Hi Jim. Bob 5B4AGN,s. Band pass filter kit,s are tempting. The site has
rough assembly (ballpark) winding facts. Being retired I my self no longer
have the access to a network analizer . The assembled kits are a work of art.
And IMHO a winner if you have access to the tools to achive the W3NQN design
limits
WayneW3EA
> To: cq-contest@contesting.com
> From: k9yc@audiosystemsgroup.com
> Date: Mon, 20 Jul 2015 21:09:29 -0700
> Subject: Re: [CQ-Contest] seeking 9band bandpass filter unit
>
> On Mon,7/20/2015 3:53 PM, Mike Smith VE9AA wrote:
> > I too would like to dabble my toe in the SO2R waters, but not at $2000+ to
> > get it here to Canada.
>
> Bob Henderson, 5B4AGN, has designed at least two very nice sets of
> bandpass filters based on W3NQN designs. One set covers the contesting
> bands, and uses a motherboard in an enclosure to house six filters on
> plug-in daughterboards. He puts together kits every year or so. Last I
> looked, cost was on the order of U$450, complete with custom built
> enclosures. Cost varies a bit with country (mostly shipping) and details
> of what options you want. The set includes a band decoder with drivers
> for antenna switching relays.
>
> A year or so ago, Bob designed a new set of filters to also cover the
> WARC bands, primarily for use by DXpeditions. They are on the same
> daughterboards, so are interchangeable with the 6-band enclosures, but
> are primarily used in individual enclosures, one filter per band. The
> 9-band set is designed with improved adjacent band rejection as compared
> to the original 6-band filters, and I'm building the improved filters
> for 20, 15, and 10 to replace those in my 6-band sets.
>
> I don't think Bob is doing a 9-band daughterboard and enclosure.
>
> For more info, google TXBPF. In addition to Bob's site, it will find this.
>
> http://audiosystemsgroup.com/BandpassFilterSurvey.pdf
>
> 73, Jim K9YC
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