-----Original Message-----
From: Talbot Andrew <[email protected]>
To: '[email protected]' <[email protected]>
Date: 06 December 2000 12:39
Subject: LF: Re: LF keep cool
Some of us don't have such large antennas as you, Peter. For 1 Watt ERP
I would need approx 4kW RF.
Anyone got any cheap 3 phase 500V bridge rectifiers ?
The Litz wire around surplus now will do a better job at keeping cool
than copper tube at these frequencies.
Not as good as 25mm water cooled but the pump pressure must be adequate,
otherwise at the 3 - 5 kw power you will get MELTDOWN.
Andy G4JNT
With a transmitter running 900watts I can get 1watt erp even with my
'bit of wet string' so there is no need to run more power. To get
1watt erp I have to obtain 4.5amps antenna current with my antenna.
The coil is wound with 1.5mm Litz wire (2.5mm including plastic
insulation) with an RF resistance of approximately 5ohms and will
dissipate around 100 watts during key-down periods.
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