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Re: [TowerTalk] Mounting Polyphaser IS-RCT to SPGP

To: Dick Green <>
Subject: Re: [TowerTalk] Mounting Polyphaser IS-RCT to SPGP
From: John Kemker <>
Date: Fri, 12 Jun 2009 03:20:25 -0400
List-post: <">>
Mostly because of copper's improved conductivity over aluminum, as well 
as its electrical behavior when corroded, as opposed to aluminum's.

However, I'm sure there are plenty of folks using aluminum without any 
problems.  Given the choice, however, I'll choose copper over aluminum 
for ground plates any day, especially for lightning protection.

Dick Green wrote:
> Why do you advise against an aluminum ground plate? Are you only against 
> outdoor use or indoor as well? I have a pair of Hoffmann metal utility 
> cabinets with aluminum grounding plates inside. They seem to be fine and 
> haven't corroded a bit.
> 73, Dick WC1M
>> -----Original Message-----
>> From: John Kemker []
>> Sent: Thursday, June 11, 2009 11:47 PM
>> To: Peter Dougherty
>> Cc:
>> Subject: Re: [TowerTalk] Mounting Polyphaser IS-RCT to SPGP
>> The ICE might be a better solution, in any case.  However, to each their
>> own.
>> I'd advise against the aluminum and seriously check out
>> for their copper plates.  VERY reasonable prices
>> for 12"x12" sheets and straps.  I just got two in the mail that I'll be
>> mounting for the tower base.  It cost less than the great eBay deal I
>> got on a PolyPhaser copper plate mounted on MDF I purchased a few years
>> ago.  As in five times less money.  (I spent $45 before shipping on the
>> PolyPhaser plate.  I spent $9 before shipping on the GA-Copper plate.)
>> They also sell the wide copper straps for grounding and the copper
>> anti-oxidant grease, as well.  All in all, good deals on good product.
>> Peter Dougherty wrote:
>>> My Round Tuit finally arrived and I'm hoping to have my single-point entry
>>> panel finished in a couple of weeks. What I'm trying to figure out the
>>> proper way of mounting the Polyphaser IS-RCT (8-terminal rotor control
>>> protector) to the panel. It's a solid box with a ¼"-20 one-inch stud coming
>>> out the top and there are no mounting flanges on the box. My original plan
>>> was an 18 x 24" copper or aluminum plate to which all the suppressors would
>>> be mounted, and 2" strapping to the bonded system. The thing of it is, none
>>> of the polyphaser devices are made for panel mounting-neither these IS-RCT
>>> boxes or the high-power coax supressors, which are bulkhead-mount only.
>>> I'm really stumped here and I think I may just end up selling these and
>>> getting ICE devices instead. Any suggestions?
>>> Also, would I be just as well to get aluminum sheeting for the SPGP, then
>>> using copper strap with a thick layer of NoAlox where the strap meets the
>>> plate? Would I run into problems if I ran two 2"-wide by foot-long buses
>>> tied together by 2" strapping or is it better to go with a single large
>>> plate instead?
>>> Thanks in advance.
>>> -----------------------------------
>>> Regards,
>>> Peter,
>>> W2IRT
>> --
>> --JohnK
>> 73 de W5NNH
>> 10X 75371/M&M 117/SMIRK 6185/Six Club 285/TRA 2499/Norcross 228 F&AM

73 de W5NNH
10X 75371/M&M 117/SMIRK 6185/Six Club 285/TRA 2499/Norcross 228 F&AM

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