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Author Topic: Military surplass antenna AS-2851/TR...Any info?  (Read 1698 times)
KL0PE
Member

Posts: 24




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« on: May 05, 2001, 08:37:59 PM »

I picked this thing for a song today at a yardsale.  It's in perfect condition, has all the parts, and came in its original green carry bag.  Here's a brief description I pulled off a website:

"AS-2851/TR PORTABLE LOG PERIODIC ANTENNA/20 FT MAST KIT. Mast kit has 4 metal and 2 fiberglass sections to make 20 FT mast. With guy rope and swivel base. Log periodic antenna has 71 inch boom, shortest element is 34 inches, longest is 98 inches. Probably 26 to 177 Mhz - no specific data. 38 lbs"

I haven't assembled it yet, but the diagrams look like it's a 5 to 7 element Yagi.  Can anybody give me any more information?  The description gives a frequency ranged preceded by "probably".  Can anybody give me more specifics?  How old is this thing?  When/Where was it used?  The description printed on it indicated that it was Marine issue, and the carrying bag has these really nifty straps on it so you could carry it like a back-pack.  I would love to know more about it.

By the way, I picked it for $25.  The webiste that I got the above information from has it listed for $145.
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WB6BYU
Member

Posts: 13335




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« Reply #1 on: May 07, 2001, 11:38:08 AM »

The frequency range of a log-periodic can usually be determined
from the lengths of the longest and shortest elements.  The 98 inch
element indicates the lowest frequency is probably around 60 MHz
(or a bit higher.)  The 34 inch shortest element puts the maximum
frequency around 160 MHz.  So it looks like it should work for 2m,
as well as FM broadcast, aircraft band, and TV channels 3 - 6.
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