedicated to MW DXing, it seems a winner all around.  Of course, to get back to factory specs, all you do is put the whip back in place and tighten the screw. I know that you are aware of all of this, Gary, but folks who haven't opened the back of the E100 may not be .

Is there something that I'm missing that is a problem with removing the whip... other than the loss of FM and SW??? Removing the whip gives me a perfect-sized hole to run those two pieces of mini-coax thru, of course.

John B.

At 03:38 AM 5/15/2008 -0400, you wrote:

     Ultralight radios, by nature, are plastic-enclosed electronic devices subjehis is one that Ict to RF noise issues.  Shielding the leads to external ferrite bars wouldn't accomplish much, since the RF hash would still strike the external loopstick (or booster bar), as well as the internal circuitry (plastic usually doesn't shield anything).
    DXpeditioners desiring great Ultralight reception either need to have an RF-hash free room (like the famous Room 15) or get out of an RF-hash area, and walk toward the beach.
    During the last fruitless DXpedition to Westport with Guy Atkins (May 4), our room in Westport was full of RF hash, TV heterodynes, etc.  We ended up driving to the beach at Grayland (4 AM), only to find a steady stream of clam diggers proceeding to the beach in their RF-hash producing beater cars, hi.
                                                                                         73,  Gary

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