[TowerTalk] Telrex TB5

[dj2001@isd.net]

Tom, thanks for the ideas, first I'm going to attack the darned thing 
by re-cleaning the elements and double checking the joints.  I failed 
to check and clean the inside trap screws because I couldent get em 
loose, (poor excuse) but I do have a bigger screwdriver.  If that 
fails to work then Ill take your suggestions and tinker with the 
traps.  As far as the length of director and reflector I dont think 
anything has changed here, I've had the antenna for twenty years and 
don't recall having the problem before but, I dident operate much ten 
until the last couple years and I've just lived with it.

73

Dale J.
K9VUJ
Bloomington, Minnesota







At 22:09 -0600 07/25/2000, n4kg@juno.com wrote:
>We had a Telrex TB6EM at the University of Michigan ARC,
>W8UM, back in the 60 / 70's and noticed a similar problem.
>There was almost no pattern on 10M and the SWR was high.
>
>We re-resonated the 10M traps by adding a "gimmic" across
>the trap.  A "gimmic" is a pair of parallel wires taped together
>with opposite ends connected across the trap and the other
>ends unterminated.  I believe we had about 4 inches of overlap.
>I don't recall the size wire.  #14 insulated copper wire should
>work OK.
>
>Check the lengths of the 10M reflector and director.  My
>guess is that they were tuned for use at 29 MHz.  You can
>model a tribander as a 10M monobander fairly easily to
>see where the 10M elements should be tuned.
>
>73 / GL,  Tom  N4KG
>
># # # # # # # # # # # #
>
>On Tue, 25 Jul 2000 14:30:02 -0500 dj2001@isd.net writes:
>>
>>  Here we go again with the Telrex.  I'm searching back thru the
>>  postings but have not come up with anything yet.
>>
>>  Does anyone know what the values of the capacitors are in the traps
>>  for the Telrex TB5EM tribander?
>>
>>  I think I might have some bad ones and dont want to tear into it
>>  unless I'm sure I can fix it.  The antenna works but not very well
>>  on
>>  ten.  Twenty and 15 seem ok except on 15 the resonant freq is about
>>  21.45 and drops off slowly well down the band, its acceptable.  Ten
>>  is at 29.3 and 2/1 best case.  I have rebuilt the balun and cleaned
>>  everything.
>>
>>  Dale J.
>>  K9VUJ
>>
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>
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