Hi all thanks for all information. My antennas are very simple homemade indoor yagis (2 x 12 X on 70cms) and (1 x 6 X on 2mtrs) the coax is LDF4-50 from just behind the radios to the rotator in the loft. The radios are about 30cms apart (1ft) and I wonder if I was to join both the outers together of the coaxes (an electrical bond) would this make any difference or would this create any more problems? I am just wondering this as my array is slightly different to others having PVC pipe booms and being indoors with no connectivity between antennas and radios for different bands? regards Gus ----- Original Message ----- From: Floyd Rodgers To: Angus Sent: Thursday, January 22, 2009 5:14 PM Subject: Re: re 2 metre de-sensing

When using some other rigs, like ft847, others have suggested using a 2m/440 duplexer, since the 847 has separate ports. Others using different radios also suggest using the duplexer as a notch filter. Simply terminate the unused output port 2m or 70cm with a 50 ohm restor and waether cap. Does this make sense?

------------------------------------------------------------------------------ From: Angus angus@young5769.freeserve.co.uk To: AMSAT-BB@amsat.org Sent: Thursday, January 22, 2009 5:51:36 AM Subject: [amsat-bb] re 2 metre de-sensing

Hi, thanks for all helpful advice on antenna separation etc. but I have a problem with my FT817 on 70cms (5 watts) de-sensing my FT-480r on 2 meters. I have managed to stop the 2 meter transmission blocking the 70cms reception but I find that with even 5 watts on 70cms this is still de-sensing the 2-meter radio, any ideas, or links to some good band pass filters (low pass or high pass that you may think will work?) regards Gus M0IKB

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