Not to start any trouble here, but what about the newer
software-compensated meters/directional couplers sold in the ham market?
A quote from a well-known model's marketing material:
"Power accuracy is better than 5% at any frequency from ~1W to maximum,
3% typical with NIST traceable factory calibration"
Assuming 3%-5% is fine and dandy for my uses, do these sound like
achievable numbers? After watching the Bird comments go by (and having a
small investment in Bird equipment) I'm starting to check labels... ;-)
Thanks and 73,
Jim, N7CXI
John Lyles wrote:
> 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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>
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