[ARC5] AM linear amplification

[Sheldon Daitch]

The irony of that high power line to RF efficiency is that in cold climates, heat has to be added to the building to keep it comfortable for people to work.

In many TX sites, the waste heat from the transmitter was used to heat the building.


73
Sheldon
WA4MZZ


________________________________
From: ARC5 <arc5-bounces at mailman.qth.net> on behalf of Jim Wiley <jwiley at gci.net>
Sent: Tuesday, December 20, 2016 2:20 AM
To: Ian Wilson; ARC-5 Mail List
Subject: Re: [ARC5] AM linear amplification


He converted (replaced) the KICY 50-KW  DX50 Harris (now Gates)  transmitter at Nome, Alaska this way and achieved something on the order of a 90% efficiency (AC power in to RF out) power after the change.   Failed RF modules can be "hot switched" with no loss of air time.   The transmitter experiences a 3-degree rise in cooling air from outside air intake to exhaust, when running at full rated  power.

ing conditions.

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