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Date Posted by Category User IP

2012-05-17 (UTC)

W4VKU

Filters

Dayton delivery- Polyphaser 18 line surge suppress

Polyphaser Impulse Suppressor (Brand new - Made in USA)
Price - $45
---------------------------------
MODIFY and USE for STEPPIR/Rotator lines
-----------------------
Lots of pictures
https://docs.google.com/leaf?id=0BzE1lnTIwbphMjA5NTg2OWUtZDE3Zi00ODRhLWJmZGUtNzZjMzgxMzhiNTE3&hl=en_US
------------

Specifications from the enclosed Data sheet
-------------------------------------------
089-0511-B.2 is a 9 pair or 18 wire EMP protector designed to provide -60db of
attenuation from 3Mhz to 10Ghz and common mode protection on all incoming lines.
Turn-on voltage of +/-330VDC is the gas tube threshold for all these lines, ringing
voltage of +/-180V peak is permitted.

Assessment of the unit
----------------------
The unit is very well built. Solid die cast aluminum enclosure with Feed through
grommets. The gas discharge tubes(GDT) are outside the unit, right behind the terminal
strip chamber that hosts the screws to attach the lines. Right after the GDTs, the feed
through grommets connect the lines to a circuit board that appears to have a very
large MOV and a current limiting resistor.

The other end of the line is pretty much soldered to a feed through grommet and is
exposed at the rear of the units exterior. I was told that this was a special unit made for the
military. The box has date code of 1995.

This is a large box and you can see the dimensions in the images i have hosted on
google docs ( scan of the data sheet).

Points to Note
---------------
1) The unit is NOT waterproof and it will need to be mounted indoors or
inside a waterproof enclosure.

2) There is no mounting bracket, so a grounding strap with a lug will need to be
provided to fasten it to one of the bolts to secure this unit to a good RF ground.

Application
------------
The 18 protected lines in a single package was very attractive. A 3 Element Steppir (12 lines)
along with a Yaesu rotor (6 lines) protection could be accomplished with a single unit. The turn on voltages
are very high (330V), but like i have shown in one of the units that i had modified for personal use,
one can solder the right Metal Oxide Varistors(MOV) for their desired turn-on voltage along with Ceramic bypass
capacitors to discharge static. This mod will make the specs tight with a lot of paths to discharge
the surge as the strike voltage rises. Again the MOV's can be tailored to ones needs.

UNIT SOLD BRAND NEW WITHOUT ANY MODS. BUYER WILL NEED TO MAKE MODS PER THEIR REQUIREMENT IF NECESSARY

For the price, the build quality of this "Made in USA" polyphaser product is outstanding.

https://docs.google.com/leaf?id=0BzE1lnTIwbphMjA5NTg2OWUtZDE3Zi00ODRhLWJmZGUtNzZjMzgxMzhiNTE3&hl=en_US


Additional questions - Please contact me at w4vku at yahoo in the dot com

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