[RFI] Your Bandpass Filters

[Hare,Ed, W1RFI]

I found the following doing a web search on "Dunestar filter":

http://www.k6xx.com/radio/dunestar/ds504.html
http://www.k6xx.com/radio/dunestar/ds600.html

There were others that appeared in the search results, but these two stood out as partially answering your questions.

Ed Hare, W1RFI
ARRL Lab


> -----Original Message-----
> From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com]On
> Behalf Of Jim Brown
> Sent: Monday, February 16, 2004 11:21 AM
> To: dunestar at QTH.com
> Cc: RFI List
> Subject: [RFI] Your Bandpass Filters
> 
> 
> Someone pointed me to your webpage for bandpass filters for the ham
> bands. It looks like some of your products might be useful to me, but
> there aren't enough specs for me to know. 
> 
> 1. What is the power rating of the various filters?  I see a statement
> to the effect that they are "designed to be used with transceivers."
> Does that mean 100 watts PEP or CW and 50 watts for continuous modes
> like FM or RTTY/PSK? Or does it mean 0.5, 2x, or 3x  those numbers? 
> 
> 2. A potential buyer needs to see response curves for the various
> filters so he/she will know whether a given filter is likely 
> to solve a
> specific problem. For example, the reason we were talking about your
> products in the first place is that a ham posted to an RFI email list
> about a 50 kW station on 1540 kHz that he would like to clean out of
> his transceiver. What is the rejection of your filter(s) at 1540 kHz? 
> Is it likely to be enough to solve his problem, or does he need a more
> complex filter that has a steeper skirt on the low side of his
> passband? If I want to put one of your filters on an 80 m CW 
> station on
> Field Day, can I expect it to give me any rejection of the guy working
> 75 m phone? What about putting a filter on a beacon transmitter that
> might be at a commercial two-way site? And so on. 
> 
> Thanks,
> 
> Jim Brown K9YC
> 
> 
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>