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Re: [TowerTalk] LP-100 digital wattmeter with complex impedancedisplay

To: Jim Lux <>
Subject: Re: [TowerTalk] LP-100 digital wattmeter with complex impedancedisplay
From: Larry Phipps <>
Date: Tue, 21 Mar 2006 10:38:44 -0500
List-post: <>
The stripline coupler was under development when the article was 
submitted to QEX, but I abandoned it for a couple reasons by the time 
the article was published. There are two BNC cables between the coupler 
and the main chassis. All level and phase detection are done in the main 

Larry N8LP

Jim Lux wrote:
> At 12:26 PM 3/20/2006, Larry Phipps wrote:
>> Hi Jim. It's the version published in QEX except for the added circuitry
>> and firmware to handle the phase detection and complex impedance calcs.
>> It also uses a newer, faster PIC, and has the
>> powder-coated/silk-screened enclosure mentioned in the article.
> So it has the detectors at the remote head and a N-conductor cable 
> back to the controller?  The QEX article talks about both.  The parts 
> list in QEX is for the transformer coupler, but you've also got a 
> section "continuing development" and a photo (Fig 11) of the stripline 
> style coupler.
> >
>> > Is the LP100 the version with the stripline coupler and the detectors
>> > at the probe or the version with the dual transformer coupler and RF
>> > going back to the box?
>> >

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