If you look at the schematic and go to the audio gate on the radio and use that switching level to switch your transistor buffer you will have a solid COR and no loading. Been there....done that!
Gregg R. Lengling, W9DHI, Retired Administrator http://www.milwaukeehdtv.org K2/100 S#3075 KX1 S# 57 Politics is the art of appearing candid and completely open, while concealing as much as possible. -States: The Bene Gesserit View -----Original Message----- From: Dave [mailto:[EMAIL PROTECTED] Sent: Tuesday, March 30, 2004 6:22 PM To: [email protected] Subject: [Repeater-Builder] I need to buffer a squelch gate --- HELP! I use a couple of EF Johnson Challenger 71xx UHF mobile radios for the RX and TX side of one of my repeaters. Obviously there is no COR. A makeshift COR signal is the busy LED which works to a point. The busy LED lights up whenever there is ANY AND ALL signals on the frequency regardless of the PL tone. A static crash, the noise floor raising, a DX repeater, etc... it will trigger the transmit on the repeater, but the audio will not pass because that is filtered by the call guard (PL ). What I need to do is I need to grab the signal from the squelch gate trigger to make a true COR. However, directly taping to the trigger point with the controller loads down the whole thing and nothing is received. I've tried using a radio shack mps2222a transistor to make a transistor switch and still, it loads it down. I'm thinking now of using a quad buffer/line driver or something like that, but thats going to use a lot of space. I'd prefer to just use a transistor or something. Something that I can solder flat to the PC board and not have to run a pile of wires and add a circuit board. Does anyone have any ideas --- know of any transistors that could be used that will not load down the gate/squelch? I need something that is almost transparrent to the gate trigger. Thanks Dave N9NLU Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
