The best directional couplers that I have used for HF power are the
Werlatone model C1460, rated for 2 kW through power, with -50 dB
coupling (+/-0.5), from 0.01 - 250 MHz. Over the HF portion they have
less than 0.1 dB insertion loss and about 24 dB of directivity. They
have much ferrite inside the box, and are large things. I own one and
have another at my workplace.
73
John
K5PRO
> Message: 3
> Date: Wed, 2 Dec 2009 20:14:04 -0500
> From: "Carl" <km1h@jeremy.mv.com>
> Subject: Re: [Amps] Dummy Loads & Wattmeters
> To: "Dr. David Kirkby" <david.kirkby@onetel.net>, "Lynn Osterbur"
> <no9z@yahoo.com>
> Cc: amps@contesting.com
>
> Constructing a 1.8 to 30 mHz high power directional coupler with 30dB or
> more directivity is not an easy task.
> Ive built them for 1 or 2 bands at VHF and above and use a HP-437B for
> accurate results. The couplers are used also to drive the spectrum analyzer.
>
> Carl
> KM1H
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