At 09:29 AM 03/27/07, you wrote: >We have a 440 repeater with a Six meter remote base setup. On the >Six meter receiver we constantly get little "pops" that key up the >repeater and is quite anoying. The "Pops" are created by very close >TV station transmitters at the site and appear to be on channel so >filtering is not an option. Our controller does not have a >antikerchunker circuit for this second port. > >I wonder if anyone has a QUICK and SIMPLE circuit for a delayed >keying of the conttoller on the COS line? I believe something on the >order of 1/4 to 1/2 second would be sufficient in our case. > >If the receiver COS line keys up, it would not be seen by the >controller until the predetermined delay time from this little magic >circuit. > >Anyone out there have any ideas on this????? > >GARY - W5GNB
Which controller is it? If it's one of the ones from ICS you need to contact Brian as he added the kerchunk filter to port two a while back. Years ago I helped a 6m group that had an intermittently pulsing interference on their input - it took a year of T-Hunting to find it as the interference was only for a couple of hours per week, and usually the guys were at work when it happened... turned out to be a dirty industrial RF-based plastic bag sealer a few miles from the receive site. We did a perfboard circuit with a 555 and a few transistors... COR went into it, it fed the COR line on the controller. When PTT came up it switched the circuit into normal mode. The problem was that the "pops" would keep it in normal mode. We never did come up with a resolution to that problem... In the end we PL'd the input until the sealer was found and repaired. Mike WA6ILQ
