Date: Mon, 18 Apr 2016 15:15:34 -0700
From: jimlux <jimlux@earthlink.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Triplexer
On 4/18/16 8:06 AM, Jim Thomson wrote:
> ## do they actually work good ? Can you stuff 4.5 kw up through 213 U..
> or do you use bigger coax ? They must be some serious coin.
0.405" coax can handle 3700V, so your practical limit is going to be
current/heating. On 40m, 3700W is the rating, on 20, 2600W. So 4500W
would be a lot.
&&& No, what I meant was say 3 amps, all running 1.5 kw RTTY.. simultaneously
= 4.5 kw average power. Per Eimac, that would be the same as a 3 tone signal,
with each tone having an average power of 1.5 kw.
(Number of tones) squared, X 1.5 kw = 13.5 kw pep out.
13.5 kw pep out = 825V rms = 1166 V peak.
&&& 4.5 kw average, would be max worse case. Still, on CW, with all
3 on TX, it would still be aprx 2 – 2.25 kw average. So it may still work.
&&& The other issue would be the tribander would be pointed in 1 direction,
so all 3 bands would also be in one direction, which may not be what you want.
But folks with rotating towers face the same dilemma.
Jim VE7RF
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