Thread: DLM Comparisons
View Single Post
  #4   Report Post  
Old November 28th 07, 05:56 PM posted to rec.radio.amateur.antenna
John Smith John Smith is offline
external usenet poster
 
First recorded activity by RadioBanter: Nov 2006
Posts: 2,915
Default DLM Comparisons

Richard Fry wrote:

...

Because the claim has been made that the standard DLM is the equivalent
of an unloaded, 1/4-wave monopole when both are used with the same r-f
ground. Investigating that was the purpose of the exercise.

RF


The first DLM I constructed was 1/4 wave, it convinced me I should
attempt the 1/2 wave version ... the 1/4 wave version DOES make a great
stealth antenna--10m version 2'+" .

The 1/2 wave version 5'+" , a 1/4 10m reference = ~8'.

Due to the lower takeoff angle of the 1/2 wave DLM, it compares much
more favorably with the physical length of a 1/4 wave reference
antenna--and is actually of a shorter physical height.

No single antenna is the solution for all real world situations.
However, I have no bone to pick with any particular antenna(s) or
personalities ... I only have needs which particular designs may offer me.

Strange how the DLM is a VERY GOOD solution to some real world
problems/situations and that, since it is considered "unconventional",
causes so many to turn a blind eye.

Who says the DLM is the best construction in this particular direction
of physically short antennas, perhaps it can be engineered to even
greater performance--however, to do so would require an atmosphere of
experimentation, trial-and-error, etc. which was in the ORIGINAL
purposes of the amateur radio service ... too bad so many forget.

Regards,
JS