|[AMRadio] B&W 850-A vs 852 Pi-Network assembly|
ars.w5omr at gmail.com
Mon May 28 22:00:10 EDT 2007
>> 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.
> Larry WA9VRH wrote:
>> 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.
While I know that the B&W butterfly cap is worlds different from the
pi-net tuning unit, it should be noted that the wider the impedance
rage, the easier it's going to be to match it with a 'normal' sized
capacitor. The capacitance on the tuning cap in my push-pull, link
coupled final isn't -quite- enough for 75m. A split-stator capacitor
was added in parallel to allow the tank circuit to resonate on 75m.
I understand if you think the 850-A is what you've designed the rig
around, but from what I see about the 852, it's range is more dynamic.
Something to think about.
73 = Best Regards,
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