1500 watts is 386 volts peak from the RF.
A 1 meg ohm resistor across that will have a peak current of 386 micro amps.
That is .15 watts that the resistor will have to dissipate.
Old ohms law sure is useful. :>)
Keep in mind that not surge devices are necessarily the same. A unit made
for one frequency range may have different firing points at different
frequencies.
73
Gary K4FMX
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of k2wd@comcast.net
> Sent: Tuesday, May 17, 2011 12:32 AM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Polyphaser vs. ICE
>
> I am using a number of Polyphaser units in line just before my cables
> enter my home. I have opened them in the past to discover that there is
> nothing more than a surge device from the center pin of the antenna side
> connector to ground, then a capacitor from the antenna side center pin
> to the radio side center pin. Matter of fact, I converted some UHF range
> units to HF range by simply replacing the capacitor with the same value
> used in a factory built HF range unit (I forget the exact value at the
> moment but it was either a 0.1 or 0.01uF disc).
>
> This does not provide any kind of static dissipation. Can I simply open
> them up and add a 1Mohm resistor in parallel to the surge device
> (antenna center pin to ground) to allow for static dissipation?
>
> Or will this affect the original performance of the unit?
>
> If this is ok, will a 1/4w or 1/2w resistor handle 2kw key down? I don't
> think anything larger will fit inside. So far the stock Polyphaser units
> have passed the key down test.
>
> Thanks
> Eric
> K2CB
> Sent on the SprintR Now Network from my BlackBerryR
> _______________________________________________
>
>
>
> _______________________________________________
> 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
|