[CQ-Contest] W3NQN Bandpass Filters (Was: Re: 419band passfilters..

[W0UN -- John Brosnahan]

At 12:17 30-03-07, Marijan Miletic', S56A wrote:
>Zack, I learnt filters theory in 1960's and I know that 7 pole ones 
>(Dunestar) are better than tapped 6 poles (W3NQN).


Mario --

This may be part of your misunderstanding about the Dunestar and W3NQN filters.

The Dunestar filters are NOT  7-pole but rather  3-pole designs.

This info is taken from the Dunestar website.

http://www.dunestar.com/model300.htm

CONSTRUCTION: The filters are 3-pole, top-C coupled.
Hi-Q capacitors and inductors are used for tuned circuits.

73  --  John  W0UN