[ARC5] HF Balun unknown type -- Help?

[J Mcvey]

To be clear, the pot is on the secondary!
 

    On Saturday, November 5, 2016 9:53 PM, J Mcvey <ac2eu at yahoo.com> wrote:
 

 Do you have any test equipment, such as a signal generator, scope or VNA?It's real easy with a VNA or antenna analyzer.Hook up to the analyzer with the 50 ohm side and a pot and adjust till you get 50 ohms on the display.Remove the pot and measure the resistance. Divide by 50 for the "n" value.Same concept with the scope and gen but a few more steps...
 

    On Saturday, November 5, 2016 9:32 PM, Mike Everette via ARC5 <arc5 at mailman.qth.net> wrote:
 

 I have a nice doorstop -- a large and heavy cast aluminum box about 8 inches by 10 inches on top and 10 inches deep, with fins on the sides and filled with oil.  It has what I think is a C type coax connector on the input and a pair of beehive insulators about 2 inches tall, with a type of silver plated slide-on connector atop each, for the output.  The nomenclature plate reads:
179P-25HF BALUNDSGN ACT CODE 13499 PN 758-5327-002SERIAL No. 090CONTRACT FO4606-77-C-0896  U.S.
An ink stamp near the nomenclature plate reads "REV.D"
No manufacturer name is given.  No additional data.
Does anyone have an idea about the characteristics of this unit?  I've searched these numbers on line and found nothing.
This came from a field-deployable antenna system kit consisting of at least 2 aluminum towers, guy ropes, some very light weight and flexible long coax lengths with C male connectors, large non inductive termination resistors, etc.  I think this must have been a V-beam type antenna, or perhaps a rhombic if it was supposed to have four towers instead of the two found with it in a bunch of surplus.
Looks like it might be rated for a good bit of power.
Could it possibly be a 10:1 or 12:1 balun?  If it was intended to be used with a V-beam or rhombic, that would be my guess.
Any help IDing this doorstop will be greatly appreciated!
73
Mike
WA4DLF
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