[TowerTalk] 4 square for 80

[jimlux]

On 9/25/16 5:53 PM, Guy Olinger wrote:
> The 1.5 kW PEP is at the amplifier output.
>
> That has been clarified with the FCC multiple times. Tuner, feedline,
> antenna system losses are your problem. You are diminished by those
> losses unless you either have no losses, or run illegally.
>

Interesting, can you point to an opinion letter or enforcement action 
that says this?

> The commercial measurement scheme does not apply to the amateur service
> except for a couple bands where that particular band references
> effective radiated power. 1.5 kW is not allowed on those amateur bands.
>
> 73, Guy K2AV.
>
> On Sun, Sep 25, 2016 at 7:07 PM, jimlux <jimlux at earthlink.net
> <mailto:jimlux at earthlink.net>> wrote:
>
>     On 9/25/16 12:05 PM, Guy Olinger wrote:
>
>         On Sun, Sep 25, 2016 at 12:25 PM, Jim Brown
>         <jim at audiosystemsgroup.com <mailto:jim at audiosystemsgroup.com>>
>         wrote:
>
>             On Sun,9/25/2016 6:49 AM, Steve London wrote:
>
>             What problem(s) are we attempting to solve with chokes on
>             the 4-square
>
>                 feedlines ?
>
>                 Noise.
>
>
>
>         Noise, yes. Gotta give you that one, but the main reason for the
>         4 square
>         was TX gain, right? You do have listening antennas for 160 and
>         80? So we
>         have to worry about *loss*. Loss eats up gain from patterns.
>         Loss eats up
>         amplifier output. Your *system* gain past your transceiver is
>         antenna gain
>         + amplifier gain *** minus LOSSES ***.
>
>         Diversion of power to miscellaneous conductor paths is almost
>         universally
>         lossy and never in directions and modes desired in our attempts at
>         directional arrays.
>
>
>     So measure your output power at the system interface to the
>     "antenna".. put 1500 watts (total) into your 4 antennas: sum the
>     powers at each element (including if you have phased them so you
>     have a negative element).  That's what commercial broadcasters do,
>     isn't it?
>
>     The regulations don't say "amplifier output", they say
>     "PEP (peak envelope power). The average power supplied to the antenna
>     transmission line by a transmitter during one RF cycle at the crest of
>     the modulation envelope taken under normal operating conditions. "
>     "(b) No station may transmit with a transmitter power exceeding 1.5
>     kW PEP. "
>
>     If I define my "antenna transmission line" reference plane at the
>     antenna feed points, I think that works.
>
>
>
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