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Contesting Online Forums : Tips : Band Pass Filters Forums Help

1-6 of 6 messages

  Page 1 of 1  


Band Pass Filters Reply
by VE7JKZ on February 27, 2004 Mail this to a friend!
I'd like to build a band pass filter that will allow our 40m field day station to operate without being blasted out by the 20m station. Needs to handle 100 watts. Can anyone recommend a proven repeatable design?
Tnx, 73, Brian Summers VE7JKZ
 
RE: Band Pass Filters Reply
by NN0G on February 27, 2004 Mail this to a friend!
Good afternoon,
I use a shorted 23' RG-213 Stub to attenuate 10/20 at my SO2R station. I also use a 23' open stub to filter 15/40. They work pretty good is used together. My antennas are about 30' feet apart, and experience little if any interference.

Please take a look at this website for more information.
http://www.k1ttt.net/technote/k2trstub.html

73,
Dana
NN0G
 
RE: Band Pass Filters Reply
by PA1TX on February 28, 2004 Mail this to a friend!
Hi,

Please take a look at the W3NQN BP-filters
at the website of the BCC contestgroup.
http://www.bavarian-contest-club.de/projects/bandpassfilter/100W-BP.pdf


vy73's Gerard / PA1TX
 
RE: Band Pass Filters Reply
by g4fre on June 1, 2004 Mail this to a friend!
Does anyone know of a source of the t130-17 cores for the bcc design? Amidon say they havent had them for over 7 years

Dave

G4FRE

Hi,

Please take a look at the W3NQN BP-filters
at the website of the BCC contestgroup.
http://www.bavarian-contest-club.de/projects/bandpassfilter/100W-BP.pdf


vy73's Gerard / PA1TX
 
RE: Band Pass Filters Reply
by VE7JKZ on June 1, 2004 Mail this to a friend!
According to Amidon's January 2001 data sheet type 17 material has its highest Q from 50 to 200 Mhz. Seems an odd choice to use in a HF BPF. It is (was?) only available in sizes T-12 through T-50 material. I wonder if the info on the bcc website is correct?
 
RE: Band Pass Filters Reply
by g4fre on June 2, 2004 Mail this to a friend!
I had the same thoughts about these cores being vhf having seen the amidon data sheet...but the pictures in the writeup show the correct colour (blue&yellow)!

Dave
 

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