[IRCA] 7.5" Slider Loopstick DT-200VX Created-- Equals Slider E100's in Sensitivity

[D1028Gary@xxxxxxx]

Hello Guys,
 
     In preparation for making an  ultra-sensitive Sangean DT-400W model, an 
experimental loopstick consisting  of a movable coil of 40/44 Litz wire was 
wound on an Amidon type 61 7.5" ferrite  bar, and transplanted into a Sangean 
DT-200VX model (which has the  same loopstick as the DT-400W).  The result was  
another ultra-sensitive radio, with weak-signal capability exceeding that  of 
the stock ICF-2010 and E1, and equal to that of the new Slider E100's.
 
     The DT-200VX/ DT-400W stock coil system consists  of a base coil of .196 
microhenry inductance (at the 600 kHz peak position on  the ferrite bar), and 
a smaller "piggybacked" coil of .016 microhenries.   The piggybacked coil is 
wound on the side of the base coil closest to the center  position of the 
ferrite bar.
 
     Initial tests at night revealed equal sensitivity  with the new Slider 
E100 radios, which have become very popular among the  Ultralight enthusiast 
group.  Two weak nighttime signals were used to  check this-- the Yakima TIS on 
1610 kHz, and the INE beacon on 521 kHz.
 
     Despite the supremely high sensitivity, the  Slider DT-200VX lacks the 
relative signal strength bar graph of the E100, making  the coil peaking 
strictly an audio judgement task.  It also lacks the  E100's ability to tune in 1 
kHz increments, making it unlikely to compete with  the new Slider E100's in 
popularity among transoceanic DXers.  As might be  expected, the selectivity with 
the stock IF filter is also a shade less  favorable than the Slider-only 
E100, matching the relative selectivity  performance of the stock models.  
However, for those with dreams of making  their Sangean DT-200VX or DT-400W models 
ultra-sensitive for supreme weak  signal DXing, the new Slider DT-200VX is an 
exciting reality.
 
     73,  Gary DeBock    (in frozen  Puget Sound, WA)
 
 
 
 
 
       .   
**************One site keeps you connected to all your email: AOL Mail, 
Gmail, and Yahoo Mail. Try it now. 
(http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolcom00000025)
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx