[AMRadio] B&W 850-A vs 852 Pi-Network assembly


John Parker parkjv1 at comcast.net
Mon May 28 22:02:03 EDT 2007


Larry,

I will check, I think I may have an 850A.

$65.00 plus shipping from 98072....

73 John KD7KFT



-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Larry WA9VRH
Sent: Monday, May 28, 2007 6:01 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] B&W 850-A vs 852 Pi-Network assembly

Hi Scott,

I will keep looking for an 850-A as it would be the best way to go. Thanks
for the info and I would appreciate a copy of the chart.
Address and email is good on QRZ.

Thanks!
Larry

----- Original Message -----
From: <Ka9p at aol.com>
To: <amradio at mailman.qth.net>
Sent: Monday, May 28, 2007 8:00 PM
Subject: Re: [AMRadio] B&W 850-A vs 852 Pi-Network assembly


> Larry -
>
> The 850A and 852 have the same voltage rating but the plate impedance for
> the 850A is 2500 to 5000 ohms, while the 852 is 1500 to 3000 ohms.
>
> In other words the inductance of the 850A is 13.6,6.5,1.75, 1 and 0.8
> microhenries, and the 852 is 7, 3.72, 2.34, 1.34, and 0.95 microhenries.
>
> I have a chart that shows capacity to resonate on each band, etc. from an
> old B&W catalogue if it would help. It's sure not a drop in, but I expect
you
> could make it work ok except perhaps on 80 with a bit of juggling.
>
> Good luck, Scott
>
>
>
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