Re: [IRCA] "Hot-Rodded" DT-200VX Digital ULR is a Reality

[D1028Gary@xxxxxxx]

To Mesa Mike,
 
     Thanks very much for your comments on the DT-200VX  antenna transplant 
operation.
 
     The DT-200VX stock antenna has two separate  coils-- a longer base coil, 
and a "piggyback" shorter coil, for a total of 4  connections. A transplant 
"surgeon" should attempt a larger-proportion  "copy" of the original 2" 
loopstick, reducing the number of coil turns slightly  for the huge transplant 
loopstick, to compensate for the increased inductance of  the much longer ferrite 
bar.  The original connections to the DT-200VX must  be exactly observed, in the 
transplant operation.
 
     Mike, I have never considered the SRF-M37V as a  suitable candidate for 
transplant, primarily because of its urban RF issues  (spurs and images) in 
stock form.  In these experiments, if your  mega-transplant is successful and 
you get a "nuclear" boost in sensitivity, you  will also get a huge increase in 
any negative effects like spurs and  images.  You will also have HUGE signal 
strength from your locals,  putting a premium on selectivity. For this purpose, 
the two successful  mega-transplant operations were purposely performed only 
on two ULR's with  great stock resistance to urban RF issues, and decent stock 
selectivity.   Both of these transplant experiments have proven the wisdom of 
this  approach.  IMHO, the DT-200VX is the only suitable digital ULR for a  
mega-transplant... all the others would have mega-problems with spurs, images  
and selectivity.  What we all greatly desire is simply a huge sensitivity  
boost-- not a huge boost in RF problems.
 
                                                                              
                    73 and Best Wishes,
 
                                                                              
                    Gary 



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