[Amps] Decent HF directional coupler for RF power meas.

[John Lyles]

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 at jeremy.mv.com>
> Subject: Re: [Amps] Dummy Loads & Wattmeters
> To: "Dr. David Kirkby" <david.kirkby at onetel.net>,	"Lynn Osterbur"
> 	<no9z at yahoo.com>
> Cc: amps at 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