Folks can go to TESSCO and purchase gas tube arrestors inexpensively. IT is
relatively easy to determine the right unit for your application. I recently
purchased eight gas tubes to homebrew a rotor control protector. The price
per gas tube was $1.70. A very low cost way to get reasonably good
protection. I love the Polyphaser product line...just can't justify the
cost!
73,
dave
wa3gin
----- Original Message -----
From: "jimlux" <jimlux@earthlink.net>
To: "Steve Davis -Davis RF Co." <sdavis@davisrf.com>
Cc: <towertalk@contesting.com>
Sent: Saturday, March 14, 2009 11:12 AM
Subject: Re: [TowerTalk] For Sale: PolyPhaser IS-3T1 12 Cond in
lineprotector
> Steve Davis -Davis RF Co. wrote:
>> 12 conductor protection, T1, data line protector, multi strike, 36,000
>> Amps.
>> RS232/422. 6 twisted pair (or single conductors up to 12 conductors).
>> Cast
>> alum enclosure and all hardware SS. Surface mount right angle brackets
>> (4).
>> Specs, picture and drawing:
>> http://www.polyphaser.com/productdetail.aspx?item=IS-3T1
>> Excellent condition. Original price:
>> $ 343.00 . Selling now: $ 195.00 plus shipping, insur, tracking.
>> This
>> is from my personal ham equipment and I will guaranty it works. Contact
>> me
>> off TT please.
>> 73, Steve, K1PEK
>>
>
> Something to be aware of when using such devices (not directed at Steve
> here, but because I happen to be writing up something on these for
> another reason, and this reminded me of it)
>
> There's 4 basic schemes used for protection inside this kind of box
> (oddly, PP doesn't say which in their datasheet, for this particular
> device).. a gas tube, a back to back zener diode, a MOV, or a series L,
> shunt C sort of arrangement.
>
> The MOV style wears out. Everytime a transient comes down the line, the
> MOV dies a little bit. (that's what leads to those plug strip fires)
>
> All of the data protectors have a voltage rating, which can bite you if
> you're not careful. Hooking a 24VAC relay control on a 7V telecom
> protector will probably cook the protector (Yes.. I should have found
> the datasheet before hooking it up.) Watch out for RMS vs Peak voltage
> too, especialy if you're using a device that is usually for DC
> applications (telecom)
>
> The PP IS series has been replaced by the PP IX series. I don't know
> all the differences, but the IX (for some part numbers) is UL listed, so
> if you're worried about NEC compliance, check first. None of the usual
> ham coax devices from PP is UL listed, so they can't serve as your
> "listed antenna discharge unit" for instance.
>
> Jim, W6RMK
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|