[TenTec] Colliins SWR Bridge.....I'm also interested in EWR-PWR instrumentation.

[al sirois]

0700 EST
13 December 2009

Good morning, all:

I'm not overly impressed with the commonly accepted Bird meters in the ham
community. I am looking for something much better, for sure. Guess I should
look into this Collins Bridge 312B-4 or go to calibrated occiliscopes.

73
Al Sirois
East Boothbay, ME
N1mhc at arrl.net
==============

-----Original Message-----
From: geraldj [mailto:geraldj at storm.weather.net] 
Sent: Sunday, December 13, 2009 2:16 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Colliins SWR Bridge




---------- Original Message -----------
From: ac9s at mchsi.com
To: tentec at contesting.com
Sent: Sat, 12 Dec 2009 18:26:50 -0600 (CST)
Subject: [TenTec] Colliins SWR Bridge

> Jerry,
> 
> You wrote: "Many a ham SWR meter is a very rough approximation of SWR and
even 
> when it shows matched, the impedance and reactance may be a ways from 50
ohms 
> resistive. Birds aren't bad, Collins wattmeters I think have a much better

> design. But then I'm biased, I have one of their reject designs
> (I worked with the department that did ham gear designs in 1963) and its 
> plenty good but not good enough for their specifications. There's a lot
more 
> shielding in their better design to control stray couplings that would
make 
> the readings wrong."
> > >
> 
> Does the 312B-4 include the better bridge design?

Yes.
> 
> Thanks --
> 
> Keith
> AC9S

73, Jerry, K0CQ

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