[CQ-Contest] seeking 9band bandpass filter unit

Wayne Kline w3ea at hotmail.com
Tue Jul 21 14:28:59 EDT 2015

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 


> To: cq-contest at contesting.com
> From: k9yc at 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
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest at contesting.com
> http://lists.contesting.com/mailman/listinfo/cq-contest

More information about the CQ-Contest mailing list